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Hybrid Energy Storage System Cadillac Escalade GMT900

Charging System 31 illustrations ~20104 words

Temperature Versus Resistance

Temperature Degrees C (Degrees F)Resistance k ohm (typical)
40°C (-40°F)209
20°C (-4°F)71.7
0°C (32°F)27.9
20°C (68°F)12.1
40°C (104°F)5.81
60°C (140°F)3.01
80°C (176°F)1.67
100°C (212°F)N/A

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
300V Positive and Negative Cable Nut10 N.m89 lb in
Battery Cover Side Nut8 N.m71 lb in
Battery Cover Upper Nut8 N.m71 lb in
Battery Negative Cable Ground Nut5 N.m44 lb in
Battery Positive and Negative 300V Cable Bolt6 N.m53 lb in
Drive Motor Battery 300V Cable Floor Grommet Nut9 N.m80 lb in
Drive Motor Battery Cable Assembly Nut5 N.m44 lb in
Drive Motor Battery Cable Nut5 N.m44 lb in
Drive Motor Battery Cable Terminal Extension Bolt6 N.m53 lb in
Drive Motor Battery Cable Terminal Nut5 N.m44 lb in
Drive Motor Battery Control Module Bracket Bolt5 N.m44 lb in
Drive Motor Battery Cover Case Upper Bolt8 N.m71 lb in
Drive Motor Battery Cover Front Bolt8 N.m71 lb in
Drive Motor Battery Cover Rear Bolt6 N.m53 lb in
Drive Motor Battery Cover Side Bolt6 N.m53 lb in
Drive Motor Battery Cover Terminal Bolt6 N.m53 lb in
Drive Motor Battery Current Limit Resistor Nut3 N.m27 lb in
Drive Motor Battery Current Sensor Bolt2 N.m18 lb in
Drive Motor Battery Disconnect Switch Nut5 N.m44 lb in
Drive Motor Battery Ground Shield Cable Terminal Fastener Nut9 N.m80 lb in
Drive Motor Battery Housing Relay Nut3 N.m27 lb in
Drive Motor Battery Negative Cable Terminal Fastener Nut9 N.m80 lb in
Drive Motor Battery Negative Relay Bracket Bolt6 N.m53 lb in
Drive Motor Battery Positive Cable Terminal Fastener Nut9 N.m80 lb in
Drive Motor Battery Positive High Voltage Contactor Relay Nut3 N.m27 lb in
Drive Motor Battery Positive Relay Nut3 N.m27 lb in
Drive Motor Battery Sensor Bracket Bolt5 N.m44 lb in
Drive Motor Battery Terminal Block Cover Nut6 N.m53 lb in
Drive Motor Battery Terminal Block Nut6 N.m53 lb in
Drive Motor Generator Battery Bracket Negative Relay Nut6 N.m53 lb in
Drive Motor Generator Battery Cooling Blower Nut6 N.m53 lb in
Drive Motor Generator Battery Cooling Blower Bolt6 N.m53 lb in
Drive Motor Generator Battery Ground Bolt25 N.m18 lb ft
Drive Motor Generator Battery Ground Nut25 N.m18 lb ft
Drive Motor Generator Battery Insulator Positive Relay Nut6 N.m53 lb in
Drive Motor Generator Battery Mounting Nut25 N.m18 lb ft
Drive Motor Generator Battery Retainer Nut50 N.m37 lb ft
High Voltage (HV) dc Battery Cable Mounting Fasteners9 N.m80 lb in
High Voltage (HV) dc Battery Cable Terminal Fasteners9 N.m80 lb in
High Voltage (HV) dc Electric Air Conditioning Compressor (ACCM) Cable Mounting Fasteners9 N.m80 lb in
High Voltage (HV) dc Electric Air Conditioning Compressor (ACCM) Cable Terminal Fasteners9 N.m80 lb in

Drive Motor Generator Battery End of Life Resistance

Bat. Int. Temp °C (°F)Module Pair Resistance mOhmPack Resistance Ohms
10°C (14°F)141.338.93
5°C (23°F)112.057.08
0°C (32°F)88.905.62
5°C (41°F)68.674.34
10°C (50°F)52.923.34
15°C (59°F)40.102.53
25°C (77°F)27.001.71
35°C (95°F)23.551.49
45°C (113°F)21.221.34
50°C (122°F)20.001.26

Scheme 13

Scheme 13: Hybrid Energy Storage Schematics
Scheme 13: Hybrid Energy Storage Schematics

Scheme 14

Scheme 14
Scheme 14

Scheme 15

Scheme 15
Scheme 15

DIAGNOSTIC CODE INDEX

DTCDescription
DTC P0A1F, P1A01, P1A05, or P1A06P0A1F: Battery Energy Control Module Internal Performance P1A01: Battery Energy Control Module Long Term Memory Performance P1A05: Battery Energy Control Module Random Access Memory (RAM) P1A06: Battery Energy Control Module Read Only Memory (ROM)
DTC P0A80P0A80: Replace Hybrid Battery Pack
DTC P0A95P0A95: High Voltage Fuse
DTC P0ABB, P0ABC, or P0ABDP0ABB: Hybrid Battery Voltage Sensor Performance P0ABC: Hybrid Battery Voltage Sensor Circuit Low Voltage P0ABD: Hybrid Battery Voltage Sensor Circuit High Voltage
DTC P0AC0, P0AC1, P0AC2, or P1A07P0AC0: Hybrid Battery Current Sensor Performance P0AC1: Hybrid Battery Current Sensor Circuit Low Voltage P0AC2: Hybrid Battery Current Sensor Circuit High Voltage P1A07: Battery Energy Control Module 5-Volt Reference Circuit
DTC P0ADB or P0ADCP0ADB: Hybrid Battery Positive Contactor Control Circuit Low Voltage P0ADC: Hybrid Battery Positive Contactor Control Circuit High Voltage
DTC P0ADF or P0AE0P0ADF: Hybrid Battery Negative Contactor Control Circuit Low Voltage P0AE0: Hybrid Battery Negative Contactor Control Circuit High Voltage
DTC P0AE7P0AE7: Hybrid Battery Precharge Contactor Control Circuit High Voltage
DTC P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C, P0B91, P0B96, or P0B9BP0B3C: Hybrid Battery 1 Circuit Performance P0B41: Hybrid Battery 2 Circuit Performance P0B46: Hybrid Battery 3 Circuit Performance P0B4B: Hybrid Battery 4 Circuit Performance P0B50: Hybrid Battery 5 Circuit Performance P0B55: Hybrid Battery 6 Circuit Performance P0B5A: Hybrid Battery 7 Circuit Performance P0B5F: Hybrid Battery 8 Circuit Performance P0B64: Hybrid Battery 9 Circuit Performance P0B69: Hybrid Battery 10 Circuit Performance P0B6E: Hybrid Battery 11 Circuit Performance P0B73: Hybrid Battery 12 Circuit Performance P0B78: Hybrid Battery 13 Circuit Performance P0B7D: Hybrid Battery 14 Circuit Performance P0B82: Hybrid Battery 15 Circuit Performance P0B87: Hybrid Battery 16 Circuit Performance P0B8C: Hybrid Battery 17 Circuit Performance P0B91: Hybrid Battery 18 Circuit Performance P0B96: Hybrid Battery 19 Circuit Performance P0B9B: Hybrid Battery 20 Circuit Performance
DTC P0B3D, P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88, P0B8D, P0B92, P0B97, or P0B9CP0B3D: Hybrid Battery 1 Circuit Low Voltage P0B42: Hybrid Battery 2 Circuit Low Voltage P0B47: Hybrid Battery 3 Circuit Low Voltage P0B4C: Hybrid Battery 4 Circuit Low Voltage P0B51: Hybrid Battery 5 Circuit Low Voltage P0B56: Hybrid Battery 6 Circuit Low Voltage P0B5B: Hybrid Battery 7 Circuit Low Voltage P0B60: Hybrid Battery 8 Circuit Low Voltage P0B65: Hybrid Battery 9 Circuit Low Voltage P0B6A: Hybrid Battery 10 Circuit Low Voltage P0B6F: Hybrid Battery 11 Circuit Low Voltage P0B74: Hybrid Battery 12 Circuit Low Voltage P0B79: Hybrid Battery 13 Circuit Low Voltage P0B7E: Hybrid Battery 14 Circuit Low Voltage P0B83: Hybrid Battery 15 Circuit Low Voltage P0B88: Hybrid Battery 16 Circuit Low Voltage P0B8D: Hybrid Battery 17 Circuit Low Voltage P0B92: Hybrid Battery 18 Circuit Low Voltage P0B97: Hybrid Battery 19 Circuit Low Voltage P0B9C: Hybrid Battery 20 Circuit Low Voltage
DTC P0B3E, P0B43, P0B48, P0B4D, P0B52, P0B57, P0B5C, P0B61, P0B66, P0B6B, P0B70, P0B75, P0B7A, P0B7F, P0B84, P0B89, P0B8E, P0B93, P0B98, or P0B9DP0B3E: Hybrid Battery 1 Circuit High Voltage P0B43: Hybrid Battery 2 Circuit High Voltage P0B48: Hybrid Battery 3 Circuit High Voltage P0B4D: Hybrid Battery 4 Circuit High Voltage P0B52: Hybrid Battery 5 Circuit High Voltage P0B57: Hybrid Battery 6 Circuit High Voltage P0B5C: Hybrid Battery 7 Circuit High Voltage P0B61: Hybrid Battery 8 Circuit High Voltage P0B66: Hybrid Battery 9 Circuit High Voltage P0B6B: Hybrid Battery 10 Circuit High Voltage P0B70: Hybrid Battery 11 Circuit High Voltage P0B75: Hybrid Battery 12 Circuit High Voltage P0B7A: Hybrid Battery 13 Circuit High Voltage P0B7F: Hybrid Battery 14 Circuit High Voltage P0B84: Hybrid Battery 15 Circuit High Voltage P0B89: Hybrid Battery 16 Circuit High Voltage P0B8E: Hybrid Battery 17 Circuit High Voltage P0B93: Hybrid Battery 18 Circuit High Voltage P0B98: Hybrid Battery 19 Circuit High Voltage P0B9D: Hybrid Battery 20 Circuit High Voltage
DTC P0BBDP0BBD: Hybrid Battery Pack Voltage Variation High
DTC P0C76P0C76: Hybrid Battery System High Voltage Present
DTC P0C77 or P1A20P0C77: Hybrid Battery System Precharge Time Too Short P1A20: Hybrid Battery System Precharge Time Too Long
DTC P1A0C or P1A0DP1A0C: Battery Energy Control Module System Voltage Low P1A0D: Battery Energy Control Module System Voltage High
DTC P1A1F or P1A4EP1A1F: Battery Energy Control Module Hybrid Battery System Voltage Low P1A4E: Battery Energy Control Module Hybrid Battery System Voltage High
DTC P1A21P1A21: Hybrid Battery Contactor Control Sequence Incorrect
DTC P1AE5P1AE5: Battery Energy Control Module Hybrid Battery Power Off Control Circuit
DTC P1AE6 or P1AE7P1AE6: Battery Energy Control Module Hybrid Battery Voltage Isolation Sensor Circuit P1AE7: Battery Energy Control Module Hybrid Battery Voltage System Isolation Lost

DIAGNOSTIC CODE INDEX

High Voltage Safety

WARNINGAlways perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGEnsure all High Voltage safety procedures are followed. Failure to follow the procedure exactly as written may result in serious injury or death.
WARNINGBefore working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors Visually and functionally inspect the gloves before use. Wear the Insulation gloves at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedure exactly as written may result in serious injury or death.
WARNINGThis vehicle is equipped with a high voltage battery that is completely isolated from the chassis ground. Never utilize AC powered test equipment to probe the high voltage system. Serious injury, death and component damage could occur if the high voltage system is grounded through the electric utility. Failure to follow the procedure exactly as written may result in serious injury or death.

Special Tools

  1. EL-48569 Terminal Covers. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  2. EL-48900 HEV Safety Kit

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. Attach the ignition key to the high voltage manual disconnect lever and put the lever and the ignition key in a secure place.
  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-48569 terminal covers and UL® Listed or equivalent insulation tape rated at a minimum of 600 volts. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  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 lever, 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.

Scheme 16

Scheme 16: Labels for Components, Wire Harness, and Connectors
Scheme 16: 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 (1) and orange warning (2) labels. The intermediate 42 volt system is encased in a blue colored covering, and has yellow caution (3) labels on the components, wire harnesses, and cables.

Scheme 17

Scheme 17: High Voltage insulation Glove Inspection Procedure
Scheme 17: High Voltage insulation Glove Inspection Procedure

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 volts.

  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 certified up-to-date If any of the above conditions are met, do not use the gloves.

High Voltage Disabling

WARNINGEnsure all High Voltage safety procedures are followed. Failure to follow the procedure exactly as written may result in serious injury or death.
WARNINGBefore working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors Visually and functionally inspect the gloves before use. Wear the Insulation gloves at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedure exactly as written may result in serious injury or death.

Note. Use the correct procedure, depending on components being serviced, to disable the High Voltage system.

Refer to one of the following procedures below depending on components being serviced

  1. When Servicing Drive Motor Generator Battery Assembly or 300V DC Cable
  2. When Servicing Drive Motor Generator Control Module Assembly or Cable Connections

When Servicing Drive Motor Generator Battery Assembly or 300V DC Cables

  1. Review the high voltage safety information prior to performing the High Voltage Disabling procedure. Refer to «High Voltage Safety»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-safety) .
  2. Disable the voltage sources to the 2 mode hybrid vehicle. Remove the ignition key. Remove the rear seat frame front finish cover. Refer to «Rear Seat Frame Front Finish Cover Replacement (with HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/seats/#seat-hardware-seat-trim-and-upholstery) . Remove the high voltage manual disconnect lever. Attach the ignition key to the lever and put the lever and the ignition key in a secure place. Wait at least 5 minutes before continuing. The 5 minute wait allows certain control modules to run diagnostics and store critical data as well as allowing the high voltage capacitors to discharge.
  3. Disconnect the 12 volt battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .
  4. Remove the rear seat riser finish cover. Refer to «Rear Seat Riser Finish Cover Replacement (with HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
  5. Remove the terminal extension cover assembly.
  6. To verify that the voltage has been disabled at the drive motor generator battery assembly terminals, perform the following: Set the digital multimeter (DMM) to DC mode. Verify the DMM is operating properly by measuring the voltage of the 12 volt battery. Using the DMM, verify the voltage measures less than 3 volts at the following points: NOTE: The vehicle 12 volt battery should have been disconnected in the prior step. Inaccurate test results occur if the 12 battery is connected. Across the HVDC (+) positive (3) and HVDC (-) negative (4) terminals If the test result was more than 3 volts, the drive motor generator control module internal capacitors are still charged. Keep the insulation gloves on and install the cable cover. Wait 5 minutes and then remove the cover and return to the beginning of this step. HVDC (+) positive (3) to vehicle chassis ground HVDC (-) negative (4) to vehicle chassis ground If the test result was more than 3 volts, there is a stuck closed contactor and a loss of isolation within the drive motor generator battery assembly. Refer to «High Voltage Contactor/Relay Malfunction»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) .
  7. Using a DMM test for voltage from the High Voltage manual disconnect terminal (1) to the High Voltage DC positive and negative terminal connections (3, 4). The result should be less than 3 volts. If the test result was more than 3 volts, a high voltage positive contactor relay or the precharge relay is stuck closed. Refer to «High Voltage Contactor/Relay Malfunction»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) .
  8. Using a DMM test for voltage from the High Voltage manual disconnect terminal (2) to the high voltage DC positive and negative terminal connections (3, 4). The result should be less than 3 volts. If the test result was more than 3 volts, the high voltage negative contactor relay is stuck closed. Refer to «High Voltage Contactor/Relay Malfunction»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) .
  9. Retest the DMM by measuring the 12 volt battery. If the DMM does not properly measure the 12 volt battery, repair or replace the DMM and repeat all voltage measurements. If all the test results were less than 3 volts, the 300V DC cables can now be removed from the drive motor generator battery assembly.

