Hybrid/ev Energy Storage System Cadillac ELR I

Fastener Tightening Specifications

Fastener Tightening Specifications

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

Scheme 56

Scheme 57

Scheme 58

Scheme 59

Scheme 60

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit/System Description

The High Voltage Safety procedure will perform the following tasks

1. Identify precautions when performing service or inspections.
2. Identify labels for components, wire harness, and connectors.
3. Identify high voltage insulation glove inspection procedure.

Reference Information

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

Precautions when Performing Service or Inspections

1. Always verify that the high voltage has been disabled before working on or around high voltage components, wires, cables, or harnesses.
2. Remove all metal objects such as rings and watches.
3. The EL-48900 HEV safety kit contains safety cones. Place the safety cones around the vehicle to alert other technicians that you are working on the high voltage system.
4. Remove all keyless entry transmitters and the manual service disconnect from the vehicle and secure in a place outside the vehicle.
5. Always wear certified and tested high voltage insulation gloves when inspecting or testing any high voltage wires and components.
6. Use the "One Hand" rule: Work with only one hand whenever possible. Keep the other hand behind your back.
7. DO NOT carry any metal objects such as a mechanical pencil or a measuring tape that could fall and cause a short circuit.
8. After removing any high voltage wires, protect and insulate the terminal ends immediately with the EL-50209 high voltage terminal cover and UL® Listed or equivalent insulation tape rated at a minimum of 600 V.
9. Always tighten the high voltage terminal fasteners to the specified torque. Insufficient or excessive torque will cause malfunctions or damage.
10. After finishing work on the high voltage systems and before reinstalling the high voltage manual disconnect, inspect for the following: Verify high voltage system integrity and that all connectors are installed. Verify that all tools or loose components have been removed.

Labels for Components, Wire Harness, and Connectors

The wire harnesses and cables for high voltage circuits are encased in an orange colored covering. In addition, high voltage components such as the Energy Storage System and high voltage cables are affixed with "High Voltage" red danger and orange warning labels.

Scheme 61

The following procedure visually and functionally inspects the insulation gloves to be used while performing service on high voltage systems. This inspection procedure should be performed prior to any procedure that requires the use of class "0" insulation gloves rated at 1000 V.

1. Remove glove from leather protector.
2. Inflate glove and seal opening. Pinch the opening closed tightly to prevent any air loss.
3. Press glove to increase pressure.
4. Inspect for the following conditions: Pin holes Air leaks Wear, tears, or abrasions Damp or wet material Expired certification If any of the above conditions are met Do not use the gloves. If none of the above conditions are met
5. All OK. Gloves are OK to use.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The High Voltage Disabling procedure will perform the following tasks

1. Identify how to disable high voltage.
2. Identify how to test for the presence of high voltage.
3. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. EL-48900 HEV Safety Kit
2. EL-50554-1 14 V Power Inverter Assurance Harness
3. EL-50554-2 Charger Assurance Harness

For equivalent regional tools, refer to Special Tools .

Servicing the A4 Hybrid/EV Battery Pack, 360 V DC Cables and General Vehicle Servicing

1. Review the high voltage safety information. Refer to «High Voltage Safety»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. Disconnect and remove all 12 V Battery Chargers and the AC Charge Cable from the X98 Hybrid Battery Charger Receptacle.
3. Remove all keyless entry transmitters from the vehicle and secure in a place outside the vehicle.
4. Attempt to start the vehicle with the Ignition Mode Switch. If the vehicle enters Propulsion System Active mode or the engine starts Locate and remove all keyless entry transmitters from within the vehicle and return to step 3. If the vehicle did not enter Propulsion System Active mode and the engine did not start
5. Disconnect the 12 V battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/elr/i-2013-2015/remont/body-electrical/#battery-charging-system-and-starting-system)
6. Remove the S15 Manual Service Disconnect (1). Refer to «Drive Motor Battery High Voltage Manual Disconnect Lever Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-high-voltage-manual) . Place the S15 Manual Service Disconnect in a secure place outside the vehicle. Cover the exposed high voltage opening with UL® listed, or equivalent, insulation tape rated at a minimum of 600 V.
7. Wait 5 min before continuing, to allow the high voltage capacitors to discharge.
8. Verify the EL-50554 voltage disable assurance test harness , EL-50554-1 and EL-50554-2 cables, measure less than 1 ohms at the following points: High voltage DC (-360 V) negative terminal B to the High voltage DC (-360 V) negative terminal. High voltage DC (+360 V) positive terminal A to the High voltage DC (+360 V) positive terminal. If 1 ohms or greater Repair or replace the EL-50554-1 or EL-50554-2 and repeat all measurements. If less than 1 ohms
9. Verify the EL-50554-1 and EL-50554-2 have infinite resistance between the High voltage DC (+360 V) positive terminal A to High voltage DC (-360 V) negative terminal B. If less than infinite resistance Repair or replace the EL-50554-1 or EL-50554-2 and repeat all measurements. If infinite resistance
10. Verify the EL-50554-1 and EL-50554-2 High voltage DC (-360 V) negative terminal B and the High voltage DC (+360 V) positive terminal A have the proper terminal tension. Refer to Testing for Proper Terminal Contact. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) If a poor connection is found Repair or replace the EL-50554-1 or EL-50554-2 and repeat all measurements. If the connections have the proper terminal tension
11. Remove the T6 Power Inverter Module cover. Refer to «Drive Motor Generator Power Inverter Module Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-control-system) .
12. Verify the test DMM by measuring a 12 V battery. If the DMM does not properly measure a 12 V battery Repair or replace the DMM and repeat all voltage measurements. If the DMM properly measures a 12 V battery
13. Disconnect the X3 (1) harness connector at the T6 Power Inverter Module.
14. Verify the voltage measures less than 3 V at the T6 Power Inverter Module at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
15. Verify the voltage measures less than 3 V at the X3 harness connector at the T6 Power Inverter Module at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater There is a stuck closed contactor and a loss of isolation within the A4 Battery Pack Assembly. Refer to «Hybrid\EV Battery Voltage Present»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) If less than 3 V
16. Remove the 3 catalytic converter nuts. Disconnect catalytic converter from the exhaust manifold. Move and secure the exhaust to one side. Refer to «Catalytic Converter Replacement»(/cadillac/elr/i-2013-2015/remont/exhaust/#engine-exhaust-system)
17. Disconnect the Heated Oxygen Sensor 2. Refer to «Heated Oxygen Sensor Replacement - Sensor 2»(/cadillac/elr/i-2013-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luu-repair-instructions)
18. Remove the front exhaust pipe heat shield. Refer to «Exhaust Pipe Heat Shield Replacement (Front)»(/cadillac/elr/i-2013-2015/remont/exhaust/#engine-exhaust-system)
19. Disconnect the X1 (1) and X2 (2) harness connectors at the A4 Battery Pack Assembly.
20. Disconnect the high voltage interlock harness connector listed below at the A4 Battery Pack Assembly. F118 (6) hybrid battery pack connector jumper connector. X6 (7) 14 V power module jumper connector. X7 (8) battery charger jumper connector.
21. Disconnect the X4 (4) harness connector at the A4 Battery Pack Assembly. Connect the EL-50554-1 to the A4 Battery Pack Assembly.
22. Verify the voltage measures less than 3 V at the EL-50554-1 at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater There is a stuck closed contactor and a loss of isolation within the A4 Battery Pack Assembly. Refer to «Hybrid\EV Battery Voltage Present»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) If less than 3 V
23. Verify the voltage measures less than 3 V at the X4 harness connector at the A4 Battery Pack Assembly at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
24. Disconnect the X5 (5) harness connector at the A4 Battery Pack Assembly. Connect the EL-50554-2 to the A4 Battery Pack Assembly.
25. Verify the voltage measures less than 3 V at the EL-50554-2 at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater There is a stuck closed contactor and a loss of isolation within the A4 Battery Pack Assembly. Refer to «Hybrid\EV Battery Voltage Present»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) If less than 3 V
26. Verify the voltage measures less than 3 V at the X5 harness connector at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
27. Disconnect the X3 (3) harness connector at the A4 Battery Pack Assembly.
28. Verify the voltage measures less than 3 V at the A4 Battery Pack Assembly at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater There is a stuck closed contactor and a loss of isolation within the A4 Battery Pack Assembly. Refer to «Hybrid\EV Battery Voltage Present»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) If less than 3 V
29. Verify the test DMM by measuring a 12 V battery. If the DMM does not properly measure a 12 V battery Repair or replace the DMM and repeat all voltage measurements. If the DMM properly measures a 12 V battery
30. All OK. The A4 Battery Pack Assembly, 360 V DC power inverter cables or general vehicle can now be serviced.

Servicing the T6 Power Inverter Module Assembly or T12 Transmission

1. Review the high voltage safety information. Refer to «High Voltage Safety»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. Disconnect and remove all 12 V Battery Chargers and the AC Charge Cable from the X98 Hybrid Battery Charger Receptacle.
3. Remove all keyless entry transmitters from the vehicle and secure in a place outside the vehicle.
4. Attempt to start the vehicle with the Ignition Mode Switch. If the vehicle enters Propulsion System Active mode or the engine starts Locate and remove all keyless entry transmitters from within the vehicle and return to step 3. If the vehicle did not enter Propulsion System Active mode and the engine did not start
5. Disconnect the 12 V battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/elr/i-2013-2015/remont/body-electrical/#battery-charging-system-and-starting-system)
6. Remove the S15 Manual Service Disconnect (1). Refer to «Drive Motor Battery High Voltage Manual Disconnect Lever Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-high-voltage-manual) . Place the S15 Manual Service Disconnect in a secure place outside the vehicle. Cover the exposed high voltage opening with UL® listed, or equivalent, insulation tape rated at a minimum of 600 V.
7. Wait 5 min before continuing, to allow the high voltage capacitors to discharge.
8. Remove the T6 Power Inverter Module cover. Refer to «Drive Motor Generator Power Inverter Module Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-control-system) .
9. Verify the test DMM by measuring a 12 V battery. If the DMM does not properly measure a 12 V battery Repair or replace the DMM and repeat all voltage measurements. If the DMM properly measures a 12 V battery
10. Disconnect the X3 (1) harness connector at the T6 Power Inverter Module.
11. Verify the voltage measures less than 3 V at the T6 Power Inverter Module at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
12. Verify the voltage measures less than 3 V at the X3 harness connector at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater There is a stuck closed contactor and a loss of isolation within the A4 Battery Pack Assembly. Refer to «Hybrid\EV Battery Voltage Present»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) If less than 3 V
13. Disconnect the X4 (1) harness connector at the T6 Power Inverter Module.
14. Verify the voltage measures less than 3 V at the T6 Power Inverter Module at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
15. Verify the voltage measures less than 3 V at the X4 harness connector at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
16. Verify the test DMM by measuring a 12 V battery. If the DMM does not properly measure a 12 V battery Repair or replace the DMM and repeat all voltage measurements. If the DMM properly measures a 12 V battery
17. All OK. The T6 Power Inverter Module assembly or T12 Transmission can now be serviced.

Servicing the K1 14 V Accessory Power Module

1. Review the high voltage safety information. Refer to «High Voltage Safety»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. Disconnect and remove all 12 V Battery Chargers and the AC Charge Cable from the X98 Hybrid Battery Charger Receptacle.
3. Remove all keyless entry transmitters from the vehicle and secure in a place outside the vehicle.
4. Attempt to start the vehicle with the Ignition Mode Switch. If the vehicle enters Propulsion System Active mode or the engine starts Locate and remove all keyless entry transmitters from within the vehicle and return to step 3. If the vehicle did not enter Propulsion System Active mode and the engine did not start
5. Disconnect the 12 V battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/elr/i-2013-2015/remont/body-electrical/#battery-charging-system-and-starting-system)
6. Remove the S15 Manual Service Disconnect (1). Refer to «Drive Motor Battery High Voltage Manual Disconnect Lever Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-high-voltage-manual) . Place the S15 Manual Service Disconnect in a secure place outside the vehicle. Cover the exposed high voltage opening with UL® listed, or equivalent, insulation tape rated at a minimum of 600 V.
7. Wait 5 min before continuing, to allow the high voltage capacitors to discharge.
8. Verify the test DMM by measuring a 12 V battery. If the DMM does not properly measure a 12 V battery Repair or replace the DMM and repeat all voltage measurements. If the DMM properly measures a 12 V battery
9. Disconnect the X1 harness connector at the K1 14 V Accessory Power Module.
10. Verify the voltage measures less than 3 V at the K1 14 V Accessory Power Module at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
11. Verify the voltage measures less than 3 V at the X1 harness connector at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater There is a stuck closed contactor and a loss of isolation within the A4 Battery Pack Assembly. Refer to «Hybrid\EV Battery Voltage Present»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) If less than 3 V
12. Verify the test DMM by measuring a 12 V battery. If the DMM does not properly measure a 12 V battery Repair or replace the DMM and repeat all voltage measurements. If the DMM properly measures a 12 V battery
13. All OK. The K1 14 V Accessory Power Module can now be serviced.

Servicing the T18 Battery Charger or X98 Hybrid/EV Battery Charger Receptacle

1. Review the high voltage safety information. Refer to «High Voltage Safety»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. Disconnect and remove all 12 V Battery Chargers and the AC Charge Cable from the X98 Hybrid Battery Charger Receptacle.
3. Remove all keyless entry transmitters from the vehicle and secure in a place outside the vehicle.
4. Attempt to start the vehicle with the Ignition Mode Switch. If the vehicle enters Propulsion System Active mode or the engine starts Locate and remove all keyless entry transmitters from within the vehicle and return to step 3. If the vehicle did not enter Propulsion System Active mode and the engine did not start
5. Disconnect the 12 V battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/elr/i-2013-2015/remont/body-electrical/#battery-charging-system-and-starting-system)
6. Remove the S15 Manual Service Disconnect (1). Refer to «Drive Motor Battery High Voltage Manual Disconnect Lever Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-high-voltage-manual) . Place the S15 Manual Service Disconnect in a secure place outside the vehicle. Cover the exposed high voltage opening with UL® listed, or equivalent, insulation tape rated at a minimum of 600 V.
7. Wait 5 min before continuing, to allow the high voltage capacitors to discharge.
8. Remove the front wheelhouse front liner.
9. Verify the test DMM by measuring a 12 V battery. If the DMM does not properly measure a 12 V battery Repair or replace the DMM and repeat all voltage measurements. If the DMM properly measures a 12 V battery
10. Disconnect the X4 harness connector at the T18 Battery Charger.
11. Verify the voltage measures less than 3 V at the T18 Battery Charger at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
12. Verify the voltage measures less than 3 V at the X4 harness connector at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater There is a stuck closed contactor and a loss of isolation within the A4 Battery Pack Assembly. Refer to «Hybrid\EV Battery Voltage Present»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) If less than 3 V
13. Disconnect the X3 harness connector at the T18 Battery Charger.
14. Verify the voltage measures less than 3 V at the T18 Battery Charger at the following points: High voltage AC (-120/240 V) negative terminal B to vehicle chassis ground. High voltage AC (+120/240 V) positive terminal A to vehicle chassis ground. High voltage AC (+120/240 V) neutral terminal C to vehicle chassis ground. High voltage AC (+120/240 V) positive terminal A and high voltage AC (-120/240 V) negative terminal B. High voltage AC (+120/240 V) positive terminal A and high voltage AC neutral terminal C. High voltage AC (+120/240 V) positive terminal B and high voltage AC neutral terminal C. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
15. Verify the test DMM by measuring a 12 V battery. If the DMM does not properly measure a 12 V battery Repair or replace the DMM and repeat all voltage measurements. If the DMM properly measures a 12 V battery
16. All OK. The T18 Battery Charger control module or X98 Hybrid Battery Charger Receptacle can now be serviced.

Servicing the G1 Air Conditioning Compressor

1. Review the high voltage safety information. Refer to «High Voltage Safety»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. Disconnect and remove all 12 V Battery Chargers and the AC Charge Cable from the X98 Hybrid Battery Charger Receptacle.
3. Remove all keyless entry transmitters from the vehicle and secure in a place outside the vehicle.
4. Attempt to start the vehicle with the Ignition Mode Switch. If the vehicle enters Propulsion System Active mode or the engine starts Locate and remove all keyless entry transmitters from within the vehicle and return to step 3. If the vehicle did not enter Propulsion System Active mode and the engine did not start
5. Disconnect the 12 V battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/elr/i-2013-2015/remont/body-electrical/#battery-charging-system-and-starting-system)
6. Remove the S15 Manual Service Disconnect (1). Refer to «Drive Motor Battery High Voltage Manual Disconnect Lever Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-high-voltage-manual) . Place the S15 Manual Service Disconnect in a secure place outside the vehicle. Cover the exposed high voltage opening with UL® listed, or equivalent, insulation tape rated at a minimum of 600 V.
7. Wait 5 min before continuing, to allow the high voltage capacitors to discharge.
8. Remove the T6 Power Inverter Module cover. Refer to «Drive Motor Generator Power Inverter Module Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-control-system) .
9. Verify the test DMM by measuring a 12 V battery. If the DMM does not properly measure a 12 V battery Repair or replace the DMM and repeat all voltage measurements. If the DMM properly measures a 12 V battery
10. Disconnect the X3 (1) harness connector at the T6 Power Inverter Module.
11. Verify the voltage measures less than 3 V at the T6 Power Inverter Module at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
12. Verify the voltage measures less than 3 V at the X3 harness connector at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater There is a stuck closed contactor and a loss of isolation within the A4 Battery Pack Assembly. Refer to «Hybrid\EV Battery Voltage Present»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) If less than 3 V
13. Disconnect the X4 (1) harness connector at the T6 Power Inverter Module.
14. Verify the voltage measures less than 3 V at the T6 Power Inverter Module at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
15. Verify the voltage measures less than 3 V at the X4 harness connector at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
16. Disconnect the X2 harness connector at the G1 Air Conditioning Compressor.
17. Verify the voltage measures less than 3 V at the G1 Air Conditioning Compressor at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
18. Verify the test DMM by measuring a 12 V battery. If the DMM does not properly measure a 12 V battery Repair or replace the DMM and repeat all voltage measurements. If the DMM properly measures a 12 V battery
19. All OK. The G1 Air Conditioning Compressor can now be serviced.

Servicing the K10 Coolant Heater Control Module

1. Review the high voltage safety information. Refer to «High Voltage Safety»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. Disconnect and remove all 12 V Battery Chargers and the AC Charge Cable from the X98 Hybrid Battery Charger Receptacle.
3. Remove all keyless entry transmitters from the vehicle and secure in a place outside the vehicle.
4. Attempt to start the vehicle with the Ignition Mode Switch. If the vehicle enters Propulsion System Active mode or the engine starts Locate and remove all keyless entry transmitters from within the vehicle and return to step 3. If the vehicle did not enter Propulsion System Active mode and the engine did not start
5. Disconnect the 12 V battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/elr/i-2013-2015/remont/body-electrical/#battery-charging-system-and-starting-system)
6. Remove the S15 Manual Service Disconnect (1). Refer to «Drive Motor Battery High Voltage Manual Disconnect Lever Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-high-voltage-manual) . Place the S15 Manual Service Disconnect in a secure place outside the vehicle. Cover the exposed high voltage opening with UL® listed, or equivalent, insulation tape rated at a minimum of 600 V.
7. Wait 5 min before continuing, to allow the high voltage capacitors to discharge.
8. Remove the traction Power Inverter Module cover. Refer to «Drive Motor Generator Power Inverter Module Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-control-system) .
9. Verify the test DMM by measuring a 12 V battery. If the DMM does not properly measure a 12 V battery Repair or replace the DMM and repeat all voltage measurements. If the DMM properly measures a 12 V battery
10. Disconnect the X3 (1) harness connector at the T6 Power Inverter Module.
11. Verify the voltage measures less than 3 V at the T6 Power Inverter Module at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
12. Verify the voltage measures less than 3 V at the X3 harness connector at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater There is a stuck closed contactor and a loss of isolation within the A4 Battery Pack Assembly. Refer to «Hybrid\EV Battery Voltage Present»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) If less than 3 V
13. Disconnect the X4 (1) harness connector at the T6 Power Inverter Module.
14. Verify that the voltage has been disabled at the T6 Power Inverter Module. Using the DMM, verify the voltage measures less than 3 V at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
15. Verify the voltage measures less than 3 V at the X4 harness connector at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
16. Disconnect the X2 harness connector at the K10 Coolant Heater Control Module.
17. Verify that the voltage has been disabled at the K10 Coolant Heater Control Module. Using the DMM, verify the voltage measures less than 3 V at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
18. Verify the test DMM by measuring a 12 V battery. If the DMM does not properly measure a 12 V battery Repair or replace the DMM and repeat all voltage measurements. If the DMM properly measures a 12 V battery
19. All OK. The K10 Coolant Heater Control Module can now be serviced.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The High Voltage Enabling procedure will perform the following tasks

1. Identify how to enable high voltage.
2. Verify high voltage system integrity and that all connectors are installed.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Review the high voltage safety information prior to performing the High Voltage Enabling procedure. Refer to «High Voltage Safety»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. Ensure that the 12 V battery is disconnected. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/elr/i-2013-2015/remont/body-electrical/#battery-charging-system-and-starting-system)
3. After finishing work on the high voltage systems and before installing the S15 Manual Service Disconnect, inspect for the following: Verify that all tools or loose components have been removed. Inspect any disconnected 300 V Battery Positive and Negative cable seals for being deformed, missing, or damaged. Replace any seals that are deformed, missing, or damaged. Verify high voltage system integrity and that all connectors are installed. Verify that all high voltage interlock circuit connectors and covers are installed. Install any components or connectors that have been removed or replaced during diagnosis.
4. Install the S15 Manual Service Disconnect (1). Refer to «Drive Motor Battery High Voltage Manual Disconnect Lever Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-high-voltage-manual)
5. Connect the 12 V battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/elr/i-2013-2015/remont/body-electrical/#battery-charging-system-and-starting-system) . Vehicle in Service Mode.
6. Verify if the A4 Hybrid/EV Battery Pack, K16 Battery Energy Control Module, or any of the Hybrid/EV Battery Interface Control Modules have been replaced. If the A4 Hybrid/EV Battery Pack, K16 Battery Energy Control Module, or any of the Hybrid/EV Battery Interface Control Modules have been replaced Program the K16 Battery Energy Control Module and the Hybrid/EV Battery Interface Control Modules. Refer to «Battery Energy Control Module Programming and Setup»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__battery-energy-control-module-programming-and) . Continue to the next step once programming is complete. If the A4 Hybrid/EV Battery Pack, K16 Battery Energy Control Module, or any of the Hybrid/EV Battery Interface Control Modules have not been replaced
7. With the hood open, start the engine. Vehicle OFF.
8. Vehicle in Service Mode, perform the driver window express learn and clear all DTC Information with a scan tool. Refer to «Window Motor Programming - Express Function»(/cadillac/elr/i-2013-2015/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)
9. Vehicle OFF and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down. Vehicle in Service Mode.
10. Verify with a scan tool no DTCs are set. If any DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If no DTCs are set
11. Start and idle the engine for 2 min.
12. Vehicle OFF and wait 5 min. Vehicle in Service Mode.
13. Verify with the scan tool the T6 Power Inverter Module and K114B Hybrid/EV Powertrain Control Module 2 DTC Information that the following DTCs have Ran Since Code Clear and have not set: Motor position sensor learn DTCs P0C17 and P0C18. Contactor DTCs P0AD9, P0ADD, P0D0A, P0D11, P0AE4, and P1EBC. Discharge and Pre-charge DTCs P0C76, P0C77, P0C78 and P0AFB. High voltage loss of isolation DTCs P0AA6, P1AE6 and P1F0E. If any DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If the DTCs have Not Ran Since Code Clear Review and operate the vehicle according to the applicable DTC Conditions for Running and ensure the DTCs run and pass. Verify with the scan tool the T6 Power Inverter Module and K114B Hybrid/EV Powertrain Control Module 2 DTC Information that the following DTCs have Ran Since Code Clear and have not set: If any DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If the DTCs have Ran and Passed Test drive the vehicle and verify no DTCs are set. If the DTCs have Ran and Passed
14. Test drive the vehicle and verify no DTCs are set.

EL-48571 High Voltage Battery Pin Out Box Reference

EL-48571 High Voltage Battery Pin Out Box Reference

EL-48571 High Voltage Battery Pin Out Box Reference

EL-48571 High Voltage Battery Pin Out Box Reference

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The main high voltage interlock circuit is utilized to verify high voltage component integrity. The main high voltage interlock circuit is used to determine if access to high voltage components is being attempted. The opening of these high voltage components causes the main high voltage interlock circuit to open. The hybrid/EV powertrain control module 2 sources about 12 mA of current on the 5 V main high voltage interlock circuit loop. The hybrid/EV powertrain control module 2 monitors both the main high voltage interlock 5 V reference circuit current and the main high voltage interlock signal circuit current in order to detect circuit faults. When the hybrid/EV powertrain control module 2 detects a loss of main high voltage interlock circuit current, the high voltage contactors are commanded open.

Conditions for Running the DTC

P0A0C

1. The 12 V battery voltage is greater than 9 V.
2. The high voltage contactors are closed.

P0A0D

1. The 12 V battery voltage is greater than 9 V.
2. The hybrid/EV powertrain control module 2 is awake and communicating.

Conditions for Setting the DTC

P0A0C

1. The hybrid/EV powertrain control module 2 detects main high voltage interlock circuit 5 V reference current is between 5-18 mA and high voltage interlock circuit signal current is less than 5 mA.
2. DTC P0A0C sets within 1 second when the above condition is met.

P0A0D

1. The hybrid/EV powertrain control module 2 detects main high voltage interlock circuit 5 V reference current is less than 5 mA and high voltage interlock circuit signal current is greater than 35 mA.
2. DTC P0A0D sets within 1 second when the above condition is met.

Action Taken When the DTC Sets

1. DTCs P0A0C and P0A0D are Type A DTCs.
2. The hybrid/EV powertrain control module 2 opens the main high voltage contactors when vehicle speed is less than 5 km/h (3 mph).

Conditions for Clearing the DTC

DTCs P0A0C and P0A0D are Type A DTCs.

Diagnostic Aids

1. Test for a fully engaged hybrid battery pack high voltage manual disconnect whenever an open high voltage interlock circuit condition is observed. The hybrid battery pack high voltage manual disconnect must be pressed down fully in order to engage the high voltage interlock circuit terminals.
2. The main high voltage interlock circuit is also routed through several inline connectors.
3. With the Vehicle OFF, the hybrid/EV powertrain control module 2 will source 12 mA on the main high voltage interlock circuit for 5 min every time a vehicle door is opened.
4. Tapping or wiggling the F115 Hybrid/EV Battery Pack Fuse Cover may duplicate the condition.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

Circuit/System Verification

1. Vehicle in Service Mode.
2. With a scan tool, observe the hybrid/EV powertrain control module 2 High Voltage Interlock Circuit Status parameter. The parameter indicates a FAIL condition. Refer to Circuit/System Testing The parameter indicates a PASS condition.
3. All OK.

