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Hybrid/ev Energy Storage System Buick Regal V

Body Electrical 7 illustrations ~28142 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Battery Auxiliary Tray Fasteners22 N.m16 lb ft
Battery Energy Control Module Fasteners9 N.m80 lb in
Battery Energy Control Module Wiring Junction Block Fasteners9 N.m80 lb in
BDU Housing Fasteners6 N.m53 lb in
Cut-Off Switch Screw4 N.m35 lb in
Disconnect High Voltage Switch Mounting Fastener9 N.m80 lb in
Drive Motor Generator Battery Cable Bracket Fasteners22 N.m16 lb ft
Drive Motor Generator Battery Cable Tray Fasteners22 N.m16 lb ft
Drive Motor Generator Battery Cable U V W Terminal Fasteners9 N.m80 lb in
Generator Battery Disconnect Relay Fasteners9 N.m80 lb in
Generator Battery Fasteners22 N.m16 lb ft
Generator Battery Fuse Fasteners9 N.m80 lb in
Generator Control and Battery Module Mounting Fasteners22 N.m16 lb ft
Generator Control Module Cable Cover Fasteners9 N.m80 lb in
Generator Control Module Cover Fasteners9 N.m80 lb in
Generator Control Module Fasteners9 N.m80 lb in
High Voltage Cables-to-Battery Block Fasteners9 N.m80 lb in
HVIL Connector4 N.m35 lb in
Intermediate Duct to Power Pack Tray9 N.m80 lb in
Outlet Duct Adapter Fasteners6 N.m53 lb in

Fastener Tightening Specifications

Scheme 251

Scheme 251: Power, Ground, and Serial Data Wiring Schematics
Scheme 251: Power, Ground, and Serial Data Wiring Schematics

Scheme 252

Scheme 252: Contactors Wiring Schematics
Scheme 252: Contactors Wiring Schematics

Scheme 253

Scheme 253: Hybrid Battery Pack Monitoring Wiring Schematics
Scheme 253: Hybrid Battery Pack Monitoring Wiring Schematics

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGHigh voltage circuits should only be tested using a digital multimeter (DMM) and test leads with at least a CAT III rating, such as the J 39200-A Digital Multimeter. Failure to follow the procedures 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

EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

Precautions when Performing Service or Inspections

  1. Always verify that the high voltage has been disabled before working on or around high voltage components, wires, cables, or harnesses.
  2. Remove all metal objects such as rings and watches.
  3. The EL-48900 HEV safety kit contains safety cones. Place the safety cones around the vehicle to alert other technicians that you are working on the high voltage system.
  4. Remove all vehicle keys and secure in a location outside the vehicle. If the vehicle is equipped with push button start, the keys must remain at least 3 meters (15 feet) from the vehicle.
  5. Ensure that the manual service disconnect lever is secured in the open position with a zip tie.
  6. Always wear certified and tested high voltage insulation gloves when inspecting or testing any high voltage wires and components.
  7. Use the "One Hand" rule: Work with only one hand whenever possible. Keep the other hand behind your back.
  8. DO NOT carry any metal objects such as a mechanical pencil or a measuring tape that could fall and cause a short circuit.
  9. After removing any high voltage wires, protect and insulate the terminal ends immediately with UL® Listed or equivalent insulation tape rated at a minimum of 600 V.
  10. Always tighten the high voltage terminal fasteners to the specified torque. Insufficient or excessive torque will cause malfunctions or damage.
  11. After finishing work on the high voltage systems and before closing the manual service 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.

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, the high voltage energy storage device (battery) is affixed with a RED DANGER label and other high voltage components (e.g. starter/generator) are affixed with ORANGE WARNING labels.

Scheme 254

Scheme 254: High Voltage Insulation Glove Inspection Procedure
Scheme 254: 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 V.

  1. Remove glove from leather protector.
  2. Inflate glove and seal opening. Pinch the opening closed tightly to prevent any air loss.
  3. Press glove to increase pressure.
  4. Inspect for any of 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 exist, 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.
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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.

Servicing the A4 Hybrid/EV Battery Pack, A15 Starter/Generator, High Voltage 3-Phase Cables, and General Vehicle Servicing

This disabling procedure should only be used when service is being performed on components that are located outside of the A4 hybrid/EV battery pack, such as the A15 starter/generator and high voltage 3-phase cables, or when the A4 hybrid/EV battery pack is being replaced as a complete assembly. This procedure will only verify that high voltage has been removed from locations outside the A4 hybrid/EV battery pack. If testing or replacement requires disassembling the A4 hybrid/EV battery pack and accessing any components within, Servicing Any Internal Components Within the A4 Hybrid/EV Battery Pack, located below, must be used. The Servicing Any Internal Components Within the A4 Hybrid/EV Battery Pack procedure must be used because of the constant presence of high voltage when the A4 hybrid/EV battery pack is disassembled.