When Servicing Drive Motor Generator Control Module Assembly or Cable Connections

  1. Disable the voltage sources to the 2 mode hybrid vehicle. Remove the ignition key. Remove the rear seat frame front finish cover. Refer to «Rear Seat Frame Front Finish Cover Replacement (with HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/seats/#seat-hardware-seat-trim-and-upholstery) . Remove the high voltage manual disconnect lever. Attach the ignition key to the lever and put the lever and the ignition key in a secure place. Wait at least 5 minutes before continuing. The 5 minute wait allows certain control modules to run diagnostics and store critical data as well as allowing the high voltage capacitors to discharge.
  2. Disconnect the 12 volt battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .
  3. Remove the drive motor generator control module sight shield. Refer to «Drive Motor Generator Control Module Sight Shield Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-repair-instructions) .
  4. Remove the 3 phase cable cover.
  5. To verify that no voltage is present at the high voltage connection for the drive motor generator control module, perform the following: Set the digital multimeter (DMM) to DC mode. Verify the DMM is operating properly by measuring the voltage of the 12 volt battery. NOTE: The vehicle 12 volt battery should have been disconnected in the prior step. Inaccurate test results occur if the 12 battery is connected. Using the DMM, verify the voltage measures less than 3 volts at the following points: Across the HVDC (+) positive (1) and HVDC (-) negative (2) terminals If the test result was more than 3 volts, the drive motor generator control module internal capacitors are still charged. Keep the insulation gloves on and install the 3 phase cable cover. Wait 5 minutes and then remove the 3 phase cable cover and return to the beginning of this step. HVDC (+) positive (1) to vehicle chassis ground HVDC (-) negative (2) to vehicle chassis ground If the test result was more than 3 volts, there is a stuck closed contactor and a loss of isolation within the drive motor generator battery assembly. Refer to «High Voltage Contactor/Relay Malfunction»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) .
  6. Retest the DMM by measuring the 12 volt battery. If the DMM does not properly measure the 12 volt battery, repair or replace the DMM and repeat all voltage measurements. If all the test results were less than 3 volts, the cables can now be removed from the drive motor generator control module assembly.

High Voltage Enabling

WARNINGEnsure all High Voltage safety procedures are followed. Failure to follow the procedure exactly as written may result in serious injury or death.
WARNINGBefore working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors Visually and functionally inspect the gloves before use. Wear the Insulation gloves at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedure exactly as written may result in serious injury or death.

Review the high voltage safety information prior to performing the High Voltage Enabling procedure. Refer to High Voltage Safety .

  1. Ensure that the 12 V battery is disconnected.
  2. After finishing work on the high voltage systems and before reinstalling the high voltage manual disconnect lever, inspect for the following: Verify that all tools or loose components have been removed. Verify high voltage system integrity and that all connectors are installed. Verify that all high voltage interlock circuit (HVIC) connectors and covers are installed.
  3. Install the high voltage manual disconnect lever.
  4. Install the rear seat riser finish cover. Refer to «Rear Seat Riser Finish Cover Replacement (with HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/seats/#seat-hardware-seat-trim-and-upholstery) .
  5. Connect the 12 V battery. Refer to «Battery Negative Cable Disconnection and Connection»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .
  6. Start the engine, then turn the ignition OFF.
  7. Ignition ON, clear all DTC Information with a scan tool.
  8. Ignition OFF wait 2 minutes.
  9. Ignition ON, verify with a scan tool no DTCs are set. If DTCs are set go to appropriate DTC information.
  10. Verify that High Voltage has enabled by observing the HPCM 300 V Circuit voltage scan tool parameter. If High Voltage is not enabled and no DTCs are set, return to Step 6.
  11. Start and idle the engine for 2 minutes.
  12. Ignition OFF wait 5 minutes.
  13. Ignition ON, verify with the scan tool HPCM DTC Information that the following DTCs have Ran Since Code Clear and have not set: Contactor relay DTCs P0ADC, P0AE7 and P0AE0 Discharge and Pre-charge DTCs P0C76, P0C77, and P1A20 Motor position sensor learn DTCs P0C17 and P0C18 High voltage loss of isolation DTCs P1AE7, P1AF0 and P1AF2.
  1. If the DTCs have Ran and Passed, test drive the vehicle and verify no DTCs are set.
  2. If the DTCs are set, go to the appropriate DTC information.
  3. 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.

Hybrid Battery Parameter Identification

Hybrid Battery Voltage parameterMeasures sum of battery pair
Battery 1 is located next to cooling fan assembly. Battery 40 is located next to drive motor generator battery control module. Batteries are wired in series starting at battery 1 negative pole.
11 1 and 2
23 and 4
35 and 6
47 and 8
59 and 10
611 and 12
713 and 14 2
815 and 16
917 and 18
1019 and 20
1121 and 22
1223 and 24
1325 and 26
1427 3 and 28
1529 and 30
1631 and 32
1733 and 34
1835 and 36
1937 and 38
2039 and 40*
1 Location of battery temperature sensor 1 2 Location of battery temperature sensor 2 3 Location of battery temperature sensor 3 *Location of battery temperature sensor 4

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/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 drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the drive motor generator control module through serial data. The drive motor generator control module is the host controller for diagnostic trouble code (DTC) information.

This diagnostic applies to internal microprocessor integrity conditions within the drive motor generator battery control module. This is an internal electronic fault detection diagnostic of the drive motor generator battery control module. This fault is internal to the drive motor generator battery control module and no external circuits are involved.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The drive motor generator battery control module has detected an internal malfunction.

Action Taken When the DTC Sets

  1. DTCs P0A1F, P1A01, P1A05, and P1A06 are type A DTCs.
  2. The contactors will open.
  3. The malfunction indicator lamp (MIL) turns ON.

Conditions for Clearing the DTC

DTCs P0A1F, P1A01, P1A05, and P1A06 are type A DTCs.

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

Circuit/System Verification

Verify that DTC P0A1F, P1A01, P1A05, or P1A06 is not set.

  1. If any of the DTCs are set, replace the drive motor generator battery control module.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for drive motor generator battery control module replacement, setup and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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

The drive motor generator battery control module measures the internal hybrid battery resistance across the high voltage battery string and in pairs. If the internal resistance values are out of range at a given battery temperature, this DTC will set. Higher internal resistance will also increase battery temperature.

  1. The ignition is ON.
  2. The 12 V battery voltage is 9-18 V.
  3. Hybrid battery current is -70 to +100 A.
  4. Hybrid battery temperature is -10 to +50°C (14-22°F).

One of the following conditions exists for 10 minutes

  1. Hybrid battery pack calculated hybrid battery resistance is greater than the value specified in «Drive Motor Generator Battery End of Life Resistance»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__drive-motor-generator-battery-end-of) .
  2. Hybrid battery resistance is greater than the value specified in «Drive Motor Generator Battery End of Life Resistance»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__drive-motor-generator-battery-end-of) .
  1. DTC P0A80 is a type A DTC.
  2. Hybrid battery power is reduced to 0 Kw.
  3. The battery cooling fan turns ON high speed.
  4. The driver information center (DIC) displays the SERVICE HYBRID SYSTEM message.

DTC P0A80 is a type A DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

Ignition ON, observe the scan tool BECM Hybrid Batt. Pack Resistance parameter. The reading should be less than the resistance values specified in Drive Motor Generator Battery End of Life Resistance .

  1. If greater than the specified range, replace the drive motor battery assembly.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ignition (300 V)P0A95*, P0ABC*, P1A20*
* DTC P0A95 and P0ABC will only set if the fuse opens while the ignition is OFF. If the fuse is already open when the ignition is turned from OFF to ON, the precharge test will fail, and DTC P1A20 will set.

The system contains twenty battery modules. Each module contains two 7.2 V cells for a total nominal system voltage of 288 V. Each battery module is rated at 14.4 V direct current (DC) and all the modules are connected together in series. The drive motor generator battery is also referred to as the hybrid battery.

The high voltage direct current (DC) voltage system is protected by a 125 A fuse. The fuse is located in the high voltage manual disconnect lever and can only be serviced by replacing the high voltage manual disconnect lever. The fuse is located between the negative and positive terminals at hybrid battery 11.

  1. DTC P0A1F is not set.
  2. The ignition is ON.
  3. The high voltage interlock is normal.
  4. The high voltage contactors are closed.
  5. The 12 V battery voltage is 9-18 V.

All of the following conditions exist for 1 second

  1. Hybrid Battery 10 voltage is greater than 2 V.
  2. Hybrid Battery 11 voltage is less than 2 V.
  3. Hybrid Battery 12 voltage is greater than 2 V.

DTC P0A95 is a type C DTC.

  1. DTC P0A95 is a type C DTC.
  2. DTC P0A95 will clear when the contactors are closed, and all of the following conditions exist for 1 second: Hybrid Battery 10 voltage is less than 2 V. Hybrid Battery 11 voltage is greater than 2 V. Hybrid Battery 12 voltage is less than 2 V.

Diagnostic Aids

  1. Avoid cycling the ignition unnecessarily while the fuse is open. Turning the ignition ON twice with an open fuse results in a 20-40 minute precharge wait time, during which time precharging will be inhibited. It will be necessary to wait until the scan tool Precharge Wait Time parameter counts down to 0 Seconds before continuing with diagnosis.
  2. When the high voltage fuse is open the vehicle will not start.
  3. Test for high voltage interLock circuit operation by lifting up on the high voltage manual disconnect lever to disengage the high voltage interLock circuit. Monitor the high voltage interLock source and return current on the scan tool. High voltage interLock return current should read 0 mA a when the high voltage manual disconnect lever is lifted.
  4. If DTC P0A95 or P0ABC sets when the manual disconnect lever is removed, the high voltage interLock circuit may have a wire to wire short on the high voltage interLock source and return circuits between the X350 and the high voltage manual disconnect lever connector.
  5. If the high voltage fuse opens as soon as the high voltage manual disconnect is installed with the ignition OFF and the high voltage contactors are not stuck closed, the problem is internal to the drive motor generator battery assembly.
  6. If the fuse is open or the high voltage manual disconnect lever is removed, the scan tool parameter will display 0 V for hybrid battery 11.

Schematic Reference

  1. «Hybrid Energy Storage Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  2. «Hybrid Controls Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#hybrid-engine-controls-wiring-schematics)

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. EL-48458 HV Precharge Tester
  2. EL-48569 Terminal Covers. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  3. EL-48900 HEV Safety Kit
  1. Verify that DTC P1A20 or P1AE7 is not set, and that no drive motor generator control module DTCs are set. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Ignition ON, observe the scan tool Hybrid Battery 11 parameter. The reading should be between 10-19 V.

Circuit/System Testing

  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  2. Connect the 12 V battery.
  3. Ignition ON, verify the scan tool, drive motor generator battery High Voltage Interlock Status parameter displays failed. If not the specified value and the manual disconnect is removed, refer to «DTC P1AE2-P1AE4, P1B05, or P1B06»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-dtc-p181c-to-dtc-p2792) .
  4. Connect the EL-48458 at the drive motor generator battery assembly. Refer to the EL-48458 installation procedure located in «High Voltage System Diagnosis (EL-48458)»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-symptom-troubleshooting-diagnosis) .
  5. Install the manual disconnect lever.
  6. Ignition ON, precharge the high voltage system by moving the high voltage contactor relay switch on the tester to the closed position. Verify that the Hi-voltage greater than 60 V LED illuminates and stays illuminated. Wait 3 minutes. Verify the high voltage 125 A fuse does not open and that the precharge does not fail. If the fuse opened or the precharge failed, test the internal battery assembly high voltage cables for a short to ground or an open/high resistance. If the circuits test normal, replace the drive motor generator battery assembly.
  7. Ignition OFF, disconnect the X2 and X3 drive motor generator power inverter module cables.
  8. Test for infinite resistance between the terminals listed below and ground; B+ (300 V) X2 Ground (300 V) X3 If less than the specified value replace the high voltage cables.
  9. Test for infinite resistance between the B+ (300 V) terminal X1 and the ground (300 V) terminal X2 cables. If less than the specified range replace the high voltage cables.
  10. Disconnect the air conditioning control module terminal B+ (300 V) X4 and the ground (300 V) terminal X5.
  11. Test for infinite resistance between the terminals listed below and ground: B+ (300 V) X4 Ground (300 V) X5 If less than the specified range, replace the air conditioning control module.
  12. Test for greater than 50k ohms between the B+ (300 V) terminal X4 and the ground (300 V) terminal X5. If less than the specified range, test the circuits for a short between them. If the circuits test normal, replace the air conditioning control module assembly.
  13. If all circuits test normal, replace the drive motor generator power inverter module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Drive Motor Battery Negative Relay Cable Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  2. «Drive Motor Battery Positive Relay Cable Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  3. «Drive Motor Battery 300-Volt Positive and Negative Cable Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  4. «Drive Motor Generator Battery Replacement and Shipping Preparation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  5. «Air Conditioning Compressor Replacement (HP2)»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  6. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for drive motor generator battery control module, drive motor generator power inverter module, or air conditioning control module replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Disconnect Lever High Voltage FuseP0A95*, P0ABC*, P1A20*
High Voltage Monitor PositiveP1AE7P0ABB
High Voltage Monitor NegativeP1AE7P0ABB
* DTC P0A95 and P0ABC will only set if the fuse opens while the ignition is OFF. If the fuse is already open when the ignition is turned from OFF to ON, the precharge test will fail, and DTC P1A20 will set.

The system contains twenty battery modules. Each module contains two 7.2 V cells for a total nominal system voltage of 288 V. Each battery module is rated at 14.4 V direct current (DC) and all the modules are connected together in series. The drive motor generator battery is also referred to as the hybrid battery.

The drive motor generator battery control module has several methods of monitoring the total voltage values of the hybrid batteries. The drive motor generator battery control module monitors the calculated battery voltage and the terminal voltage. The calculated voltage represents the sum of the voltages from the 20 individual battery measurements, and the terminal voltage represents the total DC bus voltage as measured on the output side of the high voltage contactor. The drive motor generator battery control module compares these two voltage readings and looks for a difference. The drive motor generator battery control module also monitors the terminal voltage for both over voltage and under voltage conditions.

  1. The ignition is ON.
  2. The 12 V battery voltage is 9-18 V.
  3. The high voltage contactors are closed.

P0ABB

The drive motor generator battery control module detects a 50 V difference between the hybrid battery pack calculated voltage and the hybrid battery terminal voltage for 7 seconds.

P0ABC

The drive motor generator battery control module detects the terminal voltage is less than 50 V for 3 seconds.

P0ABD

The drive motor generator battery control module detects the terminal voltage is greater than 430 V for 3 seconds.