1. Vehicle OFF, disconnect the X1 connector at the K114B Hybrid/EV Powertrain Control Module 2.
2. Test for infinite resistance between the 5 V reference circuit terminal 47 and ground. If less than infinite resistance Disconnect the S15 Manual Service Disconnect. Test for infinite resistance between the 5 V reference circuit terminal 47 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for infinite resistance between the signal circuit terminal 45 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for 35-45 ohms between the following terminals of the S15 Manual Service Disconnect: Terminal 1 and terminal 2 Terminal 3 and terminal 4 If not within the specified range, replace the S15 Manual Service Disconnect. If within the specified range, replace the A4 Battery Pack Assembly. If infinite resistance
3. Test for less than 50 ohms between the 5 V reference circuit terminal 47 and the signal circuit terminal 45. If 50 ohms greater Disconnect the S15 Manual Service Disconnect. Test for 35-45 ohms between the following terminals of the S15 Manual Service Disconnect: Terminal 1 and terminal 2 Terminal 3 and terminal 4 If not within the specified range, replace the S15 Manual Service Disconnect. If within the specified range Test for less than 2 ohms in the 5 V reference circuit terminal 47 end to end. If 2 ohms or greater, repair the open/high resistance on the circuit. If less than 2 ohms Test for less than 2 ohms in the signal circuit terminal 45 end to end. If 2 ohms or greater, repair the open/high resistance on the circuit. If less than 2 ohms, replace the A4 Battery Pack Assembly. If less than 50 ohms
4. Vehicle in Service Mode.
5. Test for less than 1 V in the signal circuit terminal 47 and ground. If 1 V or greater Vehicle OFF, disconnect the X6 connector at the A4 Battery Pack Assembly. Vehicle in Service Mode. Test for less than 1 V in the signal circuit terminal 47 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 1 V in the signal circuit terminal 45 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the A4 Battery Pack Assembly. If less than 1 V
6. Replace the K114B Hybrid/EV Powertrain Control Module 2.

Component Testing

1. Disconnect the S15 Manual Service Disconnect.
2. Test for 35-45 ohms between the following terminals of the S15 Manual Service Disconnect: Terminal 1 and terminal 2 Terminal 3 and terminal 4 If not within the specified range Replace the S15 Manual Service Disconnect. If within the specified range
3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

1. «Drive Motor Battery High Voltage Manual Disconnect Lever Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-high-voltage-manual)
2. «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping)
3. «Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid/EV powertrain control module 2 replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV powertrain control module 2 calculates the high voltage battery pack capability and determines the high voltage battery pack end of life.

1. Vehicle ON.
2. The system voltage is at least 10.2 V.
3. Hybrid battery temperature is greater than 0° C (32° F).
4. Hybrid battery temperature is less than 40° C (104° F).
5. Hybrid battery state of charge is between 10.8 % and 99 %.
6. When the hybrid/EV powertrain control module 2 calculates the actual battery power has exceeded the power limits multiplied by seconds of duration is greater than 50 %.
7. None of the following DTCs are set: P0A9C, P0A9D, P0A9E, P0ABB, P0ABC, P0ABD, P0AC1, P0AC2, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEA, P0AEB, P0AF8, P0BC3, P0BC4, P0BC5, P0C34, P0C35, P0C36, P0C7D, P0C7E, P0C7F, P0C82, P0C83, P0C84, P0C89, P0C8A, P0C8B, P0C8E, P0C8F, P0C90, P0C93, P0C94, P0C95, P0C98, P0C99, P0C9A, P0CA9, P0CAA, P0CAB, P0CAE, P0CAF, P0CB0, P0CB3, P0CB4, P0CB5, P0CB8, P0CB9, P0CBA, P1A07, P1E8E, P1E8F, P1E90, P1E91, P1E93, P1E94, P1E95, P1E96, P1E97, P1E99, P1E9A, P1E9B, P1E9C, P1E9D, P1E9F, P1EA0, P1EA1, P1EA2, P1EA3, P1EA5, P1EB1, P1EB2, P1EB3, P1EB4, P1EB5, P1EBA, P1EBB, U0111, U185A, U2401, U2603, U2604, U2605, or U2606.

1. Battery voltage and current is varying. Requires more than 10 minutes of city driving.
2. When the hybrid/EV powertrain control module 2 calculates the power limits is less than the KW end of life power threshold.

DTC P0A7F is a type B DTC.

DTC P0A7F is a type B DTC.

Removing the manual service disconnect before disconnecting the 12 V battery may cause a DTC P0A7F to set.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

1. Verify that no other DTCs are set. If any other DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) No other DTCs are set
2. Verify DTC P0A7F is set. If DTC P0A7F is set Clear the DTC. Vehicle OFF, disconnect the 12 V battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/elr/i-2013-2015/remont/body-electrical/#battery-charging-system-and-starting-system) Wait 30 seconds. Reconnect the 12 V battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/elr/i-2013-2015/remont/body-electrical/#battery-charging-system-and-starting-system) Review and operate the vehicle according to the DTC Conditions for Running. Operate the vehicle for more than 10 minutes of city driving. Verify that DTC P0A7F does not reset. If DTC P0A7F resets, replace the A4 hybrid/EV battery pack. If DTC P0A7F does not reset All OK. If DTC P0A7F is not set
3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping)
2. «Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery energy control module and hybrid battery interface control modules replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

The hybrid/EV battery contains 5 high voltage contactors and 2 transistors. The high voltage contactors and transistors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the hybrid/EV battery assembly. The 5 high voltage contactors consist of a main positive high voltage contactor, main negative high voltage contactor, charge positive high voltage contactor, charge negative high voltage contactor, and multi-function high voltage contactor. The 2 transistors consist of the precharge transistor and heater transistor. The contactors and transistors close and open in a specific sequence controlled by the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 supplies voltage to the control circuit for the high voltage contactors/transistors. Ground is provided through the case ground.

P0AA1

1. Is run once during a precharge event.
2. The 12 V battery voltage is greater than 9 V.
3. The main negative contactor is closed.
4. The bus voltage reading at the hybrid/EV powertrain control module 2 is less than 15% of battery voltage before the negative contactor closes.
5. None of the following DTCs are set; P0ABC, P0ABD, P1A07, P0ABB, P0AF8, P1AE8, P1AE9, or P1AEC

P0AD9, P0ADD, P0AE4, P0D0A, P0D11, and P1EBC

The 12 V battery voltage is greater than 10 V.

P0AE2

1. During precharge mode.
2. The multifunction contactor and negative contactor are closed.
3. None of the following DTCs are set; P0AA1, P0ABC, P0ABD, P1A07, P0ABB, P0AF8, P1AE8, P1AE9, or P1AEC

P1EBD or P1EBE

1. Runs once at the beginning of each charge cycle.
2. The 12 V battery voltage is greater than 9 V.
3. The vehicle is in charge mode.
4. Charge mode is not in heat only mode.
5. The heater transistor is commanded on for 2 seconds.
6. None of the following DTCs are set; P0AC1, P0AC2, P0B10, P0B11, P0B13, P0D53, P0D54, P1EBA, or P1EBB.

P1EBF

CHARGE MODE

1. Runs once during charger precharge.
2. The 12 V battery voltage is greater than 9 V.
3. The battery charger negative and positive contactors are closed.
4. None of the following DTCs are set; P0AC1, P0AC2, P0B10, P0B11, P0B13, P0D53, P0D54, P1EBA, or P1EBB. OR

BATTERY HEATING ONLY MODE

1. The 12 V battery voltage is greater than 9 V.
2. The battery charger is in heating only mode.
3. Battery current is greater than 1 A .
4. None of the following DTCs are set; P0AC1, P0AC2, P0B10, P0B11, P0B13, P0D53, P0D54, P1EBA, or P1EBB.

P1EC0

1. The 12 V battery voltage is greater than 9 V.
2. The main positive and negative contactors are closed for more than 1 second.
3. None of the following DTCs are set; P1AE8, P1AE9, or P1AEC.

P1EC3

1. The hybrid/EV powertrain control module is awake and communicating.
2. The 12 V battery voltage is greater than 9 V.

P1EC4

1. Runs once at the beginning of each charge cycle.
2. The 12 V battery voltage is greater than 9 V.
3. The vehicle is in charge mode.
4. Charge mode is not in heat only mode.
5. None of the following DTCs are set; P0AC1, P0AC2, P0B10, P0B11, P0B13, P0D53, P0D54, P1EBA, or P1EBB.

P1EC5

1. The 12 V battery voltage is greater than 9 V.
2. During battery charger precharge mode.
3. The battery charger negative and positive contactors are closed.
4. The multifunction contactor is open.
5. The heater transistor duty cycle is less than 5 %.
6. None of the following DTCs are set; P0D53 or P0D54.

P0AA1 and P0AE2

The bus voltage is measured to be greater than 80% of battery voltage.

P0AD9, P0ADD, P0AE4, P0D0A, P0D11, and P1EBC

The hybrid/EV powertrain control module 2 has detected an open or short to voltage in the control circuit for the corresponding contactor.

P1EBD

1. The heater transistor is commanded on for 2 seconds.
2. The charger commanded output current is greater than 1 A and the charger output current is less than 1 A.

P1EBE

The Accumulated Battery Current greater than 100 A has been detected for 4 seconds.

P1EBF

CHARGE MODE

The charger high voltage output is greater than 130 V for the first 300 ms of the charger precharge mode.

OR

BATTERY HEATING ONLY MODE

Battery current of more than 1 A is detected at the charger during battery heater only mode.

P1EC0

The main bus voltage is less than 80% of battery voltage.

P1EC3

The hybrid/EV powertrain control module 2 has detected a fault in the heater transistor control circuit.

P1EC4

The total Accumulated Battery Current difference between the battery charger output current and the battery charging current after 4 seconds is less than 200 A.

P1EC5

The battery charger sensed current is greater than 0.4 A during the battery charger precharge mode with the multifunction and heater transistor commanded OFF.

1. DTCs P0AA1, P0AD9, P0AE2, P0AE4, P0D0A, P0D11, P1EBD, P1EBE, P1EC0, or P1EC5 are type A DTCs.
2. The contactors will be opened. OR
3. DTCs P1EBD and P0AF8 set will prevent the precharge transistor and the contactors from closing. OR
4. Battery charging mode will not be available. OR
5. DTCs P0ADD, P1EBC or P1EBF, P1EC3, or P1EC4 are type B DTCs. OR
6. DTC P1EC3 is a type B DTC.
7. The hybrid/EV battery heater will be disabled.

1. DTCs P0AA1, P0AD9, P0AE2, P0AE4, P0D0A, P0D11, P1EBD, P1EBE, P1EC0, or P1EC5 are type A DTCs. OR
2. DTCs P0ADD, P1EBC or P1EBF, P1EC3, or P1EC4 are type B DTCs.

1. DTC P1EC5 may cause a overheat condition and set a DTC P0C4A.
2. DTC P0ADD will result in precharge too long and set a DTC P0C78.
3. DTCs P1EBD, P1EBE, or P1EC0 will set a DTC P0AF8 if the vehicle is ON or vehicle in service mode while the contactors are stuck OPEN
4. DTC P1EC3 or P1EC4 will prevent battery heating and the vehicle will be unable to start in cold weather with battery temperatures below -25°C (-13°F).

Note. If the high voltage contactors opened while under high current load, replace the drive motor battery wire junction block relay. The following conditions could cause the high voltage contactors to open while under high current load

1. A collision resulting in supplemental inflatable restraint deployment.
2. A loss of power or ground to the hybrid/EV powertrain control module 2 while the vehicle is moving.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. EL-48900 HEV Safety Kit
2. EL-50211 Low Voltage Jumper Harness Extension
3. EL-50772 Insulation Multimeter

For equivalent regional tools, refer to Special Tools .

1. Vehicle in Service Mode.
2. Verify that DTC P0AA1, P0AD9, P0ADD, P0AE2, P0AE4, P0D0A, P0D11, P1EBC-P1EBF, P1EC0, or P1EC3-P1EC5 is not set. If any of the DTCs are set Refer to Circuit/System Testing. If none of the DTCs are set
3. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
4. OPEN the driver door using outside door handle. Leave driver door OPEN.
5. PRESS and HOLD the brake pedal.
6. Command the Hybrid/EV Battery Contactors ALL OPEN with a scan tool.
7. Disconnect the S15 Manual Service Disconnect.
8. Command the Hybrid/EV Battery Negative Contactor CLOSED and ALL OPEN with a scan tool while listening for the contactor to close and open.
9. Verify the Hybrid/EV Battery Negative Contactor is heard closing and opening. If the Hybrid/EV Battery Negative Contactor does not open and close Refer to Hybrid/EV Battery Negative Contactor Diagnosis. If the Hybrid/EV Battery Negative Contactor does open and close
10. Command the Hybrid/EV Battery Positive Contactor CLOSED and ALL OPEN with a scan tool while listening for the contactor to close and open.
11. Verify the Hybrid/EV Battery Positive Contactor is heard closing and opening. If the Hybrid/EV Battery Positive Contactor does not open and close Refer to Hybrid/EV Battery Positive Contactor Diagnosis. If the Hybrid/EV Battery Positive Contactor does open and close
12. Command the Battery Charging System Negative Contactor CLOSED and ALL OPEN with a scan tool while listening for the contactor to close and open.
13. Verify the Battery Charging System Negative Contactor is heard closing and opening. If the Battery Charging System Negative Contactor does not open and close Refer to Battery Charging System Negative Contactor Diagnosis. If the Battery Charging System Negative Contactor does open and close
14. Command the Battery Charging System Positive Contactor CLOSED and ALL OPEN with a scan tool while listening for the contactor to close and open.
15. Verify the Battery Charging System Positive Contactor is heard closing and opening. If the Battery Charging System Positive Contactor does not open and close Refer to Battery Charging System Positive Contactor Diagnosis. If the Battery Charging System Positive Contactor does open and close
16. Command the Hybrid/EV Battery Multifunction Contactor CLOSED and ALL OPEN with a scan tool while listening for the contactor to close and open.
17. Verify the Hybrid/EV Battery Multifunction Contactor is heard opening and closing. If the Hybrid/EV Battery Multifunction Contactor does not open and close Refer to Hybrid/EV Battery Multifunction Contactor Diagnosis. If the Hybrid/EV Battery Multifunction Contactor does open and close
18. Connect the S15 Manual Service Disconnect.
19. Clear DTCs with a scan tool.
20. RELEASE the brake pedal.
21. CLOSE the driver door.
22. Connect the charge cord and complete a charge cycle. With the charge cord connected, use the key FOB to initiate a remote start.
23. Verify that DTC P1EBD is not set. If DTC P1EBD is set Refer to P1EBD - Battery Charging System Contactors Stuck Open Diagnosis. If DTC P1EBD is not set
24. Vehicle ON.
25. Verify that the vehicle is not in REDUCED PROPULSION. If the vehicle is in REDUCED PROPULSION Verify that no DTCs are set. If any DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If no DTCs are set Perform the Hybrid/EV Battery Pack Capacity Learn. Refer to «Hybrid/EV Battery Pack Capacity Learn»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__hybridev-battery-pack-capacity-learn) Vehicle ON. Verify that the vehicle is not in REDUCED PROPULSION and no DTCs are set. If the vehicle is in REDUCED PROPULSION and DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If the vehicle is ON and no DTCs are set All OK. If the vehicle is ON and no DTCs are set
26. All OK.

P0AE2 or P0AE4 - Hybrid/EV Battery Precharge Transistor Diagnosis

1. Vehicle OFF, disconnect the X2 harness connector at the A4 Hybrid/EV Battery Pack.
2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Vehicle OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Verify that a test lamp illuminates between each A4 Hybrid/EV Battery Pack harness connector B+ terminals listed below and ground: Terminal 1 Terminal 9 If the test lamp does not illuminate for either circuit and the circuit fuse is good Vehicle OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate for either circuit and the circuit fuse is open Vehicle OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K16 Battery Energy Control Module and A28 Hybrid/EV Battery Contactor Assembly. If the test lamp illuminates for both circuits
4. Vehicle OFF, disconnect the X1 harness connector at the A4 Hybrid/EV Battery Pack. Vehicle in Service Mode.
5. Verify that a test lamp does not illuminate between the A4 Hybrid/EV Battery Pack harness control circuit terminal 11 X1 and ground. If the test lamp illuminates Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid Powertrain Control Module 2. If the test lamp does not illuminate
6. Vehicle OFF.
7. Test for infinite resistance between the A4 Hybrid/EV Battery Pack harness control circuit terminal 11 X1 and ground. If less than infinite resistance Repair the short to ground on the circuit. If infinite resistance
8. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater Repair the open/high resistance in the circuit. If less than 2 ohms
9. Replace the A28 Hybrid/EV Battery Contactor Assembly.
10. Verify that DTC P0AE2 or P0AE4 does not set while operating the vehicle within the Conditions for Running the DTC. If either DTC sets Replace the K114B Hybrid Powertrain Control Module 2. If either DTC does not set
11. All OK.

P1EC3, P1EC4, or P1EC5 - Hybrid/EV Battery Pack Heater Transistor Diagnosis

1. Vehicle in Service Mode.
2. Verify that DTC P0AA6 or P1EC6 is not set. If either DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If both DTCs are not set
3. Verify that DTC P0AA1, P0AD9, P0ADD, P0D0A, P0D11, P1EBC-P1EBF, or P1EC0, is not set. If any contactor DTC is set Refer to the appropriate contactor Circuit/System Testing. If no contactor DTC is set
4. Vehicle OFF, disconnect the X2 harness connector at the A4 Hybrid/EV Battery Pack.
5. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Vehicle OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
6. Verify that a test lamp illuminates between each A4 Hybrid/EV Battery Pack harness connector B+ terminals listed below and ground: Terminal 1 Terminal 9 If the test lamp does not illuminate for either circuit and the circuit fuse is good Vehicle OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate for either circuit and the circuit fuse is open Vehicle OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K16 Battery Energy Control Module and A28 Hybrid/EV Battery Contactor Assembly. If the test lamp illuminates for both circuits
7. Vehicle in Service Mode.
8. Verify that a test lamp does not illuminate between the A4 Hybrid/EV Battery Pack harness control circuit terminal 2 and ground. If the test lamp illuminates Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid Powertrain Control Module 2. If the test lamp does not illuminate
9. Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid Powertrain Control Module 2.
10. Test for infinite resistance between the A4 Hybrid/EV Battery Pack harness control circuit terminal 2 and ground. If less than infinite resistance Repair the short to ground on the circuit. If infinite resistance
11. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater Repair the open/high resistance in the circuit. If less than 2 ohms
12. Verify that DTC P1EC4 is not set If the DTC is set Remove the Drive Motor Battery Cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) Disconnect the harness connector at the E54 hybrid/EV battery pack coolant heater. Test for 61-75 ohms between terminal A and terminal B at the E54 hybrid/EV battery pack coolant heater. If not within the specified range, verify that the charger maxi-fuse is not blown. Replace the charger maxi-fuse, if it is blown, and the E54 hybrid/EV battery pack coolant heater. If within the specified range Replace the A28 Hybrid/EV Battery Contactor Assembly. Verify that DTC P1EC3, P1EC4, or P1EC5 does not set while operating the vehicle within the Conditions for Running the DTC. If any of the DTCs set, replace the K114B Hybrid Powertrain Control Module 2. If none of the DTCs set All OK. If the DTC is not set
13. Replace the A28 Hybrid/EV Battery Contactor Assembly.
14. Verify that DTC P1EC3, P1EC4, or P1EC5 does not set while operating the vehicle within the Conditions for Running the DTC. If any of the DTCs set Replace the K114B Hybrid Powertrain Control Module 2. If none of the DTCs set
15. All OK.

P1EC0 - Hybrid/EV Battery System Contactors Stuck Open Diagnosis

1. Vehicle OFF, disconnect the X2 harness connector at the A4 Hybrid/EV Battery Pack.
2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Vehicle OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Verify that a test lamp illuminates between each A4 Hybrid/EV Battery Pack harness connector B+ terminals listed below and ground: Terminal 1 Terminal 9 If the test lamp does not illuminate for either circuit and the circuit fuse is good Vehicle OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate for either circuit and the circuit fuse is open Vehicle OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K16 Battery Energy Control Module and A28 Hybrid/EV Battery Contactor Assembly. If the test lamp illuminates for both circuits
4. Vehicle OFF, disconnect the X1 harness connector at the A4 Hybrid/EV Battery Pack. Vehicle in Service Mode.
5. Verify that a test lamp does not illuminate between each A4 Hybrid/EV Battery Pack harness connector control circuit terminals listed below and ground: Terminal 2 X1 Terminal 4 X1 If the test lamp illuminates on either circuit Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid Powertrain Control Module 2. If the test lamp does not illuminate on both circuits
6. Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2.
7. Test for infinite resistance between each A4 Hybrid/EV Battery Pack harness connector control circuit terminals listed below and ground: Terminal 2 X1 Terminal 4 X1 If less than infinite resistance on either circuit Repair the short to ground on the circuit. If infinite resistance on both circuits
8. Test for less than 2 ohms between the harness connector control circuit terminals listed below: Terminal 2 X1 at the A4 Hybrid/EV Battery Pack and terminal 9 X1 at the K114B Hybrid Powertrain Control Module 2 Terminal 4 X1 at the A4 Hybrid/EV Battery Pack and terminal 6 X1 at the K114B Hybrid Powertrain Control Module 2 If 2 ohms or greater on either circuit Repair the open/high resistance in the circuit. If less than 2 ohms on both circuits
9. Replace the A28 Hybrid/EV Battery Contactor Assembly.
10. Verify that DTC P1EC0 does not set while operating the vehicle within the Conditions for Running the DTC. If the DTC sets Replace the K114B Hybrid Powertrain Control Module 2. If the DTC does not set
11. All OK.

P0ADD - Hybrid/EV Battery Negative Contactor Diagnosis

1. Vehicle OFF, disconnect the X2 harness connector at the A4 Hybrid/EV Battery Pack.
2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Vehicle OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Verify that a test lamp illuminates between each A4 Hybrid/EV Battery Pack harness connector B+ terminals listed below and ground: Terminal 1 Terminal 9 If the test lamp does not illuminate for either circuit and the circuit fuse is good Vehicle OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate for either circuit and the circuit fuse is open Vehicle OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K16 Battery Energy Control Module and A28 Hybrid/EV Battery Contactor Assembly. If the test lamp illuminates for both circuits
4. Vehicle OFF, disconnect the X1 harness connector at the A4 Hybrid/EV Battery Pack. Vehicle in Service Mode.
5. Verify that a test lamp does not illuminate between the A4 Hybrid/EV Battery Pack harness control circuit terminal 4 X1 and ground. If the test lamp illuminates Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid Powertrain Control Module 2. If the test lamp does not illuminate
6. Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2.
7. Test for infinite resistance between the A4 Hybrid/EV Battery Pack harness control circuit terminal 4 X1 and ground. If less than infinite resistance Repair the short to ground on the circuit. If infinite resistance
8. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater Repair the open/high resistance in the circuit. If less than 2 ohms
9. Replace the A28 Hybrid/EV Battery Contactor Assembly.
10. Verify that DTC P0ADD does not set while operating the vehicle within the Conditions for Running the DTC. If the DTC sets Replace the K114B Hybrid Powertrain Control Module 2. If the DTC does not set
11. All OK.

P0AA1 or P0AD9 - Hybrid/EV Battery Positive Contactor Diagnosis

1. Vehicle OFF, disconnect the X2 harness connector at the A4 Hybrid/EV Battery Pack.
2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Vehicle OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Verify that a test lamp illuminates between each A4 Hybrid/EV Battery Pack harness connector B+ terminals listed below and ground: Terminal 1 Terminal 9 If the test lamp does not illuminate for either circuit and the circuit fuse is good Vehicle OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate for either circuit and the circuit fuse is open Vehicle OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K16 Battery Energy Control Module and A28 Hybrid/EV Battery Contactor Assembly. If the test lamp illuminates for both circuits
4. Vehicle OFF, disconnect the X1 harness connector at the A4 Hybrid/EV Battery Pack. Vehicle in Service Mode.
5. Verify that a test lamp does not illuminate between the A4 Hybrid/EV Battery Pack harness control circuit terminal 2 X1 and ground. If the test lamp illuminates Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid Powertrain Control Module 2. If the test lamp does not illuminate
6. Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2.
7. Test for infinite resistance between the A4 Hybrid/EV Battery Pack harness control circuit terminal 2 X1 and ground. If less than infinite resistance Repair the short to ground on the circuit. If infinite resistance
8. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater Repair the open/high resistance in the circuit. If less than 2 ohms
9. Replace the A28 Hybrid/EV Battery Contactor Assembly.
10. Verify that DTC P0AA1 or P0AD9 does not set while operating the vehicle within the Conditions for Running the DTC. If either DTC sets Replace the K114B Hybrid Powertrain Control Module 2. If both DTCs do not set
11. All OK.

P1EBD - Battery Charging System Contactors Stuck Open Diagnosis

1. Vehicle in Service Mode, verify that DTC P0AF8 is not set. NOTE: DTC P0AF8 may also cause DTC P1EBD to set. Diagnose DTC P0AF8 first before diagnosing DTC P1EBD. If DTC P0AF8 is set Refer to «DTC P0AF8»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) If DTC P0AF8 is not set
2. Vehicle OFF, disconnect the X2 harness connector at the A4 Hybrid/EV Battery Pack.
3. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Vehicle OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
4. Verify that a test lamp illuminates between each A4 Hybrid/EV Battery Pack harness connector B+ terminals listed below and ground: Terminal 1 Terminal 9 If the test lamp does not illuminate for either circuit and the circuit fuse is good Vehicle OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate for either circuit and the circuit fuse is open Vehicle OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K16 Battery Energy Control Module and A28 Hybrid/EV Battery Contactor Assembly. If the test lamp illuminates for both circuits
5. Vehicle OFF, disconnect the X1 harness connector at the A4 Hybrid/EV Battery Pack. Vehicle in Service Mode.
6. Verify that a test lamp does not illuminate between each A4 Hybrid/EV Battery Pack harness connector control circuit terminals listed below and ground: Terminal 7 X1 Terminal 9 X1 If the test lamp illuminates on either circuit Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K144B Hybrid Powertrain Control Module 2. If the test lamp does not illuminate on both circuits
7. Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2.
8. Test for infinite resistance between each A4 Hybrid/EV Battery Pack harness connector control circuit terminals listed below and ground: Terminal 7 X1 Terminal 9 X1 If less than infinite resistance on either circuit Repair the short to ground on the circuit. If infinite resistance on both circuits
9. Test for less than 2 ohms between the harness connector terminals listed below: Terminal 7 X1 at the A4 Hybrid/EV Battery Pack and terminal 3 X1 at the K114B Hybrid Powertrain Control Module 2 Terminal 9 X1 at the A4 Hybrid/EV Battery Pack and terminal 5 X1 at the K114B Hybrid Powertrain Control Module 2 If 2 ohms or greater on either circuit Repair the open/high resistance in the circuit. If less than 2 ohms on both circuits
10. Replace the A28 Hybrid/EV Battery Contactor Assembly.
11. Verify that DTC P1EBD does not set while operating the vehicle within the Conditions for Running the DTC. If the DTC sets Replace the K114B Hybrid Powertrain Control Module 2. If the DTC does not set
12. All OK.