  1. Review the high voltage safety information. Refer to «High Voltage Safety»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-safety) .
  2. Disconnect and remove any 12 V battery chargers.
  3. Turn the ignition OFF and wait 5 minutes to allow the high voltage capacitors to discharge.
  4. Remove all vehicle keys and secure in a location outside the vehicle. If the vehicle is equipped with push button start, the keys must remain at least 3 meters (10 feet) away from the vehicle.
  5. Disconnect the 12 V battery. Refer to «Battery Negative Cable Disconnection and Connection»(/buick/regal/v-2009-2013/remont/charging-system/#battery-charging-system-and-starting-system-non-hybrid) .
  6. Lower the rear seatback and reposition the trunk liner to gain access to the A4 hybrid/EV battery pack.
  7. Disengage the blue connector position assurance (1) from the high voltage interlock switch by pulling the CPA straight out. Do not fully remove the CPA from the switch or damage to the CPA will result.
  8. Depress the white tab on the high voltage interlock switch and slide the interlock switch toward the left side of the vehicle (2).
  9. Flip the S15 hybrid/EV battery pack high voltage manual disconnect lever, located on the A4 hybrid/EV battery pack, toward the right side of the vehicle and secure in the open position with a zip tie (3).
  10. Remove the F102 hybrid/EV battery pack cable cover from the A4 hybrid/EV battery pack.
  11. Test the DMM by measuring a 12 V battery. The reading on the DMM should accurately reflect the battery voltage. If the DMM does not properly measure a 12 V battery Repair or replace the DMM. If the DMM properly measures a 12 V battery
  12. Verify that the voltage has been disabled at the energy storage system. Using the DMM on the DC voltage scale, test for less than 3 V at the following points: High voltage 3-Phase terminal V to vehicle chassis ground High voltage 3-Phase terminal W to vehicle chassis ground High voltage 3-Phase terminal U to vehicle chassis ground High voltage 3-Phase terminal U to High voltage 3-Phase terminal V High voltage 3-Phase terminal V to High voltage 3-Phase terminal W High voltage 3-Phase terminal W to High voltage 3-Phase terminal U If 3 V or greater A contactor is stuck closed or a loss of isolation has occurred within the A4 hybrid/EV battery pack. Refer to «Hybrid\EV Battery Voltage Present»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) . If less than 3 V
  13. Test the DMM by measuring a 12 V battery. The reading on the DMM should accurately reflect the battery voltage. If the DMM does not properly measure a 12 V battery Repair or replace the DMM and perform step 11 again. If the DMM properly measures a 12 V battery
  14. If all the test results were less than 3 V, the A4 hybrid/EV battery pack, A15 starter/generator, high voltage 3-phase cables, or general vehicle can now be serviced.

Servicing Any Internal Components Within the A4 Hybrid/EV Battery Pack

This disabling procedure should be used when any service is being performed on components that are internal to the A4 hybrid/EV battery pack, such as the K59 starter/generator control module and K16 battery energy control module. If a diagnostic instructs to perform any testing or replacement of components within the A4 hybrid/EV battery pack, this procedure must be used. This procedure will completely disconnect and isolate the C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2 from the vehicle, allowing testing or replacement to occur in a safer environment.