  1. DTCs P0ABB, P0ABC, and P0ABD are type A DTCs.
  2. The battery vent fan is commanded to high speed.

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

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. EL-48571 High Voltage Battery Pin Out Box. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  2. EL-48900 HEV Safety Kit
  1. Verify that DTCs P0A95, P0C77, and P1A20 is not set. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Verify that DTC P0ABD is not set. If the DTC is set, replace the drive motor generator battery assembly. If the DTC resets, replace the drive motor generator battery control module.
  3. Ignition ON, engine OFF, observe the scan tool Hybrid Battery Pack Calculated and Hybrid Battery Terminal parameters. The readings should be between 169 and 408 V and should be within 50 V of each other.
WARNINGAlways perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  2. Connect the 12 V battery.
  3. Ignition ON, engine OFF, command the high voltage negative contactor closed with a scan tool. Test for less than 0.5 ohms between the high voltage negative contactor terminals X2 and X3. If greater than the specified range, replace the negative contactor relay.
  4. Command the high voltage positive contactor closed with a scan tool. Test for less than 0.5 ohms between the high voltage positive contactor terminals X2 and X3. If greater than the specified range, replace the positive contactor relay.
  5. Ignition OFF, test for less than 5 ohms between the high voltage negative contactor terminal X2 and the drive motor generator battery negative terminal. If greater than the specified range, replace the drive motor negative relay cable.
  6. Test for less than 5 ohms between the high voltage positive contactor terminal X2 and drive motor generator battery positive terminal. If greater than the specified range, replace the drive motor positive relay cable.
  7. Disconnect the X5 harness connector at the drive motor generator battery control module.
  8. Test for less than 5 ohms between the high voltage negative contactor terminal X3 and the ground terminal 5 X5. If greater than the specified range, replace the drive motor battery positive and negative cable.
  9. Test for less than 5 ohms between the high voltage positive contactor terminal X3 and drive motor generator battery control module terminal 1 X5. If greater than the specified range, replace the drive motor positive and negative cable.
  10. Disconnect the X4 harness connector at the drive motor generator battery control module.
  11. Connect the EL-48571 high voltage battery pin out box. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  12. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.
  13. Each battery voltage reading should be between 10-19 V. If not within the specified range, replace the drive motor battery assembly.
  14. Each battery voltage reading should be within 1.5 V of each other. If not within the specified range, replace the drive motor battery assembly.
  15. If all circuits test normal, replace the drive motor generator battery control module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Drive Motor Battery Negative High Voltage Contactor Relay Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  2. «Drive Motor Battery Positive High Voltage Contactor Relay Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  3. «Drive Motor Battery Positive and Negative Cable Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  4. «Drive Motor Generator Battery Replacement and Shipping Preparation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  5. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for drive motor generator battery control replacement, setup and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5 V ReferenceP1A07P0AC1P1A07
SignalP0AC1P0AC2P0AC2, P1A07
Low ReferenceP0AC2

The hybrid battery current sensor is mounted inside the drive motor generator battery assembly. The positive high voltage cable that goes to the positive contactor relay passes through the current sensor. The current sensor detects the amperage that flows in and out of the hybrid batteries. The drive motor generator battery control module supplies and monitors a 5 V reference signal to the current sensor. The current sensor returns a signal between 0 and 5 V to the drive motor generator battery control module. The current sensor signal is in proportion to the amperage going in and out of the drive motor generator battery. A signal voltage of the current sensor greater than 2.5 V indicates that the drive motor generator battery is being discharged and a signal voltage less than 2.5 V indicates charging. The hybrid battery current sensor has 3 measurement ranges in order to maintain accuracy. The ranges are low, medium and high. The measurement ranges of the current sensor have some overlap with each other. The low range measures from -22 to +22 A. The medium range measures from -52 to +52 A. The high range measures from -250 to +250 A.

  1. The ignition is ON.
  2. The 12 V battery is 9-18 V.

P0AC0

One of the following conditions exists

  1. The drive motor generator battery control module detects greater than 5 A on the current sensor after a successful high voltage system power down and after the contactors have opened.
  2. The drive motor generator battery control module detects an increase in total pack voltage greater than 10 V and the current sensor measures less than a 0.5 A increase.
  3. The drive motor generator battery control module detects less than 20 A on the high range sensor and the difference between the high range current measurement and the medium range current measurement is greater than 20 A for 3 seconds.
  4. The drive motor generator battery control module detects less than 20 A on the high range sensor and the difference between the high range current measurement and the low range current measurement is greater than 4 A for 3 seconds.

P0AC1

The drive motor generator battery control module detects that the current sensor high range is greater than +200 A and the current sensor medium range is greater than +52 A and the current sensor low range is greater than +22 A for 3 seconds.

P0AC2

The drive motor generator battery control module detects that the current sensor high range is less than -200 A and the current sensor medium range is less than -52 A and the current sensor low range is greater than -22 A for 3 seconds.

P1A07

The drive motor generator battery control module detects less than 4.8 V or greater than 5.2 V on the 5 V reference circuit.

  1. DTC P0AC0, P0AC1, P0AC2, and P1A07 are type A DTCs.
  2. The driver information center (DIC) displays the SERVICE HYBRID SYSTEM message.
  3. State of charge goes to invalid.
  4. The drive motor generator battery control module sends a message to the hybrid powertrain control module requesting that the hybrid battery power limit be set to 3 kilowatts, resulting in minimal hybrid function.

DTC P0AC0, P0AC1, P0AC2, and P1A07 are type A DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

DTC Type Reference

Special Tools

EL-48900 HEV Safety Kit

Ignition ON, observe the scan tool Calc. Hybrid Batt. Current parameter. The reading should be between -200 and +200 A, and change with the amount of current draw on the drive motor generator battery.

  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  2. Disconnect the harness connector at the current sensor.
  3. Ignition OFF and scan tool disconnected for 30 seconds, test for less than 5 ohms between the low reference circuit terminal 2 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module.
  4. Connect the 12 V battery.
  5. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground. If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module. If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the drive motor generator battery control module.
  6. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the low reference circuit terminal 2. Verify the scan tool Calc. Hybrid Batt. Current is greater than +225 A. If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module.
  7. If all circuits test normal, replace the current sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Drive Motor Battery Current Sensor Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  2. «Drive Motor Battery Sensor Module Wiring Harness Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  3. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for drive motor generator battery control module replacement, setup and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
ControlP0ADBP0ADCP0ADC
GroundP0ADC

The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through serial data. The hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.

The hybrid drive motor generator battery contains 3 high voltage contactors. The contactors allow the high voltage DC batteries to be connected to the vehicle or safely contain the DC high voltage within the drive motor generator battery assembly. The 3 contactors are a positive high voltage contactor, negative high voltage contactor, and current limit relay. These contactor/relays close and open in sequence and are controlled by the drive motor generator battery control module. The drive motor generator battery control module monitors the control circuit voltage and 12 V reference circuit internal to the control module to determine if the circuit is operating.

P0ADB

  1. The ignition is ON.
  2. The jump assist function is not active.
  3. The 12 V battery voltage is 9-18 V.
  4. High voltage contactors are commanded closed.

P0ADC

  1. The 12 V battery voltage is 9-18 V.
  2. High voltage contactors are commanded open.

P0ADB

The drive motor generator battery control module compares the contactor control circuit to the drive motor generator battery control modules internal 12 V measurement reference circuit. This DTC sets when the contactor control circuit voltage is 2 V less than the drive motor generator battery control module internal voltage reference when the high voltage positive contactor is commanded closed.

P0ADC

The drive motor generator battery control module compares the contactor control circuit to the drive motor generator battery control modules internal 12 V measurement reference circuit. This DTC sets when the contactor control circuit voltage and the drive motor generator battery control modules internal voltage reference are within 2 V of each other when the high voltage positive contactor is commanded open.

DTCs P0ADB and P0ADC are type C DTCs.

DTCs P0ADB and P0ADC are type C DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

Testing Verify that DTC P0ADB or P0ADC is not set.

  1. If any of the DTCs are set, refer to «High Voltage Contactor/Relay Malfunction»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) .
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
ControlP0ADFP0AE0P0AE0
GroundP0AE0

The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through serial data. The hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.

The hybrid drive motor generator battery contains 3 high voltage contactors. The contactors allow the high voltage DC batteries to be connected to the vehicle or safely contain the DC high voltage within the drive motor generator battery assembly. The 3 contactors are a positive high voltage contactor, negative high voltage contactor, and current limit relay. These contactor/relays close and open in sequence and are controlled by the drive motor generator battery control module. The drive motor generator battery control module monitors the control circuit voltage and 12 V reference circuit internal to the control module to determine if the circuit is operating.

P0ADF

  1. The ignition is ON.
  2. The jump assist function is not active.
  3. The 12 V battery voltage is 9-18 V.
  4. The negative contactor is commanded closed.

P0AE0

  1. The 12 V battery voltage is 9-18 V.
  2. The negative contactor is commanded open.

P0ADF

The control circuit voltage is 2 V less than B+ when the negative contactor relay is commanded closed.

P0AE0

The control circuit voltage is within 2 V of B+ when the negative contactor relay is commanded open.

DTCs P0ADF and P0AE0 are type C DTCs.

DTCs P0ADF and P0AE0 are type C DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

DTC Type Reference

Special Tools

EL-48900 HEV Safety Kit

Verify that DTC P0ADF or P0AE0 is not set.

  1. If any of the DTCs are set, refer to «High Voltage Contactor/Relay Malfunction»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) .
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
ControlP0AE7P0AE7
GroundP0AE7

The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through serial data. The hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.

The hybrid drive motor generator battery contains 3 high voltage contactors. The contactors allow the high voltage DC batteries to be connected to the vehicle or safely contain the DC high voltage within the drive motor generator battery assembly. The 3 contactors are a positive high voltage contactor, negative high voltage contactor, and current limit relay. These contactor/relays close and open in sequence and are controlled by the drive motor generator battery control module. The drive motor generator battery control module monitors the control circuit voltage and 12 V reference circuit internal to the control module to determine if the circuit is operating.

  1. The ignition is ON.
  2. The 12 V battery voltage is 9-18 V.
  3. The current limit relay is commanded open.

This DTC sets when the high voltage current limit relay control circuit voltage and the drive motor generator battery control modules internal voltage reference are within 2 V of each other when the current limit relay is commanded open.

  1. DTC P0AE7 is a type C DTC.
  2. After 2 failed high-voltage precharge events, a 20-40 minute precharge wait time is activated by the drive motor generator battery control module.

DTC P0AE7 is a type C DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

Verify that DTC P0AE7 is not set.

  1. If the DTC is set, refer to «High Voltage Contactor/Relay Malfunction»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) .
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The system contains twenty battery modules. Each module contains two 7.2 V cells for a total nominal system voltage of 288 V. Each battery module is rated at 14.4 V direct current (DC) and all the modules are connected together in series. The drive motor generator battery is also referred to as the hybrid battery. The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module monitors the hybrid battery voltage on the twenty battery modules. The drive motor generator battery control module determines the actual terminal voltage by monitoring the output voltage from the high voltage contactors.

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

  1. The ignition is ON.
  2. The 12 V battery voltage is 9-18 V.
  3. High voltage contactors are closed.

DTCs P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C, P0B91, P0B96

The voltage of any two consecutive batteries multiplied by 20 is 70 V greater than or less than the total pack voltage for 16 seconds.

DTC P0B9B

The voltage of battery 20 multiplied by 20 is 70 V greater than or less than the total pack voltage for 16 seconds. DTC P0B9B only requires one voltage failure because battery 20 is the last battery.

  1. DTCs P0B3D, P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88, P0B8D, P0B92, P0B97, and P0B9C are type B DTCs.
  2. The drive motor generator battery control module commands the battery vent fan to high speed.
  3. If more than 4 of these DTCs are set, the drive motor generator battery sends a message to the hybrid powertrain control module to reduce the power use limit to 50 percent.

DTCs P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C, P0B91, P0B96, and P0B9B are type B DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. EL-48571 High Voltage Battery Pin Out Box. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  2. EL-48900 HEV Safety Kit

Ignition ON, observe the scan tool Hybrid Battery 1-20 parameters. Each reading should be between 10-19 V, and all readings should be within 1.5 V of each other.

  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  2. Disconnect the X4 harness connector at the drive motor battery control module.
  3. Connect to the EL-48571 high voltage battery pin out box. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  4. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.
  5. Each battery voltage reading should be between 10-19 V. If not within the specified range, replace the drive motor battery assembly.
  6. Each battery voltage reading should be within 1.5 V of each other. If not within the specified range, replace the drive motor battery assembly.
  7. If all circuits test normal, replace the drive motor battery control module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Drive Motor Generator Battery Replacement and Shipping Preparation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  2. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for drive motor generator battery control module replacement, setup and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The system contains twenty battery modules. Each module contains two 7.2 V cells for a total nominal system voltage of 288 V. Each battery module is rated at 14.4 V direct current (DC) and all the modules are connected together in series. The drive motor generator battery is also referred to as the hybrid battery. The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module monitors the hybrid battery voltage on the twenty battery modules. The drive motor generator battery control module determines the actual terminal voltage by monitoring the output voltage from the high voltage contactors.

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

  1. DTC P0A1F is not set.
  2. The ignition is ON.
  3. The 12 V battery voltage is 9-18 V.

P0B3D, P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88, P0B8D, P0B92, and P0B97

Any two consecutive hybrid battery voltages are less than 7.5 V for 1.5 seconds.

P0B9C

Hybrid battery number 20 voltage is less than 7.5 V for 1.5 seconds. DTC P0B9C only requires one voltage failure because battery 20 is the last battery.

  1. DTCs P0B3D, P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88, P0B8D, P0B92, P0B97, and P0B9C are type B DTCs.
  2. The drive motor generator battery control module commands the battery vent fan to high speed.
  3. If more than 4 of these DTCs are set, the drive motor generator battery control module sends a message to the hybrid powertrain control module to reduce the power use limit to 50 percent.

DTCs P0B3D, P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88, P0B8D, P0B92, P0B97, and P0B9C are type B DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. EL-48571 High Voltage Battery Pin Out Box. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  2. EL-48900 HEV Safety Kit

Ignition ON, observe the scan tool Hybrid Battery 1-20 parameters. Each reading should be between 10-19 V, and all readings should be within 1.5 V of each other.

  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  2. Disconnect the X4 harness connector at the drive motor battery control module.
  3. Connect the EL-48571 high voltage battery pin out box. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  4. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.
  5. Each battery voltage reading should be between 10-19 V. If not within the specified range, replace the drive motor battery assembly.
  6. Each battery voltage reading should be within 1.5 V of each other. If not within the specified range, replace the drive motor battery assembly.
  7. If all circuits test normal, replace the drive motor generator battery control module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Drive Motor Generator Battery Replacement and Shipping Preparation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  2. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for drive motor generator battery control module replacement, setup and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The system contains twenty battery modules. Each module contains two 7.2 V cells for a total nominal system voltage of 288 V. Each battery module is rated at 14.4 V direct current (DC) and all the modules are connected together in series. The drive motor generator battery is also referred to as the hybrid battery. The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module monitors the hybrid battery voltage on the twenty battery modules. The drive motor generator battery control module determines the actual terminal voltage by monitoring the output voltage from the high voltage contactors.

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

  1. DTC P0A1F is not set.
  2. The ignition is ON.
  3. The 12 V battery voltage is 9-18 V.

Any hybrid battery voltage signal is greater than 23 V for 1.5 seconds.

  1. DTCs P0B3E, P0B43, P0B48, P0B4D, P0B52, P0B57, P0B5C, P0B61, P0B66, P0B6B, P0B70, P0B75, P0B7A, P0B7F, P0B84, P0B89, P0B8E, P0B93, P0B98, and P0B9D are type B DTCs.
  2. The drive motor generator battery control module commands the battery vent fan to high speed.
  3. If more than 4 of these DTCs are set, the drive motor generator battery control module sends a message to the hybrid powertrain control module to reduce the power use limit to 50 percent.

DTCs P0B3E, P0B43, P0B48, P0B4D, P0B52, P0B57, P0B5C, P0B61, P0B66, P0B6B, P0B70, P0B75, P0B7A, P0B7F, P0B84, P0B89, P0B8E, P0B93, P0B98, and P0B9D are type B DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. EL-48571 High Voltage Battery Pin Out Box. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  2. EL-48900 HEV Safety Kit

Ignition ON, observe the scan tool Hybrid Battery 1-20 parameters. Each reading should be between 10-19 V and all readings should be within 1.5 V of each other.

  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  2. Disconnect the X4 harness connector at the drive motor battery control module.
  3. Connect the EL-48571 high voltage battery pin out box. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  4. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.
  5. Each battery voltage reading should be between 10-19 V. If not within the specified range, replace the drive motor battery assembly.
  6. Each battery voltage reading should be within 1.5 V of each other. If not within the specified range, replace the drive motor battery assembly.
  7. If all circuits test normal, replace the drive motor generator battery control module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Drive Motor Generator Battery Replacement and Shipping Preparation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  2. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for drive motor generator battery control module replacement, setup and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The system contains twenty battery modules. Each module contains two 7.2 V cells for a total nominal system voltage of 288 V. Each battery module is rated at 14.4 V direct current (DC) and all the modules are connected together in series. The drive motor generator battery is also referred to as the hybrid battery. The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module monitors the hybrid battery voltage on the twenty battery modules. The drive motor generator battery control module determines the actual terminal voltage by monitoring the output voltage from the high voltage contactor.