P0D11 - Battery Charging System Negative Contactor Diagnosis

1. Vehicle OFF, disconnect the X2 harness connector at the A4 Hybrid/EV Battery Pack.
2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Vehicle OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Verify that a test lamp illuminates between each A4 Hybrid/EV Battery Pack harness connector B+ terminals listed below and ground: Terminal 1 Terminal 9 If the test lamp does not illuminate for either circuit and the circuit fuse is good Vehicle OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate for either circuit and the circuit fuse is open Vehicle OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K16 Battery Energy Control Module and A28 Hybrid/EV Battery Contactor Assembly. If the test lamp illuminates for both circuits
4. Vehicle OFF, disconnect the X1 harness connector at the A4 Hybrid/EV Battery Pack. Vehicle in Service Mode.
5. Verify that a test lamp does not illuminate between the A4 Hybrid/EV Battery Pack harness control circuit terminal 9 X1 and ground. If the test lamp illuminates Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid Powertrain Control Module 2. If the test lamp does not illuminate
6. Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2.
7. Test for infinite resistance between the A4 Hybrid/EV Battery Pack harness control circuit terminal 9 X1 and ground. If less than infinite resistance Repair the short to ground on the circuit. If infinite resistance
8. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater Repair the open/high resistance in the circuit. If less than 2 ohms
9. Replace the A28 Hybrid/EV Battery Contactor Assembly.
10. Verify that DTC P0D11 does not set while operating the vehicle within the Conditions for Running the DTC. If the DTC sets Replace the K114B Hybrid Powertrain Control Module 2. If the DTC does not set
11. All OK.

P0D0A - Battery Charging System Positive Contactor Diagnosis

1. Vehicle OFF, disconnect the X2 harness connector at the A4 Hybrid/EV Battery Pack.
2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Vehicle OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Verify that a test lamp illuminates between each A4 Hybrid/EV Battery Pack harness connector B+ terminals listed below and ground: Terminal 1 Terminal 9 If the test lamp does not illuminate for either circuit and the circuit fuse is good Vehicle OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate for either circuit and the circuit fuse is open Vehicle OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K16 Battery Energy Control Module and A28 Hybrid/EV Battery Contactor Assembly. If the test lamp illuminates for both circuits
4. Vehicle OFF, disconnect the X1 harness connector at the A4 Hybrid/EV Battery Pack. Vehicle in Service Mode.
5. Verify that a test lamp does not illuminate between the A4 Hybrid/EV Battery Pack harness control circuit terminal 7 X1 and ground. If the test lamp illuminates Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid Powertrain Control Module 2. If the test lamp does not illuminate
6. Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2.
7. Test for infinite resistance between the A4 Hybrid/EV Battery Pack harness control circuit terminal 7 X1 and ground. If less than infinite resistance Repair the short to ground on the circuit. If infinite resistance
8. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater Repair the open/high resistance in the circuit. If less than 2 ohms
9. Replace the A28 Hybrid/EV Battery Contactor Assembly.
10. Verify that DTC P0D0A does not set while operating the vehicle within the Conditions for Running the DTC. If the DTC sets Replace the K114B Hybrid Powertrain Control Module 2. If the DTC does not set
11. All OK.

P1EBC, P1EBE, or P1EBF - Hybrid/EV Battery Multifunction Contactor Diagnosis

1. Vehicle OFF, disconnect the X2 harness connector at the A4 Hybrid/EV Battery Pack.
2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Vehicle OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Verify that a test lamp illuminates between each A4 Hybrid/EV Battery Pack harness connector B+ terminals listed below and ground: Terminal 1 Terminal 9 If the test lamp does not illuminate for either circuit and the circuit fuse is good Vehicle OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate for either circuit and the circuit fuse is open Vehicle OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K16 Battery Energy Control Module and A4 Hybrid/EV Battery Pack. If the test lamp illuminates for both circuits
4. Vehicle OFF, disconnect the X1 harness connector at the A4 Hybrid/EV Battery Pack. Vehicle in Service Mode.
5. Verify that a test lamp does not illuminate between the A4 Hybrid/EV Battery Pack harness control circuit terminal 6 X1 and ground. If the test lamp illuminates Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid Powertrain Control Module 2. If the test lamp does not illuminate
6. Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2.
7. Test for infinite resistance between the A4 Hybrid/EV Battery Pack harness control circuit terminal 6 X1 and ground. If less than infinite resistance Repair the short to ground on the circuit. If infinite resistance
8. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater Repair the open/high resistance in the circuit. If less than 2 ohms
9. Replace the A28 Hybrid/EV Battery Contactor Assembly.
10. Verify that DTC P1EBC, P1EBE, or P1EBF does not set while operating the vehicle within the Conditions for Running the DTC. If any of the DTCs set Replace the K114B Hybrid Powertrain Control Module 2. If none of the DTCs set
11. All OK.

Negative Contactor Test

1. Vehicle OFF, disconnect the X1 and X2 harness connectors at the A4 Hybrid/EV Battery Pack.
2. Test for 30-40 ohms between terminal 4 X1 and terminal 5 X2. If not within the specified range Replace the A28 Hybrid/EV Battery Contactor Assembly. If within the specified range
3. All OK

Positive Contactor Test

1. Vehicle OFF, disconnect the X1 and X2 harness connectors at the A4 Hybrid/EV Battery Pack.
2. Test for 30-40 ohms between terminal 2 X1 and terminal 5 X2. If not within the specified range Replace the A28 Hybrid/EV Battery Contactor Assembly. If within the specified range
3. All OK

Charger Negative Contactor Test

1. Vehicle OFF, disconnect the X1 and X2 harness connectors at the A4 Hybrid/EV Battery Pack.
2. Test for 100-127 ohms between terminal 9 X1 and terminal 5 X2. If not within the specified range Replace the A28 Hybrid/EV Battery Contactor Assembly. If within the specified range
3. All OK

Charger Positive Contactor Test

1. Vehicle OFF, disconnect the X1 and X2 harness connectors at the A4 Hybrid/EV Battery Pack.
2. Test for 100-127 ohms between terminal 7 X1 and terminal 5 X2. If not within the specified range Replace the A28 Hybrid/EV Battery Contactor Assembly. If within the specified range
3. All OK

Multifunction Contactor Test

1. Vehicle OFF, disconnect the X1 and X2 harness connectors at the A4 Hybrid/EV Battery Pack.
2. Test for 100-127 ohms between terminal 6 X1 and terminal 5 X2. If not within the specified range Replace the A28 Hybrid/EV Battery Contactor Assembly. If within the specified range
3. All OK

Perform the Diagnostic Repair Verification after completing the repair.

1. «Battery Heater Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system)
2. «Battery Charger and 14 V Power Module Maxi Fuse Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
3. «Drive Motor Battery Wire Junction Block Relay Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
4. «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping)
5. «Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery energy control module and hybrid/EV powertrain control module 2 replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The vehicle is equipped with a high voltage isolation monitor feature. The purpose of the battery energy control module high voltage isolation monitor circuit is to test the resistance between the high voltage positive and negative direct current (DC) bus and chassis ground. The battery energy control module isolation monitoring system measures the resistance between the high voltage system and chassis ground in the following way. The battery energy control module places an AC signal on the high voltage system and monitors its amplitude. A reduced amplitude return signal indicates a loss of resistance to chassis ground. This isolation monitor method is sometimes referred to as the active isolation monitor. The hybrid powertrain control module 2 requests the battery energy control module to perform this test. Measurement values are reported to the hybrid powertrain control module 2, which makes the determination of an isolation fault.

The isolation check for P0AA6 Hybrid Battery Voltage System Isolation Lost runs when all the contactors (main positive, main negative contactor, multi-purpose contactor, charger positive contactor and charger negative contactor) are open. This check monitors isolation in the drive motor battery system. This check runs only once during the time that the hybrid powertrain control module 2 is awake and runs after the contactors have been open for 10 seconds. This monitor typically runs when the vehicle is turned off after a drive. It could also run when the vehicle is first started, if there is a long enough period between the hybrid powertrain control module 2 waking up and the main contactors closing.

The isolation check for P1F0E Battery Charging Voltage System Isolation Lost runs when the main contactors and the multi-purpose contactor are open and the charger contactors are closed. This check monitors for isolation in the charger system along with the drive motor battery system. This check runs once during the time that the hybrid powertrain control module 2 is awake and requires that the contactors main and mult-purpose contactors be open and the charger contactors be closed for 10 seconds.

The battery energy control module runs an internal self check of this sensor circuit. When this test fails, DTC P1AE6 will be set.

P0AA6

1. The hybrid powertrain control module 2 and battery energy control module are awake and communicating
2. All the contactors (main positive, main negative contactor, multi-purpose contactor, charger positive contactor and charger negative contactor) transition to open for 10 seconds.

P1AE6

1. The 12 V battery voltage is greater than 11 V.
2. The hybrid powertrain control module 2 and battery energy control module are awake and communicating.
3. The hybrid powertrain control module 2 has requested the battery energy control module to run the isolation test.
4. The main contactors are open.
5. DTC U185B is not set.

P1F0E

1. The hybrid powertrain control module 2 and battery energy control module are awake and communicating
2. The vehicle is in Charge Mode Only for 10 seconds. Heating or cooling modes are not active.

P0AA6

1. The battery energy control module has detected active isolation resistance is less than 325K ohms.
2. 5 Vehicle ON and Vehicle OFF cycles have occured.

P1AE6

The battery energy control module has detected no return AC signal, thus indicating a fault with the active isolation sensing circuits.

P1F0E

1. During charge mode the battery energy control module has detected active isolation resistance of less than 325K ohms after 10 seconds.
2. 5 Vehicle ON and Vehicle OFF cycles have occured.

DTCs P0AA6, P1AE6 and P1F0E are Type A DTCs.

1. DTCs P0AA6, P1AE6 and P1F0E are Type A DTCs.
2. P0AA6 and P1F0E require one Vehicle ON and Vehicle OFF cycle
3. P0AA6 and P1F0E requires minimum resistance of 400K ohms.

1. A single high voltage contactor stuck closed can set this DTC.
2. An open charger fuse may cause a P1AE6 or P1F0E.
3. Condensation or water intrusion into the hybrid/EV battery pack may cause P0AA6, P1AE6, or P1F0E to set.
4. Low or no coolant in the hybrid/EV battery cooling system may cause P0AA6, P1AE6, or P1F0E to set.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. EL-48900 HEV Safety Kit
2. EL-50772 Insulation Multimeter

For equivalent regional tools, refer to Special Tools .

1. Verify that the vehicle hybrid/EV battery cooling system is full. If the hybrid/EV battery cooling system is low Refer to «HYBRID COOLING SYSTEM LOSS OF COOLANT (BATTERY)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybrid-cooling-system-loss-of-coolant) If the hybrid/EV battery cooling system is full
2. Verify that DTC P0A7E, P0AA1, P0AD9, P0ADD, P0AE2, P0AE4, P0C32, P0D0A, P0D11, P1EBC-P1EBF, P1EC0, P1EC3, or P1EC5 is not set. If any DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If none of the DTCs are set
3. Verify with a scan tool the hybrid powertrain control module 2, Isolation Test Resistance parameter is greater than 500k ohms. If the parameter is 500k ohms or less Refer to Circuit/System Testing If the parameter is greater than 500k ohms
4. All OK.

1. Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. With the EL-50772 Insulation Multimeter, set on the Isolation test setting, test for greater than 400k ohms between the A4 Hybrid/EV Battery Pack harness connector terminals listed below and chassis ground: Terminal B X5 Terminal A X5 If 400k ohms or less Disconnect the X4 connector at the T18 Battery Charger. Test for greater than 400k ohms between the circuit terminals and chassis ground. If 400k ohms or less, replace the 300 V DC cables and test or replace the charger maxi-fuse. If greater than 400k ohms, replace the T18 Battery Charger. If greater than 400k ohms
3. Remove the Drive Motor Battery Cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
4. Disconnect the harness connector at the E54 Hybrid/EV Battery Pack Coolant Heater.
5. Test for 61-75 ohms between terminal A and terminal B at the E54 Hybrid/EV Battery Pack Coolant Heater. If not within the specified range Verify that the charger maxi-fuse is not blown. Replace the charger maxi-fuse if it is blown and the E54 Hybrid/EV Battery Pack Coolant Heater. If within the specified range
6. With the EL-50772 Insulation Multimeter, set on the Isolation test setting, test for 550M ohms between the E54 Hybrid/EV Battery Pack Coolant Heater terminals listed below and battery tray ground: Terminal A Terminal B If less than 550M ohms Verify that the charger maxi-fuse is not blown. Replace the charger maxi-fuse if it is blown and the E54 Hybrid/EV Battery Pack Coolant Heater. If 550M ohms or greater
7. Verify that DTC P0AA6, P1AE6, or P1F0E is not set. If DTC P0AA6 is set Replace the A4 Hybrid/EV Battery Pack If DTC P1AE6, or P1F0E is set Replace the A28 Hybrid Battery Contactor Assembly and K16 Battery Energy Control Module. If none of the DTCs are set
8. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Battery Charger and 14 V Power Module Maxi Fuse Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. «Battery Heater Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system)
3. «300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-APM Module)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «300-Volt Battery Positive and Negative Cable Replacement (Inverter-to-Compressor/Heater Module)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-Charger)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-Inverter)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
4. «Drive Motor Battery Charger Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#plug-in-charging)
5. «Drive Motor Battery Wire Junction Block Relay Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
6. «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping)
7. «Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery energy control module replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV powertrain control module 2 monitors individual cell voltage readings from the battery energy control module. The battery energy control module monitors the voltage of the 96 battery cell groups. Voltage sense lines are attached to each individual cell group, and these sense lines terminate at a connector located on the top surface of the battery section. A serviceable voltage sense harness joins this connector to a hybrid/EV battery interface control module, also located on the top surface of the battery section. The hybrid/EV battery interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery control harness. There is one hybrid/EV battery interface control module located on battery sections one and two, and two hybrid/EV battery interface control modules associated with battery section three. The hybrid/EV battery interface control module, voltage sense harnesses, battery control harness and battery energy control module are all considered serviceable components.

P0ABB

1. The hybrid/EV powertrain control module 2 and battery energy control module is awake and communicating.
2. DTC U0111 or U185A is not set.

P0ABC and P0ABD

1. The hybrid/EV powertrain control module 2 and battery energy control module is awake and communicating.
2. The 12 V battery voltage is greater than or equal to 9 V.
3. DTC P1A07 is not set.

P0ABB

The hybrid/EV powertrain control module 2 detects difference of 10 V between the average cell group voltage multiplied by 96 and the voltage measured at battery side of the main contactors.

P0ABC

The battery energy control module detects the terminal voltage is less than 24 V on the battery side of the main contactors.

P0ABD

The battery energy control module detects the terminal voltage is greater than 456 V on the battery side of the main contactors.

DTCs P0ABB, P0ABC, and P0ABD are type B DTCs.

DTCs P0ABB, P0ABC, and P0ABD are type B DTCs.

1. The hybrid/EV battery pack high voltage manual service disconnect is out, not installed correctly, or a blown manual service disconnect fuse will cause P0ABB and/or P0ABC to set.
2. The hybrid/EV battery pack high voltage manual service disconnect was removed, out of sequence, or was out during a service procedure with the 12 V battery connected will cause P0ABB and/or P0ABC to set.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

1. Vehicle in Service Mode.
2. Verify that no other DTCs are set. If any DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If no other DTCs are set
3. Verify and record with a scan tool, the battery energy control module Hybrid Battery Pack Terminal 1 Voltage parameter and the hybrid/EV powertrain control module 2 Hybrid Battery Pack Voltage parameters are between 205-419 V and within 10 V of each other. If not within the specified range and not within 10 V of each other Refer to Circuit/System Testing. If within the specified range and within 10 V of each other
4. All OK.

P0ABB

1. Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. Remove the A4 Hybrid/EV Battery Pack cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) . Disconnect X3 harness connector at the K16 Battery Energy Control Module.
3. Test for less than 10 ohms between the terminals listed below: Ground (300 V) C5A at the A28 Hybrid/EV Battery Contactor Assembly and terminal 4 X3 at the K16 Battery Energy Control Module B+ (300 V) C5J at the A28 Hybrid/EV Battery Contactor Assembly and terminal 1 X3 at the K16 Battery Energy Control Module If 10 ohms or greater Replace the A28 Hybrid/EV Battery Contactor Assembly. If less than 10 ohms
4. Install a known good S15 manual service disconnect.
5. Test for 205-419 V between B+ (300 V) C5J and Ground (300 V) C5A. If not within the specified range Replace the A4 Hybrid/EV Battery Pack. If within the specified range
6. Verify the measured voltage is within 10 V of the recorded scan tool battery energy control module Hybrid Battery Pack Terminal 1 Voltage parameter. If 10 V or greater Replace the K16 Battery Energy Control Module. If less than 10 V
7. Test for less than 10 ohms between the terminal 5 and 6 of the S15 Manual Service Disconnect. If 10 ohms or greater Replace the S15 Manual Service Disconnect. Operate the vehicle according to the DTC Conditions for Running and ensure that DTC P0ABB does not set. If DTC P0ABB is set, replace the K114B Hybrid/EV Powertrain Control Module 2. If DTC P0ABB is not set All OK. If less than 10 ohms
8. Replace the K114B Hybrid/EV Powertrain Control Module 2.

P0ABC or P0ABD

1. Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. Remove the A4 Hybrid/EV Battery Pack cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) . Disconnect X3 harness connector at the K16 Battery Energy Control Module.
3. Test for less than 10 ohms between the terminals listed below: Ground (300 V) C5A at the A28 Hybrid/EV Battery Contactor Assembly and the K16 Battery Energy Control Module terminal 4 X3 B+ (300 V) C5J at the A28 Hybrid/EV Battery Contactor Assembly and the K16 Battery Energy Control Module terminal 1 X3 If 10 ohms or greater Replace the A28 Hybrid/EV Battery Contactor Assembly. If less than 10 ohms
4. Replace the K16 Battery Energy Control Module.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Drive Motor Battery Wire Junction Block Relay Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping)
3. «Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery energy control module and hybrid/EV powertrain control module 2 replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV battery current sensor is mounted inside the hybrid/EV battery pack. The positive high voltage cable that goes to the positive contactor relay passes through the hybrid/EV battery pack current sensor. The hybrid/EV battery pack current sensor detects the amperage that flows in and out of the hybrid/EV batteries. The battery energy control module supplies and monitors a 5 V reference signal to the hybrid/EV battery pack current sensor. The hybrid/EV battery pack current sensor returns a signal between 0 and 5 V to the battery energy control module. The hybrid/EV battery pack current sensor signal is in proportion to the amperage going in and out of the hybrid/EV battery pack. A signal voltage of the hybrid/EV battery pack current sensor greater than 2.5 V indicates that the hybrid/EV battery is being charged and a signal voltage less than 2.5 V indicates discharging. The hybrid/EV battery pack current sensor has 2 measurement ranges in order to maintain accuracy. The ranges are low resolution and high resolution. The measurement ranges of the hybrid/EV battery pack current sensor have some overlap with each other. The high resolution measures from -23 to +23 A. The low resolution measures from -470 to +280 A.

P0AC1, P0AC2, P0B10, and P0B11

1. The 12 V battery voltage is greater than or equal to 9 V.
2. The battery energy control module is awake and communicating.
3. DTC P1A07 is not set.

P0B13

1. The hybrid/EV battery low resolution current sensor or the hybrid/EV battery high resolution current sensor value is between -20 and +20 A.
2. None of the following DTCs are set: P0AC1, P0AC2, P1EBA, P1A07, P0B10, P0B11, P1EBB.

P1EBA and P1EBB

1. Runs during battery energy control module initialization.
2. The 12 V battery voltage is greater than or equal to 9 V.
3. The high voltage main and charger contactors are open (during wake-up).
4. DTC P1A07 is not set.

P0AC1

The battery energy control module detects that the hybrid/EV battery pack current sensor low resolution is less than -470 A.

P0AC2

The battery energy control module detects that the hybrid/EV battery pack current sensor low resolution is greater than +280 A.

P0B10

The battery energy control module detects that the hybrid/EV battery pack current sensor high resolution is less than -23 A.

P0B11

The battery energy control module detects that the hybrid/EV battery pack current sensor high resolution is greater than +23 A.

P0B13

The difference between the Hybrid/EV Battery's low resolution current sensor value and its high resolution current sensor value is greater than 10 A.

P1EBA

The battery energy control module detects that the Pack Current Low Resolution Offset is greater than the calibration Low Resolution Offset of 8 A.

P1EBB

The battery energy control module detects that the Pack Current High Resolution Offset is greater than the calibration High Resolution Offset of 2.5 A.

1. DTC P0AC1, P0AC2, P0B10, P0B11, P1EBA and P1EBB are type A DTCs.
2. The driver information center (DIC) displays the SERVICE HYBRID SYSTEM message.
3. If any of these DTCs are set, the vehicle will operate in a reduced power mode and electric only engine ON.
4. The contactors may open at any time.

DTC P0AC1, P0AC2, P0B10, P0B11, P1EBA and P1EBB are type A DTCs.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. EL-48900 HEV Safety Kit
2. EL-50211 Low Voltage Jumper Harness Extension

For equivalent regional tools, refer to Special Tools .

1. Vehicle in Service Mode, all accessories OFF.
2. Verify with a scan tool, the Hybrid/EV Battery Pack Low Resolution Current Sensor is between -470 and +280 A and change with the amount of current draw on the hybrid/EV battery pack. If not within the specified range Refer to Circuit/System Testing. If within the specified range
3. Verify with a scan tool, the Hybrid/EV Battery Pack High Resolution Current Sensor is between -23 and +23 A, and change with the amount of current draw on the hybrid/EV battery pack. If not within the specified range Refer to Circuit/System Testing. If within the specified range
4. All OK.

1. Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. Remove the A4 Hybrid/EV Battery Pack cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
3. Connect the EL-50211 low voltage jumper harness extension. Disconnect the harness connector at the B30 Hybrid/EV Battery Pack Current Sensor.
4. Test for less than 10 ohms between the low reference circuit terminal C and ground. If 10 ohms or greater Vehicle OFF. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K16 Battery Energy Control Module. If less than 10 ohms
5. Connect the 12 V battery. Vehicle in Service Mode.
6. Test for 4.8-5.5 V between the 5 V reference circuit terminal B and ground. If less than 4.8 V Vehicle OFF. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K16 Battery Energy Control Module. If 5.5 V or greater Vehicle OFF, disconnect the X2 harness connector at the K16 Battery Energy Control Module. Vehicle in Service Mode. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K16 Battery Energy Control Module. If within the specified range
7. Verify with a scan tool, the Hybrid/EV Battery Pack High Resolution Current Sensor parameter is less than -0.5 A. If -0.5 A or greater Vehicle OFF, disconnect the X2 harness connector at the K16 Battery Energy Control Module. Vehicle in Service Mode. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K16 Battery Energy Control Module. If less than -0.5 A
8. Install a 3 A fused jumper wire between the signal circuit terminal D and the 5 V reference circuit terminal B.
9. Verify with a scan tool, the Hybrid/EV Battery Pack High Resolution Current Sensor parameter is greater than 0.5 A. If 0.5 A or less Vehicle OFF. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K16 Battery Energy Control Module. If greater than 0.5 A
10. Verify with a scan tool, the Hybrid/EV Battery Pack Low Resolution Current Sensor parameter is less than 100 A. If 100 A or greater Vehicle OFF, disconnect the X2 harness connector at the K16 Battery Energy Control Module. Vehicle in Service Mode. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K16 Battery Energy Control Module. If less than 100 A
11. Install a 3 A fused jumper wire between the signal circuit terminal A and the 5 V reference circuit terminal B.
12. Verify with a scan tool, the Hybrid/EV Battery Pack Low Resolution Current Sensor parameter is greater than 100 A. If less than 100 A Vehicle OFF. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K16 Battery Energy Control Module. If 100 A or greater
13. Replace the B30 Hybrid/EV Battery Pack Current Sensor.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Drive Motor Battery Current Sensor Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. «Battery Energy Control Module Wiring Harness Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
3. «Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery energy control module replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The drive motor battery contains 288 cells. Groups of three cells are welded together in parallel. There are a total of 96 cell groups in the drive motor battery assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 355 V direct current. The battery cells are also grouped together into three sections. The first 90 cells / 30 cell groups make up battery section one. This section is adjacent to the cowl and contains batteries 67 through 96. Battery section two is located behind section one. It is made up of 72 cells / 24 cell groups and contains batteries 43 through 66. The transverse battery section is section number three, it is made up of the remaining 126 cells / 42 cell groups and contains batteries 1 through 42. The three battery sections are individually serviceable components.

The battery energy control module monitors the voltage of the 96 battery cell groups through the four drive motor battery high voltage interface controllers. Voltage sense lines are attached to each individual cell group, and these sense lines terminate at a connector located on the top surface of the battery section. A serviceable voltage sense harness joins this connector to a drive motor battery high voltage interface control module, also located on the top surface of the battery section. The drive motor battery high voltage interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery control harness. There is one drive motor battery high voltage interface control module located on battery sections one and two, and two drive motor battery high voltage interface control modules associated with battery section three. The drive motor battery high voltage interface control module, voltage sense harnesses, battery control harness and battery energy control module are all considered serviceable components.

The battery energy control module will determine when a fault condition is present. Diagnostics and system status are communicated from the battery energy control module to hybrid/EV powertrain control module 2 through serial data. The hybrid powertrain control module 2 is the host controller for diagnostic trouble code information.

1. The hybrid/EV battery main contactors are closed.
2. None of the following DTCs are set; P0ABB, P0ABC, P0ABD, P1A07, P1AE8, P1AE9, P1AEA, P1AEB, P1AEC, P1AED, P1AE20 P1AE27, or P1E28.

OR

1. The hybrid/EV battery main contactors are open.
2. The charger contactors are closed.
3. The multifunction contactor is closed.
4. None of the following DTCs are set; P0ABB, P0ABC, P0ABD, P0D4E, P0D4F, P0D5C, P16C5, P1A07, P1EEB, P1EEC, or P1ECE.

1. The difference between the Hybrid/EV Battery pack voltage and the hybrid/EV powertrain control module 1 bus voltage is greater than 12 V. OR
2. The difference between the Hybrid/EV Battery pack voltage and the charger module's bus voltage is greater than 12 V.

DTC P0AF8 is a type A DTC.

1. DTC P0AF8 is a type A DTC.
2. The «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed to prevent resetting the DTC.

1. An open charger fuse may cause DTC P0AF8 to set.
2. DTCs P1EBD, P1EBE, or P1EC0 will set a DTC P0AF8 if the vehicle is ON or vehicle in service mode while the contactors are stuck OPEN

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

1. Verify that no other DTCs are set. If any DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If no DTCs are set
2. Clear the P0AF8 and perform the Clear Secured High Voltage DTCs reset function. Refer to «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs)
3. Vehicle ON.
4. Verify with a scan tool, the hybrid/EV powertrain control module 1 High Voltage Circuit, hybrid/EV powertrain control module 2 Battery Charger High Output and the battery energy control module Hybrid Battery Pack Terminal 1 Voltage are within 12 V of each other and DTC P0AF8 did not reset. If the parameters are not within 12 V of each other or DTC P0AF8 is set Refer Battery Main Bus Diagnostics. If the parameters are within 12 V of each other and DTC P0AF8 is not set Refer Battery Charger Bus Diagnostics.