  1. Review the high voltage safety information. Refer to «High Voltage Safety»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-safety) .
  2. Disconnect and remove any 12 V battery chargers.
  3. Turn the ignition OFF and wait 5 minutes to allow the high voltage capacitors to discharge.
  4. Remove all vehicle keys and secure in a location outside the vehicle. If the vehicle is equipped with push button start, the keys must remain at least 3 meters (10 feet) away from the vehicle.
  5. Disconnect the 12 V battery. Refer to «Battery Negative Cable Disconnection and Connection»(/buick/regal/v-2009-2013/remont/charging-system/#battery-charging-system-and-starting-system-non-hybrid) .
  6. Lower the rear seatback and reposition the trunk liner to gain access to the A4 hybrid/EV battery pack.
  7. Disengage the blue connector position assurance (1) from the high voltage interlock switch by pulling the CPA straight out. Do not fully remove the CPA from the switch or damage to the CPA will result.
  8. Depress the white tab on the high voltage interlock switch and slide the interlock switch (2) toward the left side of the vehicle.
  9. Flip the S15 hybrid/EV battery pack high voltage manual disconnect lever, located on the A4 hybrid/EV battery pack, toward the right side of the vehicle and secure in the open position with a zip tie (3).
  10. Remove the F102 hybrid/EV battery pack cable cover from the A4 hybrid/EV battery pack.
  11. Test the DMM by measuring a 12 V battery. The reading on the DMM should accurately reflect the battery voltage. If the DMM does not properly measure a 12 V battery Repair or replace the DMM. If the DMM properly measures a 12 V battery
  12. Verify that the voltage has been disabled at the energy storage system. Using the DMM on the DC voltage scale, test for less than 3 V at the following points: High voltage 3-Phase terminal V to vehicle chassis ground High voltage 3-Phase terminal W to vehicle chassis ground High voltage 3-Phase terminal U to vehicle chassis ground High voltage 3-Phase terminal U to High voltage 3-Phase terminal V High voltage 3-Phase terminal V to High voltage 3-Phase terminal W High voltage 3-Phase terminal W to High voltage 3-Phase terminal U If 3 V or greater A contactor is stuck closed or a loss of isolation has occurred within the A4 hybrid/EV battery pack. Refer to «Hybrid\EV Battery Voltage Present»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) . If less than 3 V
  13. Test the DMM by measuring a 12 V battery. The reading on the DMM should accurately reflect the battery voltage. If the DMM does not properly measure a 12 V battery Repair or replace the DMM and perform step 11 again. If the DMM properly measures a 12 V battery
  14. Remove the A4 hybrid/EV battery pack cover. Refer to «Generator Control Module Cover Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) .
  15. Verify that the S15 hybrid/EV battery pack high voltage manual disconnect lever is functioning properly. Using the DMM on the DC voltage scale, test for less than 3 V between the High Voltage DC terminal (1) and the High Voltage DC terminal (2). If 3 V or greater The S15 hybrid/EV battery pack high voltage manual disconnect lever is stuck closed. Replace the S15 hybrid/EV battery pack high voltage manual disconnect lever immediately after completing this disabling procedure. If less than 3 V
  16. Flip open the orange battery terminal covers at the C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2.
  17. Disconnect the battery terminals at the C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2 in the order specified in the above graphic.
  18. Remove the high voltage cables from the battery terminals and close the battery terminal covers, with the cables on the outside of the closed terminal covers.
  19. Tape the battery terminal covers closed with UL® listed, or equivalent, insulation tape rated at a minimum of 600 V.
  20. Test the DMM by measuring a 12 V battery. The reading on the DMM should accurately reflect the battery voltage. If the DMM does not properly measure a 12 V battery Repair or replace the DMM and perform the disabling procedure again. If the DMM properly measures a 12 V battery
  21. Test for less than 1 ohms across the 125 A fuse located in the S15 hybrid/EV battery pack high voltage manual disconnect lever. If 1 ohms or greater The 125 A fuse is open. If the fuse is open, verify the S15 hybrid/EV battery pack high voltage manual disconnect lever is also open by testing for infinite resistance across the switch terminals. Replace the fuse after high voltage testing is complete and a system repair has been made. Torque fasteners to 9 N.m (80 lb in). If less than 1 ohms
  22. With the high voltage cables disconnected and the battery terminal covers secured, the K59 starter/generator control module, K16 battery energy control module, S15 hybrid/EV battery pack high voltage manual disconnect lever, KR38 main contactor, R25 hybrid/EV battery pre-charge resistor, KR134 pre-charge contactor, B30 hybrid/EV battery pack current sensor, C4A hybrid/EV battery section 1, C4B hybrid/EV battery section 2, and any components within the A4 hybrid/EV battery pack can now be serviced.