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

  1. DTC P0A1F is not set.
  2. The ignition is ON.
  3. The 12 V battery voltage is 9-18 V.
  4. Minimum hybrid battery temperature is greater than -7°C (19.4°F).
  5. Hybrid battery discharge current is greater than 0.2 A.

The drive motor generator battery control module detects greater than a 1.5 V difference between any two hybrid battery voltage measurements for 3 seconds. However, if any DTCs P0B3C-P0B9D are set, the corresponding battery voltage measurement is ignored by this DTC.

  1. DTC P0BBD is a type B DTC.
  2. The drive motor generator battery control module sends a message to the hybrid powertrain control module to reduce the power use limit to 3000 watts.
  3. The driver information center (DIC) displays the SERVICE HYBRID SYSTEM message.
  1. DTC P0BBD is a type B DTC.
  2. The DTC will pass when the voltage of all hybrid batteries are within 1 V of each other.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. EL-48571 High Voltage Battery Pin Out Box. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  2. EL-48900 HEV Safety Kit

Ignition ON, observe the scan tool Hybrid Battery 1-20 parameters. Each reading should be between 10-19 V, and all readings should be within 1.5 V of each other.

  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  2. Disconnect the X4 harness connector at the drive motor battery control module.
  3. Connect the EL-48571 high voltage battery pin out box. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  4. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.
  5. Each battery voltage reading should be between 10-19 V. If not within the specified range, replace the drive motor battery assembly.
  6. Each battery voltage reading should be within 1.5 V of each other. If not within the specified range, replace the drive motor battery assembly.
  7. If all circuits test normal, replace the drive motor generator battery control module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Drive Motor Generator Battery Replacement and Shipping Preparation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  2. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for drive motor generator battery control module replacement, setup and programming.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through the serial data. The hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.

The drive motor generator power inverter module assembly (PIM) contains capacitors and a resistor circuit intended to discharge the electrical energy stored within the capacitors. Whenever the high voltage contactors are opened, the hybrid powertrain control module connects an internal resistor circuit across the high voltage positive and negative circuits. If high voltage is detected monitored by the hybrid powertrain control module after the resistor circuit has been connected, the hybrid powertrain control module commands the motor control modules (MCMs) to connect the motor phase circuits across the DC high voltage positive and negative circuits. If high voltage is monitored by the hybrid powertrain control module after the motor phase circuits have been connected, indicating a stuck-closed contactor, this DTC will set.

  1. Ignition OFF, during high voltage shutdown.
  2. Ignition voltage is 9-18 V.

High voltage has been detected by the hybrid powertrain control module after the contactors have been commanded to open.

DTC P0C76 is a Type C DTC.

  1. DTC P0C76 is a Type C DTC.
  2. To clear this DTC from the hybrid powertrain control module, you must use the scan tool Special Functions, under the HPCM special functions Clear 300V Present DTC, only after the repair is complete.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)

Scan Tool Reference

Control Module References for scan tool information

DTC Type Reference

Special Tools

EL-48900 HEV Safety Kit

Verify that P0C76 is not set.

  1. If DTC is set, refer to «High Voltage Contactor/Relay Malfunction»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) .
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through serial data. The hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.

The drive motor generator battery contains 3 high voltage contactors that allow the high voltage direct current (DC) batteries to be connected to the vehicle or safely contain the DC high voltage within the drive motor generator battery assembly. The three contactor/relays are a positive high voltage contactor, negative high voltage contactor, and the current limit relay.

The power-up sequence for the high voltage DC system occurs in the following order

  1. The drive motor generator battery control module performs a precharge test, by closing both the negative contactor and current limit relay. Because the current limit relay routes the high voltage current through a current limit resistor, the hybrid battery terminal voltage should increase at a steady, predictable rate.
  2. When the drive motor generator battery control module observes that hybrid battery terminal voltage and hybrid battery calculated voltage are at about the same voltage, the motor generator battery control module closes the positive contactor.
  3. With both the negative and positive contactors closed, the drive motor generator battery control module opens the current limit relay.

P0C77

  1. Ignition voltage is 9-18 V at the drive motor generator battery control module.
  2. The current limit relay and negative contactor are commanded closed by the hybrid powertrain control module.
  3. The terminal voltage is less than 60 V prior to starting the precharge sequence.

P1A20

  1. Ignition voltage is 9-18 V at the drive motor generator battery control module.
  2. There are less than 4 hybrid battery voltage sensor faults.

P0C77

One of the following conditions exist

  1. The high voltage DC current is greater than 25 A during precharge.
  2. Within 20 milliseconds of the start of precharge, hybrid battery calculated voltage and powertrain inverter module terminal voltage are already within 23 V of each other.

P1A20

140 milliseconds after the start of precharge, hybrid battery calculated voltage and hybrid battery terminal voltage are 23 V apart.

  1. DTCs P0C77 and P1A20 are type C DTCs.
  2. The hybrid powertrain control module will not command the high voltage contactors closed.

DTCs P0C77 and P1A20 are type C DTCs.

Note. If the high voltage contactors opened while under high current load, replace BOTH high voltage contactors. 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 collision that activates the high voltage circuit impact detection (HVCID) sensor. A high voltage circuit impact detection sensor circuit fault that occurs while the vehicle is moving. A loss of power or ground to the drive motor generator battery control module while the vehicle is moving.

The precharge time can be affected by the following

  1. A long precharge time may be caused by an open 125 A fuse in the manual disconnect lever
  2. A short precharge time may be caused by a positive high voltage contactor stuck.
  3. A negative high voltage contactor stuck closed will not affect the precharge sequence.

A long or short precharge time may cause any of the following

The drive motor generator battery control module will start a precharge wait timer after failing 2 consecutive precharge events. The contactors will not close until the precharge wait time has timed out.

Schematic Reference

  1. «Hybrid Energy Storage Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  2. «Hybrid Controls Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#hybrid-engine-controls-wiring-schematics)

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. EL-48458 HV Precharge Tester
  2. EL-48569 Terminal Covers. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  3. EL-48900 HEV Safety Kit
WARNINGAlways perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  2. Disconnect the air conditioning control module terminal X4 B+ (300 V) and terminal X5 ground (300 V).
  3. Test for infinite resistance between the terminals listed below and ground; X4 B+ (300 V) cable X5 ground (300 V) cable If less than the specified value, replace the air conditioning control module assembly.
  4. Test for greater than 50k ohms between the B+ (300 V) terminals X4 and ground (300 V) X5. If less than the specified range, test the circuits for a short between the circuits. If the circuits test normal, replace the air conditioning control module assembly.
  5. Connect the EL-48458 at the drive motor generator power inverter module. Refer to the EL-48458 installation procedure located in «High Voltage System Diagnosis (EL-48458)»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-symptom-troubleshooting-diagnosis) .
  6. Install the manual disconnect lever.
  7. Connect the 12 V battery.
  8. Ignition ON, attempt to precharge the high voltage system by moving the high voltage contactor relay switch on the tester to the closed position. Verify that the hi-voltage greater than 60 V LED does not illuminate. If the LED illuminates, replace the drive motor generator power inverter module.
  9. Ignition OFF, remove the EL-48458 . Refer to the removal procedure located in «High Voltage System Diagnosis (EL-48458)»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-symptom-troubleshooting-diagnosis) .
  10. Ignition OFF, disconnect the X1 B+ (300 V) and X2 ground (300 V) cables from the drive motor generator battery.
  11. Test for infinite resistance between the terminals listed below and ground X1 B+ (300 V) cable X2 ground (300 V) cable If less than the specified value, replace the high voltage cables.
  12. Ignition ON, command the negative and positive contactors and the current limit relay ON and OFF with a scan tool. Listen for the contactors and relay to turn ON and OFF. If the negative contactor, positive contactor or the current limit relay does not turn ON and OFF, refer to «High Voltage Contactor/Relay Malfunction»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) .
  13. Ignition OFF, visually inspect and test the drive motor generator battery internal high voltage DC cables and connections for a short to ground or an open/high resistance condition. If a short to ground or an open/high resistance condition is found on the high voltage cables or connection points, replace the drive motor generator battery cable.
  14. If all the circuit tests normal, replace the drive motor generator battery assembly.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Drive Motor Battery Negative Relay Cable Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  2. «Drive Motor Battery Positive Relay Cable Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  3. «Drive Motor Battery Positive and Negative Cable Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  4. «Drive Motor Battery 300-Volt Positive and Negative Cable Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  5. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for drive motor generator battery control module, drive motor generator power inverter module, air conditioning control module assembly replacement, setup and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through serial data. The hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information. The drive motor generator battery control module continuously monitors the system voltage on the ignition 1 voltage circuit.

  1. The vehicle power mode is RUN.
  2. DTC P0A1F is not set.

P1A0C

The drive motor generator battery control module detects the ignition voltage is less than 9 V for 3 seconds.

P1A0D

The drive motor generator battery control module detects the ignition voltage is greater than 16 V for 3 seconds.

P1A0C

  1. DTCs P1A0C and P1A0D are Type C DTCs.
  2. The drive motor generator battery control module commands the battery vent fan to High.

P1A0D

  1. DTCs P1A0C and P1A0D are Type C DTCs.
  2. The drive motor generator battery control module commands the battery vent fan to High.
  3. After 8 minutes of ignition voltage over 16 V, the high voltage contactor coils will become hot and the drive motor generator battery control module will open the contactors. The drive motor generator battery control module will not close the high voltage contactors for 30 minutes to allow high voltage contactors to cool.
  1. DTCs P1A0C and P1A0D are Type C DTCs.
  2. The control module ignition voltage is between 9-16 V.

Observe the driver information center (DIC) messaging that would indicate the charging system requires service.

Inspect for the following conditions

  1. Loose or poor connections at the hybrid drive motor battery X350 18-way connector.
  2. Loose or poor connections at the 12 V negative battery cable G102.
  3. Verify that the 12 V battery and charging system is within normal operating range and if a battery charger was connected to the vehicle.
  4. Loose or damaged battery terminals.
  5. Loose or corroded connections at the accessory dc power control module (APM).

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

  1. Verify that DTC P0A8D or P0A8E is not set. If any of the DTCs are set. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Ignition OFF, measure and record the battery voltage at the battery terminals. The battery voltage should be between 12.4 and 12.8 V within a few minutes of turning the ignition OFF. If not within the specified range, refer to «Battery Inspection/Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .
  3. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be at least 1 V greater than the voltage measured in step 1 but less than 15.5 V. If not within the specified range, refer to «Charging System Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2__charging-system-test) .
  4. Observe the scan tool drive motor generator battery control module, Control Module Voltage parameter. The reading should be within 1 V of the battery voltage.
  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  2. Ignition OFF, disconnect the X1 harness connectors at the drive motor generator battery control module.
  3. Ignition OFF, scan tool disconnected, open and close the driver door and wait 1 minute. Test for less than 5 ohms between the ground circuit terminal 11 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  5. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 12 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the serial data gateway module.
  6. If all circuits test normal, replace the drive motor generator battery control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for drive motor generator battery control module or serial data gateway module replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through serial data. The hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.

The drive motor generator battery control module monitors the calculated battery voltage and the terminal voltage. The calculated voltage represents the sum of the voltages from the 20 individual battery measurements. The terminal voltage represents the total DC bus voltage as measured on the output side of the high voltage contactors.

  1. The vehicle power mode is RUN.
  2. Ignition voltage is 9-18 V.

P1A1F

The calculated battery voltage measurement is less than 168 V for 4 seconds

OR

Individual hybrid battery voltage measurement is less than 8.4 V for 4 seconds.

P1A4E

The calculated battery voltage measurement is greater than 408 V for 4 seconds

OR

Individual hybrid battery voltage measurement is greater than 20.4 V for 4 seconds.

DTCs P1A1F and P1A4E are Type C DTCs.

P1A1F

  1. DTCs P1A1F is a Type C DTC.
  2. The calculated battery voltage measurement is greater than 260 V.
  3. Each individual hybrid battery voltage measurement is greater than 13 V.

P1A4E

  1. DTCs P1A4E is a Type C DTC.
  2. The calculated battery voltage measurement is less than 390 V.
  3. Each individual hybrid battery voltage measurement is less than 19.5 V.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. EL-48571 High Voltage Battery Pin Out Box. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  2. EL-48900 HEV Safety Kit
  1. Verify that DTC P0B3C, P0B3D, P0B3E, P0B41, P0B42, P0B43, P0B46, P0B47, P0B48, P0B4B, P0B4C, P0B4D, P0B50, P0B51, P0B52, P0B55, P0B56, P0B57, P0B5A, P0B5B, P0B5C, P0B5F, P0B60, P0B61, P0B64, P0B65, P0B66, P0B69, P0B6A, P0B6B, P0B6E, P0B6F, P0B70, P0B73, P0B74, P0B75, P0B78, P0B79, P0B7A, P0B7D, P0B7E, P0B7F, P0B82, P0B83, P0B84, P0B87, P0B88, P0B89, P0B8C, P0B8D, P0B8E, P0B91, P0B92, P0B93, P0B96, P0B97, P0B98, P0B9B, P0B9C, P0B9D, or P0ABB is not set. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Ignition ON, engine OFF, verify the scan tool Hybrid Battery Pack Calculated Voltage parameter is 230-407 V.
  3. Observe the scan tool Hybrid Battery 1-20 parameters. Each reading should be between 10-19 V and all readings should be within 1.5 V of each other.
  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  2. Test for 230-407 V between the high voltage positive terminal X2 at the high voltage positive contactor and the high voltage negative terminal X2 at the high voltage negative contactor. If the voltage is less than 194 V, replace the drive motor generator battery. If the voltage is between 194-230 V, perform the jump assist. Refer to «Jump Assist»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) . If the voltage is greater than 407 V, replace the drive motor generator battery control module.
  3. Disconnect the X4 harness connector at the drive motor generator battery control module.
  4. Connect the EL-48571 high voltage battery pin out box. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  5. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.
  6. Each battery voltage reading should be between 10-19 V. If not within the specified range, replace the drive motor battery assembly.
  7. Each battery voltage reading should be within 1.5 V of each other. If not within the specified range, replace the drive motor battery assembly.
  8. If all circuits test normal, replace the drive motor generator battery control module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Drive Motor Generator Battery Replacement and Shipping Preparation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  2. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for drive motor generator battery control module replacement, setup and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through serial data. The hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.

The hybrid powertrain control module controls the operation of the high voltage contactors through communication with the drive motor generator battery control module. The hybrid powertrain control module utilizes a pulse width modulated (PWM) contactor system request circuit and redundant serial data to command the high voltage contactors Open and Closed. Under normal operating conditions, the drive motor generator battery control module opens and closes the high voltage contactors based only upon the hybrid powertrain control module command. This diagnostic identifies when the drive motor generator battery control module has opened the high voltage contactors when the hybrid powertrain control module is commanding them closed.

  1. The vehicle power mode is RUN.
  2. Ignition voltage is 9-18 V.
  3. The vehicle has passed a successful precharge and the high voltage contactors have been closed this ignition cycle.
  4. The hybrid powertrain control module is commanding the drive motor generator battery control module to keep the high voltage contactor closed.

The drive motor generator battery control module reports that the contactors are open when the hybrid powertrain control module contactor system request circuit and the serial data message both indicate a closed request.

DTC P1A21 is a Type A DTC.

DTC P1A21 is a Type A DTC.