Battery Charger Bus Diagnostics

1. Vehicle OFF, disable the high voltage at the T18 Battery Charger. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) . Disconnect the X5 (5) and X7 (8) harness connectors at the A4 Hybrid/EV Battery Pack Assembly.
2. Test for infinite resistance between the harness connector terminals listed below and ground: High voltage DC (-360 V) negative terminal B X5 harness connector at the A4 Hybrid/EV Battery Pack Assembly High voltage DC (+360 V) positive terminal A X5 harness connector at the A4 Hybrid/EV Battery Pack Assembly If less than infinite resistance Replace the high voltage DC cables. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed. If infinite resistance
3. Test for infinite resistance between the terminals the High voltage DC (+360 V) positive terminal A and the high voltage DC (-360 V) negative terminal B X5 harness connector at the A4 Hybrid/EV Battery Pack Assembly. If less than infinite resistance Replace the high voltage DC cables. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed. If infinite resistance
4. Test for less than 10 ohms between the terminals listed below: High voltage DC (-360 V) negative terminal B X4 harness connector at the T18 Battery Charger and the high voltage DC (-360 V) negative terminal B X5 harness connector at the A4 Hybrid/EV Battery Pack Assembly. High voltage DC (+360 V) positive terminal A X4 harness connector at the T18 Battery Charger and the high voltage DC (+360 V) negative terminal A X5 harness connector at the A4 Hybrid/EV Battery Pack Assembly. If 10 ohms or greater Replace the high voltage DC cables. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed. If less than 10 ohms
5. Replace the T18 Battery Charger.
6. Verify that DTC P0AF8 does not set while operating the vehicle within the Conditions for Running the DTC. If DTC P0AF8 sets Replace the A4 Hybrid/EV Battery Pack Assembly. If DTC P0AF8 does not set
7. All OK.

Battery Main Bus Diagnostics

1. Vehicle OFF, disable the high voltage at the T6 Power Inverter Module. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) . Disconnect the F118 (6) and X3 (3) harness connectors at the A4 Hybrid/EV Battery Pack Assembly.
2. Test for infinite resistance between the harness connector terminals listed below and ground: High voltage DC (-360 V) negative terminal B X3 harness connector at the A4 Hybrid/EV Battery Pack Assembly High voltage DC (+360 V) positive terminal A X3 harness connector at the A4 Hybrid/EV Battery Pack Assembly If less than infinite resistance Replace the high voltage DC cables. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed. If infinite resistance
3. Test for infinite resistance between the terminals the High voltage DC (+360 V) positive terminal A and the high voltage DC (-360 V) negative terminal B X3 harness connector at the A4 Hybrid/EV Battery Pack Assembly. If less than infinite resistance Replace the high voltage DC cables. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed. If infinite resistance
4. Test for less than 10 ohms between the terminals listed below: High voltage DC (-360 V) negative terminal B X3 harness connector at the A28 hybrid/EV battery contactor assembly and the high voltage DC (-360 V) negative terminal B X3 harness connector at the T6 Power Inverter Module. High voltage DC (+360 V) positive terminal A X3 harness connector at the A28 hybrid/EV battery contactor assembly and the high voltage DC (+360 V) negative terminal A X3 harness connector at the T6 Power Inverter Module. If 10 ohms or greater Replace the high voltage DC cables. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed. If less than 10 ohms
5. Replace the T6 Power Inverter Module.
6. Verify that DTC P0AF8 does not set while operating the vehicle within the Conditions for Running the DTC. If DTC P0AF8 sets Replace the A4 Hybrid/EV Battery Pack Assembly. If DTC P0AF8 does not set
7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-APM Module)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «300-Volt Battery Positive and Negative Cable Replacement (Inverter-to-Compressor/Heater Module)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-Charger)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-Inverter)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping)
3. «Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery charger, power inverter module replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The battery energy control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the battery energy control module to the hybrid/EV powertrain control module 2 through serial data. The hybrid/EV powertrain control module 2 is the host controller for diagnostic trouble code (DTC) information. The battery energy control module monitors the hybrid/EV battery voltage at the battery side of the high voltage main contactors.

1. The battery energy control module is awake and communicating.
2. None of the following DTCs are set; P0ABC, P0ABD, P1A07, P0AF8, P0ABB, P0B3D, P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88, P0B8D, P0B92, P0B97, P0B9C, P0BA1, P0BA6, P0BAB, P0BB0, P0BB5, P0BBA, P1B17, P1B1A, P1B1D, P1B20, P1B23, P1B26, P1B46, P1B49, P1B4C, P1B4F, P1B52, P1B55, P1B58, P1B5B, P1B5E, P1B61, P1B64, P1B67, P1B6A, P1B6D, P1B70, P1B73, P1B76, P1B79, P1B7C, P1B7F, P1B82, P1B85, P1B88, P1B8B, P1B8E, P1B91, P1B94, P1B97, P1B9A, P1B9D, P1BA0, P1BA3, P1BA6, P1BA9, P1BAC, P1BAF, P1BB2, P1BB5, P1BB8, P1BBB, P1BBE, P1BC1, P1BC4, P1BC7, P1BCA, P1BCD, P1BD0, P1BD3, P1BD6, P1BD9, P1BDC, P1BDF, P1BE2, P1BE5, P1BE8, P1BEB, P1BEE, P1BF1, P1BF4, P1BF7, P1BFA, P1BFD, P1E02, P1E05, P0B3E, P0B43, P0B48, P0B4D, P0B52, P0B57, P0B5C, P0B61, P0B66, P0B6B, P0B70, P0B75, P0B7A, P0B7F, P0B84, P0B89, P0B8E, P0B93, P0B98, P0B9D, P0BA2, P0BA7, P0BAC, P0BB1, P0BB6, P0BBB, P1B18, P1B1B, P1B1E, P1B21, P1B24, P1B27, P1B47, P1B4A, P1B4D, P1B50, P1B53, P1B56, P1B59, P1B5C, P1B5F, P1B62, P1B65, P1B68, P1B6B, P1B6E, P1B71, P1B74, P1B77, P1B7A, P1B7D, P1B80, P1B83, P1B86, P1B89, P1B8C, P1B8F, P1B92, P1B95, P1B98, P1B9B, P1B9E, P1BA1, P1BA4, P1BA7, P1BAA, P1BAD, P1BB0, P1BB3, P1BB6, P1BB9, P1BBC, P1BBF, P1BC2, P1BC5, P1BC8, P1BCB, P1BCE, P1BD1, P1BD4, P1BD7, P1BDA, P1BDD, P1BE0, P1BE3, P1BE6, P1BE9, P1BEC, P1BEF, P1BF2, P1BF5, P1BF8, P1BFB, P1BFE, P1E03, P1E06, P1E90, P1E8F, P1E91, P1E8E, P1E93, P1E96, P1E95, P1E97, P1E94, P1E99, P1E9C, P1E9B, P1E9D, P1E9A, P1E9F, P1EA2, P1EA1, P1EA3, P1EA0, P1EA5, P1EB1, P1EB5, P0B3B, P0B40, P0B45, P0B4A, P0B4F, P0B54, P0B59, P0B5E, P0B63, P0B68, P0B6D, P0B77, P0B7C, P0B81, P0B86, P0B8B, P0B95, P0B9A, P0B9F, P0BA4, P0BA9, P0BAE, P0BB3, P0BB8, P1B28, P1B29, P1B2A, P1B2B, P1B2C, P1B2D, P1E4C, P1E4D, P1E4E, P1E4F, P1E50, P1E51, P1E52, P1E53, P1E54, P1E56, P1E57, P1E58, P1E59, P1E5A, P1E5B, P1E5C, P1E5D, P1E5E, P1E5F, P1E60, P1E61, P1E62, P1E63, P1E64, P1E65, P1E66, P1E67, P1E68, P1E69, P1E6A, P1E6B, P1E6C, P1E6E, P1E6F, P1E70, P1E71, P1E72, P1E73, P1E74, P1E75, P1E76, P1E77, P1E78, P1E79, P1E7A, P1E7B, P1E7C, P1E7D, P1E7E, P1E7F, P1E80, P1E81, P1E82, P1E83, P1E84, P1E86, P1E87, P1E88, P1E89, P1E8A, P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C, P0B91, P0B96, P0B9B, P0BA0, P0BA5, P0BAA, P0BAF, P0BB4, P0BB9, P1B16, P1B19, P1B1C, P1B1F, P1B22, P1B25, P1B45, P1B48, P1B4B, P1B4E, P1B51, P1B54, P1B57, P1B5A, P1B5D, P1B60, P1B63, P1B66, P1B69, P1B6C, P1B6F, P1B72, P1B75, P1B78, P1B7B, P1B7E, P1B81, P1B84, P1B87, P1B8A, P1B8D, P1B90, P1B93, P1B96, P1B99, P1B9C, P1B9F, P1BA2, P1BA5, P1BA8, P1BAB, P1BAE, P1BB1, P1BB4, P1BB7, P1BBA, P1BBD, P1BC0, P1BC3, P1BC6, P1BC9, P1BCC, P1BCF, P1BD2, P1BD5, P1BD8, P1BDB, P1BDE, P1BE1, P1BE4, P1BE7, P1BEA, P1BED, P1BF0, P1BF3, P1BF6, P1BF9, P1BFC, P1E01, P1E04

P0AFA

The Hybrid Battery Pack Voltage is less than 205 V.

OR

The Minimum Hybrid Battery Cell Group Voltage in the hybrid battery is less than 2.05 V.

P0AFB

The Hybrid Battery Pack Voltage is greater than 419 V.

OR

The Maximum Hybrid Battery Cell Group Voltage in the hybrid battery is greater than 4.4 V.

1. DTCs P0AFA and P0AFB are type A DTCs.
2. If any of these DTCs are set, the vehicle will operate in a reduced power mode and charge sustaining mode.
3. Once the vehicle has been turned OFF the contactors will be prevented from closing.

P0AFA and P0AFB

1. DTCs P0AFA and P0AFB are type A DTCs.
2. The «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed with a scan tool before clear codes.

The hybrid/EV battery pack high voltage manual service disconnect is not installed correctly, or a blown manual service disconnect fuse will cause P0AFA to set.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. EL-48571-25 High Voltage Battery Pin Out Box
2. EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

1. Vehicle in Service Mode.
2. Verify that DTC P0AA1, P0AD9, P0ADD, P0AE2, P0AE4, P0B3B, P0B3C, P0B3D, P0B3E, P0B40, P0B41, P0B42, P0B43, P0B45, P0B46, P0B47, P0B48, P0B4A, P0B4B, P0B4D, P0B4C, P0B4F, P0B50, P0B51, P0B52, P0B54, P0B55, P0B56, P0B57, P0B59, P0B5A, P0B5B, P0B5C, P0B5E, P0B60, P0B5F, P0B61, P0B63, P0B64, P0B65, P0B66, P0B69, P0B68, P0B6A, P0B6D, P0B6B, P0B6E, P0B70, P0B6F, P0B72, P0B74, P0B73, P0B75, P0B77, P0B78, P0B79, P0B7A, P0B7D, P0B7C, P0B7E, P0B7F, P0B81, P0B82, P0B83, P0B84, P0B86, P0B87, P0B88, P0B89, P0B8B, P0B8C, P0B8D, P0B8E, P0B90, P0B91, P0B92, P0B93, P0B95, P0B96, P0B97, P0B98, P0B9A, P0B9B, P0B9C, P0B9D, P0B9F, P0BA1, P0BA0, P0BA2, P0BA4, P0BA5, P0BA6, P0BA7, P0BA9, P0BAA, P0BAB, P0BAC, P0BAE, P0BAF, P0BB0 ,P0BB1, P0BB3, P0BB4, P0BB5, P0BB6, P0BB8, P0BB9, P0BBA, P0BBB, P0D0A, P0D11, P1B16, P1B17, P1B18, P1B19, P1B1A, P1B1B, P1B1C, P1B1D, P1B1E, P1B1F, P1B20, P1B21, P1B22, P1B23, P1B24, P1B25, P1B26, P1B27, P1B28, P1B29, P1B2B, P1B2A, P1B2C, P1B2D, P1B45, P1B46, P1B47, P1B48, P1B49, P1B4A, P1B4B, P1B4C, P1B4D, P1B4E, P1B4F, P1B50, P1B51, P1B52, P1B53, P1B54, P1B55, P1B56, P1B57, P1B58, P1B59, P1B5A, P1B5B, P1B5C, P1B5D, P1B5E, P1B5F, P1B60 ,P1B61 ,P1B62, P1B63, P1B64, P1B65, P1B66, P1B67, P1B68, P1B69, P1B6A, P1B6B, P1B6C, P1B6D, P1B6E, P1B6F, P1B70, P1B71, P1B72, P1B73, P1B74, P1B75, P1B76, P1B77, P1B78, P1B79, P1B7A, P1B7B, P1B7C, P1B7D, P1B7F, P1B7E, P1B80, P1B81, P1B82, P1B83, P1B84, P1B85, P1B86, P1B87, P1B88, P1B89, P1B8A, P1B8B, P1B8C, P1B8D, P1B8E, P1B8F, P1B90, P1B91, P1B92, P1B93, P1B94, P1B95, P1B97, P1B96, P1B98, P1B99, P1B9A, P1B9B, P1B9C, P1B9D, P1B9E, P1B9F, P1BA0, P1BA1, P1BA2, P1BA3, P1BA4, P1BA5, P1BA6, P1BA7, P1BA8, P1BA9 ,P1BAB, P1BAA, P1BAC, P1BAD, P1BAE, P1BAF, P1BB0, P1BB1, P1BB2, P1BB3, P1BB4, P1BB5, P1BB6, P1BB7, P1BB8, P1BB9, P1BBA, P1BBB, P1BBC, P1BBD, P1BBE, P1BBF, P1BC0, P1BC1, P1BC2, P1BC3, P1BC4, P1BC5, P1BC6, P1BC7, P1BC8, P1BC9, P1BCA, P1BCB, P1BCC, P1BCE, P1BCD, P1BCF, P1BD0, P1BD2, P1BD1, P1BD3, P1BD4, P1BD5, P1BD6, P1BD7, P1BD8, P1BD9, P1BDA, P1BDB, P1BDD, P1BDC, P1BDE, P1BDF, P1BE1, P1BE0, P1BE3, P1BE2, P1BE4, P1BE5, P1BE6, P1BE7, P1BE8, P1BE9, P1BEA, P1BEB, P1BEC, P1BED, P1BEE, P1BF0, P1BEF, P1BF1, P1BF2, P1BF4, P1BF3, P1BF5, P1BF4, P1BF7, P1BF8, P1BF9, P1BFA, P1BFB, P1BFC, P1BFD, P1BFE, P1E01, P1E02, P1E03, P1E04, P1E05, P1E06, P1E4C, P1E4D, P1E4E, P1E4F, P1E50, P1E51, P1E52, P1E53, P1E54, P1E55, P1E56, P1E57, P1E58, P1E59, P1E5A, P1E5B, P1E5C, P1E5D, P1E5E, P1E5F, P1E60, P1E62, P1E61, P1E63, P1E64, P1E65, P1E66, P1E67, P1E68, P1E69, P1E6A, P1E6B, P1E6D, P1E6C, P1E6E, P1E6F, P1E70, P1E71, P1E72, P1E73, P1E74, P1E76, P1E75, P1E77, P1E78, P1E79, P1E7A, P1E7B, P1E7C, P1E7D, P1E7E, P1E7F, P1E80, P1E81, P1E82, P1E83, P1E84, P1E85, P1E86, P1E87, P1E88, P1E89, P1E8A, P1EBC, P1EBD, P1EBF, P1EC0, P1EC3, P1EC4, P1EC5, U2603, U2604, U2605, U2606, or U2401 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If none of the DTCs are set
3. Verify the scan tool Hybrid/EV Battery Pack Terminal 1 Voltage is between 205-419 V. If not within the specified range Refer to Hybrid Battery Pack Voltage Diagnosis. If within the specified range
4. Verify the scan tool Hybrid/EV Battery 1-96 voltages are between 3.45-4.05 V and all readings are within 0.03 V of each other. If not between 3.45-4.05 V or not within 0.03 V of each other Refer to Hybrid Battery 1-96 Cell Group Diagnosis. If between 3.45-4.05 V and within 0.03 V of each other
5. All OK.

Hybrid Battery Pack Voltage Diagnosis

1. Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. Remove the A4 hybrid/EV battery pack cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
3. Install a known good S15 manual service disconnect.
4. Test for 205-419 V between the Ground (300 V) C5A and B+ (300 V) C5J at the A28 Hybrid/EV Battery Contactor Assembly. If not within the specified range Replace the A4 Hybrid/EV Battery Pack. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed. If within the specified range
5. Disconnect X3 harness connector at the K16 Battery Energy Control Module.
6. Test for less than 10 ohms between the terminals listed below of the A28 Hybrid/EV Battery Contactor Assembly. Ground (300 V) C5A and the K16 Battery Energy Control Module terminal 4 X3 B+ (300 V) C5J and the K16 Battery Energy Control Module terminal 1 X3 If 10 ohms or greater Replace the A28 Hybrid/EV Battery Contactor Assembly. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed. If less than 10 ohms
7. Replace the K16 Battery Energy Control Module. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed.

Hybrid Battery 1-96 Cell Group Diagnosis

1. Vehicle OFF, disable the high voltage at the A4 hybrid/EV battery pack. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
2. Remove the A4 hybrid/EV battery pack cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
3. Disconnect the appropriate K112 Hybrid/EV Battery Interface Control Module harness connector.
4. Connect the EL-48571-25 High Voltage Battery Pin Out Box.
5. Insert the DMM probes into the EL-48571-25 test cavities.
6. Measure and record the voltage of each of the cell groups by cycling the EL-48571-25 through each of the switch positions. Refer to «EL-48571 High Voltage Battery Pin Out Box Reference»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__el-48571-high-voltage-battery-pin-out)
7. Verify each cell group voltage reading is between 3.45-4.05 V. If not within the specified range Test for infinite resistance between the appropriate signal circuit terminal and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the appropriate C4 Hybrid/EV Battery Section. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed. If within the specified range
8. Verify each cell group voltage reading is within 0.03 V of each other. If greater than 0.03 V Replace the appropriate C4 hybrid/EV battery section. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed. Verify that DTC P0AFA or P0AFB does not set while operating the vehicle within the Conditions for Running the DTC. If DTC P0AFA or P0AFB sets, replace the appropriate K112 Hybrid/EV Battery Interface Control Module. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed. If DTC P0AFA or P0AFB does not set All OK. If 0.03 V or less
9. Replace the appropriate K112 Hybrid/EV Battery Interface Control Module. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Drive Motor Battery Wire Junction Block Relay Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. «Cell Battery Replacement (Section 3)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__cell-battery-replacement-section-3) , «Cell Battery Replacement (Section 1)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__cell-battery-replacement-section-1) , «Cell Battery Replacement (Section 2)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__cell-battery-replacement-section-2)
3. «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping)
4. «Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery energy control module and hybrid interface control battery module 1-4 replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV battery pack contains 288 cells. Groups of three cells are welded together in parallel. There are a total of 96 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 355 V direct current. The battery cells are also grouped together into three sections. The first 90 cells / 30 cell groups make up battery section one. This section is adjacent to the cowl and contains batteries 67 through 96. Battery section two is located behind section one. It is made up of 72 cells / 24 cell groups and contains batteries 43 through 66. The transverse battery section is section number three, it is made up of the remaining 126 cells / 42 cell groups and contains batteries 1 through 42. The three battery sections are individually serviceable components.

The hybrid/EV battery energy control module monitors the voltage of the 96 battery cell groups through the four hybrid/EV battery interface control modules. Voltage sense circuits are attached to each individual cell group, and these sense circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness joins this connector to a hybrid/EV battery interface control module, also located on the top surface of the battery section. The hybrid/EV battery interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery control harness. There is one hybrid/EV battery interface control module located on battery sections one and two, and two hybrid/EV battery interface control modules associated with battery section three. The hybrid/EV battery interface control module, hybrid/EV battery energy control module wiring harness, auxiliary battery wiring harness and hybrid/EV battery energy control module are all considered serviceable components.

The hybrid/EV battery energy control module will determine when a fault condition is present. Diagnostics and system status are communicated from the hybrid/EV battery energy control module to hybrid/EV powertrain control module 2 through serial data. The hybrid/EV powertrain control module 2 is the host controller for diagnostic trouble code information.

DTC P0B3B, P0B3D, P0B3E, P0B40, P0B42, P0B43, P0B45, P0B47, P0B48, P0B4A, P0B4C, P0B4D, P0B4F, P0B51, P0B54, P0B52, P0B56, P0B57, P0B59, P0B5B, P0B5C, P0B5E, P0B60, P0B61, P0B63, P0B65, P0B66, P0B68, P0B6A, P0B6B, P0B6D, P0B6F, P0B70, P0B72, P0B74, P0B75, P0B77, P0B79, P0B7A, P0B7C, P0B7E, P0B7F, P0B81, P0B83, P0B84, P0B86, P0B88, P0B89, P0B8B, P0B8D, P0B8E, P0B90, P0B92, P0B93, P0B95, P0B97, P0B98, P0B9A, P0B9C, P0B9D, P0B9F, P0BA1, P0BA2, P0BA4, P0BA6, P0BA7, P0BA9, P0BAB, P0BAC, P0BAE, P0BB0, P0BB1, P0BB3, P0BB5, P0BB6, P0BB8, P0BBA, P0BBB, P1B17, P1B18, P1B1A, P1B1B, P1B1D, P1B1E, P1B20, P1B21, P1B23, P1B24, P1B26, P1B27, P1B28, P1B29, P1B2A, P1B2B, P1B2C, P1B2D, P1B46, P1B47, P1B4A, P1B4C, P1B4D, P1B4F, P1B50, P1B52, P1B53, P1B55, P1B56, P1B58, P1B59, P1B5B, P1B5C, P1B5E, P1B5F, P1B61, P1B64, P1B62, P1B65, P1B67, P1B68, P1B6A, P1B6B, P1B6D, P1B6E, P1B70, P1B71, P1B73, P1B74, P1B76, P1B77, P1B79, P1B7A, P1B7C, P1B7D, P1B7F, P1B80, P1B82, P1B83, P1B85, P1B86, P1B88, P1B89, P1B8B, P1B8C, P1B8E, P1B8F, P1B91, P1B92, P1B94, P1B95, P1B97, P1B98, P1B9A, P1B9B, P1B9D, P1B9E, P1BA0, P1BA1, P1BA3, P1BA4, P1BA6, P1BA7, P1BA9, P1BAA, P1BAC, P1BAD, P1BAF, P1BB0, P1BB2, P1BB3, P1BB5, P1BB6, P1BB8, P1BB9, P1BBB, P1BBC, P1BBE, P1BBF, P1BC1, P1BC2, P1BC4, P1BC5, P1BC7, P1BC8, P1BCA, P1BCB, P1BCD, P1BCE, P1BD0, P1BD1, P1BD3, P1BD4, P1BD6, P1BD7, P1BD9, P1BDA, P1BDC, P1BDD, P1BDF, P1BE0, P1BE2, P1BE3, P1BE5, P1BE6, P1BE8, P1BE9, P1BEB, P1BEC, P1BEE, P1BEF, P1BF1, P1BF2, P1BF4, P1BF5, P1BF7, P1BF8, P1BFA, P1BFB, P1BFD, P1BFE, P1E02, P1E03, P1E05, P1E06, P1E4C, P1E4D, P1E4E, P1E4F, P1E50, P1E51, P1E52, P1E53, P1E54, P1E55, P1E56, P1E57, P1E58, P1E59, P1E5A, P1E5B, P1E5C, P1E5D, P1E5E, P1E5F, P1E60, P1E61, P1E62, P1E63, P1E64, P1E65, P1E66, P1E67, P1E68, P1E69, P1E6A, P1E6B, P1E6C, P1E6D, P1E6E, P1E6F, P1E70, P1E71, P1E72, P1E73, P1E74, P1E75, P1E76, P1E77, P1E78, P1E79, P1E7A, P1E7B, P1E7C, P1E7D, P1E7E, P1E7F, P1E80, P1E81, P1E82, P1E83, P1E84, P1E85, P1E86, P1E87, P1E88, P1E89, P1E8A

All of the following conditions exist

1. Vehicle in Service Mode, Vehicle ON or Engine Running.
2. The hybrid/EV battery energy control module is awake and communicating.
3. None of the following DTCs are set; P1A07, P1E8E, P1E8F, P1E90, P1E91, P1E92, P1E93, P1E94, P1E95, P1E96, P1E97, P1E98, P1E99, P1E9A, P1E9B, P1E9C, P1E9D, P1E9E, P1E9F , P1EA0, P1EA1, P1EA2, P1EA3, P1EA4, P1EA5, P1EB1, P1EB2, P1EB3, P1EB4, P1EB5, U2402, U2603, U2604, U2605, U2606.

DTC P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C, P0B91, P0B96, P0B9B, P0BA0, P0BA5, P0BAA, P0BAF, P0BB4, P0BB9, P1B19, P1B1F, P1B25, P1B45, P1B48, P1B4B, P1B4E, P1B51, P1B54, P1B57, P1B5A, P1B5D, P1B60, P1B63, P1B66, P1B69, P1B6C, P1B6F, P1B72, P1B75, P1B78, P1B7B, P1B7E, P1B81, P1B84, P1B87, P1B8A, P1B8D, P1B90, P1B93, P1B96, P1B99, P1B9C, P1B9F, P1BA2, P1BA5, P1BA8, P1BAB, P1BAE, P1BB1, P1BB4, P1BB7, P1BBA, P1BBD, P1BC0, P1BC3, P1BC6, P1BC9, P1BCC, P1BCF, P1BD2, P1BD5, P1BD8, P1BDB, P1BDE, P1BE1, P1BE4, P1BE7, P1BEA, P1BED, P1BF0, P1BF3, P1BF6, P1BF9, P1BFC, P1E01, P1E04

All of the following conditions exist

1. Vehicle ON.
2. Vehicle speed is greater than 0.
3. There is a change in the Voltage and Current readings.
4. DTC U185A is not set.

Battery Circuit

1. P0B3B, P0B40, P0B45, P0B4A, P0B4F, P0B54, P0B59, P0B5E, P0B63, P0B68, P0B6D, P0B72, P0B77, P0B7C, P0B81, P0B86, P0B8B, P0B90, P0B95, P0B9A, P0B9F, P0BA4, P0BA9, P0BAE, P0BB3, P0BB8, P1B28, P1B29, P1B2A, P1B2B, P1B2C, P1B2D, P1E4C, P1E4D, P1E4E, P1E4F, P1E50, P1E51, P1E52, P1E53, P1E54, P1E55, P1E56, P1E57, P1E58, P1E59, P1E5A, P1E5B, P1E5C, P1E5D, P1E5E, P1E5F, P1E60, P1E61, P1E62, P1E63, P1E64, P1E65, P1E66, P1E67, P1E68, P1E69, P1E6A, P1E6B, P1E6C, P1E6D, P1E6E, P1E6F, P1E70, P1E71, P1E72, P1E73, P1E74, P1E75, P1E76, P1E77, P1E78, P1E79, P1E7A, P1E7B, P1E7C, P1E7D, P1E7E, P1E7F, P1E80, P1E81, P1E82, P1E83, P1E84, P1E85, P1E86, P1E87, P1E88, P1E89, P1E8A are type B DTCs.
2. The hybrid/EV battery energy control module detects high resistance on the circuit.

Circuit Performance

1. P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C, P0B91, P0B96, P0B9B, P0BA0, P0BA5, P0BAA, P0BAF, P0BB4, P0BB9, P1B19, P1B1F, P1B25, P1B45, P1B48, P1B4B, P1B4E, P1B51, P1B54, P1B57, P1B5A, P1B5D, P1B60, P1B63, P1B66, P1B69, P1B6C, P1B6F, P1B72, P1B75, P1B78, P1B7B, P1B7E, P1B81, P1B84, P1B87, P1B8A, P1B8D, P1B90, P1B93, P1B96, P1B99, P1B9C, P1B9F, P1BA2, P1BA5, P1BA8, P1BAB, P1BAE, P1BB1, P1BB4, P1BB7, P1BBA, P1BBD, P1BC0, P1BC3, P1BC6, P1BC9, P1BCC, P1BCF, P1BD2, P1BD5, P1BD8, P1BDB, P1BDE, P1BE1, P1BE4, P1BE7, P1BEA, P1BED, P1BF0, P1BF3, P1BF6, P1BF9, P1BFC, P1E01, P1E04 are type B DTCs.
2. The faulted cell group does not change voltage.