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.
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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures 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. Verify that the 12 V battery is disconnected. If the 12 V battery is connected Disconnect the 12 V battery. Refer to «Battery Negative Cable Disconnection and Connection»(/buick/regal/v-2009-2013/remont/charging-system/#battery-charging-system-and-starting-system-non-hybrid) . If the 12 V battery is disconnected
  2. After completing testing or any repairs on the high voltage systems and before closing the S15 hybrid/EV battery pack high voltage manual disconnect lever, inspect for the following: Verify that all tools and loose components have been removed from the A4 hybrid/EV battery pack area and all items are accounted for. Verify high voltage system integrity and that all connectors are installed. Install any components or connectors that have been removed or replaced during diagnosis.
  3. If the battery terminals at the C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2 have been removed, reconnect the high voltage battery cables in the order shown above and close the battery terminal covers. Torque fasteners to 9 N.m (80 lb in).
  4. If the A4 hybrid/EV battery pack cover has been removed, reinstall the cover. Refer to «Generator Control Module Cover Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) .
  5. Connect the U, V, and W 3-phase cables. Torque fasteners to 9 N.m (80 lb in).
  6. Connect the 12 V battery cable at the K59 starter/generator control module. Torque fastener to 9 N.m (80 lb in).
  7. Install the F102 hybrid/EV battery pack cable cover. Torque fastener to 9 N.m (80 lb in).
  8. Push in the red safety plunger and flip the S15 hybrid/EV battery pack high voltage manual disconnect lever (1) to the closed position.
  9. Slide the white interconnect switch (2) to the closed position and push in the blue CPA (3).
  10. Connect the 12 V battery. Refer to «Battery Negative Cable Disconnection and Connection»(/buick/regal/v-2009-2013/remont/charging-system/#battery-charging-system-and-starting-system-non-hybrid) .
  11. Start the engine, then turn the ignition OFF.
  12. Ignition ON, clear all DTC Information with a scan tool.
  13. Ignition OFF, wait 2 minutes, I\ignition ON.
  14. Verify no DTCs are set. If any DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If no DTCs are set
  15. Start and idle the engine for 2 minutes.
  16. Ignition OFF, wait 5 minutes, ignition ON.
  17. Verify that the following DTCs have Ran Since Code Clear and have not set: Contactor DTCs P0ADB, P0ADC, P0AE6, or P0AE7 Discharge and Pre-charge DTCs P0C77 or P0AFB. High voltage loss of isolation DTCs P0AA6 or P1AF0 If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If any of the DTCs have not Ran Since Code Clear Review and operate the vehicle according to the DTC Conditions for Running and ensure the DTCs run and pass. If all the DTCs have Ran Since Code Clear and are not set
  18. All OK.