  1. The drive motor generator battery control module will set Contactor System Status parameter to OPEN when the Contactor System Request Circuit Command parameter percent duty cycle is 65-75 percent.
  2. The drive motor generator battery control module will set Contactor System Status parameter to CLOSED when the Contactor System Request Circuit Command parameter percent duty cycle is 25-35 percent.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Verify that DTC P1AE4, P0A80, P1ABE, or P1A0C is not set. If any of the DTCs are set, Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Verify that DTC P1A21 is not set. If DTC P1A21 is set, replace the drive motor generator battery control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for drive motor generator battery control module replacement, setup and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Contactor Control SignalP1AE5P1AE5P1AE5P1AE5

Typical Scan Tool Data

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Ignition voltage is 9-18 V, vehicle power mode is RUN Parameter Normal Range: 30% or 70%
Contactor Sys. Req. Ckt. Command0%100%100%

Contactor Sys. Req. Ckt. Command

The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through serial data. The hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.

The drive motor generator battery control module receives a pulse width modulated (PWM) signal from the hybrid powertrain control module called the contactor system request circuit command. The drive motor generator battery control module uses this signal to open and close the high voltage contactors.

  1. The vehicle power mode is RUN.
  2. Ignition voltage is 9-18 V.

Contactor system request circuit command signal is less than 25 percent

OR

Contactor system request circuit command signal is between 35 percent and 65 percent

OR

Contactor system request circuit command signal is greater than 75 percent

OR

The frequency of the contactor system request circuit command signal is not between 247 Hz to 253 Hz for 2 out of 3 seconds.

DTC P1AE5 is a Type C DTC.

DTC P1AE5 is a Type C DTC.

  1. The drive motor generator battery control module will set Contactor System Status parameter to OPEN when the Contactor System Request Circuit Command parameter percent duty cycle is 65-75 percent.
  2. The drive motor generator battery control module will set Contactor System Status parameter to CLOSED when the Contactor System Request Circuit Command parameter percent duty cycle is 25-35 percent.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Verify that DTC P2534 is not set. If the DTC is set, refer to «DTC P2534»(/cadillac/escalade/gmt900-2006-2014/remont/automatic-trans/#automatic-transmission-2ml70-dtc-p0969-to-dtc-p02730p279d) .
  2. Ignition ON, observe the scan tool drive motor generator battery control module, Contactor System Request Circuit Command parameter. The reading should be 25-35 percent.
  3. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
  1. Ignition OFF, disconnect the X1 harness connector at the drive motor generator power inverter module assembly.
  2. Ignition ON, verify that the scan tool Contactor System Request Circuit Command parameter is 100 percent. If not the specified value, test the control circuit terminal 4 for a short to ground. If the circuit tests normal, replace the «Battery Energy Control Module and Bracket Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) .
  3. Install a 3 A fused jumper wire between the control circuit terminal 4 and ground. Verify that the scan tool Contactor System Request Circuit Command parameter is 0 percent. If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module.
  4. If all circuits test normal, replace the drive motor generator power inverter module assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for drive motor generator battery control module, drive motor generator power inverter control module replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through serial data. The hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.

The vehicle is equipped with a high voltage isolation monitor feature. The purpose of the high voltage isolation circuit is to test the resistance between the high voltage positive and negative direct current (DC) bus and chassis ground. The drive motor generator battery control module only runs this test when the ignition transitions from ON to OFF and the high voltage contactor relays have opened. The drive motor generator battery control module has an internal isolation sensor that measures the resistance between the high voltage DC positive and negative bus and chassis ground. The drive motor generator battery control module runs an internal self check of this sensor circuit. If the internal self check fails DTC P1AE6 will set. The drive motor generator battery control module sends an AC signal over the DC bus and monitors its amplitude. A low amplitude or collapsed return signal indicates a loss of resistance to chassis ground and a loss of isolation will be indicated by the drive motor generator battery control module. This DTC indicates that the fault is in the drive motor generator battery. Because this diagnostic runs after system power down, the diagnostic status does not get reported until the next key cycle.

  1. Ignition voltage is 9-18 V.
  2. The ignition switch transitions from ON to OFF.
  3. High voltage contactor transitions to open.

P1AE6

The isolation resistance sensor circuit internal to the drive motor generator battery control module has failed its functional test.

P1AE7

  1. The drive motor generator battery control module has detected a loss of isolation between the high voltage positive or negative bus to chassis ground that is less than 200 k ohms.
  2. This diagnostic may take up to 40 seconds to run after the conditions for running have been met. This DTC will not report the status until the next key cycle.

DTCs P1AE6 and P1AE7 are Type C DTCs.

DTCs P1AE6 and P1AE7 are Type C DTCs.

A single high voltage contactor relay stuck closed can set this DTC.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48900 HEV Safety Kit

  1. Ignition ON, Verify that DTC P1A1F is not set. If the DTC is set, refer to «DTC P1A1F or P1A4E»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) .
  2. Verify that DTC P1AE6 is not set. If the DTC is set, replace the drive motor generator battery control module.
  3. Observe the scan tool 300 V Isolation Test Status parameter. The reading should display Passed.
  4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  2. Test for infinite resistance between the terminals listed below and ground; positive contactor terminal X2 positive contactor terminal X3 negative contactor terminal X2 negative contactor terminal X3 If less than the specified value, replace the high voltage cable.
  3. Test for less than 1 ohms between the terminals listed below; B+ (300 V) and positive contactor terminal X2 Ground (300 V) and negative contactor terminal X2 positive contactor terminal X3 and positive cable terminal X1 negative contactor terminal X3 and negative cable terminal X2 If greater than the specified range, replace the high voltage cable.
  4. Connect the 12 V battery.
  5. Ignition ON, command the negative and positive contactors and the current limit relay ON and OFF with a scan tool. Listen for the contactors and relay to turn ON and OFF. If the negative contactor, positive contactor or the current limit relay does not turn ON and OFF, refer to «High Voltage Contactor/Relay Malfunction»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) .
  6. If all the circuit tests normal, replace the drive motor generator battery.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Drive Motor Battery Negative Relay Cable Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  2. «Drive Motor Battery Positive Relay Cable Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  3. «Drive Motor Battery Positive and Negative Cable Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  4. «Drive Motor Generator Battery Replacement and Shipping Preparation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  5. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for drive motor generator battery control module replacement, setup and programming

Symptoms - Hybrid Energy Storage

IMPORTANTThe following steps must be completed before using the symptom tables.
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following procedures: «Drive Motor Generator Battery Cooling Description»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-cooling-system__drive-motor-generator-battery-cooling-description) . «Drive Motor Battery High Voltage Contactor Relay Operation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__drive-motor-battery-high-voltage-contactor) .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the HVAC System. Refer to «Checking Aftermarket Accessories»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
  3. Blocked or restricted hydrogen battery vent tube may cause drive motor battery odor.
  4. Inspect the air distribution system for blocked or damaged air inlet or outlet ducts, which cause reduced air flow.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. «Drive Motor Generator Battery Odor»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  2. «Drive Motor Generator Battery Noise»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)

Perform a visual inspection of all hoses and manifolds in the venting system for kinks, restrictions and poor connections. This could cause gases to back up and create an odor.

Check all electrical components for signs of overheating this may cause an electrical odor. Check the exhaust duct for proper operation this could cause the hybrid drive motor battery cooling air to be vented to the passenger compartment.

The hybrid drive motor battery has two venting systems. One for battery air cooling and one for venting of the hybrid batteries themselves. The exhaust air from hybrid drive motor battery cooling is routed through a duct and into the floor panel of the vehicle.

The hybrid batteries vent system connects all the battery vents to a rubber manifold that exits the hybrid drive motor battery through a single hose and is vented through the floor panel of the vehicle.

Special Tools

EL-48900 HEV Safety Kit

Ignition ON, command the hybrid drive motor battery fan ON with a scan tool. No odor from the hybrid drive motor battery should be present.

  1. Ignition OFF, inspect the hybrid drive motor battery air inlet and outlet ducts for debris, or for a restriction. If debris or a restriction is found, repair as necessary.
  2. Inspect that the drive motor generator battery exhaust duct and the battery vent tube assembly are properly installed.

Perform a visual inspection of all hoses and manifolds in the venting system for kinks, restrictions, and poor connections. Ensure that the drive motor generator battery exhaust duct and the battery vent tube assembly are properly installed.

The hybrid drive motor generator battery has very few moving parts. The moving parts are the 3 high voltage (HV) contactor relays, the hybrid drive motor battery vent fan relay, and the vent fan motor.

The hybrid drive motor generator battery is an air cooled component. The hybrid drive motor generator battery vent fan and relay are located inside the hybrid drive motor generator battery assembly. The hybrid drive motor battery vent fan relay controls the supply voltage to the cooling vent fan motor. The control circuit for the vent fan relay and the vent fan speed are controlled by the battery energy control module (BECM).

The hybrid drive motor generator battery contains 3 high voltage contactor relays that allow the high voltage (HV) DC batteries to be connected to the vehicle. The three HV contactor relays are a positive HV contactor relay, negative HV contactor relay and the inverter current limit relay. These relays close and open in a certain sequence controlled by the BECM. The control circuit for the relays use a common ground and the BECM provide voltage to turn them on and off individually.

  1. Ignition ON, command the hybrid drive motor battery fan ON and OFF with a scan tool. The fan should not make objectionable noise. Some noise is considered normal.
  2. Ignition ON, command the HV contactors ON and OFF with a scan tool one at a time. The contactors should not make objectionable noise. Some noise is considered normal.
  1. Ignition OFF, inspect the hybrid drive motor battery air inlet and outlet for debris, or for a restriction. If debris or a restriction is found, repair as necessary.
  2. Check for loose and vibrating duct work. If loose or vibrating duct work is found, repair as necessary.
  3. Ignition ON, command the hybrid drive motor battery fan ON and OFF with a scan tool. The fan should not make objectionable noise. If the fan makes excessive noise, replace the hybrid drive motor battery fan.
  4. Command the HV contactors ON and OFF with a scan tool one at a time. The HV contactors should not make objectionable noise, compare to like vehicle. If the HV contactors make objectionable noise check the contactor mounting insulators and torque of mounting fasteners. Tighten and repair as necessary. If the HV contactor has objectionable noise, replace the HV contactor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Generator Battery Vent Fan Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-cooling-system)
  2. «Generator Battery Vent Fan Relay Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-cooling-system)
  3. «Drive Motor Battery Positive High Voltage Contactor Relay Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  4. «Drive Motor Battery Negative High Voltage Contactor Relay Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  5. «Drive Motor Power Inverter Current Limit Relay Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/escalade/gmt900-2006-2014/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/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through serial data. The hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.

The hybrid drive motor generator battery contains 3 high voltage contactor/relays also referred to as high voltage relays. The high voltage contactor/relays allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the drive motor generator battery assembly. The 3 high voltage contactor/relays are a positive high voltage contactor, negative high voltage contactor, and current limit relay. These contactor/relays close and open in sequence and are controlled by the drive motor generator battery control module. The drive motor generator battery control module supplies voltage to the control circuit for the high voltage relays. Ground is provided through the case ground.

Note. If the high voltage contactor/relays opened while under high current load, replace BOTH high voltage contactor/relays. The following conditions could cause the high voltage contactor/relays to open while under high current load: A collision resulting in supplemental inflatable restraint (SIR) deployment. A collision that activates the high voltage circuit impact detection (HVCID) sensor. A high voltage circuit impact detection sensor circuit fault that occurs while the vehicle is moving. A loss of power or ground to the drive motor generator battery control module while the vehicle is moving. DTC P0C76 can only be cleared in the hybrid powertrain control module with a scan tool. After the repair is complete, select the scan tool HPCM special functions, then select Clear 300V Present DTC.

Schematic Reference

  1. «Hybrid Controls Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/body-electrical/#hybrid-engine-controls-wiring-schematics)
  2. «Hybrid Energy Storage Schematics»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/escalade/gmt900-2006-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. EL-48569 Terminal Covers. See «Special Tools»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__special-tools) .
  2. EL-48900 HEV Safety Kit
  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  2. Ignition ON, command the negative contactor ON and OFF with a scan tool while listening for the contactor to turn ON and OFF. The negative contactor should be heard turning ON and OFF. If the negative contactor does not turn ON and OFF, refer to Negative Contactor Diagnosis.
  3. Command the positive contactor ON and OFF with a scan tool while listening for the contactor to turn ON and OFF. The positive contactor should be heard turning ON and OFF. If the positive contactor does not turn ON and OFF, refer to Positive Contactor and Current Limit Relay Diagnosis.
  4. Command the current limit relay ON and OFF with a scan tool while listening for the relay to turn ON and OFF. The current limit relay should be heard turning ON and OFF. If the current limit relay does not turn ON and OFF, refer to Positive Contactor and Current Limit Relay Diagnosis.

Negative Contactor Diagnosis

  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  2. Ignition OFF, disconnect the inline X1 harness connector at the negative contactor.
  3. Test for less than 5 ohms between the ground circuit terminal 2 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Connect a test lamp between the control circuit terminal 1 and ground.
  5. Connect the 12 V battery.
  6. Ignition ON, command the negative contactor open and closed with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the drive motor generator battery control module. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module.
  7. Ignition OFF, disconnect the X2 harness connector at the negative contactor.
  8. Ignition ON, command the negative contactor closed with a scan tool. Test for less than 2 ohms between terminals X2 and X3 of the negative contactor. If greater than the specified range, replace the high voltage negative contactor.
  9. Ignition OFF, test for infinite resistance between terminals X2 and X3 at the negative contactor. If less than the specified value, replace the high voltage negative contactor.
  10. DTC P0ADB, P0ADC, P0ADF, P0AE0, P0AE7, P0C76, P0C77, or P1A20 should not be set. If DTC P0C76 is set, replace the hybrid powertrain control module. If DTC P0ADB, P0ADC, P0ADF, P0AE0, P0C77 or P1A20 is set, replace the drive motor generator control module.

Positive Contactor and Current Limit Relay Diagnosis

  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  2. Ignition OFF, test for 11-13 ohms between terminal X2 at the positive contactor and terminal X3 connectors at the current limit relay. If less than the specified range, replace the current limit resistor.
  3. Ignition OFF, disconnect the X2 harness connector at the current limit relay.
  4. Test for less than 5 ohms between the ground circuit terminal 6 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  5. Disconnect the X1 harness connector at the current limit relay.
  6. Connect a test lamp between the control circuit terminal 5 X1 and ground.
  7. Connect the 12 V battery.
  8. Ignition ON, command the current limit relay open and closed with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the drive motor generator battery control module. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module.
  9. Ignition OFF, disconnect the X3 harness connector at the current limit relay.
  10. Ignition ON, command the current limit relay closed with a scan tool. Test for less than 2 ohms between terminals X3 and X4 of the current limit relay. If greater than the specified range, replace the high voltage current limit relay.
  11. Ignition OFF, test for infinite resistance between the high voltage current limit relay terminals X3 and X4. If not the specified value, replace the high voltage current limit relay.
  12. Ignition OFF, disconnect the X1 harness connector at the positive contactor.
  13. Test for less than 5 ohms between the ground circuit terminal 2 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  14. Connect a test lamp between the control circuit terminal 1 and ground.
  15. Ignition ON, command the positive contactor open and closed with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the drive motor generator battery control module. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module.
  16. Ignition OFF, disconnect the X2 harness connector at the positive contactor.
  17. Ignition ON, command the positive contactor closed with a scan tool. Test for less than 2 ohms between terminals X2 and X3 of the positive contactor. If greater than the specified range, replace the high voltage positive contactor.
  18. Ignition OFF, test for infinite resistance between the high voltage positive contactor terminals X2 and X3. If not the specified range, replace high voltage positive contactor.
  19. DTC P0ADB, P0ADC, P0ADF, P0AE0, P0AE7, P0C76, P0C77, or P1A20 should not be set. If DTC P0C76 is set, replace the hybrid powertrain control module. If DTC P0ADB, P0ADC, P0ADF, P0AE0, P0AE7, P0C77 or P1A20 is set, replace the drive motor generator control module.