Low Voltage

1. P0B3D,P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88, P0B8D, P0B92, P0B97, P0B9C, P0BA1, P0BA6, P0BAB, P0BB0, P0BB5, P0BBA, P1B17, P1B1A, P1B1D, P1B20, P1B23, P1B26, P1B46, P1B4C, P1B4F, P1B52, P1B55, P1B58, P1B5B, P1B5E, P1B61, P1B64, P1B67, P1B6A, P1B6D, P1B70, P1B73, P1B76, P1B79, P1B7C, P1B7F, P1B82, P1B85, P1B88, P1B8B, P1B8E, P1B91, P1B94, P1B97, P1B9A, P1B9D, P1BA0, P1BA3, P1BA6, P1BA9, P1BAC, P1BAF, P1BB2, P1BB5, P1BB8, P1BBB, P1BBE, P1BC1, P1BC4, P1BC7, P1BCA, P1BCD, P1BD0, P1BD3, P1BD6, P1BD9, P1BDC, P1BDF, P1BE2, P1BE5, P1BE8, P1BEB, P1BEE, P1BF1, P1BF4, P1BF7, P1BFA, P1BFD, P1E02, P1E05 are type B DTCs.
2. Any hybrid/EV battery voltage signal is less than 0.2 V.

High Voltage

1. P0B3E, P0B43, P0B48, P0B4D, P0B52, P0B57, P0B5C, P0B61, P0B66, P0B6B, P0B70, P0B75, P0B7A, P0B7F, P0B84, P0B89, P0B8E, P0B93, P0B98, P0B9D, P0BA2, P0BA7, P0BAC, P0BB1, P0BB6, P0BBB, P1B18, P1B1B, P1B1E, P1B21, P1B24, P1B27, P1B47, P1B4A, P1B4D, P1B50, P1B53, P1B56, P1B59, P1B5C, P1B5F, P1B62, P1B65, P1B68, P1B6B, P1B6E, P1B71, P1B74, P1B77, P1B7A, P1B7D, P1B80, P1B83, P1B86, P1B89, P1B8C, P1B8F, P1B92, P1B95, P1B98, P1B9B, P1B9E, P1BA1, P1BA4, P1BA7, P1BAA, P1BAD, P1BB0, P1BB3, P1BB6, P1BB9, P1BBC, P1BBF, P1BC2, P1BC5, P1BC8, P1BCB, P1BCE, P1BD1, P1BD4, P1BD7, P1BDA, P1BDD, P1BE0, P1BE3, P1BE6, P1BE6, P1BE9, P1BEC, P1BEF, P1BF2, P1BF5, P1BF8, P1BFB, P1BFE, P1E03, P1E06 are type B DTCs.
2. Any hybrid/EV battery voltage signal is greater than 4.8 V.

1. DTC P0B3B-P0BBB, P1B16-1B27, P1B45-P1BFE, P1E01-P1E06 or P1E4C-P1E8A are type B DTCs.
2. If any of these DTCs are set, the vehicle will operate in a reduced power mode and electric only engine ON mode.
3. If additional fault conditions occur, this may cause the contactors to open at anytime.

1. DTC P0B3B-P0BBB, P1B16-1B27, P1B45-P1BFE, P1E01-P1E06 or P1E4C-P1E8A are type B DTCs.
2. No hybrid/EV battery voltage signal is less than 0.2 V or greater than 4.8 V.
3. Vehicle must be cycled from ON to OFF.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. EL-48571-25 High Voltage Battery Pin Out Box
2. EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

1. Vehicle in Service Mode.
2. Verify the scan tool Hybrid/EV Battery 1-96 voltages are between 3.45-4.05 V and all readings are within 0.03 V of each other. If not between 3.45-4.05 V or not within 0.03 V of each other Refer to Circuit/System Testing. If between 3.45-4.05 V and within 0.03 V of each other
3. All OK.

1. Vehicle OFF, disable high voltage at the A4 hybrid/EV battery pack. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. Remove the A4 hybrid/EV battery pack cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
3. Disconnect the appropriate K112 Hybrid/EV Battery Interface Control Module harness connector.
4. Connect the EL-48571-25 High Voltage Battery Pin Out Box.
5. Insert the DMM probes into the EL-48571-25 test cavities.
6. Measure and record the voltage of each of the cell groups by cycling the EL-48571-25 through each of the switch positions. Refer to «EL-48571 High Voltage Battery Pin Out Box Reference»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__el-48571-high-voltage-battery-pin-out)
7. Verify each cell group voltage reading is between 3.45-4.05 V. If not within the specified range Test for infinite resistance between the appropriate signal circuit terminal and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the appropriate C4 Hybrid/EV Battery Section. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed. If within the specified range
8. Verify each cell group voltage reading is within 0.03 V of each other. If greater than 0.03 V Replace the appropriate C4 hybrid/EV battery section. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed. Verify that DTC P0B3B-P0BBB, P1B16-1B27, P1B45-P1BFE, P1E01-P1E06 or P1E4C-P1E8A does not set while operating the vehicle within the Conditions for Running the DTC. If DTC P0B3B-P0BBB, P1B16-1B27, P1B45-P1BFE, P1E01-P1E06 or P1E4C-P1E8A sets, replace the appropriate K112 Hybrid/EV Battery Interface Control Module. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed. If DTC DTC P0B3B-P0BBB, P1B16-1B27, P1B45-P1BFE, P1E01-P1E06 or P1E4C-P1E8A does not set All OK. If 0.03 V or less
9. Replace the appropriate K112 Hybrid/EV Battery Interface Control Module. After the repair is complete with a scan tool, the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Cell Battery Replacement (Section 3)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__cell-battery-replacement-section-3) , «Cell Battery Replacement (Section 1)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__cell-battery-replacement-section-1) , «Cell Battery Replacement (Section 2)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__cell-battery-replacement-section-2)
2. «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping)
3. «Auxiliary Battery Wiring Harness Replacement (Module Harness 2)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Auxiliary Battery Wiring Harness Replacement (Module Harness 3)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Auxiliary Battery Wiring Harness Replacement (Module Harness 4)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Auxiliary Battery Wiring Harness Replacement (Module Harness 1)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
4. «Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid/EV battery energy control module and hybrid/EV battery interface control module 1-4 replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV battery energy control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the hybrid/EV battery energy control module to the hybrid/EV powertrain control module 2 through serial data. The hybrid/EV powertrain control module 2 is the host controller for diagnostic trouble code (DTC) information.

The hybrid/EV battery contains 5 high voltage contactors and 2 transistors. The high voltage contactors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the hybrid/EV battery pack assembly. The 5 high voltage contactors are a main positive high voltage contactor, main negative high voltage contactor, charge positive high voltage contactor, charge negative high voltage contactor, and multi-function high voltage contactor. The 2 transistors are the precharge transistor and heater transistor. These contactors/transistors close and open in sequence and are controlled by the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 supplies voltage to the control circuit for the high voltage contactors and precharge transistors. Ground is provided through the case ground. The hybrid/EV powertrain control module 2 supplies ground for the heater transistor through the hybrid/EV powertrain control module 2 case ground.

P0C77

1. The main contactors are in precharge mode.
2. Battery current sensor has not failed.
3. High Voltage bus voltage less than 40 V before the start of precharge.
4. Bus voltage sensor has not failed.

P0C78

1. Battery voltage sensor has not failed.
2. Bus voltage sensor has not failed.

P0C77

The bus voltage is above 80% of battery voltage in less than 50ms.

P0C78

The bus voltage has not reached 95% of battery voltage in 700ms.

1. DTC P0C77 and P0C78 are type A DTCs.
2. The contactors will be opened.

DTC P0C77 and P0C78 are type A DTCs.

Note. If the high voltage contactors opened while under high current load, replace the drive motor battery wire junction block relay. The following conditions could cause the high voltage contactors to open while under high current load: A collision resulting in supplemental inflatable restraint (SIR) deployment. A loss of power or ground to the hybrid/EV powertrain control module 2 while the vehicle is moving.

The precharge time can be affected by the following

1. A long precharge time may be caused by a stuck open hybrid/EV battery negative or hybrid/EV battery multifunction contactor.
2. A long precharge time may be caused by a stuck ON hybrid/EV battery precharge transistor.
3. A long precharge time may be caused by a short on the propulsion bus preventing the main bus from reaching its target voltage.
4. A short precharge time may be caused by a hybrid/EV battery positive high voltage contactor stuck.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. EL-50772 Insulation Multimeter
2. EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

1. Vehicle in Service Mode.
2. Verify that DTC P0AA1, P0AD9, P0ADD, P0AE2, P0AE4, P0AFA, P0D0A, P0D11, P1EBC-P1EBF, P1EC0, or P1EC3-P1EC5 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If none of the DTCs are set
3. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
4. OPEN the driver door using outside door handle. Leave driver door OPEN.
5. PRESS and HOLD the brake pedal.
6. Command the Hybrid/EV Battery Contactors ALL OPEN with a scan tool.
7. Disconnect the S15 Manual Service Disconnect.
8. Command the Hybrid/EV Battery Negative Contactor CLOSED and ALL OPEN with a scan tool while listening for the contactor to close and open.
9. Verify the Hybrid/EV Battery Negative Contactor should be heard closing and opening. If the Hybrid/EV Battery Negative Contactor does not open and close Refer to Circuit/System Testing. If the Hybrid/EV Battery Negative Contactor does open and close
10. Command the Hybrid/EV Battery Positive Contactor CLOSED and ALL OPEN with a scan tool while listening for the contactor to close and open.
11. Verify the Hybrid/EV Battery Positive Contactor should be heard closing and opening. If the Hybrid/EV Battery Positive Contactor does not open and close Refer to Circuit/System Testing. If the Hybrid/EV Battery Positive Contactor does open and close
12. Command the Hybrid/EV Battery Multifunction Contactor CLOSED and ALL OPEN with a scan tool while listening for the contactor to close and open.
13. Verify the Hybrid/EV Battery Multifunction Contactor should be heard opening and closing. If the Hybrid/EV Battery Multifunction Contactor does not open and close Refer to Circuit/System Testing. If the Hybrid/EV Battery Multifunction Contactor does open and close
14. Verify the scan tool hybrid/EV powertrain control module 1 High Voltage Circuit and hybrid/EV powertrain control module 2 Hybrid Battery Pack Voltage is within 10 V of each other. If not within 10 V of each other Refer to Circuit/System Testing. If within 10 V of each other
15. Vehicle OFF.
16. Verify the scan tool hybrid/EV powertrain control module 1 High Voltage Circuit parameter is less than 3 V and hybrid/EV powertrain control module 2 Hybrid Battery Pack Voltage is between 205-419 V. If not within the specified ranges Refer to Circuit/System Testing. If within the specified ranges
17. All OK.

1. Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. Using the EL-50772 Insulation Multimeter , set on the Isolation test setting, test for greater than 750k ohms between the following points: A4 Hybrid/EV Battery Pack harness connector terminal 2 +300 V X3 and vehicle chassis ground. A4 Hybrid/EV Battery Pack harness connector terminal 1 -300 V X3 and vehicle chassis ground. A4 Hybrid/EV Battery Pack harness connector terminal 1 -300 V X3 and terminal 2 +300 V X3. If less than 750k ohms Replace the 300 V DC cables. If 750k ohms or greater
3. Test for less than 10 ohms between the following points: A4 Hybrid/EV Battery Pack harness connector terminal 2 +300 V X3 and T6 power inverter module harness connector terminal 2 +300 V X3. A4 Hybrid/EV Battery Pack harness connector terminal 1 -300 V X3 and T6 power inverter module harness connector terminal 1 -300 V X3. If 10 ohms or greater Replace the 300 V DC cables. If less than 10 ohms
4. Disconnect the X2 harness connector at the A4 Hybrid/EV Battery Pack. Connect the 12 V battery.
5. Vehicle OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
6. Test for less than 10 ohms between the ground circuit terminal 5 and ground. Vehicle OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
7. Verify that a test lamp illuminates between each A4 Hybrid/EV Battery Pack harness connector B+ terminals listed below and ground: Terminal 1 Terminal 9 If the test lamp does not illuminate for either circuit and the circuit fuse is good Vehicle OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate for either circuit and the circuit fuse is open Vehicle OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K16 Battery Energy Control Module and A28 Hybrid/EV Battery Contactor Assembly. If the test lamp illuminates for both circuits
8. Vehicle OFF, disconnect the X1 harness connector at the A4 Hybrid/EV Battery Pack. Vehicle in Service Mode.
9. Verify that a test lamp does not illuminate between each A4 Hybrid/EV Battery Pack harness connector control circuit terminals listed below and ground: Terminal 2 X1 Terminal 4 X1 Terminal 11 X1 If the test lamp illuminates on any circuit Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid Powertrain Control Module 2. If the test lamp does not illuminate on all circuits
10. Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2.
11. Test for infinite resistance between each A4 Hybrid/EV Battery Pack harness connector control circuit terminals listed below and ground: Terminal 2 X1 Terminal 4 X1 Terminal 11 X1 If less than infinite resistance on either circuit Repair the short to ground on the circuit. If infinite resistance on both circuits
12. Test for less than 2 ohms between the harness connector terminals listed below: Terminal 2 X1 at the A4 Hybrid/EV Battery Pack and terminal 9 X1 at the K114B Hybrid Powertrain Control Module 2 Terminal 4 X1 at the A4 Hybrid/EV Battery Pack and terminal 6 X1 at the K114B Hybrid Powertrain Control Module 2 Terminal 11 X1 at the A4 Hybrid/EV Battery Pack and terminal 8 X1 at the K114B Hybrid Powertrain Control Module 2 If 2 ohms or greater on any circuit Repair the open/high resistance in the circuit. If less than 2 ohms on all circuits
13. Replace the A28 Hybrid/EV Battery Contactor Assembly.
14. Verify that DTC P0C77 or P0C78 does not set while operating the vehicle within the Conditions for Running the DTC. If DTC P0C77 or P0C78 sets Replace the K114B Hybrid Powertrain Control Module 2. If DTC P0C77 or P0C78 does not set
15. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Drive Motor Battery Wire Junction Block Relay Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping)
3. «300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-APM Module)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «300-Volt Battery Positive and Negative Cable Replacement (Inverter-to-Compressor/Heater Module)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-Charger)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-Inverter)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
4. «Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery energy control module, hybrid/EV powertrain control module 2 replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The energy management high voltage interlock circuit is utilized to verify high voltage component integrity. The energy management high voltage interlock circuit is used to determine if access to high voltage components is being attempted. The opening of these high voltage components causes high voltage interlock circuit to open. The hybrid/EV powertrain control module 2 sources about 12 mA of current on the 5 V energy management high voltage interlock circuit loop. The hybrid/EV powertrain control module 2 monitors both the energy management high voltage interlock 5 V reference circuit current and the energy management high voltage interlock signal circuit current in order to detect circuit faults. When the hybrid/EV powertrain control module 2 detects a loss of energy management high voltage interlock circuit current, the high voltage contactors are commanded open.

P0D17

1. The 12 V battery voltage is greater than 9 V.
2. The charger contactors are closed.

P0D18

1. The 12 V battery voltage is greater than 9 V.
2. The hybrid/EV powertrain control module 2 is awake and communicating.

P0D17

The hybrid/EV powertrain control module 2 detects energy management high voltage interlock circuit 5 V reference voltage is less than 1.5 V.

P0D18

The hybrid/EV powertrain control module 2 detects energy management high voltage interlock circuit 5 V reference voltage is greater than 1.2 V before applying 5 V or the signal voltage is greater than 2.2 V after applying 5 V.

1. DTCs P0D17 and P0D18 are Type A DTCs.
2. The hybrid/EV powertrain control module 2 opens the high voltage charger contactors.

DTCs P0D17 and P0D18 are Type A DTCs.

1. Test for a fully engaged hybrid battery pack high voltage manual disconnect whenever an open high voltage interlock circuit condition is observed. The hybrid battery pack high voltage manual disconnect must be pressed down fully in order to engage the high voltage interlock circuit terminals.
2. The high voltage interlock circuit is also routed through several inline connectors and modules.
3. The hybrid/EV powertrain control module 2 will source 12 mA on the charge high voltage interlock circuit anytime the charge cord is plugged in.
4. Tapping or wiggling the F115 Hybrid/EV Battery Pack Fuse Cover may duplicate the condition.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

1. Vehicle in Service Mode.
2. With a scan tool, observe the hybrid/EV powertrain control module 2 Battery Charging System High Voltage Interlock Circuit Status parameter. The parameter indicates a FAIL condition. Refer to Circuit/System Testing The parameter indicates a PASS condition.
3. All OK.

1. Vehicle OFF, disconnect the X1 connector at the K114B Hybrid/EV Powertrain Control Module 2.
2. Test for infinite resistance between the 5 V reference circuit terminal 67 and ground. If less than infinite resistance Disconnect the S15 Manual Service Disconnect. Test for infinite resistance between the 5 V reference circuit terminal 67 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for infinite resistance between the signal circuit terminal 65 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for 35-65 ohms between the following terminals of the S15 Manual Service Disconnect: Terminal 1 and terminal 2 Terminal 3 and terminal 4 If not within the specified range, replace the S15 Manual Service Disconnect. If within the specified range, replace the A4 Battery Pack Assembly. If infinite resistance
3. Test for less than 50 ohms between the 5 V reference circuit terminal 67 and the signal circuit terminal 65. If 50 ohms greater Disconnect the S15 Manual Service Disconnect. Test for 35-65 ohms between the following terminals of the S15 Manual Service Disconnect: Terminal 1 and terminal 2 Terminal 3 and terminal 4 If not within the specified range, replace the S15 Manual Service Disconnect. If within the specified range Test for less than 2 ohms in the 5 V reference circuit terminal 67 end to end. If 2 ohms or greater, repair the open/high resistance on the circuit. If less than 2 ohms Test for less than 2 ohms in the signal circuit terminal 65 end to end. If 2 ohms or greater, repair the open/high resistance on the circuit. If less than 2 ohms, replace the A4 Battery Pack Assembly. If less than 50 ohms
4. Vehicle in Service Mode.
5. Test for less than 1 V in the signal circuit terminal 67 and ground. If 1 V or greater Vehicle OFF, disconnect the X7 connector at the A4 Battery Pack Assembly. Vehicle in Service Mode. Test for less than 1 V in the signal circuit terminal 67 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 1 V in the signal circuit terminal 65 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the A4 Battery Pack Assembly. If less than 1 V
6. Replace the K114B Hybrid/EV Powertrain Control Module 2.

1. Disconnect the S15 Manual Service Disconnect.
2. Test for 35-65 ohms between the following terminals of the S15 Manual Service Disconnect: Terminal 1 and terminal 2 Terminal 3 and terminal 4 If not within the specified range Replace the S15 Manual Service Disconnect. If within the specified range
3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Drive Motor Battery High Voltage Manual Disconnect Lever Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-high-voltage-manual)
2. «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping)
3. «Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid/EV powertrain control module 2 replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The drive motor battery contains 288 cells. Groups of three cells are welded together in parallel. There are a total of 96 cell groups in the drive motor battery assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 volts, for a nominal system voltage of 355 volts direct current. The battery cells are also grouped together into three sections. The first 90 cells / 30 cell groups make up battery section one. This section is adjacent to the cowl and contains batteries 67 through 96. Battery section two is located behind section one. It is made up of 72 cells / 24 cell groups and contains batteries 43 through 66. The transverse battery section is section number three, it is made up of the remaining 126 cells / 42 cell groups and contains batteries 1 through 42. The three battery sections are individually serviceable components.

The battery energy control module monitors the voltage of the 96 cell groups. Voltage sense lines are attached to each individual cell groups, and these sense lines terminate at a connector located on the top surface of the battery section. A serviceable voltage sense harness joins this connector to a hybrid/EV battery interface control module, also located on the top surface of the battery section. The hybrid/EV battery interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery control harness. There is one hybrid/EV battery interface control module located on battery sections one and two, and two hybrid/EV battery interface control modules associated with battery section three. The hybrid/EV battery interface control module, voltage sense harnesses, battery control harness and battery energy control module are all considered serviceable components.

The battery energy control module will determine when a fault condition is present. Diagnostics and system status are communicated from the battery energy control module to hybrid/EV powertrain control module 2 through serial data. The hybrid/EV powertrain control module 2 is the host controller for diagnostic trouble code information.

P1A07

1. The battery energy control module is awake and communicating.
2. The 12 V battery voltage greater than or equal to 9 V.

P1E93, P1E99, P1E9F, P1EA5

1. The vehicle cycles from ON to OFF.
2. The battery energy control module is awake and communicating.
3. No loss of communications between the battery energy control module and any of the hybrid/EV battery interface control modules.
4. The 2nd protection circuit diagnostic is not running.

P1A07

The battery energy control module has detected a fault on the internal 5 V reference circuit.

P1E93, P1E99, P1E9F, P1EA5

1. The 2nd protection circuit diagnostic is not running.
2. A hybrid/EV battery interface control module has detected a fault on the internal 5 V reference circuit.

1. DTCs P1A07 P1E93, P1E99, P1E9F, or P1EA5 are type B DTCs.
2. If any of these DTCs are set, the vehicle will operate in a reduced power mode and electric only engine ON.

DTCs P1A07 P1E93, P1E99, P1E9F, or P1EA5 are type B DTCs.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

Note. Use the schematics to identify the correct drive motor battery interface control module and battery section.

1. Vehicle in Service Mode.
2. Verify that DTC P1A07 is not set. If DTC P1A07 is set Replace the K16 Battery Energy Control Module. If DTC P1A07 is not set
3. Verify that DTC P1E93, P1E99, P1E9F, or P1EA5 is not set. replace the appropriate K112 Hybrid/EV Battery Interface Control Module. If DTC P1E93, P1E99, P1E9F, or P1EA5 is set Replace the appropriate K112 Hybrid/EV Battery Interface Control Module. If DTC P1E93, P1E99, P1E9F, or P1EA5 is not set
4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Drive Motor Battery Interface Control Module Replacement (Module 2)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Drive Motor Battery Interface Control Module Replacement (Module 3)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Drive Motor Battery Interface Control Module Replacement (Module 4)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Drive Motor Battery Interface Control Module Replacement (Module 1)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. «Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery energy control module or hybrid/EV interface control modules replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV powertrain control module 2 performs internal calculations multiple times and compares the results of these calculations to verify proper operation of the internal controller. The result of these calculations is a voltage. This voltage value is an internal value and cannot be measured externally.

1. The 12 V battery voltage is greater than 9 V.
2. The hybrid/EV powertrain control module 2 is awake.

If the results of these calculations differ by more than one volt.

1. DTC P1E3D is a type A DTC.
2. The contactors will be opened.

DTC P1E3D is a type A DTC.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Vehicle in Service Mode.
2. Verify that DTC P1E3D is not set. If DTC P1E3D is set Replace the K114B Hybrid/EV Powertrain Control Module 2. If DTC P1E3D is not set
3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for hybrid/EV powertrain control module 2 replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

To maintain a similar state of charge on the cell groups, the hybrid/EV powertrain control module 2 looks at the cell group voltages and determines which cell groups need energy removed in order to maintain the battery groups at a similar state of charge. This is known as cell balancing. There is a resistor wired in parallel with the cell group and a transistor switch in series with the resistor internal to the hybrid/EV battery interface control module. The hybrid/EV powertrain control module 2 sends a command to the hybrid/EV battery energy control module to begin cell balancing through the hybrid/EV battery interface control modules.

1. The hybrid/EV battery energy control module is awake and communicating.
2. The high voltage fault circuit diagnostic is not running.
3. None of the following DTCs are set, P1E8E, P1E94, P1E9A, P1EA0, U2401, U2603, U2604, U2605, or U2606.

The hybrid/EV battery interface control module has detected an internal cell balancing switch fault.

1. DTCs P1E92, P1E98, P1E9E, and P1EA4 are type B DTCs.
2. Cell balancing is disabled.

DTCs P1E92, P1E98, P1E9E, and P1EA4 are type B DTCs.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

1. Vehicle in Service Mode.
2. Verify that DTC P0B3B, P0B3C, P0B3D, P0B3E, P0B40, P0B41, P0B42, P0B43, P0B45, P0B46, P0B47, P0B48, P0B4A, P0B4B, P0B4D, P0B4C, P0B4F, P0B50, P0B51, P0B52, P0B54, P0B55, P0B56, P0B57, P0B59, P0B5A, P0B5B, P0B5C, P0B5E, P0B60, P0B5F, P0B61, P0B63, P0B64, P0B65, P0B66, P0B69, P0B68, P0B6A, P0B6D, P0B6B, P0B6E, P0B70, P0B6F, P0B72, P0B74, P0B73, P0B75, P0B77, P0B78, P0B79, P0B7A, P0B7D, P0B7C, P0B7E, P0B7F, P0B81, P0B82, P0B83, P0B84, P0B86, P0B87, P0B88, P0B89, P0B8B, P0B8C, P0B8D, P0B8E, P0B90, P0B91, P0B92, P0B93, P0B95, P0B96, P0B97, P0B98, P0B9A, P0B9B, P0B9C, P0B9D, P0B9F, P0BA1, P0BA0, P0BA2, P0BA4, P0BA5, P0BA6, P0BA7, P0BA9, P0BAA, P0BAB, P0BAC, P0BAE, P0BAF, P0BB0 ,P0BB1, P0BB3, P0BB4, P0BB5, P0BB6, P0BB8, P0BB9, P0BBA, P0BBB, P1B16, P1B17, P1B18, P1B19, P1B1A, P1B1B, P1B1C, P1B1D, P1B1E, P1B1F, P1B20, P1B21, P1B22, P1B23, P1B24, P1B25, P1B26, P1B27, P1B28, P1B29, P1B2B, P1B2A, P1B2C, P1B2D, P1B45, P1B46, P1B47, P1B48, P1B49, P1B4A, P1B4B, P1B4C, P1B4D, P1B4E, P1B4F, P1B50, P1B51, P1B52, P1B53, P1B54, P1B55, P1B56, P1B57, P1B58, P1B59, P1B5A, P1B5B, P1B5C, P1B5D, P1B5E, P1B5F, P1B60 ,P1B61 ,P1B62, P1B63, P1B64, P1B65, P1B66, P1B67, P1B68, P1B69, P1B6A, P1B6B, P1B6C, P1B6D, P1B6E, P1B6F, P1B70, P1B71, P1B72, P1B73, P1B74, P1B75, P1B76, P1B77, P1B78, P1B79, P1B7A, P1B7B, P1B7C, P1B7D, P1B7F, P1B7E, P1B80, P1B81, P1B82, P1B83, P1B84, P1B85, P1B86, P1B87, P1B88, P1B89, P1B8A, P1B8B, P1B8C, P1B8D, P1B8E, P1B8F, P1B90, P1B91, P1B92, P1B93, P1B94, P1B95, P1B97, P1B96, P1B98, P1B99, P1B9A, P1B9B, P1B9C, P1B9D, P1B9E, P1B9F, P1BA0, P1BA1, P1BA2, P1BA3, P1BA4, P1BA5, P1BA6, P1BA7, P1BA8, P1BA9 ,P1BAB, P1BAA, P1BAC, P1BAD, P1BAE, P1BAF, P1BB0, P1BB1, P1BB2, P1BB3, P1BB4, P1BB5, P1BB6, P1BB7, P1BB8, P1BB9, P1BBA, P1BBB, P1BBC, P1BBD, P1BBE, P1BBF, P1BC0, P1BC1, P1BC2, P1BC3, P1BC4, P1BC5, P1BC6, P1BC7, P1BC8, P1BC9, P1BCA, P1BCB, P1BCC, P1BCE, P1BCD, P1BCF, P1BD0, P1BD2, P1BD1, P1BD3, P1BD4, P1BD5, P1BD6, P1BD7, P1BD8, P1BD9, P1BDA, P1BDB, P1BDD, P1BDC, P1BDE, P1BDF, P1BE1, P1BE0, P1BE3, P1BE2, P1BE4, P1BE5, P1BE6, P1BE7, P1BE8, P1BE9, P1BEA, P1BEB, P1BEC, P1BED, P1BEE, P1BF0, P1BEF, P1BF1, P1BF2, P1BF4, P1BF3, P1BF5, P1BF4, P1BF7, P1BF8, P1BF9, P1BFA, P1BFB, P1BFC, P1BFD, P1BFE, P1E01, P1E02, P1E03, P1E04, P1E05, P1E06, P1E4C, P1E4D, P1E4E, P1E4F, P1E50, P1E51, P1E52, P1E53, P1E54, P1E55, P1E56, P1E57, P1E58, P1E59, P1E5A, P1E5B, P1E5C, P1E5D, P1E5E, P1E5F, P1E60, P1E62, P1E61, P1E63, P1E64, P1E65, P1E66, P1E67, P1E68, P1E69, P1E6A, P1E6B, P1E6D, P1E6C, P1E6E, P1E6F, P1E70, P1E71, P1E72, P1E73, P1E74, P1E76, P1E75, P1E77, P1E78, P1E79, P1E7A, P1E7B, P1E7C, P1E7D, P1E7E, P1E7F, P1E80, P1E81, P1E82, P1E83, P1E84, P1E85, P1E86, P1E87, P1E88, P1E89, or P1E8A is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If none of the DTCs are set
3. Verify that DTC P1E92, P1E98, P1E9E, or P1EA4 is not set. If DTC P1E92, P1E98, P1E9E, or P1EA4 is set Replace the appropriate K112 Hybrid/EV Battery Interface Control Module. If DTC P1E92, P1E98, P1E9E, or P1EA4 is not set
4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Drive Motor Battery Interface Control Module Replacement (Module 2)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Drive Motor Battery Interface Control Module Replacement (Module 3)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Drive Motor Battery Interface Control Module Replacement (Module 4)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Drive Motor Battery Interface Control Module Replacement (Module 1)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. «Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid/EV interface control modules replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The 2nd protection is a redundant method to monitor cell group overvoltage. The four hybrid/EV battery interface control modules independently read and test each cell group. The 2nd protection circuit fault is the actual hardwire signal from the four hybrid/EV battery interface control modules to the hybrid/EV battery energy control module and terminating in the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 diagnoses this line to determine when a cell group overvoltage condition exists.