Diagnostic Code Index

DTCDescription
DTC P0641DTC P0641 5V Reference 1 Circuit
DTC P0651, P0A0C, or P0A0DDTC P0651 5V Reference 2 Circuit DTC P0A0C High Voltage System Interlock Circuit 1 Low Voltage DTC P0A0D High Voltage System Interlock Circuit 1 High Voltage
DTC P0A80DTC P0A80 Replace Hybrid Battery Pack
DTC P0AA8-P0AAADTC P0AA8 Hybrid Battery Voltage Isolation Sensing Performance DTC P0AA9 Hybrid Battery Voltage Isolation Sensing Circuit 1 Low Voltage DTC P0AAA Hybrid Battery Voltage Isolation Sensing Circuit 1 High Voltage
DTC P0ABB, P0ABC, or P0ABDDTC P0ABB Hybrid Battery Voltage Sensor Performance DTC P0ABC Hybrid Battery Voltage Sensor Circuit Low Voltage DTC P0ABD Hybrid Battery Voltage Sensor Circuit High Voltage
DTC P0AC1, P0AC2, P1A07, or P1EBADTC P0AC1 Hybrid Battery Current Sensor Circuit Low Voltage DTC P0AC2 Hybrid Battery Current Sensor Circuit High Voltage DTC P1A07 Battery Energy Control Module 5 Volt Reference Circuit DTC P1EBA Hybrid Battery Current Sensor Performance
DTC P0ADB or P0ADCDTC P0ADB Hybrid Battery Positive Contactor Control Circuit Low Voltage DTC P0ADC Hybrid Battery Positive Contactor Control Circuit High Voltage
DTC P0AE6 or P0AE7DTC P0AE6 Hybrid Battery Precharge Contactor Control Circuit Low Voltage DTC P0AE7 Hybrid Battery Precharge Contactor Control Circuit High Voltage
DTC P0AF8DTC P0AF8 Hybrid Battery System Voltage
DTC P0AFA or P0AFBDTC P0AFA Hybrid Battery System Voltage Low DTC P0AFB Hybrid Battery System Voltage High
DTC P0B3B-P0BBB, P1B16-P1B2D, P1B3D, or P1B3EDTC P0B3B Hybrid/EV Battery 1 Circuit DTC P0B3C Hybrid/EV Battery 1 Circuit Performance DTC P0B3D Hybrid/EV Battery 1 Circuit Low Voltage DTC P0B3E Hybrid/EV Battery 1 Circuit High Voltage DTC P0B40 Hybrid/EV Battery 2 Circuit DTC P0B41 Hybrid/EV Battery 2 Circuit Performance DTC P0B42 Hybrid/EV Battery 2 Circuit Low Voltage DTC P0B43 Hybrid/EV Battery 2 Circuit High Voltage DTC P0B45 Hybrid/EV Battery 3 Circuit DTC P0B46 Hybrid/EV Battery 3 Circuit Performance DTC P0B47 Hybrid/EV Battery 3 Circuit Low Voltage DTC P0B48 Hybrid/EV Battery 3 Circuit High Voltage DTC P0B4A Hybrid/EV Battery 4 Circuit DTC P0B4B Hybrid/EV Battery 4 Circuit Performance DTC P0B4C Hybrid/EV Battery 4 Circuit Low Voltage DTC P0B4D Hybrid/EV Battery 4 Circuit High Voltage DTC P0B4F Hybrid/EV Battery 5 Circuit DTC P0B50 Hybrid/EV Battery 5 Circuit Performance DTC P0B51 Hybrid/EV Battery 5 Circuit Low Voltage DTC P0B52 Hybrid/EV Battery 5 Circuit High Voltage DTC P0B54 Hybrid/EV Battery 6 Circuit DTC P0B55 Hybrid/EV Battery 6 Circuit Performance DTC P0B56 Hybrid/EV Battery 6 Circuit Low Voltage DTC P0B57 Hybrid/EV Battery 6 Circuit High Voltage DTC P0B59 Hybrid/EV Battery 7 Circuit DTC P0B5A Hybrid/EV Battery 7 Circuit Performance DTC P0B5B Hybrid/EV Battery 7 Circuit Low Voltage DTC P0B5C Hybrid/EV Battery 7 Circuit High Voltage DTC P0B5E Hybrid/EV Battery 8 Circuit DTC P0B5F Hybrid/EV Battery 8 Circuit Performance DTC P0B60 Hybrid/EV Battery 8 Circuit Low Voltage DTC P0B61 Hybrid/EV Battery 8 Circuit High Voltage DTC P0B63 Hybrid/EV Battery 9 Circuit DTC P0B64 Hybrid/EV Battery 9 Circuit Performance DTC P0B65 Hybrid/EV Battery 9 Circuit Low Voltage DTC P0B66 Hybrid/EV Battery 9 Circuit High Voltage DTC P0B68 Hybrid/EV Battery 10 Circuit DTC P0B69 Hybrid/EV Battery 10 Circuit Performance DTC P0B6A Hybrid/EV Battery 10 Circuit Low Voltage DTC P0B6B Hybrid/EV Battery 10 Circuit High Voltage DTC P0B6D Hybrid/EV Battery 11 Circuit DTC P0B6E Hybrid/EV Battery 11 Circuit Performance DTC P0B6F Hybrid/EV Battery 