Component Testing

Negative and Positive Contactor Test

  1. Ignition OFF, perform the high voltage disable procedure. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  2. Remove the appropriate high voltage contactor.
  3. Test for 20-35 ohms between the control terminal 1 and the ground terminal 2. If not within the specified range, replace the high voltage contactor.
  4. Test for infinite resistance between the following terminals: X2 and 1 X1 X2 and X3 X2 and 2 X1 2 X1 and X3 If not within the specified value, replace the high voltage contactor.
  5. Install a 20 A fused jumper wire between the relay terminal 1 X1 and 12 V. Install a jumper wire between terminal 2 X1 and ground. Test for less than 2 ohms between terminals X2 and X3. If not within the specified range, replace the high voltage contactor.

Current Limit Relay

  1. Ignition OFF, perform the high voltage disable procedure. Refer to «High Voltage Disabling»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system__high-voltage-disabling) .
  2. Remove the current limit relay.
  3. Test for 55-75 ohms between the control terminal 1 and the ground terminal 2. If not within the specified range, replace the high voltage current limit relay.
  4. Test for infinite resistance between the following terminals: 1 X3 and 5 X1 1 X3 and 2 X4 1 X3 and 6 X2 6 X2 and 2 X4 If not within the specified value, replace the high voltage current limit relay.
  5. Install a 20 A fused jumper wire between relay terminal 5 X1 and 12 V. Install a jumper wire between relay terminal 6 X2 and ground. Test for less than 2 ohms between terminals 1 X3 and 2 X4. If not within the specified range, replace the high voltage current limit relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Drive Motor Battery Positive High Voltage Contactor Relay Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  2. «Drive Motor Battery Negative High Voltage Contactor Relay Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  3. «Drive Motor Power Inverter Current Limit Relay Replacement»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  4. «Drive Motor Generator Battery Replacement and Shipping Preparation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system)
  5. «Control Module References»(/cadillac/escalade/gmt900-2006-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) drive motor generator control module or hybrid powertrain control module replacement, setup and programming

Procedure Description

During certain conditions such as long term vehicle storage, the drive motor battery may discharge to such a state that cranking of the engine is not possible.

Jump Assist is a procedure that allows the accessory DC power control module (APM) to convert 12V energy into 300V energy to charge the drive motor battery. Jump Assist is initiated with a scan tool output control. For the duration of the Jump Assist Procedure, the APM, hybrid powertrain control module (HPCM) and the battery energy control module (BECM) remain awake and communicating while the ignition is OFF.

Description and Operation

Required Tools

  1. Tech 2 Scan Tool
  2. 12 Volt DC Battery Charger rated at greater than 20 amps continuous

Vehicle Set-up Procedure

  1. Ensure the 12 volt DC accessory battery is completely charged and tested. Refer to «Battery Inspection/Test»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-engine-electrical-system-hp2) .
  2. Turn the ignition OFF.
  3. Connect a 12 volt DC battery charger to the vehicles 12 volt jump start locations ensuring that an electrically secure connection is made. The Jump Assist will abort if the 12 volt DC accessory battery voltage drops below 11.1 volts.
  4. Plug in the 12 volt DC battery charger and make certain that it is in the highest continuous CHARGE, but not START, state available. If required, turn the Charger ON.
  5. Proceed to Charging Procedure.

Charging Procedure

  1. Turn the ignition key to the RUN position.
  2. Observe and record the BECM Hybrid Battery Pack Calculated voltage scan tool parameter. You should observe greater than 194 volts. If the voltage is less than 194 volts, Jump Assist will not initiate and the drive motor generator battery must be replaced. Refer to «Drive Motor Generator Battery Replacement and Shipping Preparation»(/cadillac/escalade/gmt900-2006-2014/remont/charging-system/#hybrid-energy-storage-system) .
  3. Observe and record the APM HPCM 300 V Circuit voltage scan tool parameter. Compare the BECM Hybrid Battery Pack Calculated voltage value to the HPCM 300V Circuit voltage parameter. You should observe both parameters are within 30 volts. If the parameters are not within the specification, the high voltage contactor relays have not closed. Diagnose the DTCs that have opened the high voltage contactor relays. Refer to «Diagnostic System Check - Vehicle»(/cadillac/escalade/gmt900-2006-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) .
  4. Upon activation of Jump Assist, the Driver Information Center (DIC) display will transition from the current message such as "HOOD OPEN" to "JUMP ASSIST READY TURN KEY OFF". Do not turn the ignition OFF without first turning OFF the scan tool or the procedure may fail to initialize. Perform the following steps in exact order: Initiate the APM Jump Assist output control with the scan tool. You should observe the READY message on the DIC. Turn the scan tool OFF. Turn the ignition key to the OFF position. Jump Assist will initiate and a transfer of energy between the 12 volt DC battery charger and the drive motor generator battery will occur through the APM. The DIC should display "JUMP ASSIST ACTIVE BATTERY CHARGING".
  5. While leaving the ignition OFF, turn the scan tool ON and observe the BECM Calc. Hybrid Batt. Current parameter. Estimate the total amount of time for a successful Jump Assist using the Jump Assist Current vs. Time table shown below.
  6. Continue with Jump Assist until the estimated time has elapsed or the DIC displays either JUMP ASSIST COMPLETE or JUMP ASSIST ABORTED. If the estimated time has elapsed or the DIC displays the "JUMP ASSIST COMPLETE" message the drive motor battery should have sufficient charge to start the engine. If the DIC displays the "JUMP ASSIST ABORTED" message, one of the following conditions has occurred. Repair the condition and restart Jump Assist if necessary. The 12 volt circuit was not maintained at greater than 11.0 volts The HPCM stored a DTC which resulted in the opening of the high voltage contactor relays The drive motor generator battery voltage is greater than 358 volts or less than 180 volts The ignition key was turned to the RUN position while the Jump Assist output control was active
  7. Turn the ignition ON. The DIC may display JUMP ASSIST ABORTED.
  8. Attempt to start the engine. If the engine cranks and runs, drive the vehicle for at least 20 minutes to allow the BECM to relearn drive motor battery state of charge. If the engine does not crank, refer to «Engine Will Not Crank»(/cadillac/escalade/gmt900-2006-2014/remont/engine-control-systems/#hybrid-engine-controls-symptom-troubleshooting-diagnosis) .
Calc. Hybrid Battery Current (Amps)*Time (Minutes)
0.25 Amps228 minutes
0.50 Amps114 minutes
0.90 Amps63 minutes
1.40 Amps41 minutes
1.90 Amps30 minutes
2.40 Amps24 minutes
2.90 Amps20 minutes
*Depending upon model year, hybrid battery current may be displayed as a negative value when charging during Jump Assist.

Jump Assist Current vs Time

Scheme 18

Scheme 18: Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement
Scheme 18: Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedure: Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling .
1Drive Motor Battery Case Upper Cover Bolt (Qty: 21) CAUTION: Refer to Fastener Caution . Tighten: 8 N.m (71 lb in)
2Drive Motor Battery Case Upper Cover Nut (Qty: 5) Tighten: 8 N.m (71 lb in)
3Drive Motor Battery Case Upper Cover
4Drive Motor Battery Case Front Cover Bolt (Qty: 9) Tighten: 8 N.m (71 lb in)
5Drive Motor Battery Case Front Cover Push Rivet
6Drive Motor Battery Case Front Cover
7Drive Motor Battery Case Right Side Cover Bolt (Qty: 2) Tighten: 8 N.m (71 lb in)
8Drive Motor Battery Case Right Side Cover Nut (Qty: 2) Tighten: 8 N.m (71 lb in)
9Drive Motor Battery Case Right Cover Procedure: After the covers have been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling .
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .

Scheme 19

Scheme 19: Drive Motor Battery Cable Terminal Extension Replacement
Scheme 19: Drive Motor Battery Cable Terminal Extension Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures: Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the upper cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement . Remove the disconnect knob housing. Refer to Drive Motor Battery High Voltage Manual Disconnect Knob Housing Replacement .
1Drive Motor Battery Cable Terminal Extension Fasteners Tighten: 6 N.m (53 lb in)
2Drive Motor Battery Cable Terminal Extension Procedure:: After the extension has been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling .
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.

Scheme 20

Scheme 20: Drive Motor Battery Cable Terminal Extension Cover Replacement
Scheme 20: Drive Motor Battery Cable Terminal Extension Cover Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the rear seat frame front finish cover. Refer to Rear Seat Frame Front Finish Cover Replacement (with HP2) . Tip seat up and remove the rear seat riser finish cover. Refer to Rear Seat Riser Finish Cover Replacement (with HP2) .
1Drive Motor Battery Cable Terminal Extension Cover Bolts (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten: 6 N.m (53 lb in)
2Drive Motor Battery Cable Terminal Extension Cover Procedure: After the cover has been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling .
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .

Scheme 21

Scheme 21: Drive Motor Battery High Voltage Manual Disconnect Knob Housing Replacement
Scheme 21: Drive Motor Battery High Voltage Manual Disconnect Knob Housing Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the upper cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement .
1Drive Motor Battery Positive, Negative, and Ground Shield Cable Terminal Fastener Nut (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten: 9 N.m (80 lb in)
2Drive Motor Battery 300 Volt Positive and Negative Cable WARNING: High Voltage (HV) cables are not repairable. After disconnecting HV cables, protect and insulate ring terminal ends immediately with the EL-48569 terminal covers and UL® Listed, or equivalent, insulation tape rated at a minimum of 600 volts. Damage caused to unprotected terminal ends will result in cable replacement. Tip: Remove the drive motor generator battery retaining nuts and bolt, raise and support the drive motor generator battery assembly on the right side approximately 76 mm (3 in). Special Tools: EL-48569 Terminal Covers. See Special Tools .
3Drive Motor Battery Cover Side Bolt (Qty: 4) Tighten: 6 N.m (53 lb in)
4Battery Cable Terminal Retainer
5Drive Motor Battery High Voltage Manual Disconnect Knob Housing
6Drive Motor Battery 300V Positive and Negative Cable Bolt (Qty: 2) Tighten: 6 N.m (53 lb in)
7Drive Motor Battery Positive and Negative w/Wiring Harness Cable Assembly WARNING: High Voltage (HV) cables are not repairable. After disconnecting HV cables, protect and insulate ring terminal ends immediately with the EL-48569 terminal covers and UL® Listed, or equivalent, insulation tape rated at a minimum of 600 volts. Damage caused to unprotected terminal ends will result in cable replacement. Special Tools: EL-48569 Terminal Covers. See Special Tools .
8HVIC Inline Connector
9Drive Motor Battery Cooling Air Outlet Duct Seal Procedure: After the duct seal has been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling .
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .
WARNING
High Voltage (HV) cables are not repairable. After disconnecting HV cables, protect and insulate ring terminal ends immediately with the EL-48569 terminal covers and UL® Listed, or equivalent, insulation tape rated at a minimum of 600 volts. Damage caused to unprotected terminal ends will result in cable replacement.
WARNING
High Voltage (HV) cables are not repairable. After disconnecting HV cables, protect and insulate ring terminal ends immediately with the EL-48569 terminal covers and UL® Listed, or equivalent, insulation tape rated at a minimum of 600 volts. Damage caused to unprotected terminal ends will result in cable replacement.

Scheme 22

Scheme 22: Drive Motor Battery Negative Relay Cable Replacement
Scheme 22: Drive Motor Battery Negative Relay Cable Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the upper cover and front cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement .
1Drive Motor Battery Cell Terminal Assembly Cover
2Drive Motor Battery Cooling Air Outlet Duct Seal
3Drive Motor Battery Cable Assembly Nut CAUTION: Refer to Fastener Caution . Tip: Always use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems. Tighten: 5 N.m (44 lb in)
4Drive Motor Battery Cable Terminal Nut Tip: Always use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems. Tighten: 5 N.m (44 lb in)
5Drive Motor Battery Negative Relay Cable Procedure:: After the cable has been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling .
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .

Scheme 23

Scheme 23: Drive Motor Battery Negative High Voltage Contactor Relay Replacement
Scheme 23: Drive Motor Battery Negative High Voltage Contactor Relay Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the upper cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement .
1Drive Motor Battery Cable Terminal Nut CAUTION: Refer to Fastener Caution . Tighten: 5 N.m (44 lb in)
2Drive Motor Battery Positive and Negative Cable with/Wiring Harness Assembly
3Drive Motor Battery Cable Terminal Nut Tighten: 5 N.m (44 lb in)
4Drive Motor Battery Negative Relay Cable Assembly WARNING: High Voltage (HV) cables are not repairable. After disconnecting HV cables, protect and insulate ring terminal ends immediately with the EL-48569 terminal covers and UL® Listed, or equivalent, insulation tape rated at a minimum of 600 volts. Damage caused to unprotected terminal ends will result in cable replacement. Special Tools: EL-48569 Terminal Covers. See Special Tools .
5Drive Motor Battery Housing Relay Nut (Qty: 2) Tighten: 3 N.m (27 lb in)
6Drive Motor Battery Negative High Voltage Contactor Relay Assembly
7Drive Motor Generator Battery Negative Relay Bracket Nut (Qty: 2) Tighten: 6 N.m (53 lb in)
8Drive Motor Battery Negative Relay Bracket Bolt Tighten: 6 N.m (53 lb in)
9Drive Motor Battery Negative Relay Bracket Procedure: After the negative contactor relay or bracket has been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling .
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .
WARNING
High Voltage (HV) cables are not repairable. After disconnecting HV cables, protect and insulate ring terminal ends immediately with the EL-48569 terminal covers and UL® Listed, or equivalent, insulation tape rated at a minimum of 600 volts. Damage caused to unprotected terminal ends will result in cable replacement.

Scheme 24

Scheme 24: Drive Motor Battery Positive Relay Cable Replacement
Scheme 24: Drive Motor Battery Positive Relay Cable Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the upper cover and right cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement .
1Drive Motor Battery Cell Terminal Assembly Cover
2Drive Motor Battery Cooling Air Outlet Duct Seal
3Drive Motor Battery Cable Terminal Nut CAUTION: Refer to Fastener Caution . Tip: Always use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems. Tighten: 5 N.m (44 lb in)
4Drive Motor Battery Cable Assembly Nut Tip: Always use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems. Tighten: 5 N.m (44 lb in)
5Drive Motor Battery Positive Relay Cable Assembly Procedure: After the cable assembly has been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling .
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .

Scheme 25

Scheme 25: Drive Motor Battery Current Sensor Replacement
Scheme 25: Drive Motor Battery Current Sensor Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the upper and right cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement . Remove the drive motor battery positive relay cable. Refer to Drive Motor Battery Positive Relay Cable Replacement .
1Drive Motor Battery Sensor Bracket Bolt (Qty: 2) Tighten: 5 N.m (44 lb in)
2Drive Motor Battery Current Sensor Bolt (Qty: 2) Tighten: 2 N.m (18 lb in)
3Drive Motor Battery Current Sensor Assembly Procedure Disconnect the electrical connector. After the current sensor assembly has been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling .
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.