The 2nd protection self test diagnostic is used to check the signal circuit. The hybrid/EV battery energy control module performs this test, once, every power down cycle. When run/crank input signal transitions low and after a calibrated delay, the hybrid/EV battery energy control module informs the hybrid/EV powertrain control module 2, via serial data communication bus that it is about to run the diagnostics on the 2nd protection circuit. The hybrid/EV battery energy control module then proceeds to command, via internal serial data, each hybrid/EV battery interface control module to run the check on its hardwire output. Each of the four hybrid/EV battery interface control modules pulls the signal circuit low and releases it, in sequence. If any pulses are missing, the hybrid/EV battery energy control module is able to diagnose which hybrid/EV battery interface control module(s) has a fault, and sets a related fault, and sends this information to the hybrid/EV powertrain control module 2 on the serial data

P1EAB

1. The hybrid/EV battery energy control module and hybrid/EV powertrain control module 2 are awake and communicating.
2. DTC P1EAC or U185A is not set

P1EAC

1. The hybrid/EV battery energy control module and hybrid/EV powertrain control module 2 are awake and communicating.
2. Vehicle must be cycled from Vehicle ON to Vehicle OFF.
3. Vehicle is OFF for 500 ms.
4. The 12 V battery voltage greater than or equal to 9 V.
5. None of the following DTCs are set; P1E8E, P1E94, P1E9A, or P1EA0.
6. No loss of communications between the hybrid/EV battery energy control module and any of the hybrid/EV battery interface control modules.

P1EAB

A cell overvoltage is detected.

P1EAC

The hybrid/EV powertrain control module 2 has detected a fault with the 2nd protection fault flag.

1. DTCs P1EAB and P1EAC are type A DTCs.
2. If any of these DTCs are set, the vehicle will operate in a reduced power mode and electric only engine ON.
3. Once Vehicle Power has been turned OFF all of the contactors will be prevented from closing.

1. DTCs P1EAB and P1EAC are type A DTCs.
2. After the repair for DTC P1EAB, with a scan tool, perform the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) to prevent DTCs from resetting.
3. Vehicle Power cycled from ON to OFF after code clear

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. EL-48900 HEV Safety Kit
2. EL-50211 Low Voltage Jumper Harness Extension

For equivalent regional tools, refer to Special Tools .

1. Vehicle in Service Mode.
2. Verify that DTC P0B3B, P0B3D, P0B3E, P0B40, P0B42, P0B43, P0B45, P0B47, P0B48, P0B4A, P0B4C, P0B4D, P0B4F, P0B51, P0B54, P0B52, P0B56, P0B57, P0B59, P0B5B, P0B5C, P0B5E, P0B60, P0B61, P0B63, P0B65, P0B66, P0B68, P0B6A, P0B6B, P0B6D, P0B6F, P0B70, P0B72, P0B74, P0B75, P0B77, P0B79, P0B7A, P0B7C, P0B7E, P0B7F, P0B81, P0B83, P0B84, P0B86, P0B88, P0B89, P0B8B, P0B8D, P0B8E, P0B90, P0B92, P0B93, P0B95, P0B97, P0B98, P0B9A, P0B9C, P0B9D, P0B9F, P0BA1, P0BA2, P0BA4, P0BA6, P0BA7, P0BA9, P0BAB, P0BAC, P0BAE, P0BB0, P0BB1, P0BB3, P0BB5, P0BB6, P0BB8, P0BBA, P0BBB, P1B17, P1B18, P1B1A, P1B1B, P1B1D, P1B1E, P1B20, P1B21, P1B23, P1B24, P1B26, P1B27, P1B28, P1B29, P1B2A, P1B2B, P1B2C, P1B2D, P1B46, P1B47, P1B4A, P1B4C, P1B4D, P1B4F, P1B50, P1B52, P1B53, P1B55, P1B56, P1B58, P1B59, P1B5B, P1B5C, P1B5E, P1B5F, P1B61, P1B64, P1B62, P1B65, P1B67, P1B68, P1B6A, P1B6B, P1B6D, P1B6E, P1B70, P1B71, P1B73, P1B74, P1B76, P1B77, P1B79, P1B7A, P1B7C, P1B7D, P1B7F, P1B80, P1B82, P1B83, P1B85, P1B86, P1B88, P1B89, P1B8B, P1B8C, P1B8E, P1B8F, P1B91, P1B92, P1B94, P1B95, P1B97, P1B98, P1B9A, P1B9B, P1B9D, P1B9E, P1BA0, P1BA1, P1BA3, P1BA4, P1BA6, P1BA7, P1BA9, P1BAA, P1BAC, P1BAD, P1BAF, P1BB0, P1BB2, P1BB3, P1BB5, P1BB6, P1BB8, P1BB9, P1BBB, P1BBC, P1BBE, P1BBF, P1BC1, P1BC2, P1BC4, P1BC5, P1BC7, P1BC8, P1BCA, P1BCB, P1BCD, P1BCE, P1BD0, P1BD1, P1BD3, P1BD4, P1BD6, P1BD7, P1BD9, P1BDA, P1BDC, P1BDD, P1BDF, P1BE0, P1BE2, P1BE3, P1BE5, P1BE6, P1BE8, P1BE9, P1BEB, P1BEC, P1BEE, P1BEF, P1BF1, P1BF2, P1BF4, P1BF5, P1BF7, P1BF8, P1BFA, P1BFB, P1BFD, P1BFE, P1E02, P1E03, P1E05, P1E06, P1E4C, P1E4D, P1E4E, P1E4F, P1E50, P1E51, P1E52, P1E53, P1E54, P1E55, P1E56, P1E57, P1E58, P1E59, P1E5A, P1E5B, P1E5C, P1E5D, P1E5E, P1E5F, P1E60, P1E61, P1E62, P1E63, P1E64, P1E65, P1E66, P1E67, P1E68, P1E69, P1E6A, P1E6B, P1E6C, P1E6D, P1E6E, P1E6F, P1E70, P1E71, P1E72, P1E73, P1E74, P1E75, P1E76, P1E77, P1E78, P1E79, P1E7A, P1E7B, P1E7C, P1E7D, P1E7E, P1E7F, P1E80, P1E81, P1E82, P1E83, P1E84, P1E85, P1E86, P1E87, P1E88, P1E89, P1E8A, U2603, U2604, U2605, or U2606 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If none of the DTCs are set
3. Verify that DTC P1EAB or P1EAC is not set. If DTC P1EAB or P1EAC is set Refer to Circuit/System Testing If DTC P1EAB or P1EAC is not set
4. All OK.

1. Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. Connect the 12 V battery. Disconnect the X2 harness connector at the A4 Hybrid/EV Battery Pack. Vehicle in Service Mode.
3. Test for 4.8-5.2 V between the signal circuit terminal 6 and ground. If less than 4.8 V Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid Powertrain Control Module 2. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K114B Hybrid Powertrain Control Module 2. After the repair, with a scan tool, perform the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) If 5.2 V or greater Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid Powertrain Control Module 2. After the repair, with a scan tool, perform the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) If between 4.8-5.2 V
4. Vehicle OFF, remove the the A4 Hybrid/EV Battery Pack Cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
5. Connect EL-50211 Low Voltage Jumper Harness Extension. Disconnect the X1 harness connector at the K16 Battery Energy Control Module. Vehicle in Service Mode.
6. Test for 4.8-5.2 V between the signal circuit terminal 21 and ground. If not within the specified range Replace the A28 Hybrid/EV Battery Contactor Assembly. After the repair, with a scan tool, perform the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) If within the specified range
7. Vehicle OFF, connect the X1 harness connector at the K16 Battery Energy Control Module. Disconnect the X1 harness connector at the K112A Hybrid/EV Battery Interface Control Module 1. Vehicle in Service Mode.
8. Test for 4.8-5.2 V between the signal circuit terminal 13 and ground. If less than 4.8 V Vehicle OFF, disconnect the X2 harness connector at the K16 Battery Energy Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K16 Battery Energy Control Module. After the repair, with a scan tool, perform the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) If 5.2 V or greater Vehicle OFF, disconnect the X1 harness connector at the K16 Battery Energy Control Module. Vehicle in Service Mode. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K16 Battery Energy Control Module. After the repair, with a scan tool, perform the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) If between 4.8-5.2 V
9. Vehicle OFF, connect the X1 harness connector at the K112A Hybrid/EV Battery Interface Control Module 1. Disconnect the X1 harness connector at the K112B Hybrid/EV Battery Interface Control Module 2. Vehicle in Service Mode.
10. Test for 4.8-5.2 V between the signal circuit terminal 13 and ground. If less than 4.8 V Vehicle OFF, disconnect the X1 harness connector at the K112A Hybrid/EV Battery Interface Control Module 1. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K112A Hybrid/EV Battery Interface Control Module 1. After the repair, with a scan tool, perform the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) If 5.2 V or greater Vehicle OFF, disconnect the X1 harness connector at the K112A Hybrid/EV Battery Interface Control Module 1. Vehicle in Service Mode. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K112A Hybrid/EV Battery Interface Control Module 1. After the repair, with a scan tool, perform the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) If between 4.8-5.2 V
11. Vehicle OFF, connect the X1 harness connector at the K112B Hybrid/EV Battery Interface Control Module 2. Disconnect the X1 harness connector at the K112C Hybrid/EV Battery Interface Control Module 3. Vehicle in Service Mode.
12. Test for 4.8-5.2 V between the signal circuit terminal 13 and ground. If less than 4.8 V Vehicle OFF, disconnect the X2 harness connector at the K112B Hybrid/EV Battery Interface Control Module 2. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K112B Hybrid/EV Battery Interface Control Module 2. After the repair, with a scan tool, perform the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) If 5.2 V or greater Vehicle OFF, disconnect the X1 harness connector at the K112B Hybrid/EV Battery Interface Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K112B Hybrid/EV Battery Interface Control Module 2. After the repair, with a scan tool, perform the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) If between 4.8-5.2 V
13. Vehicle OFF, connect the X1 harness connector at the K112C Hybrid/EV Battery Interface Control Module 3. Disconnect the X1 harness connector at the K112D Hybrid/EV Battery Interface Control Module 4. Vehicle in Service Mode.
14. Test for 4.8-5.2 V between the signal circuit terminal 13 and ground. If less than 4.8 V Vehicle OFF, disconnect the X2 harness connector at the K112B Hybrid/EV Battery Interface Control Module 3. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K112B Hybrid/EV Battery Interface Control Module 3. After the repair, with a scan tool, perform the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) If 5.2 V or greater Vehicle OFF, disconnect the X1 harness connector at the K112B Hybrid/EV Battery Interface Control Module 3. Vehicle in Service Mode. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K112B Hybrid/EV Battery Interface Control Module 3. After the repair, with a scan tool, perform the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) If between 4.8-5.2 V
15. Replace all of the K112 Hybrid/EV Battery Interface Control Modules. After the repair, with a scan tool, perform the «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs)

Perform the Diagnostic Repair Verification after completing the repair.

1. «Drive Motor Battery Interface Control Module Replacement (Module 2)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Drive Motor Battery Interface Control Module Replacement (Module 3)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Drive Motor Battery Interface Control Module Replacement (Module 4)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «Drive Motor Battery Interface Control Module Replacement (Module 1)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. «Drive Motor Battery Wire Junction Block Relay Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
3. «Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery energy control module, hybrid/EV interface control modules, or hybrid/EV powertrain control module 2 replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV powertrain control module 2 will set DTC P1F17 if the hybrid/EV powertrain control module 1 has detected a passive loss of isolation, the supplemental inflatable restraint sensors are not working or has lost communications with the hybrid/EV powertrain control module 1 and the supplemental inflatable restraint module.

1. Vehicle ON.
2. The 12 V battery voltage is greater than 9 V.

1. P0AA6 is set in the hybrid/EV powertrain control module 1.
2. DTCs B0083-B0088 are set in the supplemental inflatable restraint module. OR
3. P0AA6 is set in the hybrid/EV powertrain control module 1.
4. DTC U184E is set. OR
5. The hybrid/EV powertrain control module 2 has lost communications with the hybrid/EV powertrain control module 1.
6. DTC U184E is set. OR
7. The hybrid/EV powertrain control module 2 has lost communications with the hybrid/EV powertrain control module 1.
8. DTCs B0083-B0088 are set in the supplemental inflatable restraint module.

1. DTC P1F17 is a type A DTC.
2. All of the contactors will be prevented from closing.

1. DTC P1F17 is a type A DTC.
2. The «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) reset function must be performed with a scan tool before clear codes.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Vehicle in Service Mode.
2. Verify that no other DTCs are set. If any other DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If none of the DTCs are set
3. Verify that DTC P1F17 is not set. If DTC P1F17 is set Verify the K36 Inflatable Restraint Sensing And Diagnostic Module is programmed with the correct software calibration. If the correct software is not installed, program the K36 Inflatable Restraint Sensing And Diagnostic Module. If the correct software is installed Perform the «High Voltage System Inspection»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) If the High Voltage System Inspection is not OK, perform the required repairs. If the High Voltage System Inspection is OK Verify that DTC P1F17 does not set while operating the vehicle within the Conditions for Running the DTC. If DTC P1F17 is set, replace the K114B Hybrid Powertrain Control Module 2. If DTC P1F17 is not set All OK. If DTC P1F17 is not set
4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for hybrid/EV powertrain control module 2 and inflatable restraint sensing and diagnostic module replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid system monitors the electrical potential between high voltage and the vehicle chassis. High voltage should always be isolated from the vehicle chassis by a certain amount of resistance to avoid the potential for a life threatening current path. In the event that a high voltage leak path is detected to the vehicle chassis, the hybrid system will set a diagnostic trouble code (DTC). High voltage DC chassis isolation is monitored by the motor control modules and the hybrid/EV powertrain control module 2.

Testing for loss of isolation requires special tools and procedures. Because of the high voltages present in the hybrid system, a loss of isolation may occur due to insulation breakdown. Insulation breakdown typically occurs only when high voltages and/or current is present. Conditions such as insulation breakdown cannot be diagnosed with a typical DMM because high voltage is not used by the DMM when measuring resistance.

The power inverter module contains two motor control modules. Each motor control module measures hybrid battery high voltage with several internal sensors. The motor control modules test for loss of isolation between either the high voltage positive circuit or high voltage negative circuit and vehicle chassis. The motor control modules test for isolation when the high voltage contactor relays are closed. The hybrid/EV powertrain control module 2 only tests the hybrid battery assembly for high voltage loss of isolation when the high voltage contactor relays are open.

Motor control module loss of isolation is detected through the use of two high-impedance resistors and voltage measuring circuitry. The two resistors are connected in series between the high voltage positive and high voltage negative circuits. The center connection of the two resistors is also connected to vehicle chassis. The motor control module then measures the voltage drop across one of the resistors. Without a loss of isolation, the motor control module should measure about half of the high voltage potential. This is referred to as mid-pack voltage. The Mid-pack voltage value is then doubled by the software and displayed on a scan tool as Motor 1 Isolation Voltage or Motor 2 Isolation Voltage. When a loss of isolation is present, the motor isolation voltage display will indicate voltage that is more or less than actual hybrid battery high voltage. The motor control module monitors the loss of isolation voltage measuring circuitry for correct operation.

Schematic Reference

1. «Hybrid/EV Energy Storage Schematics»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. «Hybrid/EV Controls Schematics»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-control-system)

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. EL-48900 HEV Safety Kit
2. EL-50772 Insulation Multimeter

For equivalent regional tools, refer to Special Tools .

1. Vehicle in Service Mode.
2. Verify that DTC P0AA1, P0AD9, P0ADD, P0AE2, P0AE4, P0D0A, P0D11, P1EBC-P1EBF, P1EC0, or P1EC3-P1EC5 is not set. If any DTC is set Refer to «DTC P0AA1, P0AD9, P0ADD, P0AE2, P0AE4, P0D0A, P0D11, P1EBC-P1EBF, P1EC0, or P1EC3-P1EC5»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) If none of the DTCs are set
3. Vehicle OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
4. Test for greater than 750k ohms between the circuit terminals listed below and ground, using the EL-50772 Insulation Multimeter : A4 Hybrid/EV Battery Pack harness connector terminal A +300 V X4. A4 Hybrid/EV Battery Pack harness connector terminal B -300 V X4. If 750k ohms or less Disconnect the X1 connector at the K1 14 V Power Module. Test for greater than 750k ohms between the circuit terminal and ground. If 750k ohms or less, replace the 300 V DC cables. If greater than 750k ohms, replace the K1 14 V Power Module. If greater than 750k ohms
5. Test for greater than 750k ohms between the circuit terminals listed below and ground: T6 Power Inverter Module harness connector terminal 1 -300 V X3. T6 Power Inverter Module harness connector terminal 2 +300 V X3. If 750k ohms or less Replace the 300 V DC cables. If greater than 750k ohms
6. Disconnect the X4 harness connector at the T6 Power Inverter Module.
7. Test for greater than 750k ohms between the circuit terminals listed below and ground: Terminal A +300 V X4. Terminal B -300 V X4. If 750k ohms or less Disconnect the X2 connector at the G1 A/C Compressor. Test for greater than 750k ohms between the circuit terminal and ground. If greater than 750k ohms, replace the G1 A/C Compressor. If 750k ohms or less Disconnect the X2 connector at the K10 Cabin Heater Control Module. Test for greater than 750k ohms between the circuit terminal and ground. If greater than 750k ohms, replace the K10 Cabin Heater Control Module. If 750k ohms or less, replace the 300 V DC cables. If greater than 750k ohms
8. Disconnect the X5 harness connector at the at the T6 Power Inverter Module.
9. Test for greater than 750k ohms between the 3 phase cable circuit terminals listed below and ground: Terminal 1 300 V X5. Terminal 2 300 V X5. Terminal 3 300 V X5. If 750k ohms or less Disconnect the X2, X3, and X4 connector at the M15A Drive Motor 1. Test for greater than 750k ohms between the circuit terminal and ground If greater than 750k ohms, replace the M15A Drive Motor 1. If 750k ohms or less, replace the 300 V DC cables. If greater than 750k ohms
10. Disconnect the X6 harness connector at the at the T6 Power Inverter Module.
11. Test for greater than 750k ohms between the 3 phase cable circuit terminals listed below and ground: Terminal 1 300 V X6. Terminal 2 300 V X6. Terminal 3 300 V X6. If 750k ohms or less Disconnect the X2, X3, and X4 connector at the M15B Drive Motor 2. Test for greater than 750k ohms between the circuit terminal and ground If greater than 750k ohms, replace the M15B Drive Motor 2. If 750k ohms or less, replace the 300 V DC cables. If greater than 750k ohms
12. Disconnect the X8 harness connector at the at the T6 Power Inverter Module.
13. Test for greater than 1.0M ohms between the 3 phase cable circuit terminals listed below and ground: Terminal 1 300 V X8. Terminal 2 300 V X8. Terminal 3 300 V X8. If 750k ohms or less Replace the G5 Transmission Fluid Pump - Auxiliary. If greater than 750k ohms
14. Test for greater than 750k ohms between the T6 Power Inverter Module circuit terminals listed below and ground: Terminal A +300 V X3. Terminal B -300 V X3. Terminal A +300 V X4. Terminal B -300 V X4. Terminal 1 300 V X5. Terminal 2 300 V X5. Terminal 3 300 V X5. Terminal 1 300 V X6. Terminal 2 300 V X6. Terminal 3 300 V X6. Terminal 1 300 V X8. Terminal 2 300 V X8. Terminal 3 300 V X8. If 750k ohms or less Replace the T6 Power Inverter Module. If greater than 750k ohms
15. Remove the Drive Motor Battery Cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
16. Disconnect the harness connector at the E54 Hybrid/EV Battery Pack Coolant Heater.
17. Test for 61-75 ohms between terminal A and terminal B at the E54 Hybrid/EV Battery Pack Coolant Heater. If not within the specified range Verify that the charger maxi-fuse is not blown. Replace the charger maxi-fuse if it is blown and the E54 Hybrid/EV Battery Pack Coolant Heater. If within the specified range
18. With the EL-50772 , set on the Isolation test setting, test for 550M ohms between the E54 hybrid/EV battery pack coolant heater terminals listed below and battery tray ground: Terminal A Terminal B If less than 550M ohms Verify that the charger maxi-fuse is not blown. Replace the charger maxi-fuse if it is blown and the E54 Hybrid/EV Battery Pack Coolant Heater. If 550M ohms or greater
19. Replace the T6 Power Inverter Module.
20. Verify that DTC P1AF0, P1AF2, P1AF4-P1AF7, P1B0B, P1B0C, P1B41, P1B42, P1E22, or P1E1B-P1E1F does not set while operating the vehicle within the Conditions for Running the DTC. If any DTC is set Replace the A4 Hybrid/EV Battery Pack. If none of the DTCs are set
21. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping)
2. «300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-APM Module)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «300-Volt Battery Positive and Negative Cable Replacement (Inverter-to-Compressor/Heater Module)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-Charger)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , «300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-Inverter)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
3. «Air Conditioning and Drive Motor Battery Cooling Compressor Replacement»(/cadillac/elr/i-2013-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
4. «Heater Coolant Heater Replacement»(/cadillac/elr/i-2013-2015/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
5. «Accessory DC Power Control Module Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-control-system)
6. «Generator Rotor and Stator Removal - Unit A»(/cadillac/elr/i-2013-2015/remont/automatic-trans/#automatic-transmission-4et50-repair-instructions-off-vehicle)
7. «Drive Motor Generator Rotor, Stator, and Output Sun Gear Shaft Removal - Unit B»(/cadillac/elr/i-2013-2015/remont/automatic-trans/#automatic-transmission-4et50-repair-instructions-off-vehicle)
8. «Auxiliary Fluid Pump Motor and Fluid Pump Disassemble»(/cadillac/elr/i-2013-2015/remont/automatic-trans/#automatic-transmission-4et50-repair-instructions-off-vehicle)
9. «Battery Heater Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system)
10. «Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for the T6 power inverter module replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid/EV battery contains 5 high voltage contactors and 2 transistors. The high voltage contactors and transistors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the hybrid/EV battery assembly. The 5 high voltage contactors consist of a main positive high voltage contactor, main negative high voltage contactor, charge positive high voltage contactor, charge negative high voltage contactor, and multi-function high voltage contactor. The 2 transistors consist of the precharge transistor and heater transistor. The contactors and transistors close and open in a specific sequence controlled by the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 supplies voltage to the control circuit for the high voltage contactors/transistors. Ground is provided through the case ground.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. EL-48900 HEV Safety Kit
2. EL-50209 High Voltage Terminal Cover

For equivalent regional tools, refer to Special Tools .

1. Review the high voltage safety information prior to performing the High Voltage Disabling procedure. Refer to «High Voltage Safety»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. Verify the Servicing the A4 Hybrid/EV Battery Pack or 360 V DC Cables procedure has been performed. The procedure has not been performed Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) before continuing to the next step. The procedure has been performed
3. Disconnect the X1 (1) and X2 (2) harness connectors at the A4 Hybrid/EV Battery Pack. Connect the 12 V battery. Vehicle in Service Mode.
4. Test for less than 9.5 V at the following points and ground: Terminal 2 X1. Terminal 4 X1. Terminal 6 X1. Terminal 7 X1. Terminal 9 X1. Terminal 11 X1. If 9.5 V or greater Vehicle OFF, disconnect the X1 harness connector at the K114B Hybrid Powertrain Control Module 2. Vehicle in Service Mode. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K114B Hybrid Powertrain Control Module 2. If less than 9.5 V
5. Vehicle OFF.
6. Test for infinite resistance between control circuit terminal 2 X2 harness connector at the A4 Hybrid/EV Battery Pack and ground. If less than infinite resistance Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid Powertrain Control Module 2. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K114B Hybrid Powertrain Control Module 2. If infinite resistance
7. Test the DMM by measuring a 12 V battery. If the DMM does not properly measure a 12 V battery Repair or replace the DMM and repeat all voltage measurements. If the DMM does properly measure a 12 V battery
8. Disconnect the high voltage interlock harness connectors listed below at the A4 Hybrid/EV Battery Pack, if not already disconnected. F118 (6) hybrid battery pack connector jumper connector. X6 (7) 14 V power module jumper connector. X7 (8) battery charger jumper connector.
9. Disconnect the X4 (4) harness connector at the A4 Hybrid/EV Battery Pack.
10. Verify the voltage measures less than 3 V at the X4 harness connector at the A4 Hybrid/EV Battery Pack at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
11. Disconnect the X5 (5) harness connector at the A4 Hybrid/EV Battery Pack.
12. Verify the voltage measures less than 3 V at the X5 harness connector at the following points: High voltage DC (-360 V) negative terminal B to vehicle chassis ground. High voltage DC (+360 V) positive terminal A to vehicle chassis ground. High voltage DC (+360 V) positive terminal A and high voltage DC (-360 V) negative terminal B. If 3 V or greater Leave the DMM connected to the terminals until the voltage drops below 3 V to allow the high voltage capacitors to discharge. Continue to the next step once the voltage is below 3 V. If less than 3 V
13. Disconnect the X3 (3) harness connector at the A4 Hybrid/EV Battery Pack.
14. Install the EL-50209. Lower the battery from the vehicle with the EL-50209 installed. Refer to «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping)
15. Replace the A4 Hybrid/EV Battery Pack. There is a stuck closed contactor and a loss of isolation within the A4 Hybrid/EV Battery Pack.