11 Circuit Low Voltage DTC P0B70 Hybrid/EV Battery 11 Circuit High Voltage DTC P0B72 Hybrid/EV Battery 12 Circuit DTC P0B73 Hybrid/EV Battery 12 Circuit Performance DTC P0B74 Hybrid/EV Battery 12 Circuit Low Voltage DTC P0B75 Hybrid/EV Battery 12 Circuit High Voltage DTC P0B77 Hybrid/EV Battery 13 Circuit DTC P0B78 Hybrid/EV Battery 13 Circuit Performance DTC P0B79 Hybrid/EV Battery 13 Circuit Low Voltage DTC P0B7A Hybrid/EV Battery 13 Circuit High Voltage DTC P0B7C Hybrid/EV Battery 14 Circuit DTC P0B7D Hybrid/EV Battery 14 Circuit Performance DTC P0B7E Hybrid/EV Battery 14 Circuit Low Voltage DTC P0B7F Hybrid/EV Battery 14 Circuit High Voltage DTC P0B81 Hybrid/EV Battery 15 Circuit DTC P0B82 Hybrid/EV Battery 15 Circuit Performance DTC P0B83 Hybrid/EV Battery 15 Circuit Low Voltage DTC P0B84 Hybrid/EV Battery 15 Circuit High Voltage DTC P0B86 Hybrid/EV Battery 16 Circuit DTC P0B87 Hybrid/EV Battery 16 Circuit Performance DTC P0B88 Hybrid/EV Battery 16 Circuit Low Voltage DTC P0B89 Hybrid/EV Battery 16 Circuit High Voltage DTC P0B8B Hybrid/EV Battery 17 Circuit DTC P0B8C Hybrid/EV Battery 17 Circuit Performance DTC P0B8D Hybrid/EV Battery 17 Circuit Low Voltage DTC P0B8E Hybrid/EV Battery 17 Circuit High Voltage DTC P0B90 Hybrid/EV Battery 18 Circuit DTC P0B91 Hybrid/EV Battery 18 Circuit Performance DTC P0B92 Hybrid/EV Battery 18 Circuit Low Voltage DTC P0B93 Hybrid/EV Battery 18 Circuit High Voltage DTC P0B95 Hybrid/EV Battery 19 Circuit DTC P0B96 Hybrid/EV Battery 19 Circuit Performance DTC P0B97 Hybrid/EV Battery 19 Circuit Low Voltage DTC P0B98 Hybrid/EV Battery 19 Circuit High Voltage DTC P0B9A Hybrid/EV Battery 20 Circuit DTC P0B9B Hybrid/EV Battery 20 Circuit Performance DTC P0B9C Hybrid/EV Battery 20 Circuit Low Voltage DTC P0B9D Hybrid/EV Battery 20 Circuit High Voltage DTC P0B9F Hybrid/EV Battery 21 Circuit DTC P0BA0 Hybrid/EV Battery 21 Circuit Performance DTC P0BA1 Hybrid/EV Battery 21 Circuit Low Voltage DTC P0BA2 Hybrid/EV Battery 21 Circuit High Voltage DTC P0BA4 Hybrid/EV Battery 22 Circuit DTC P0BA5 Hybrid/EV Battery 22 Circuit Performance DTC P0BA6 Hybrid/EV Battery 22 Circuit Low Voltage DTC P0BA7 Hybrid/EV Battery 22 Circuit High Voltage DTC P0BA9 Hybrid/EV Battery 23 Circuit DTC P0BAA Hybrid/EV Battery 23 Circuit Performance DTC P0BAB Hybrid/EV Battery 23 Circuit Low Voltage DTC P0BAC Hybrid/EV Battery 23 Circuit High Voltage DTC P0BAE Hybrid/EV Battery 24 Circuit DTC P0BAF Hybrid/EV Battery 24 Circuit Performance DTC P0BB0 Hybrid/EV Battery 24 Circuit Low Voltage DTC P0BB1 Hybrid/EV Battery 24 Circuit High Voltage DTC P0BB3 Hybrid/EV Battery 25 Circuit DTC P0BB4 Hybrid/EV Battery 25 Circuit Performance DTC P0BB5 Hybrid/EV Battery 25 Circuit Low Voltage DTC P0BB6 Hybrid/EV Battery 25 Circuit High Voltage DTC P0BB8 Hybrid/EV Battery 26 Circuit DTC P0BB9 Hybrid/EV Battery 26 Circuit Performance DTC P0BBA Hybrid/EV Battery 26 Circuit Low Voltage DTC P0BBB Hybrid/EV Battery 26 Circuit High Voltage DTC P1B16 Hybrid/EV Battery 27 Circuit Performance DTC P1B17 Hybrid/EV Battery 27 Circuit Low Voltage DTC P1B18 Hybrid/EV Battery 27 Circuit High Voltage DTC P1B19 Hybrid/EV Battery 28 Circuit Performance DTC P1B1A Hybrid/EV Battery 28 Circuit Low Voltage DTC P1B1B Hybrid/EV Battery 28 Circuit High Voltage DTC P1B1C Hybrid/EV Battery 29 Circuit Performance DTC P1B1D Hybrid/EV Battery 29 Circuit Low Voltage DTC P1B1E Hybrid/EV Battery 29 Circuit High Voltage DTC P1B1F Hybrid/EV Battery 30 Circuit Performance DTC P1B20 Hybrid/EV Battery 30 Circuit Low Voltage DTC P1B21 