Scheme 26

Scheme 26: Drive Motor Battery Positive High Voltage Contactor Relay Replacement
Scheme 26: Drive Motor Battery Positive High Voltage Contactor Relay Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the upper, front, and right side covers. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement .
1Drive Motor Battery Cable Terminal Nut (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: 5 N.m (44 lb in)
2Drive Motor Battery Positive Relay Cable Assembly WARNING: High Voltage (HV) cables are not repairable. After disconnecting HV cables, protect and insulate ring terminal ends immediately with the EL-48569 terminal covers and UL® Listed, or equivalent, insulation tape rated at a minimum of 600 volts. Damage caused to unprotected terminal ends will result in cable replacement. Tip: Remove the positive relay from the current sensor to ease removal of the relay. Special Tools: EL-48569 Terminal Covers. See Special Tools .
3Drive Motor Battery Positive and Negative w/Wiring Harness Cable Assembly WARNING: High Voltage (HV) cables are not repairable. After disconnecting HV cables, protect and insulate ring terminal ends immediately with the EL-48569 terminal covers and UL® Listed, or equivalent, insulation tape rated at a minimum of 600 volts. Damage caused to unprotected terminal ends will result in cable replacement. Special Tools: EL-48569 Terminal Covers. See Special Tools .
4Wiring Harness Connector
5Drive Motor Battery Positive High Voltage Contactor Relay Nut (Qty: 2) Tighten: 3 N.m (27 lb in)
6Drive Motor Battery Negative High Voltage Contactor Relay Assembly Procedure: After the relay assembly has been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling .
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .
WARNING
High Voltage (HV) cables are not repairable. After disconnecting HV cables, protect and insulate ring terminal ends immediately with the EL-48569 terminal covers and UL® Listed, or equivalent, insulation tape rated at a minimum of 600 volts. Damage caused to unprotected terminal ends will result in cable replacement.
WARNING
High Voltage (HV) cables are not repairable. After disconnecting HV cables, protect and insulate ring terminal ends immediately with the EL-48569 terminal covers and UL® Listed, or equivalent, insulation tape rated at a minimum of 600 volts. Damage caused to unprotected terminal ends will result in cable replacement.

Scheme 27

Scheme 27: Drive Motor Battery Inverter Current Limit Resistor Replacement
Scheme 27: Drive Motor Battery Inverter Current Limit Resistor Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the upper, front, and right side covers. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement .
1Drive Motor Battery Cable Terminal Nut CAUTION: Refer to Fastener Caution . Tighten: 5 N.m (44 lb in)
2Drive Motor Battery Positive Relay Cable Assembly WARNING: High Voltage (HV) cables are not repairable. After disconnecting HV cables, protect and insulate ring terminal ends immediately with the EL-48569 terminal covers and UL® Listed, or equivalent, insulation tape rated at a minimum of 600 volts. Damage caused to unprotected terminal ends will result in cable replacement. Special Tools: EL-48569 Terminal Covers. See Special Tools .
3Drive Motor Battery Current Limit Resistor Nut (Qty: 2) Tighten: 3 N.m (27 lb in)
4Wiring Harness Connector
5Drive Motor Battery Power Inverter Current Limit Resistor Assembly Procedure: After the resistor assembly has been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling .
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .
WARNING
High Voltage (HV) cables are not repairable. After disconnecting HV cables, protect and insulate ring terminal ends immediately with the EL-48569 terminal covers and UL® Listed, or equivalent, insulation tape rated at a minimum of 600 volts. Damage caused to unprotected terminal ends will result in cable replacement.

Scheme 28

Scheme 28: Drive Motor Power Inverter Current Limit Relay Replacement
Scheme 28: Drive Motor Power Inverter Current Limit Relay Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the upper, front, and right side covers. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement .
1Wiring Harness Connector (Qty: 4)
2Drive Motor Battery Positive Relay Nuts (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: 3 N.m (27 lb in)
3Drive Motor Battery Inverter Current Limit Relay Procedure: After the relay has been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling .
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .

Scheme 29

Scheme 29: Drive Motor Battery Positive and Negative Cable Replacement
Scheme 29: Drive Motor Battery Positive and Negative Cable Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the upper, front, and right cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement . Remove the drive motor battery high voltage manual disconnect knob housing. Refer to Drive Motor Battery High Voltage Manual Disconnect Knob Housing Replacement . Remove the battery cooling air outlet duct assembly. Refer to Drive Motor Battery Cooling Air Outlet Duct and Front Air Outlet Duct Replacement .
1Drive Motor Battery Cooling Air Outlet Duct Seal
2Drive Motor Battery Cable Terminal Nut CAUTION: Refer to Fastener Caution . Tighten: 5 N.m (44 lb in)
3Drive Motor Battery Cable Terminal Nut Tighten: 5 N.m (44 lb in)
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .

Scheme 30

Scheme 30: Battery Energy Control Module and Bracket Replacement
Scheme 30: Battery Energy Control Module and Bracket Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the upper cover, front cover and the right side cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement . Remove the drive motor battery current sensor. Refer to Drive Motor Battery Current Sensor Replacement .
1Drive Motor Generator Battery Positive Relay Insulator Nut (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten: 6 N.m (53 lb in)
2Drive Motor Battery Power Inverter Current Limit Relay Connector
3Drive Motor Battery Control Module Bracket Bolt (Qty: 2) Tighten: 5 N.m (44 lb in)
4Drive Motor Battery Control Module Lower Bracket
5Drive Motor Battery Control Module Upper Bracket Bolt (Qty: 2) Tighten: 5 N.m (44 lb in)
6Drive Motor Battery Control Module Upper Bracket
7Drive Motor Generator Battery Control Module Assembly Procedure Disconnect all connectors from the module. After the control module assembly has been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling .
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .

Scheme 31

Scheme 31: Drive Motor Battery Control Module Harness Replacement
Scheme 31: Drive Motor Battery Control Module Harness Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the upper cover, front cover, and right side cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement . Remove the drive motor battery positive and negative cable assembly. Refer to Drive Motor Battery Positive and Negative Cable Replacement .
1Drive Motor Battery Control Module Harness Ground Nut (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: 5 N.m (44 lb in)
2Battery Cable Clip
3Drive Motor Battery Control Module Harness Procedure: After the harness has been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling . Tip: If foam drive motor battery cooling air outlet duct seals are damaged during removal or installation of harness, NEW seals must be used.
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .

Scheme 32

Scheme 32: Drive Motor Battery Sensor Module Wiring Harness Replacement
Scheme 32: Drive Motor Battery Sensor Module Wiring Harness Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures: Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the upper cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement . Remove the battery cooling air outlet duct. Refer to Drive Motor Battery Cooling Air Outlet Duct and Front Air Outlet Duct Replacement . Remove the generator battery vent fan. Refer to Generator Battery Vent Fan Replacement .
1Drive Motor Battery Sensor Module Wiring Harness Assembly Procedure: Refer to Generator Battery Temperature Sensor Location for correct installation of harness temperature probes. After the wiring harness assembly has been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling .
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.

Scheme 33

Scheme 33: Battery Vent Tube Replacement
Scheme 33: Battery Vent Tube Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the upper cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement . Remove the battery cooling air outlet duct. Refer to Drive Motor Battery Cooling Air Outlet Duct and Front Air Outlet Duct Replacement .
1Battery Vent Tube
2Battery Vent Y Hose Retainer and Y Hose
3Battery Vent Tube Assembly
4Battery Vent Tube Upper Front Assembly
5Battery Vent Tube Upper Rear Assembly Procedure:: After the vent tube assemblies have been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling .
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.

Scheme 34

Scheme 34: Battery Terminal Cover Replacement
Scheme 34: Battery Terminal Cover Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedure: Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the upper cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement . Remove the disconnect knob housing. Refer to Drive Motor Battery High Voltage Manual Disconnect Knob Housing Replacement .
1Battery Terminal Cover
2Battery Terminal Cover
3Battery Terminal Cover
4Battery Terminal Cover
5Battery Terminal Cover Procedure:: After the battery terminal covers have been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling .
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.

Scheme 35

Scheme 35: Drive Motor Battery 300-Volt Positive and Negative Cable Replacement
Scheme 35: Drive Motor Battery 300-Volt Positive and Negative Cable Replacement
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures Disable the high voltage at both the drive motor generator battery assembly and the drive motor generator control module assembly. Refer to High Voltage Disabling . Remove the right front fender bracket. Refer to Front Fender Rear Upper Bracket Replacement . Remove the control module sight shield. Refer to Drive Motor Generator Control Module Sight Shield Replacement . Remove the right front wheelhouse liner. Refer to Front Wheelhouse Liner Replacement - Left Side . Remove the electric power steering control module. Refer to Electronic Power Steering Motor Control Module Replacement . Remove the rear muffler insulator and 2 catalytic converter bolts. Remove both resonator insulators. Refer to Exhaust Resonator Replacement (2-Mode) .
1Drive Motor Battery 300 Volt Negative Cable Terminal Fastener (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten: 9 N.m (80 lb in)
2Drive Motor Battery 300 Volt Positive and Negative Cable Procedure: Remove terminals from studs.
3300 Volt Positive and Negative Cable Front Elbow Hinge Panel (Qty: 3) Tip: Remove and replace plastic tie straps. Open all panels on cable front elbow.
4300V Positive and Negative Cable Retainer
5300V Positive and Negative Cable Front Elbow
6300V Positive and Negative Cable Nut (Qty: 5) Tighten: 10 N.m (89 lb in)
7Drive Motor Battery 300 Volt Cable Floor Grommet Nut (Qty: 2) Tighten: 9 N.m (80 lb in)
8Drive Motor Battery 300 Volt Positive and Negative Cable Procedure Push the drive motor battery 300 volt positive and negative cable through the floor grommet. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Pull cable rearward to remove cable from floor. Push cable forward of the rear cross member. Pull the cable out from under the rear cross member.
9Cable Gasket Procedure: After the cable has been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling . Tip: New gasket must be used.
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .

Scheme 36

Scheme 36: Drive Motor Generator Battery Replacement and Shipping Preparation
Scheme 36: Drive Motor Generator Battery Replacement and Shipping Preparation
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedure: Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling .
1Drive Motor Battery Positive, Negative, and Ground Shield Cable Terminal Fastener Nut (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten: 9 N.m (80 lb in)
2Drive Motor Battery 300 Volt Positive and Negative Cable WARNING: High Voltage (HV) cables are not repairable. After disconnecting HV cables, protect and insulate ring terminal ends immediately with the EL-48569 terminal covers and UL® Listed, or equivalent, insulation tape rated at a minimum of 600 volts. Damage caused to unprotected terminal ends will result in cable replacement. Special Tools: EL-48569 Terminal Covers. See Special Tools .
3Battery Vent Tube Tip: Remove the vent tube from the vehicle.
4Drive Motor Generator Battery Retainer Nut (Qty: 2) Tighten: 50 N.m (37 lb ft)
5Drive Motor Generator Battery Ground Nut Tighten: 25 N.m (18 lb ft)
6Drive Motor Generator Battery Mounting Nut Tighten: 25 N.m (18 lb ft)
7Drive Motor Generator Battery Ground Bolt Tighten: 25 N.m (18 lb ft)
8Drive Motor Battery Cable Terminal Extension Cover Procedure: Disconnect the X350 harness connector from the drive motor generator battery.
9Drive Motor Battery Cable Terminal Extension Cover Bolt (Qty: 4) Tighten: 6 N.m (53 lb in)
10Lifting Point - Right Side
11Lifting Points - Left Side
12Drive Motor Battery Assembly WARNING: The high voltage (HV) battery must be protected when outside of the vehicle. Storage Guidelines Store the HV battery flat, do not exceed 45 degrees when handling. Store the HV battery in an environmentally protected area. Maintain the HV battery at room temperature. Protect the HV battery from exposure to liquids. Protect the HV battery from physical damage. Unqualified Access Guidelines Cover all exposed high voltage openings with UL® listed, or equivalent, insulation tape rated at a minimum of 600 volts. Store the HV battery in a limited-access area. Failure to follow these guidelines may result in serious injury or death. Procedure After the battery assembly has been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling . Check for the latest software calibration updates. Refer to service programing system Service Programming System (SPS) Tip: Some portable lifting devices may require raising the vehicle or the removal of the rear tire to permit access of boom into the vehicle. If you are preparing the drive motor generator battery for shipment, install the terminal extension cover assembly and retaining bolts. Using UL® listed or equivalent insulation tape rated at a minimum of 600 V, tape over the manual disconnect opening and the high voltage cable openings on the terminal extension cover. Special Tools: EL-48265 Battery Lifting Fixture. See Special Tools .
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .
WARNING
High Voltage (HV) cables are not repairable. After disconnecting HV cables, protect and insulate ring terminal ends immediately with the EL-48569 terminal covers and UL® Listed, or equivalent, insulation tape rated at a minimum of 600 volts. Damage caused to unprotected terminal ends will result in cable replacement.
WARNING
The high voltage (HV) battery must be protected when outside of the vehicle. Storage Guidelines Store the HV battery flat, do not exceed 45 degrees when handling. Store the HV battery in an environmentally protected area. Maintain the HV battery at room temperature. Protect the HV battery from exposure to liquids. Protect the HV battery from physical damage. Unqualified Access Guidelines Cover all exposed high voltage openings with UL® listed, or equivalent, insulation tape rated at a minimum of 600 volts. Store the HV battery in a limited-access area. Failure to follow these guidelines may result in serious injury or death.

Scheme 37

Scheme 37: Case Covers
Scheme 37: Case Covers
CalloutComponent Name
WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedures Disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Remove the drive motor generator battery from the vehicle. Refer to Drive Motor Generator Battery Replacement and Shipping Preparation . Remove all components in this procedure from the disabled drive motor generator battery and install onto the new drive motor battery with case kit.
1Drive Motor Battery Cable Terminal Extension Cover Bolt (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten: 6 N.m (53 lb in)
2Drive Motor Battery Cable Terminal Extension Cover
3Drive Motor Battery Case Upper Cover Bolt (Qty: 21) Tighten: 8 N.m (71 lb in)
4Drive Motor Battery Case Upper Cover Nut (Qty: 6) Tighten: 8 N.m (71 lb in)
5Drive Motor Battery Case Upper Cover
6Drive Motor Battery Case Front Cover Bolt (Qty: 9) Tighten: 8 N.m (71 lb in)
7Drive Motor Battery Case Front Cover Push Rivet
8Drive Motor Battery Case Front Cover
9Drive Motor Battery Case Right Cover Nut Tighten: 8 N.m (71 lb in)
10Drive Motor Battery Case Right Cover Bolt (Qty: 3) Tighten: 8 N.m (71 lb in)
11Drive Motor Battery Case Right Cover
WARNING
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed. The High Voltage Disabling procedure will perform the following tasks: Identify how to disable high voltage. Identify how to test for the presence of high voltage. Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .

Case Covers

Scheme 38

Scheme 38: Battery Fan Assembly Components
Scheme 38: Battery Fan Assembly Components
CalloutComponent Name
1Battery Cooling Air Outlet Duct
2Drive Motor Battery Cable Terminal Nut CAUTION: Refer to Fastener Caution . Tip: Remove cable retainer from battery fan assembly. Tighten: 5 N.m (44 lb in)
3Battery Vent Fan Duct Retainer
4Drive Motor Generator Battery Cooling Outlet Duct
5Drive Motor Generator Battery Cooling Blower Nut (Qty: 2) Tighten: 6 N.m (53 lb in)
6Drive Motor Battery Cooling Blower Bolt Tighten: 6 N.m (53 lb in)
7Battery Fan Assembly
CAUTION
Refer to Fastener Caution .

Battery Fan Assembly Components

Scheme 39

Scheme 39: Drive Motor Battery Negative High Voltage Contactor Relay Assembly and Generator Battery Vent Fan Re
Scheme 39: Drive Motor Battery Negative High Voltage Contactor Relay Assembly and Generator Battery Vent Fan Re
CalloutComponent Name
1Drive Motor Battery Cable Terminal Nut (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: 5 N.m (44 lb in)
2Drive Motor Battery Positive and Negative w/Wiring Harness Cable Assembly WARNING: High Voltage (HV) cables are not repairable. After disconnecting HV cables, protect and insulate ring terminal ends immediately with the EL-48569 terminal covers and UL® Listed, or equivalent, insulation tape rated at a minimum of 600 volts. Damage caused to unprotected terminal ends will result in cable replacement. Special Tools: EL-48569 Terminal Covers. See Special Tools .
3Drive Motor Battery Housing Relay Nut (Qty: 2) Tighten: 3 N.m (27 lb in)
4Drive Motor Battery Negative High Voltage Contactor Relay Assembly
5Drive Motor Generator Battery Negative Relay Bracket Nut (Qty: 2) Tighten: 6 N.m (53 lb in)
6Drive Motor Battery Negative Relay Bracket Bolt Tighten: 6 N.m (53 lb in)
7Drive Motor Battery Negative Relay Bracket
8Generator Battery Vent Fan Relay
CAUTION
Refer to Fastener Caution .
WARNING
High Voltage (HV) cables are not repairable. After disconnecting HV cables, protect and insulate ring terminal ends immediately with the EL-48569 terminal covers and UL® Listed, or equivalent, insulation tape rated at a minimum of 600 volts. Damage caused to unprotected terminal ends will result in cable replacement.