Perform the Diagnostic Repair Verification after completing the repair.

Drive Motor Battery Replacement and Shipping Preparation

Rechargeable Energy Storage System Smoke Test

Special Tools

1. EL-50812 Volt Battery Smoke Test Leak Adapters
2. GE 41413-A Evaporative Emissions System Tester (EEST)

For equivalent regional tools, refer to Special Tools .

1. Remove the rechargeable energy storage system (RESS) from the vehicle. Refer to «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping) .
2. Install the EL-50812 Volt battery smoke test leak adapters to all of the RESS electrical connectors (X1 through X7). Tighten the fastener to 9 (80 lb in).
3. Reinstall the S15 manual service disconnect lever or seal the drive motor generator battery high voltage manual disconnect connector, using duct tape.
4. Cover all gore patches (1,2 and 3) with duct tape.
5. Create a small hole through the duct tape and vent patch (2) to allow a full soak of the smoke into the RESS.
6. Turn OFF any fans that may cause air movement around or near the RESS.
7. Install the tester hose (1) to the RESS adapter
8. Turn the nitrogen/smoke valve on the control panel to smoke.
9. Press and release the remote switch to activate the tester and inject smoke into the RESS.
10. Soak/Fill the RESS with smoke for TWO MINUTES until smoke is observed from the hole in vent (2).
11. Once smoke in observed from the hole, press and release the remote switch to deactivate the tester to relieve the pressure within the RESS.
12. Seal the hole in vent (2) with duct tape.
13. Introduce smoke into the RESS for THREE MINUTES. Using a high-intensity white light, look for any visible smoke emitting anywhere from the RESS.
14. Press and release the remote switch to deactivate the tester.
15. Repair any visible leaks by retightening the fasteners or by resealing any areas using butyl sealant.
16. Retest the RESS, to ensure repair has been completed.
17. Remove the duct tape from the gore patches (1,2 and 3).
18. Remove the duct tape from rear vent (2).
19. Open the nitrogen tank valve and turn the nitrogen/smoke valve on the control panel to Nitrogen.
20. Press and release the remote switch to activate the tester and inject nitrogen into the RESS for FIVE MINUTES, verify no smoke is coming from the vent.
21. Remove all old vents from the RESS.
22. Install NEW Gore patches (P/N 20791600), replacing the old vents.
23. Disconnect the tester and remove the adapters from the RESS.
24. Remove the S15 manual service disconnect lever or the duct tape used to seal the S15 manual service disconnect connector.
25. Install the rechargeable energy storage system (RESS) in the vehicle. Refer to «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping) .

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Vehicle Collision Detection

The supplemental inflatable restraint system supplements the protection offered by the seat belts. The supplemental inflatable restraint system contains an inflatable restraint sensing and diagnostic module, air bags, seat belt pretensioners (anchor and retractor), and impact sensors. The sensing and diagnostic module determines the severity of a collision with the assistance of impact sensors located at strategic points on the vehicle. When the sensing and diagnostic module detects a collision, the sensing and diagnostic module will process the information provided by the impact sensors to further support air bag or pretensioner deployment. The sensing and diagnostic module will deploy the air bags and pretensioners if it detects a collision of sufficient force. If the force of the impact is not sufficient to warrant air bag deployment, the sensing and diagnostic module may still deploy the seat belt pretensioners. The hybrid powertrain control module 2 will open the high voltage contactor relays and disable the vehicle whenever an supplemental inflatable restraint deployment occurs.

The supplemental inflatable restraint module transmits through serial data to the hybrid powertrain control module 2 whenever a sensor fault is detected or a collision event has been detected. The hybrid powertrain control module 2 will set a Crash Event Detected event and enter into a disable condition.

A complete inspection of the high voltage system and components must be performed if the vehicle has been involved in a collision. The Crash Event Detected condition will remain active until cleared by the hybrid powertrain control module 2 Clear Secured High Voltage DTCs output control function of the scan tool.

Schematic Reference

1. «Hybrid/EV Energy Storage Schematics»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system)
2. «Hybrid/EV Controls Schematics»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-control-system)
3. «Plug-In Charging Schematics»(/cadillac/elr/i-2013-2015/remont/body-electrical/#plug-in-charging)

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. EL-48900 HEV Safety Kit
2. EL-50211 Low Voltage Jumper Harness Extension

For equivalent regional tools, refer to Special Tools .

Inspection Procedure

1. Vehicle OFF.
2. Verify that the vehicle involved in a collision with body damage is repairable. WARNING: Damage to a Lithium Ion hybrid/EV battery pack could result in fire, loss of electrical isolation or exposure to high voltage. Store the vehicle with hybrid/EV battery pack installed or the hybrid/EV battery pack assembly outside in a secure area away from buildings and other vehicles and protected from rain, snow and other moisture until the hybrid/EV battery pack has been discharged. Remove the hybrid/EV battery pack high voltage manual disconnect lever and store it in a secure place outside the vehicle. Cover the exposed high voltage opening with UL® listed, or equivalent, insulation tape rated at a minimum of 600 V. Contact the GM Technical Assistance Center for discharge instructions prior to storage and shipping of the hybrid/EV battery pack. Failure to follow these precautions could result in personal injury, death and property damage. If vehicle damage does not allow for repair Remove the A4 Hybrid/EV Battery Pack from the vehicle. Refer to «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping) . Contact the GM Technical Assistance Center for recycling information after discharging the A4 Hybrid/EV Battery Pack. If vehicle damage does allow for repair
3. Perform the Repairs and Inspections Required after a Collision. Refer to «Repairs and Inspections Required After a Collision»(/cadillac/elr/i-2013-2015/remont/airbag/#supplemental-inflatable-restraint-system) . Continue High Voltage System Inspection, after Repairs and Inspections Required after a Collision has been performed. If repairs are required for the air bags or seat belts Refer to Air Bags Deployed Inspection. If repairs are not required for the air bags or seat belts
4. Verify that the vehicle does not have right front damage. If the vehicle has right front damage Perform the high voltage disable procedure at the T18 Battery Charger. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) Perform a visual inspection of the T18 Battery Charger. Remove any covers or shields to gain access. Inspect the assembly for cracks, dents, pinched, cut or frayed high voltage DC 300V cables, low voltage cables or other physical damage. Continue High Voltage System Inspection after repairs. If the vehicle does not have right front damage
5. Vehicle OFF, perform a visual inspection of the following high voltage components listed. Remove any covers or shields to gain access. Inspect the assembly for cracks, dents, pinched, cut or frayed high voltage DC 300V cables, low voltage cables or other physical damage. A4 hybrid/EV battery pack. (exterior only - includes tray and A28 hybrid/EV battery contactor assembly) T18 battery charger. (If not done in previous step.) G1 air conditioning compressor. K10 coolant heater control module. K1 14 V accessory power module. T6 power inverter module . T12 automatic transmission assembly. The high voltage DC 300V cable between the A4 hybrid/EV battery pack and the T18 battery charger. The high voltage DC 300V cable between the T6 power inverter module and the A4 hybrid/EV battery pack. The high voltage DC 300V cable between the T6 power inverter module and the G1 air conditioning compressor. The high voltage DC 300V cable between the T6 power inverter module and the K10 coolant heater control module. The high voltage DC 300V cable between the T6 power inverter module and the K1 14 V accessory power module. The high voltage DC 300V cable between the T6 power inverter module and the K107A drive motor 1 control module. The high voltage DC 300V cable between the T6 power inverter module and the K107B drive motor 2 control module. The high voltage DC 300V cable between the T6 power inverter module and the K6 transmission fluid pump control module-auxiliary. If physical damage is observed Perform the appropriate high voltage disable procedure. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) Replace all components and cables identified as damaged. Continue High Voltage System Inspection after repairs. If physical damage is not observed
6. Vehicle in Service Mode.
7. Verify that no DTCs are set. If any DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) Continue High Voltage System Inspection after repairs. If no DTCs are set
8. With a scan tool, clear the hybrid/EV powertrain control module 2 Crash Event Detected, disable condition only after all high voltage components identified as damaged have been replaced. Refer to «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs)
9. Perform the required body repairs per the approved service procedures.

Air Bags Deployed Inspection

1. Perform the high voltage disable procedure at the A4 Hybrid/EV Battery Pack. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) , . If vehicle damage does not allow for access to the S15 Manual Service Disconnect, disconnect the 12 V battery and remove the damaged portion of the vehicle until such time as the S15 Manual Service Disconnect can be removed and the «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) procedure can be completed.
2. Remove the A4 Hybrid/EV Battery Pack from the vehicle. Refer to «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping)
3. Perform a visual inspection of the A4 Hybrid/EV Battery Pack for cracks, dents or other physical external damage. If physical damage is observed Replace all components identified as damaged. Continue to next step after repairs. If no physical damage is observed
4. Perform a visual inspection of the following high voltage components listed. Remove any covers or shields to gain access. Inspect the assembly for cracks, dents, pinched, cut or frayed high voltage DC 300V cables, low voltage cables or other physical damage. T18 battery charger. G1 air conditioning compressor. K10 coolant heater control module. K1 14 V accessory power module. T6 power inverter module . T12 automatic transmission assembly. The high voltage DC 300V cable between the A4 hybrid/EV battery pack and the T18 battery charger. The high voltage DC 300V cable between the T6 power inverter module and the A4 hybrid/EV battery pack. The high voltage DC 300V cable between the T6 power inverter module and the G1 air conditioning compressor. The high voltage DC 300V cable between the T6 power inverter module and the K10 coolant heater control module. The high voltage DC 300V cable between the T6 power inverter module and the K1 14 V accessory power module. The high voltage DC 300V cable between the T6 power inverter module and the K107A drive motor 1 control module. The high voltage DC 300V cable between the T6 power inverter module and the K107B drive motor 2 control module. The high voltage DC 300V cable between the T6 power inverter module and the K6 transmission fluid pump control module-auxiliary. If physical damage is observed Perform the appropriate high voltage disable procedure. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) Replace all components and cables identified as damaged. Continue High Voltage System Inspection after repairs. If physical damage is not observed
5. Install the EL-50211 Low Voltage Jumper Harness Extension. Connect the 12 V battery. Vehicle in Service Mode.
6. Verify that no DTCs are set. If any DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If no DTCs are set
7. Perform the required body repairs per the approved service procedures.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for module replacement, programming and setup.

Removal Procedure

1. Disable the high voltage system. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
2. Remove the multiuse relay and fuse cover screws (1) from the drive motor battery.
3. Remove the multiuse relay and fuse cover (2).
4. Remove the battery protector (Insulator) (1) .
5. Remove the 14 V power module 20 amp maxi-fuse (2).
6. Remove the battery charger 20 amp maxi-fuse (3).

Installation Procedure

1. Install the 14 V power module 20 amp maxi-fuse (2).
2. Install the battery charger 20 amp maxi-fuse (3).
3. Install the battery protector (Insulator) (1) .
4. Install the multiuse relay and fuse cover (2) with screws (1). Tighten to 1.5 (13 lb in).

Drive Motor Battery High Voltage Manual Disconnect Lever Replacement

1. Remove the front floor console rear trim panel. Refer to «Front Floor Console Rear Trim Panel Replacement»(/cadillac/elr/i-2013-2015/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .
2. Push the locking tab (4) to release the hook (2) from the retainer (3).
3. Pull the MSD (1) in arrow direction until it stops.
4. Push again the locking tab (4) to release the hook (2) from the retainer (3).
5. Remove the MSD (1) in arrow direction.

1. Install the MSD (2) to the drive motor battery connector opening (1).
2. Push the MSD until the hook (3) lock into the second retainer (4).
3. Install the front floor console rear trim panel. Refer to «Front Floor Console Rear Trim Panel Replacement»(/cadillac/elr/i-2013-2015/remont/exteriorinterior-trim/#instrument-panel-trim-and-console-trim) .

Scheme 62

Drive Motor Generator Battery High Voltage Manual Disconnect Connector Replacement

Scheme 63

Underbody Air Deflector Replacement

1. Disable the high voltage system. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
2. Remove the drive motor battery. Refer to «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping) .
3. Remove the battery cover fasteners (1).
4. Remove the battery cover fasteners (1).
5. Insert fingers at the 2 corners where the BBDU (Relay assembly), tray and cover meet. Gently lift the front cover up, off the BBDU assembly.
6. Remove the battery cover (1).

1. Perform the hybrid EV battery system verification. Refer to «Hybrid/EV Battery System Verification»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
2. Replace the butyl tape at the cover, tray and BBDU assembly and where fingers were inserted to remove the cover.
3. Install the battery cover (1) by aligning the MSD housing opening with the base (connector) and gently push the front of the cover down against the BBDU assembly.
4. Clean all cover fasteners (1) and apply butyl tape to the bottom of the fasteners. Tighten to 9 (80 lb in).
5. Clean all cover fasteners (1) and apply a medium strength thread-locker to the threads.
6. Tighten the cover fasteners in the following above sequence to 9 (80 lb in).
7. Perform a smoke test on the rechargeable energy storage system. Refer to «Rechargeable Energy Storage System Smoke Test»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__rechargeable-energy-storage-system-smoke-test) .
8. Install the drive motor battery. Refer to «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping) .
9. Enable the high voltage system. Refer to «High Voltage Enabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .

Scheme 64

Battery Cover Seal Replacement (Cover)

Scheme 65

Battery Cover Seal Replacement (Junction Block Relay)

Scheme 66

Battery Energy Control Module Replacement

1. Disable the high voltage system. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
2. Remove the air cleaner resonator outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/elr/i-2013-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luu-repair-instructions) .
3. Remove the throttle body. Refer to «Throttle Body Assembly Replacement»(/cadillac/elr/i-2013-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luu-repair-instructions) .
4. Remove the inverter to compressor/heater module cable (1) from the power inverter module (2).
5. Locate the connectors (1) to the heater coolant heater module .
6. Detach the high voltage inter-lock loop connector (1) and the 300V battery positive and negative cable (2), from the heater coolant heater module (3).
7. Disconnect the 300V battery positive and negative cable retainers (1) from the A/C compressor hose.
8. Remove the 300V battery positive and negative cable (1) from the vehicle.

1. Position the 300V battery positive and negative cable (1) in the engine compartment.
2. Connect the 300V battery positive and negative cable connector (2) to the heater coolant heater module (3).
3. Connect the high voltage inter-lock loop connector (1) to the heater coolant heater module (3).
4. Install the 300V battery positive and negative cable retainers (1) to the A/C compressor hose.
5. Install the 300V battery positive and negative connector (2) to the A/C and drive motor battery cooling compressor.
6. Connect the 300V battery positive and negative cable retainers (1) to the A/C compressor hose.
7. Connect the 300V battery positive and negative cable connector (1) to the drive motor generator power inverter module. Tighten to 8 (71 lb in).
8. Install the throttle body. Refer to «Throttle Body Assembly Replacement»(/cadillac/elr/i-2013-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luu-repair-instructions) .
9. Install the air cleaner resonator outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/elr/i-2013-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luu-repair-instructions) .
10. Enable the high voltage system. Refer to «High Voltage Enabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .

1. Disable the high voltage system. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
2. Remove the drive motor battery. Refer to «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping) .
3. Support the fuel tank with an appropriate jack.
4. Remove the nuts (1) and the bolts (2) securing the floor panel bar (3) to the frame.
5. Remove the floor panel bar (3).
6. Remove the 300V battery positive/negative cable retainer nut (1).
7. Detach the 300V battery positive/negative cable (3) from the fuel rail fasteners (1).
8. Swing the individual fuel line clips (2) open.
9. Working towards the rear of the vehicle, detach the fuel line clip (1) and cables ties (2).
10. Unclip the fuel line clip (1) and the cable ties (2).
11. Disconnect the high voltage inter-lock loop connector (1) and the 300V battery positive/negative cable connector (2).
12. Remove the 300V battery positive/negative cable fastener nut (3).
13. Remove the 300V battery positive/negative cable (1) from the vehicle.

1. Position the 300V battery positive/negative cable (1) below the vehicle.
2. Connect the 300V battery positive/negative retainer and nut (3) to the bracket stud. Tighten to 8 (71 lb in).
3. Connect the 300V battery positive/negative cable connector (2) to the accessory DC power control module.
4. Connect the high voltage inter-lock loop connector (1) to the accessory DC power control module.
5. Install the 300V battery positive/negative cable into the fuel line retainer with clip (1).
6. Install the 300V battery positive/negative cable into the fuel line retainer with clip (1).
7. Install the floor panel bar (3) to the frame mounts. Tighten the following: Floor panel bar nuts (1) to 22 (16 lb ft). Floor panel bar bolts (2) to 58 (43 lb ft).
8. Connect the 300V battery positive/negative cable into the fuel line retainer clips (1).
9. Install the drive motor battery. Refer to «Drive Motor Battery Replacement and Shipping Preparation»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__drive-motor-battery-replacement-and-shipping) .
10. Install the 300V battery positive/negative cable retainer to the stud and tighten nut (1) to 8 (71 lb in).
11. Connect the 300V battery positive/negative cable connector (3) to the drive motor battery (3).
12. Connect the high voltage inter-lock loop connector (1).
13. Connect the high voltage inter-lock loop connector (1).
14. Install the connector (3) and tighten the bolt (1) to 8 (71 lb in).
15. Connect the drive motor battery coolant cooler inlet hose fitting (1).
16. Fill the drive motor battery cooling system. Refer to «Drive Motor Battery Cooling System Draining and Filling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__drive-motor-battery-cooling-system-draining) .
17. Enable the high voltage system. Refer to «High Voltage Enabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
18. Clear the secure high voltage DTCs. Refer to «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) .
19. Perform a Hybrid/EV battery pack capacity learn procedure. Refer to «Hybrid/EV Battery Pack Capacity Learn»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__hybridev-battery-pack-capacity-learn) .

1. Disable the high voltage system. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
2. Remove the drivetrain and front suspension frame. Refer to «Drivetrain and Front Suspension Frame Replacement»(/cadillac/elr/i-2013-2015/remont/frames-subframes-crossmembers/#frame-and-underbody) .
3. Remove the drive motor battery coolant cooler inlet hose asembly. Refer to «Drive Motor Battery Coolant Cooler Inlet Hose Assembly Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__drive-motor-battery-coolant-cooler-inlet) .
4. Disconnect the high voltage inter-lock loop connector (3) from the drive motor battery charger.
5. Remove the 300V battery positive/negative cable retaining nut (1) and the 300V battery positive/negative connector (2).
6. Remove the 300V battery positive/negative cable retainer nut (1) from the underbody stud.
7. Remove the 300V battery positive/negative cable retainer nuts (1) from the chassis frame.
8. Remove the drive motor battery coolant cooler inlet hose fitting (1) and set aside the drive motor battery coolant cooler hose (2).
9. Remove the drive motor battery coolant cooler outlet hose, if necessary. Refer to «Drive Motor Battery Coolant Cooler Outlet Hose Replacement (Battery Outlet to Valve)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system) .
10. Remove the high voltage inter-lock loop connector (1).
11. Remove the bolt (2) and set aside the connector (3).
12. Remove the high voltage inter-lock loop connector (2) and the 300V battery positive/negative connector (1), from the drive motor battery.
13. Remove the 300V battery positive/negative cable from the vehicle.

1. Connect the 300V battery positive/negative cable connector (1) and the high voltage inter-lock loop connector (2), to the drive motor battery.
2. Install the drive motor battery coolant cooler outlet hose, if necessary. Refer to «Drive Motor Battery Coolant Cooler Outlet Hose Replacement (Battery Outlet to Valve)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system) .
3. Connect the high voltage connector (3) and tighten bolt (2) to 8 (71 lb in).
4. Install the drive motor battery coolant cooler inlet hose fitting (1).
5. Install the 300V battery positive/negative retainers (2) and nuts (1) to the chassis frame studs, and tighten to 8 (71 lb in).
6. Connect the 300V battery positive/negative cable retainer (2) and nut (1), to the panel stud, and tighten to 8 (71 lb in).
7. Install the 300V battery positive/negative cable into the fuel line retainer with clip (1).
8. Connect the 300V battery positive/negative cable connector (2) and the high voltage inter-lock loop connector (3), to the drive motor battery charger.
9. Install the 300V battery positive/negative cable retainer (4) and nut (1), and tighten to 8 (71 lb in).
10. Install the 300V battery positive/negative cable retainer to the stud and tighten nut (1) to 8 (71 lb in).
11. Install the drive motor battery coolant cooler inlet hose asembly. Refer to «Drive Motor Battery Coolant Cooler Inlet Hose Assembly Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__drive-motor-battery-coolant-cooler-inlet) .
12. Install the drivetrain and front suspension frame. Refer to «Drivetrain and Front Suspension Frame Replacement»(/cadillac/elr/i-2013-2015/remont/frames-subframes-crossmembers/#frame-and-underbody) .
13. Enable the high voltage system. Refer to «High Voltage Enabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .

1. Disable the high voltage system. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
2. Remove the air cleaner resonator outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/elr/i-2013-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luu-repair-instructions) .
3. Remove the exhaust pipe front heat shield. Refer to «Exhaust Pipe Heat Shield Replacement (Front)»(/cadillac/elr/i-2013-2015/remont/exhaust/#engine-exhaust-system) .
4. Remove the bolt (2) holding the 300V battery positive and negative cable connector (1), to the drive motor generator power inverter module.
5. Drain the drive motor battery cooling system. Refer to «Drive Motor Battery Cooling System Draining and Filling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__drive-motor-battery-cooling-system-draining) .
6. Remove the drive motor battery coolant cooler inlet hose fitting (1) and set aside the drive motor battery coolant cooler hose (2).
7. Remove the drive motor battery coolant cooler outlet hose fitting and set aside the drive motor battery coolant cooler hose. Refer to «Drive Motor Battery Coolant Cooler Outlet Hose Replacement (Battery Outlet to Valve)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system) .
8. Remove the high voltage interlock loop connector (1) and the bolt (2) holding the connector (3) to the drive motor battery.
9. Disconnect the 300V battery positive and negative cable retainers (1) from the studs.
10. Remove the 300V battery positive and negative cable retainers (2) from the heater coolant shut-off valve bracket (1).
11. Remove the 300V battery positive and negative cable (1) from the vehicle.

1. Position the 300V battery positive and negative cable (1) in the engine compartment.
2. Connect the 300V battery positive and negative cable retainers (2) to the heater coolant shut-off valve bracket (1).
3. Install the 300V battery positive and negative cable retainers (1) to the tunnel studs.
4. Install the 300V battery positive and negative connector bolt (2) and tighten to 8 (71 lb in).
5. Connect the high voltage interlock loop connector (1) to the 300V battery positive and negative cable connector (3).
6. Install the drive motor battery coolant cooler outlet hose fitting. Refer to «Drive Motor Battery Coolant Cooler Outlet Hose Replacement (Battery Outlet to Valve)»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system) .
7. Install the drive motor battery coolant cooler inlet hose fitting (1).
8. Install the air cleaner resonator outlet duct. Refer to «Air Cleaner Resonator Outlet Duct Replacement»(/cadillac/elr/i-2013-2015/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luu-repair-instructions) .
9. Fill the drive motor battery cooling system. Refer to «Drive Motor Battery Cooling System Draining and Filling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__drive-motor-battery-cooling-system-draining) .
10. Enable the high voltage system. Refer to «High Voltage Enabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .

Scheme 67

Battery Energy Control Module Wiring Harness Replacement

Cell Battery Replacement (Section 1)

Special Tools

1. EL 48264 Battery Pack Lifting Adapter
2. EL 50115 Battery Section Lifting Adapters
3. EL 50325 High Voltage Battery Terminal Covers

For equivalent regional tools, refer to Special Tools .

1. Disable the high voltage system. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
2. Remove the drive motor battery junction block relay. Refer to «Drive Motor Battery Wire Junction Block Relay Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
3. Remove the bus bar fasteners (1) and battery cable (2).
4. Disconnect the electrical connectors and remove the battery energy control module wiring harness (1).
5. Remove the current sensor fasteners (1) and the current sensor (2).
6. Remove the bus bar fastener (1) and bus bar (2).
7. Remove the auxiliary battery wiring harness (1).
8. Remove the battery interface control module (1).
9. Install the EL 50325 High Voltage Battery Terminal Cover.
10. Loosen the hose clamps (1).
11. Remove the hold down fasteners (2) and battery hold down (3).
12. Trace the position of the battery cell on the battery tray using a paint pen or permanent marker.
13. Using the EL 50115 Battery Section Lifting Adapters along with the EL 48264 Battery Pack Lifting Adapter , remove the battery section (4).

1. Position the battery cell (4) on the trace markings inscribed from the battery cell removal step.
2. Install the battery hold down (3) and tighten the hold down fasteners (2) to 9 (80 lb in).
3. Tighten the hose clamps (1) to 2 (18 lb in).
4. Remove the EL 50325 High Voltage Battery Terminal Cover
5. Install the battery interface control module (1).
6. Install the auxiliary battery wiring harness (1).
7. Install the bus bar (2) and tighten the bus bar fastener (1) to 9 (80 lb in).
8. Install the current sensor (2) and tighten the current sensor fasteners (1) to 9 (80 lb in).
9. Install the battery energy control module wiring harness (1) and connect the electrical connectors.
10. Install the battery cable (2) and tighten the bus bar fasteners (1) to 9 (80 lb in).
11. Install the drive motor battery junction block relay. Refer to «Drive Motor Battery Wire Junction Block Relay Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
12. Perform the hybrid battery pack coolant passage leak test. Refer to «Hybrid Battery Pack Coolant Passage Leak Test»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybrid-battery-pack-coolant-passage-leak) .
13. Perform the cell battery balancing (Section 1). Refer to «Hybrid/EV Battery Cell Balancing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
14. Enable the high voltage system. Refer to «High Voltage Enabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .

Cell Battery Replacement (Section 2)

Special Tools

1. EL 48264 Battery Pack Lifting Adapter
2. EL 50115 Battery Section Lifting Adapters
3. EL 50325 High Voltage Battery Terminal Covers

For equivalent regional tools, refer to Special Tools .

1. Disable the high voltage system. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
2. Remove the drive motor battery cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
3. Remove the bus bar fasteners (1) and battery cable (2).
4. Disconnect the electrical connectors and remove the battery energy control module wiring harness (1).
5. Remove the current sensor fasteners (1) and the current sensor (2).
6. Remove the connector housing fasteners (1) and housing (2).
7. Remove the bus bar fasteners (1) and battery cable (2).
8. Remove the auxiliary battery wiring harness (1).
9. Remove the battery interface control module (1).
10. Install the EL 50325 High Voltage Battery Terminal Cover.
11. Loosen the hose clamps (1).
12. Remove the hold down fasteners (2) and battery hold down (3).
13. Trace the position of the battery cell on the battery tray using a paint pen or permanent marker.
14. Using the EL 50115 Battery Section Lifting Adapters along with the EL 48264 Battery Pack Lifting Adapter , remove the battery section (4).