Hybrid/EV Battery 30 Circuit High Voltage DTC P1B22 Hybrid/EV Battery 31 Circuit Performance DTC P1B23 Hybrid/EV Battery 31 Circuit Low Voltage DTC P1B24 Hybrid/EV Battery 31 Circuit High Voltage DTC P1B25 Hybrid/EV Battery 32 Circuit Performance DTC P1B26 Hybrid/EV Battery 32 Circuit Low Voltage DTC P1B27 Hybrid/EV Battery 32 Circuit High Voltage DTC P1B28 Hybrid/EV Battery 27 Circuit DTC P1B29 Hybrid/EV Battery 28 Circuit DTC P1B2A Hybrid/EV Battery 29 Circuit DTC P1B2B Hybrid/EV Battery 30 Circuit DTC P1B2C Hybrid/EV Battery 31 Circuit DTC P1B2D Hybrid/EV Battery 32 Circuit DTC P1B3D Hybrid Battery Voltage Sense Low Reference 1 Circuit DTC P1B3E Hybrid Battery Voltage Sense Low Reference 2 Circuit
DTC P0BBEDTC P0BBE Hybrid Battery Pack Voltage
DTC P0C77 or P0C78DTC P0C77 Hybrid Battery System Precharge Time Too Short DTC P0C78 Hybrid Battery System Precharge Time Too Long
DTC P1A01, P1A05, P1A06, or P1A5CDTC P1A01 Battery Energy Control Module Long Term Memory Performance DTC P1A05 Battery Energy Control Module Random Access Memory (RAM) DTC P1A06 Battery Energy Control Module Read Only Memory (ROM) DTC P1A5C Battery Energy Control Module Main Processor Performance
DTC P1A0CDTC P1A0C Battery Energy Control Module System Voltage Low
DTC P1A5DDTC P1A5D Battery Energy Control Module 5 Volt Reference 2 Circuit
DTC P1A5E or P1A5FDTC P1A5E Battery Energy Control Module Ignition 1 Switch Circuit Low Voltage DTC P1A5F Battery Energy Control Module Ignition 1 Switch Circuit High Voltage
DTC P1A60DTC P1A60 Battery Energy Control Module Ignition Accessory Switch Circuit Low Voltage
DTC P1B11DTC P1B11 Drive Motor Control Module Hybrid AC Voltage System Isolation Lost
DTC P1B33-P1B39DTC P1B33 Battery Energy Control Module Hybrid Battery Voltage Balance Circuit DTC P1B34 Battery Energy Control Module Hybrid Battery Voltage Balance Processor 1 Performance DTC P1B35 Battery Energy Control Module Hybrid Battery Voltage Balance Processor 2 Performance DTC P1B36 Battery Energy Control Module Hybrid Battery Voltage Balance Processor 3 Performance DTC P1B37 Battery Energy Control Module Hybrid Battery Voltage Balance Processor 4 Performance DTC P1B38 Battery Energy Control Module Hybrid Battery Voltage Balance Processor 5 Performance DTC P1B39 Battery Energy Control Module Hybrid Battery Voltage Balance Processor 6 Performance
DTC P1B3F or P1B40DTC P1B3F High Voltage System Interlock Circuit 2 Low Voltage DTC P1B40 High Voltage System Interlock Circuit 2 High Voltage
DTC P1E0C or P1E0DDTC P1E0C Hybrid Battery Voltage Isolation Sensing Circuit 2 Low Voltage DTC P1E0D Hybrid Battery Voltage Isolation Sensing Circuit 2 High Voltage
DTC P1E0F-P1E11DTC P1E0F Hybrid Battery Voltage Isolation High Resolution Sensing Circuit 1 Low Voltage DTC P1E10 Hybrid Battery Voltage Isolation High Resolution Sensing Circuit 1 High Voltage DTC P1E11 Hybrid Battery Voltage Isolation High Resolution Sensing Circuit 1 Performance
DTC P1E12-P1E14DTC P1E12 Hybrid Battery Voltage Isolation High Resolution Sensing Circuit 2 Low Voltage DTC P1E13 Hybrid Battery Voltage Isolation High Resolution Sensing Circuit 2 High Voltage DTC P1E14 Hybrid Battery Voltage Isolation High Resolution Sensing Circuit 2 Performance
DTC P1E3DDTC P1E3D Control Module Calculated Hybrid Battery Performance
DTC P1EAADTC P1EAA Hybrid Battery Voltage Balance Processor Multiplexer Performance
DTC P1EABDTC P1EAB Battery Energy Control Module Hybrid/EV Battery Cell Overvoltage
DTC P1EACDTC P1EAC Hybrid/EV Battery Cell Overvoltage Signal/Circuit Performance