Drive Motor Battery Negative High Voltage Contactor Relay Assembly and Generator Battery Vent Fan Relay

Scheme 40

Scheme 40: Drive Motor Generator Battery Control Module Assembly and Drive Motor Battery Current Sensor Assembl
Scheme 40: Drive Motor Generator Battery Control Module Assembly and Drive Motor Battery Current Sensor Assembl
CalloutComponent Name
1Drive Motor Battery Cable Terminal Nut CAUTION: Refer to Fastener Caution . Tighten: 5 N.m (44 lb in)
2Drive Motor Battery Cable Terminal Nut Tighten: 5 N.m (44 lb in)
3Drive Motor Battery Sensor Bracket Bolt (Qty: 2) Tighten: 5 N.m (44 lb in)
4Drive Motor Battery Current Sensor Assembly with Bracket
5Drive Motor Generator Battery Positive Relay Insulator Nut (Qty: 3) Tighten: 6 N.m (53 lb in)
6Drive Motor Generator Battery Control Module Assembly Procedure:: After the drive motor generator battery control module assembly has been replaced and the re-assembly of the drive motor generator battery, enable the HV system. Refer to High Voltage Enabling .
CAUTION
Refer to Fastener Caution .

Drive Motor Generator Battery Control Module Assembly and Drive Motor Battery Current Sensor Assembly

Drive Motor Battery High Voltage Contactor Relay Operation

The hybrid drive motor battery contains 3 relays that allow the high voltage (HV) DC batteries to be connected to the vehicle. The three HV relays are a positive HV contactor relay, negative HV contactor relay and current limit relay, also known as the precharge relay. These relays close and open in a certain sequence controlled by the battery energy control module (BECM). The control circuit for the HV relays use a common ground and the BECM provides a voltage signal to turn them on and off individually. During power up and power down the circuits are monitored by both the BECM and the hybrid powertrain control module (HPCM) located inside the power inverter module (PIM). The BECM measures this voltage on the terminal voltage sense wires. The HPCM monitors this voltage from the HV DC bus inside the drive motor generator control module.

To start the sequence of power up for the HV DC system the HPCM sends a contactor command signal to the BECM, the HV negative and HV precharge current limit relay turn on first. This allows the HV DC circuit to limit current through a precharge current limit resistor. The voltage then travels through the 300 volt DC cables up to the PIM. The BECM then closes the HV positive contactor relay after it measures voltage within 95 percent of the calculated pack voltage and then opens the precharge relay. The sequence times and voltage levels are monitored by both the BECM and HPCM. If the time limit or voltage value during a particular sequence is out of the specified range, the BECM and/or HPCM will set DTCs.

To disconnect the BECM will open both the HV positive and HV negative relays at the same time when the system conditions are ready. If a HV relay fails a system check during precharge or power down, the high voltage interlock circuit (HVIC) will not source HVIC current until the fault is repaired and the DTC is cleared by a scan tool.

Overview

The drive motor generator battery is also referred to as the hybrid battery. The drive motor generator battery contains 40 individual battery modules. Each battery module is rated at 7.2 volts direct current (DC) and all the modules are connected together in series. The combined output voltage of all the modules is about 288 volts DC. The DC high voltage (HV) connects to the drive motor/generator power inverter module (PIM) through HV DC cables that route underneath the vehicle. The HV battery positive and negative cable assembly (300v) is always colored orange to denote the potential for high voltage. The PIM converts the DC voltage to alternating current (AC) voltage to enable the electrical portion of the powertrain hybrid functions. The drive motor / generator battery has few moving parts. The moving parts are the 2 HV contactor relays, the HV current limit relay, the battery vent fan relay and a battery vent fan. The vent fan is used to help cool the batteries. The battery energy control module (BECM) controls these devices and monitors current, voltage and temperature by using several sensors within the hybrid battery assembly. The BECM will set diagnostic trouble codes based on these inputs.

Location

The hybrid drive motor/generator battery is located beneath the middle row seat on sport utility models and beneath the rear seat on crew cab pickup truck models. The BECM, vent fan, vent fan relay, current limit relay, and HV contactor relays are located within the hybrid battery assembly.

State of Charge

The battery energy control module (BECM) uses a complex calculation method based on varying conditions over a range of operation to determine and update the state of charge (SOC) of the hybrid battery. The hybrid battery parameters used by the BECM include current, voltage, and temperature. These inputs are monitored by several sensors within the hybrid battery assembly.

Operating Functions

The battery energy control module (BECM) is also referred to as the drive motor generator battery control module. In order to maintain proper state of charge levels and operate efficiently, the hybrid drive motor generator battery has several systems that need to be monitored and controlled. These systems include hybrid battery voltage measurement, hybrid battery current measurement, hybrid battery cooling and the high voltage interlock loop system. Additionally, the BECM operates the high voltage contactor relays at the request of the hybrid powertrain control module (HPCM). The BECM is located within the hybrid battery assembly.

Communication and Hosted Diagnostics

The HPCM is the host controller for diagnostic trouble code (DTC) information for the following control modules

  1. Accessory DC power converter module (APM)
  2. Battery energy control module (BECM)
  3. Motor control module (MCM) 1
  4. Motor control module (MCM) 2
  5. Auxiliary transmission fluid pump (ATFP) control module

The BECM will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the BECM to the HPCM through the Hybrid LAN communication circuit.

In the event a hosted module communicates a fault condition, the HPCM will determine if hybrid operation is affected and notify the vehicle operator by requesting the MIL illuminate and/or by displaying a hybrid service required message. In addition, the HPCM will store the associated DTC information for retrieval by a scan tool. Some hosted modules may require an ignition cycle to clear certain DTCs from the HPCM.

Input Circuits - Voltage Measurement

The BECM monitors the voltage values of the hybrid batteries using two different methods. The BECM monitors the sum of the voltage at 20 battery locations, and sums up these values to generate a calculated voltage value. The BECM also measures high voltage when the contactors are closed by monitoring the total bus voltage from the harness on the output side of the high voltage positive and negative contactor relays, this is the terminal voltage measurement.

Input Circuits - Hybrid Battery Current Measurement

The BECM monitors current through the hybrid battery current sensor. The hybrid battery current sensor is mounted on the positive cable side internal to the hybrid drive motor generator battery assembly. The current sensor detects the amperage that flows in and out of the hybrid batteries. The current sensor inputs a voltage between 0-5 volts in proportion to the amperage. A reading of 2.5 volts is 0 amps.

Input Circuits - Hybrid Battery Temperature

The hybrid drive motor battery is an air cooled component. The hybrid drive motor battery vent fan and relay are located inside the hybrid drive motor battery assembly and controlled by the BECM. The BECM monitors four hybrid battery temperature sensors, one air inlet temperature sensor, and one air outlet temperature sensor. These six temperature sensors are internal to the hybrid drive motor generator battery assembly. The four hybrid battery temperature sensors are located on the top of the hybrid batteries. The resistances of these temperature sensors increase with temperature. The BECM can adjust the vent fan speed based on vehicle speed and temperature.

Input Circuits - High Voltage Interlock Circuit (HVIC)

The vehicle is equipped with a high voltage interlock circuit (HVIC) feature. The purpose of the HVIC is to detect attempted access to HV components when HV is present. The BECM sources and monitors current on a 2 wire circuit that runs through certain HV components and their access points. The BECM will take action based on the results of the measured current at both the input and output circuits. Additionally, the drive motor generator PIM monitors the HVIC and will also take action based upon the measured current. Refer to High Voltage Monitoring Systems Description .

Output Circuits - High Voltage Contactor Relays

There are three high voltage contactor relays, the positive main HV contactor relay, the negative main HV contactor relay and the current limit relay, also called the precharge relay. The HV contactor relays, sometimes called contactors, open the high voltage battery negative and positive circuits and isolate the hybrid battery voltage from the rest of the vehicle. The BECM will close the HV contactor relays only at the request of the HPCM. Either the BECM or the HPCM can command that the HV contactor relays be opened in the event a system fault is detected. The contactors must be opened and closed under tightly controlled conditions in order to prevent damage to either the PIM or the HV contactor relays themselves.

In order to prevent damage to the PIM capacitors, the HV contactor relays are always closed in the following sequence

  1. The negative main HV contactor relay is closed.
  2. The current limit relay is closed. The precharge high voltage circuit contains an in-line current limit resistor. With both the negative main HV contactor relay and the current limit relay closed, the high voltage is slowly brought to operating voltage. Slowly bringing the high voltage to operating level prevents surge damage of the PIM capacitors.
  3. Once the BECM reads 95 percent of available buss voltage at the HV terminals, the BECM will close the HV positive contactor relay.
  4. The positive main HV contactor relay is closed. The positive main HV contactor relay bypasses the current limit relay and resistor in the precharge circuit and allows high current flow in and out of the hybrid batteries to occur.
  5. The current limit relay is opened once the system is at operating voltage.

In order to prevent damage to the HV relays, current flow through the relay switch contacts must be minimized prior to any attempt at opening them. The HPCM must ensure the system is in a low current flow condition prior to allowing the BECM to open the HV contactor relays. The HPCM will command that all high voltage components like the APM and the air conditioning compressor stop drawing current. Also, the HPCM will ensure that the motor/generators have stopped rotating and that they are neither consuming nor generating electrical current.

Output Circuits - Hybrid Drive Motor Battery Vent Fan

The hybrid drive motor battery is an air cooled component. The hybrid drive motor battery vent fan and relay are located inside the hybrid drive motor battery assembly and controlled by the BECM. The BECM monitors hybrid battery temperature air inlet and air outlet temperatures. The BECM can adjust the vent fan speed based on vehicle speed and temperature. The BECM grounds the primary side of the vent fan relay to supply voltage to the vent fan. The BECM controls the vent fan speed through a separate wire with a pulse width modulated signal (PWM). The vent fan assembly internal circuitry converts the PWM signal into fan speed.

Drive Motor Generator Battery Venting System

The hybrid drive motor generator battery contains 40 individual batteries. The hybrid drive motor generator battery has two venting systems. One is for battery air cooling. The other is for venting of possible electrolyte gases from the 40 hybrid batteries. The hybrid batteries vent system connects all the battery vents to a rubber manifold that exits at the rear of the hybrid drive motor generator battery through a single hose and is vented through the floor panel of the vehicle.

Each of the 40 hybrid batteries has a vent for electrolyte gas that is located on the top of each battery. The hybrid batteries vent system connects all of the 40 hybrid battery vents to a rubber manifold. The vent exits the hybrid drive motor generator battery through a single hose in the rear and is vented through the floor panel of the vehicle. These vents are mechanical and will only open when a predetermined amount of internal battery pressure is reached.

Drive Motor Generator Battery Control Module Power Limit Capability

The battery energy control module (BECM) communicates the amount of power available from the drive motor generator battery for use by the hybrid system and also the amount of charge power allowed back to the drive motor generator battery from the hybrid system. This information is sent over on the GMLAN communications network to the hybrid powertrain control module (HPCM).

The BECM can adjust these power limits either based on hybrid battery temperature, hybrid battery voltage or DTC information.

The HPCM compares the BECM power limit capability to a similar value calculated in the HPCM and uses the lower of the 2 values to control the power.

Under normal operation the BECM will communicate both the available charge power and available discharge power limits according to the following power limit table based upon the maximum hybrid battery temperature.

Battery Temperature °C (°F)Drive Motor Generator Battery Power Limit Capability
Available Discharge Power Limit in WattsAvailable Charge Power Limit in Watts
Less than or equal to -40°C (-40°F)3000 23000 2
30°C (-22°F)50005000
25°C (-13°F)50005000
20°C (-4°F)60006000
10°C (14°F)80008000
0°C (32°F)1300013000
18°C (64°F) 125000 122000 1
22°C (72°F) 130000 132000 1
42°C (108°F) 130000 132000 1
46°C (115°F)1600016000
48°C (118°F)1000010000
50°C (122°F)60005500
52°C (126°F)45004500
56°C (133°F)3000 23000 2
60°C (140°F)3000 23000 2
70°C (158°F)3000 23000 2
1 Optimal Hybrid Performance 2 Minimal Hybrid Functions

Drive Motor Generator Battery Power Limit Table

A severely depleted hybrid drive motor battery may not have sufficient energy needed to crank/start the engine. In this case a scan tool may be used to place the accessory power module (APM) in a special operating mode called Jump Assist. The Jump Assist function allows on vehicle charging of the hybrid drive motor batteries using the 12 volt DC vehicle system.

In Jump Assist the APM converts the 12 volt DC to high voltage (HV) DC. The high voltage DC can then charge the hybrid drive motor batteries. During this mode of operation the APM and vehicle systems may draw up to 80 amps of current from the vehicles 12 volt DC system. An external 12 volt DC battery charger is required during the Jump Assist mode. In order to guarantee a successful engine start, approximately 20 percent state of charge (SOC) in the hybrid drive motor battery is recommended. Refer to Jump Assist . A successful Jump Assist can be expected to take an extended period of time not less than 20 minutes.

The APM hardware requires a minimum voltage level on the hybrid drive motor battery in order to initiate the Jump Assist function. If there is less than this required voltage level, the hybrid drive motor battery assembly must be replaced.

Scheme 41

Scheme 41: Drive Motor Generator Battery Identification Information
Scheme 41: Drive Motor Generator Battery Identification Information
CalloutComponent Name
1Quantity of Modules: 40 Batteries = L
2Date of Production: 2nd day = 02
3Month of Production: 1,2,3....9, X(10), Y(11), Z(12)
4Year of Production: 2008 = L, 2007 = K
5Production Shift: A, B
6Vehicle Type: T921 = N, T921 Service Parts = O, T901 = P, T901 Service Parts = Q
7Serial Number (Sequence Number)
8Record of Minor Changes

Special Tools

Illustration Tool Number/ Description EL-48265 Battery Pack Lifting Adapter EL-48458 Pre-Charge Tester EL-48569 Terminal Covers EL-48571 High Voltage Battery Pin Out Box EL-48900 HEV Safety Kit

Scheme 42

Scheme 42: Special Tools
Scheme 42: Special Tools

Scheme 43

Scheme 43
Scheme 43

See also:
• Rear Seat Frame Front Finish Cover Replacement (with HP2)
• Battery Negative Cable Disconnection and Connection
• Drive Motor Generator Control Module Sight Shield Replacement
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Component Connector End Views
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Hybrid Controls Schematics
• Diagnostic Trouble Code (DTC) List - Vehicle
• DTC P1AE2-P1AE4, P1B05, or P1B06
• High Voltage System Diagnosis (EL-48458)
• Air Conditioning Compressor Replacement (HP2)
• Charging System Test
• DTC P2534
• Drive Motor Generator Battery Cooling Description
• Checking Aftermarket Accessories
• Generator Battery Vent Fan Replacement
• Fastener Caution
• Generator Battery Temperature Sensor Location
• Front Fender Rear Upper Bracket Replacement
• Front Wheelhouse Liner Replacement - Left Side
• Electronic Power Steering Motor Control Module Replacement
• Exhaust Resonator Replacement (2-Mode)
• Lifting and Jacking the Vehicle
• Service Programming System (SPS)
• High Voltage Monitoring Systems Description
• DTC P0A1F, P1A01, P1A05, or P1A06
• Special Tools
• High Voltage Safety
• Drive Motor Generator Battery End of Life Resistance
• High Voltage Disabling
• Drive Motor Battery High Voltage Contactor Relay Operation
• High Voltage Enabling

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