1. Position the battery cell (4) on the trace markings inscribed from the battery cell removal step.
2. Install the battery hold down (3) and tighten the hold down fasteners (2) to 9 (80 lb in).
3. Tighten the hose clamps (1) to 2 (18 lb in).
4. Remove the EL 50325 High Voltage Battery Terminal Cover.
5. Install the battery interface control module (1).
6. Install the auxiliary battery wiring harness (1).
7. Install the battery cable (2).
8. Install the connector housing (2) and tighten the housing fasteners (1) to 9 (80 lb in).
9. Install the current sensor (2) and tighten the current sensor fasteners (1) to 9 (80 lb in).
10. Install the battery energy control module wiring harness (1) and connect the electrical connectors.
11. Install the battery cable (2) and tighten the bus bar fasteners (1) to 9 (80 lb in).
12. Perform the hybrid battery pack coolant passage leak test. Refer to «Hybrid Battery Pack Coolant Passage Leak Test»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybrid-battery-pack-coolant-passage-leak) .
13. Perform the cell battery balancing (Section 2). Refer to «Hybrid/EV Battery Cell Balancing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
14. Install the drive motor battery cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
15. Enable the high voltage system. Refer to «High Voltage Enabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .

Cell Battery Replacement (Section 3)

Special Tools

1. EL 48264 Battery Pack Lifting Adapter
2. EL 50115 Battery Section Lifting Adapters
3. EL 50325 High Voltage Battery Terminal Covers

For equivalent regional tools, refer to Special Tools .

1. Disable the high voltage system. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
2. Remove the bus bar fasteners (1) and battery cable (2).
3. Disconnect the electrical connectors and remove the battery energy control module wiring harness (1).
4. Remove the connector housing fasteners (1) and housing (2).
5. Remove the bus bar fasteners (1) and battery cable (2).
6. Remove the battery interface control modules (1) and disconnect the auxiliary battery harness electrical connectors (2).
7. Install the EL 50325 High Voltage Battery Terminal Cover.
8. Loosen the hose clamps (1).
9. Remove the hold down fasteners (2) and battery hold down (3).
10. Trace the position of the battery cell on the battery tray using a paint pen or permanent marker.
11. Using the EL 50115 Battery Section Lifting Adapters along with the EL 48264 Battery Pack Lifting Adapter , remove the battery section (4).

1. Position the battery cell (4) on the trace markings inscribed from the battery cell removal step.
2. Install the battery hold down (3) and tighten the hold down fasteners (2) to 9 (80 lb in).
3. Tighten the hose clamps (1) to 2 (18 lb in).
4. Remove the EL 50325 High Voltage Battery Terminal Cover.
5. Install the battery interface control modules (1) and connect the auxiliary battery harness electrical connectors (2).
6. Install the battery cable (2).
7. Install the connector housing (2) and tighten the housing fasteners (1) to 9 (80 lb in).
8. Install the battery energy control module wiring harness (1) and connect the electrical connectors.
9. Install the battery cable (2) and tighten the bus bar fasteners (1) to 9 (80 lb in).
10. Perform the hybrid battery pack coolant passage leak test. Refer to «Hybrid Battery Pack Coolant Passage Leak Test»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybrid-battery-pack-coolant-passage-leak) .
11. Perform the cell battery balancing (Section 3). Refer to «Hybrid/EV Battery Cell Balancing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
12. Install the drive motor battery cover. Refer to «Drive Motor Battery Cover Replacement»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
13. Enable the high voltage system. Refer to «High Voltage Enabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .

Scheme 68

Drive Motor Battery Current Sensor Replacement

Scheme 69

Drive Motor Battery Interface Control Module Replacement (Module 1)

Scheme 70

Drive Motor Battery Interface Control Module Replacement (Module 2)

Scheme 71

Drive Motor Battery Interface Control Module Replacement (Module 3)

Scheme 72

Drive Motor Battery Interface Control Module Replacement (Module 4)

Scheme 73

Battery Cable Replacement (Terminal to Battery 1)

Scheme 74

Battery Cable Replacement (Battery 2 to Battery 3)

Scheme 75

Battery Cable Replacement (Battery 3 to Battery 4)

Scheme 76

Battery Cable Replacement (Terminal to Battery 4)

Scheme 77

Drive Motor Battery Wire Junction Block Relay Replacement

Drive Motor Battery Replacement and Shipping Preparation

Special Tools

1. EL 49976 Battery Pack Lifting Fixture
2. EL 50209 Battery Terminal Covers

For equivalent regional tools, refer to Special Tools .

1. Disable the high voltage system. Refer to «High Voltage Disabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
2. Remove the rear exhaust pipe heat shield. Refer to «Exhaust Pipe Heat Shield Replacement (Rear)»(/cadillac/elr/i-2013-2015/remont/exhaust/#engine-exhaust-system) .
3. Remove the drive motor generator radiator surge tank cap.
4. Remove the drain plug (1) only if preparing the battery for refurbishment or internal component repair.
5. Collect any fluid present in the drain pan and if no fluid is present, insert a clean white cloth or cotton swab through the drain plug opening, looking for any evidence of coolant residue.
6. Remove the drive motor generator battery coolant inlet and outlet pipes fastener (2) and remove the coolant pipes (1) from the plenum.
7. Using a drain pan to collect any coolant, remove the metal coolant pipe retainers (1) and disconnect the inlet and outlet coolant pipes (2).
8. Disconnect the following from the drive motor battery: Body Harness Connector F118 (1) Interlock Loop Connectors X6, X7 (2) Connectors X1 and X2 (3)
9. Remove the 300V positive and negative cable connector mounting bolt (2).
10. Remove the 300V positive and negative cable connector (3).
11. Remove connectors X4 and X5 (1).
12. Remove the 300-Volt cable connector fastener (1).
13. Remove the ground strap fasteners (1), from the body side.
14. Support the battery (1) using the EL 49976 lifting fixture , in conjunction with a suitable lift table. The battery mass is approximately 204 kg (450 lbs).
15. Ensure the long axis of the lifting fixture is mounted to the long side of the lift table.
16. Mount the lifting fixture to the lift table with 4 fasteners.
17. Adjust the angle of the table/lifting fixture until it is parallel to the battery tray/aero shield.
18. Raise the fixture until it is firmly resting against the tray/aero shield along the entire perimeter of the fixture.
19. Remove the battery tray fasteners (1) and (2).
20. Remove the drive motor generator battery and the EL-49976 battery lifting fixture from the lift table and set aside.
21. Remove the replacement drive motor generator battery and the replacement EL-49976 battery lifting fixture from the container and mount to the lift table.
22. If the drive motor generator battery is to be out of the vehicle for an extended period of time, place the drive motor generator battery in a safe location with the appropriate safety cones and protocols. Install EL50209 protective terminal covers on connection points.
23. Ensure that tape covers the manual disconnect terminals on the drive motor generator battery.
24. If the drive motor generator battery is being returned, prepare the drive motor generator battery for safe shipping by performing the following: NOTE: As part of the battery removal process, all coolant should be drained from the battery pack. Install coolant plugs (2) in the coolant lines. Coolant plugs can be removed from the new service battery assembly and installed in the returned battery. Additional coolant plugs (GM p/n 22770854) can be ordered if they are needed. NOTE: The MSD lever should remain with the vehicle and not be returned with the battery assembly. Install the S15 Manual Service Disconnect (MSD) Cover. The MSD cover can be removed from the new service battery assembly and installed in the returned battery. Additional MSD covers (GM p/n 22770856) can be ordered if they are needed. NOTE: The failed battery must be removed and returned with a battery assembly lifting fixture (GM Special Tool EL-49976). This lifting fixture will be attached to the failed battery and placed in the shipping container. Each new service battery will come with a battery assembly lifting fixture for use during installation. You will keep this fixture for servicing future battery removals. Install the High Voltage Connector Cover. The high voltage connector cover can be removed from the service battery and installed on the returned battery. If the service battery assembly did not come with a high voltage connector cover, additional covers can be ordered by calling 1-800 GM TOOLS. Reference tool # EL-50209 when placing your order.

1. Install the drive motor generator battery, with the EL 49976 lifting fixture to the lift table.
2. Mount the lifting table to the EL 49976 lifting fixture with 4 fasteners.
3. Raise the EL 49976 lifting fixture with the generator drive motor battery (1) and the lift table, to the vehicle.
4. Tighten the battery tray fasteners (1) to 58 (43 lb ft) and tighten the battery tray fasteners (2) to 22 (16 lb ft).
5. Install the ground strap fasteners (1) and tighten to 9 (80 lb in).
6. Install the X4 and X5 connectors (1).
7. Connect the 300V Cable (3) to the drive motor generator battery and tighten bolt (2) to 8 (71 lb in).
8. Connect the following to the drive motor generator battery: Body Harness Connector F118 (1) Interlock Loop Connectors X6, X7 (2) Connectors X1 and X2 (3)
9. Connect the inlet and outlet coolant pipes (2) and install the metal coolant pipe retainers (1).
10. Install the drive motor generator battery coolant inlet and outlet pipes (1) to the plenum and tighten the fastener (2) to 9 (80 lb in).
11. Install the rear exhaust pipe heat shields. Refer to «Exhaust Pipe Heat Shield Replacement (Rear)»(/cadillac/elr/i-2013-2015/remont/exhaust/#engine-exhaust-system) .
12. Enable the high voltage system. Refer to «High Voltage Enabling»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) .
13. Check the battery pack cooling system for leaks. Refer to «Hybrid Cooling System Leak Test»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-battery-heating-and-cooling-system__hybrid-cooling-system-leak-test) .
14. Clear the secured high voltage DTC's. Refer to «Clear Secured High Voltage DTCs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) .
15. Perform the Hybrid/EV battery pack capacity learn procedure. Refer to «Hybrid/EV Battery Pack Capacity Learn»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system__hybridev-battery-pack-capacity-learn) .

Scheme 78

Auxiliary Battery Wiring Harness Replacement (Module Harness 1)

Scheme 79

Auxiliary Battery Wiring Harness Replacement (Module Harness 2)

Scheme 80

Auxiliary Battery Wiring Harness Replacement (Module Harness 3)

Scheme 81

Auxiliary Battery Wiring Harness Replacement (Module Harness 4)

Clear Secured High Voltage DTCs

Note. DO NOT program a control module unless directed to by a service procedure or a service bulletin. If the control module is not properly configured with the correct calibration software, the control module will not control all of the vehicle features properly. Ensure the programming tool is equipped with the latest software and is securely connected to the data link connector. If there is an interruption during programming, programming failure or control module damage may occur. Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will interrupt programming. When required install the EL-49642 SPS Programming Support Tool to maintain system voltage. If not available, connect a fully charged 12 V jumper or booster pack disconnected from the AC voltage supply. DO NOT connect a battery charger. Turn OFF or disable systems that may put a load on the vehicles battery such as; interior lights, exterior lights (including daytime running lights), HVAC, radio, etc. During the programming procedure, follow the SPS prompts for the correct ignition switch position. Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M) system status indicators to NO.

Special Tools

EL-49642 SPS Programming Support Tool

For equivalent regional tools, refer to Special Tools .

The Clear Secured High Voltage DTCs procedure must be completed when the following components are replaced

1. K16 Hybrid/EV Battery Energy Control Module
2. K112A - K112D Hybrid/EV Battery Interface Control Module
3. A4 Hybrid/EV Battery Pack
4. K114B Hybrid/EV Powertrain Control Module 2
5. T6 Power Inverter Module Assembly (Assembly includes; K114A Hybrid/EV Powertrain Control Module, K107A Drive Motor 1 Control Module, K107B Drive Motor 2 Control Module, K6 Transmission Fluid Pump Control Module - Auxillary)

The Clear Secured High Voltage DTCs procedure requires scan tool interaction with two different control modules in sequence and can be completed using the following steps

1. Install EL-49642 SPS programming support tool.
2. Vehicle in Service Mode. With a scan tool, Clear All DTCs.
3. With a scan tool, select Hybrid/EV Powertrain Control Module 2 Control Functions list. Select Clear Secured High Voltage DTCs and follow the on-screen instructions.
4. With a scan tool, select Hybrid/EV Powertrain Control Module Control Functions list. Select Clear Secured High Voltage DTCs and follow the on-screen instructions.
5. With a scan tool, select Hybrid/EV Powertrain Control Module 2 Control Functions list. Select Clear Secured High Voltage DTCs and follow the on-screen instructions.
6. With a scan tool, Clear All DTCs.
7. Vehicle OFF.

Unsuccessful Programming Recovery

In the event of an interrupted or unsuccessful programming event, perform the following steps

1. Ignition ON. Ensure the control module, DLC and programming tool connections are secure and the SPS software is up to date.
2. Verify the control module can be reprogrammed. If the control module cannot be reprogrammed Ignition OFF for one minute, ignition ON. Verify the control module can be reprogrammed. If the control module cannot be reprogrammed, replace the control module. If the control module can be reprogrammed. All OK. If the control module can be reprogrammed
3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for hybrid/EV powertrain control module 2 or hybrid/EV powertrain control module replacement, programming and setup.

Hybrid/EV Battery Pack Capacity Learn

Note. DO NOT program a control module unless directed to by a service procedure or a service bulletin. If the control module is not properly configured with the correct calibration software, the control module will not control all of the vehicle features properly. Ensure the programming tool is equipped with the latest software and is securely connected to the data link connector. If there is an interruption during programming, programming failure or control module damage may occur. Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will interrupt programming. When required install the EL-49642 SPS Programming Support Tool to maintain system voltage. If not available, connect a fully charged 12 V jumper or booster pack disconnected from the AC voltage supply. DO NOT connect a battery charger. Turn OFF or disable systems that may put a load on the vehicles battery such as; interior lights, exterior lights (including daytime running lights), HVAC, radio, etc. During the programming procedure, follow the SPS prompts for the correct ignition switch position. Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M) system status indicators to NO.

Special Tools

EL-49642 SPS Programming Support Tool

For equivalent regional tools, refer to Special Tools .

The Hybrid/EV Battery Pack Capacity Learn procedure must be completed when the following components are replaced

1. Hybrid/EV Powertrain Control Module 2
2. Hybrid/EV Battery Energy Control Module
3. Hybrid/EV Battery Interface Control Module
4. Hybrid/EV Battery Pack

The Hybrid/EV Battery Pack Capacity Learn procedure can be completed with a scan tool using the following steps

1. Install EL-49642 SPS programming support tool.
2. Vehicle in Service Mode.
3. With a scan tool, select Hybrid/EV Powertrain Control Module 2 Configuration/Reset Functions. Perform the Learn Functions - Hybrid/EV Battery Pack Capacity Learn and follow the on-screen instructions.
4. With a scan tool, Clear All DTCs.

In the event of an interrupted or unsuccessful programming event, perform the following steps

1. Ignition ON. Ensure the control module, DLC and programming tool connections are secure and the SPS software is up to date.
2. Verify the control module can be reprogrammed. If the control module cannot be reprogrammed Ignition OFF for one minute, ignition ON. Verify the control module can be reprogrammed. If the control module cannot be reprogrammed, replace the control module. If the control module can be reprogrammed. All OK. If the control module can be reprogrammed
3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for hybrid/EV powertrain control module 2 replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Hybrid/EV Battery Cell Balancing

The EL-50332 Hybrid/EV Battery Service Tool is used to match the voltage level of a replacement battery section to the existing battery sections following a service event. The tool will charge or discharge the replacement section, as required, based on measured cell group voltage data. The EL-50332 requires feedback from the battery energy control module during the balancing process. Communication is through the A4 Hybrid/EV Battery Pack X1 and X2 connectors and a low voltage interface harness provided with the EL-50332 Hybrid/EV Battery Service Tool. The charging and discharging is performed by direct connection to the replacement battery section positive and negative terminals.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. EL-50332 Hybrid/EV Battery Service Tool
2. EL-50332-105 Universal Fuse Box
3. EL-50332-110 Vehicle Interface Module
4. EL-50332-115 Power Inverter Module High Voltage Interface Cable
5. EL-50332-120 High Voltage Interface Cable
6. EL-50332-125 Vehicle Interface Module Low Voltage 24-Pin Cable
7. EL-50332-135 Hybrid/EV Battery Contactor Assembly Interface Cable
8. EL-50332-140 14 V Accessory Power Module Interface Cable
9. EL-50332-145 Black Banana Jack Cable
10. EL-50332-150 Red Banana Jack Cable
11. EL-50332-155 Green Banana Jack Cable
12. EL-50332-160 12 V Auxiliary Power Cable
13. EL-50332-165 12 V Auxiliary Clamps Adapter Cable
14. EL-50332-170 High Voltage Alligator Clamps
15. EL-50332-175 120 V Power Cable
16. EL-50332-180 250 V Power Cable - AUS
17. EL-50332-175 120 V Power Cable - EU

Inspection Procedure

1. Connect the EL-50332-145 Black Banana Jack Cable , EL-50332-150 Red Banana Jack Cable , and EL-50332-155 Green Banana Jack Cable to the EL-50332-105 Universal Fuse Box.
2. Connect the EL-50332-120 High Voltage Interface Cable to the EL-50332-105 Universal Fuse Box.
3. Connect the EL-50332-120 High Voltage Interface Cable to the EL-50332 Hybrid/EV Battery Service Tool.
4. Connect the EL-50332-135 Hybrid/EV Battery Contactor Assembly Interface Cable to the EL-50332-110 Vehicle Interface Module .
5. Connect the EL-50332-125 Vehicle Interface Module Low Voltage 24-Pin Cable to the EL-50332-110 Vehicle Interface Module.
6. Connect the EL-50332-125 Vehicle Interface Module Low Voltage 24-Pin Cable to the EL-50332 Hybrid/EV Battery Service Tool.
7. Connect the appropriate regional power cord to the EL-50332 Hybrid/EV Battery Service Tool .
8. Connect the appropriate regional power cord into a known good power outlet.
9. Turn ON the EL-50332 Hybrid/EV Battery Service Tool using the power switch.
10. At the MAIN MENU, select SECTION BALANCE, press the SELECT soft key.
11. At the TYPE menu, select VOLTEC, press the NEXT soft key.
12. At the TARGET menu, select appropriate section to be balanced, press the NEXT soft key.
13. Connect the EL-50332-155 Green Banana Jack Cable to the A4 Hybrid/EV Battery Pack ground G340.
14. Connect the EL-50332-145 Black Banana Jack Cable to the appropriate section negative stud to be balanced. Refer to «Hybrid/EV Energy Storage Schematics»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) for Hybrid Battery Section 1, Hybrid Battery Section 2, or Hybrid Battery Section 3.
15. Connect the EL-50332-150 Red Banana Jack Cable to the appropriate section positive stud to be balanced. Refer to «Hybrid/EV Energy Storage Schematics»(/cadillac/elr/i-2013-2015/remont/body-electrical/#hybridev-energy-storage-system) for Hybrid Battery Section 1, Hybrid Battery Section 2, or Hybrid Battery Section 3.
16. Press the NEXT soft key.
17. Connect the EL-50332-135 Hybid/EV Battery Contactor Assembly Interface Cable to the A4 Hybrid/EV Battery Pack.
18. Press the NEXT soft key.
19. An audible tone will sound at the end of balancing or in the event of a fault condition. A fault condition was detected Refer to the EL-50332 Hybrid/EV Battery Service Tool Instruction Manual. Section balancing completed successfully
20. At the Completed menu, press the NEXT soft key. Record warranty code. Press the EXIT soft key.
21. All OK.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Hybrid/EV Battery System Verification

The EL-50332 Hybrid/EV Battery Service Tool communicates with the battery energy control module through the A4 Hybrid/EV Battery Pack X1 and X2 connectors. The tool displays battery cell group voltages for the 96 battery cell groups along with the calculated voltage difference between the highest and lowest readings. The tool also displays the temperatures read by the 9 thermistors located within the battery sections. By reviewing this data, technicians can verify circuit integrity within the A4 Hybrid/EV Battery Pack prior to attaching the Hybrid/EV Battery Cover.

Schematic Reference

Hybrid/EV Energy Storage Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Drive Motor Battery System Description

Electrical Information Reference

1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. EL-50332 Hybrid/EV Battery Service Tool
2. EL-50332-110 Vehicle Interface Module
3. EL-50332-125 Vehicle Interface Module Low Voltage 24-Pin Cable
4. EL-50332-135 Hybid/EV Battery Contactor Assembly Interface Cable
5. EL-50332-175 120 V Power Cable

For equivalent regional tools, refer to Special Tools

1. Connect the EL-50332-125 to the EL-50332-110.
2. Connect the EL-50332-125 to the EL-50332.
3. Connect the EL-50332-175 to the EL-50332.
4. Connect the EL-50332-175 into a VAC outlet
5. Power ON the EL50332 using the power switch.
6. At the MAIN MENU, select PACK INFO, press the SELECT soft key.
7. At the MANUFACTURER menu, select correct BRAND, press the NEXT soft key.
8. At the MODEL menu, select correct MODEL, press the NEXT soft key.
9. At the COMMUNICATION CONNECTION menu, select HYBRID BATTERY CONTACTOR ASSEMBLY, press the NEXT soft key.
10. Connect the EL-50332-135 to the A4 Hybrid/EV Battery Pack.
11. Connect the EL-50332-135 to the EL-50332-110, press the NEXT soft key.
12. Install the S15 Manual Service Disconnect, press the NEXT soft key.
13. At the PACK INFO menu, scroll down to the DELTA VCELL parameter. Record and verify the DELTA VCELL is less than .1 V. If the DELTA VCELL is .1 V or greater At the PACK INFO menu, press the EXIT soft key to end the Hybrid/EV Battery System Verification. Remove the S15 Manual Service Disconnect. Remove the EL-50332-135 from the A4 Hybrid/EV Battery Pack. Verify any repairs performed are complete and that all connections are secure. NOTE: Recheck the EL-50332 cable connections by beginning at step 1 of the Hybrid/EV Battery System Verification. Retest the Hybrid/EV Battery System Verification once all repairs have been rechecked. The DELTA VCELL is less than .1 V
14. Record and verify all of the battery temperature sensor readings are within 6° C (10.8° F) of each other. If any of the battery temperature sensor readings are 6° C (10.8° F) or greater of each other At the PACK INFO menu, press the EXIT soft key to end the Hybrid/EV Battery System Verification. Remove the S15 Manual Service Disconnect. Remove the EL-50332-135 from the A4 Hybrid/EV Battery Pack. Verify any repairs performed are complete and that all connections are secure. NOTE: Recheck the EL-50332 cable connections by beginning at step 1 of the Hybrid/EV Battery System Verification. Retest the Hybrid/EV Battery System Verification once all repairs have been rechecked. The battery temperature sensor readings are within 6° C (10.8° F) of each other
15. All OK.

Scheme 82

The hybrid battery contains 288 cells. Groups of three cells are welded together in parallel called cell groups. There are a total of 96 cell groups in the hybrid battery assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 355 V direct current. The battery cell groups are joined to form 3 distinct sections. The first 30 battery cell groups make up battery section 1. This section is adjacent to the cowl and contains battery cell groups 67 through 96. The next 24 battery cell groups make up battery section 2. This section is located behind section 1 and contains battery cell groups 43 through 66. The transverse battery section is section number 3 and it contains the remaining battery cell groups 1 through 42.

The battery energy control module monitors the voltage of the 96 battery cell groups through 4 hybrid battery interface control modules. There is one hybrid battery interface control module for section 1 and 2, with section 3 having two modules. The voltage sense lines are attached to each individual cell group, and these sense lines terminate at a connector located on the top surface of the battery section. A voltage sense harness joins this connector to the hybrid battery interface control modules, located on the top surface of the battery section. The hybrid battery interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery energy control module harness.

The battery energy control module will determine when a fault condition is present. Diagnostics and system status are communicated from the battery energy control module to the hybrid powertrain control module 2 through serial data. The hybrid powertrain control module 2 is the host controller for diagnostic trouble code information.

Location

The hybrid battery is located beneath the vehicle. The battery energy control module, hybrid battery interface control modules 1-4, current sensor, and high voltage contactors are located within the hybrid battery assembly. The hybrid powertrain control module 2 is located under the front passenger seat.

Special Tools

Illustration Tool Number/ Description GE 41413-A J 41413-A Evaporative Emissions System Tester EL-48264 Battery Pack Lifting Adapter EL-48571 High Voltage Battery Pin Out Box EL-48900 HEV Safety Kit EL-49976 Hybrid/EV Battery Lifting Fixture EL-50115 Battery Section Lifting Adapter EL-50209 High Voltage Terminal Cover EL-50211 Low Voltage Jumper Harness EL 50325 High Voltage Battery Terminal Covers EL 50332 Hybrid/EV Battery Service Tool EL 50332-105 Universal Fuse Box EL 50332-110 Vehicle Interface Module EL 50332-115 Power Inverter Module High Voltage Interface Cable EL 50332-120 High Voltage Interface Cable EL 50332-125 Vehicle Interface Module Low Voltage 24-Pin Cable EL 50332-135 Hybid/EV Battery Contactor Assembly Interface Cable EL 50332-140 14 V Accessory Power Module Interface Cable EL 50332-145 Black Banana Jack Cable EL 50332-150 Red Banana Jack Cable EL 50332-155 Green Banana Jack Cable EL 50332-160 12 V Auxillary Power Cable EL 50332-165 12 V Auxillary Clamps Adapter Cable EL 50332-170 High Voltage Alligator Clamps EL 50332-175 120 V Power Cable EL 50332-180 250 V Power Cable - AUS EL 50332-185 250 V Power Cable - EU EL-50554-1 14 V Power Inverter Assurance Harness EL-50554-2 Charger Assurance Harness EL-50772 Insulation Multimeter EL-50812 Battery Smoke Test Leak Adapters

Scheme 83

Scheme 84

Scheme 85

Scheme 86

Scheme 87

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• COMPONENT CONNECTOR END VIEWS - INDEX
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Battery Negative Cable Disconnection and Connection
• Drive Motor Generator Power Inverter Module Cover Replacement
• Catalytic Converter Replacement
• Heated Oxygen Sensor Replacement - Sensor 2
• Battery Energy Control Module Programming and Setup
• Window Motor Programming - Express Function
• Diagnostic Trouble Code (DTC) List - Vehicle
• Diagnostic Repair Verification
• Battery Heater Replacement
• HYBRID COOLING SYSTEM LOSS OF COOLANT (BATTERY)
• Drive Motor Battery Charger Replacement
• Air Conditioning and Drive Motor Battery Cooling Compressor Replacement
• Generator Rotor and Stator Removal - Unit A
• Fastener Caution
• Repairs and Inspections Required After a Collision
• Front Floor Console Rear Trim Panel Replacement
• Lifting and Jacking the Vehicle
• Drive Motor Battery Cooling System Draining and Filling
• Drivetrain and Front Suspension Frame Replacement
• Drive Motor Battery Coolant Cooler Inlet Hose Assembly Replacement
• Special Tools
• Hybrid Battery Pack Coolant Passage Leak Test
• Hybrid Cooling System Leak Test
• Special Tools
• Hybrid/EV Energy Storage Schematics
• Special Tools
• Drive Motor Battery High Voltage Manual Disconnect Lever Replacement
• Drive Motor Battery Replacement and Shipping Preparation
• Hybrid/EV Battery Pack Capacity Learn
• Clear Secured High Voltage DTCs
• EL-48571 High Voltage Battery Pin Out Box Reference
• Cell Battery Replacement (Section 3)
• Cell Battery Replacement (Section 1)
• Cell Battery Replacement (Section 2)
• Rechargeable Energy Storage System Smoke Test