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/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
5 V ReferenceP0641, P057C, P1B3FP1B3FP0641, P1B40
SignalP1B3FP1B3FP1B40

Circuit/System Description

The high voltage interlock circuits are utilized to verify high voltage component integrity. The high voltage interlock circuits are two circuit loops that passes through certain high voltage components. The high voltage interlock circuits are used to determine if access to high voltage components is being attempted. The opening of these high voltage components causes high voltage interlock circuit to open. The starter/generator control module monitors both the high voltage interlock 5 V reference circuit voltage and the high voltage interlock signal circuit voltage in order to detect circuit faults. When the starter/generator control module detects a loss of high voltage interlock circuit voltage, the high voltage contactors are commanded open.

The service cover for the starter/generator and the service cover for the hybrid/EV battery pack each contain a high voltage interlock switch. When either cover is removed, the stater/generator control module will respond by opening the high voltage contacts. The 5 V reference circuits and signal circuits for each of the two high voltage interlock loops are completely separate from one another and are monitored as two separate loops, with each setting a specific DTC to indicate a circuit fault. The 5 V reference circuit that feeds the high voltage interlock switch on the starter/generator also supplies the 5 V reference to the brake pedal position sensor.

Conditions for Running the DTC

Ignition voltage is greater than 10 V

Conditions for Setting the DTC

Voltage on the 5 V reference circuit 1 is less than 4.39 V or greater than 4.61 V

Action Taken When the DTC Sets

DTCs P0641 is a type B DTCs

Conditions for Clearing the DTC

DTCs P0641 is a type B DTCs

Diagnostic Aids

  1. When a circuit fault is detected on the high voltage interlock loop that feeds the starter/generator and the vehicle hood is opened, the starter/generator control module will respond by turning off inverter switching. This will prevent the starter/generator from charging the hybrid/EV battery pack and supplying voltage to the starter/generator control module 12 V output. Operating in this manner will cause an eventual discharge of both the high voltage battery pack and the 12 V battery.
  2. Because the 5 V reference circuit also supplies voltage to the brake pedal position sensor, a circuit fault on the high voltage interlock loop that feeds the starter/generator will also cause hybrid functions that rely on the brake pedal position, such as auto-stop and regenerative braking, to be disabled.

Reference Information

Schematic Reference

  1. «Hybrid Energy Storage Schematics»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  2. «Exterior Lights Schematics»(/buick/regal/v-2009-2013/remont/exterior-lights/#lighting-system)

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

Circuit/System Testing

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, disconnect the harness connector at the B22 brake pedal position sensor and disconnect the X1 harness connector at the A15 starter/generator, ignition ON.
  2. Test for 4.8-5.2 V between the A15 starter/generator 5 V reference circuit terminal 12 X1 and ground. If less than 4.8 V Ignition OFF, disconnect the X2 harness connector at the K59 starter/generator control module. Test for infinite resistance between the A15 starter/generator 5 V reference circuit terminal 12 X1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for infinite resistance between the B22 brake pedal position sensor 5 V reference circuit terminal 6 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the A15 starter/generator 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K59 starter/generator control module. If greater than 5.2 V Ignition OFF, disconnect the X2 harness connector at the K59 starter/generator control module. Test for less than 1 V between the A15 starter/generator 5 V reference circuit terminal 12 X1 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 1 V between the B22 brake pedal position sensor 5 V reference circuit terminal 6 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K59 starter/generator control module. If between 4.8-5.2 V
  3. Ignition OFF, connect the harness connector at the A15 starter/generator, ignition ON.
  4. Verify DTC P0641 does not set while operating the vehicle within the conditions for running the DTC. If the DTC sets Replace the A15 starter/generator. If the DTC does not set
  5. Test or replace the B22 brake pedal position sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Starter Generator Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-control-system)
  2. «Brake Pedal Position Sensor Replacement»(/buick/regal/v-2009-2013/remont/exterior-lights/#lighting-system__brake-pedal-position-sensor-replacement)
  3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for starter/generator control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/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 ReferenceP0651, P0A0CP0A0CP0651, P0A0D
SignalP0A0CP0A0CP0651, P0A0D

The high voltage interlock circuit is utilized to verify high voltage component integrity. High voltage interlock circuit is a circuit loop that passes through certain high voltage components. High voltage interlock circuit is used to determine if access to high voltage components is being attempted. The opening of these high voltage components causes high voltage interlock circuit to open. The starter/generator control module monitors both the high voltage interlock 5 V reference circuit voltage and the high voltage interlock signal circuit voltage in order to detect circuit faults. When the starter/generator control module detects a loss of high voltage interlock circuit voltage, the high voltage contactors are commanded open.

Battery voltage is greater than 6 V

DTC P0651

Voltage on the 5 V reference circuit 2 is less than 4.39 V or greater than 4.61 V

DTC P0A0C

Voltage on the high voltage interlock signal circuit is less than 0.5 V

DTC P0A0D

Voltage on the high voltage interlock signal circuit is grater than 4.5 V

DTCs P0651, P0A0C, and P0A0D are type B DTCs

DTCs P0651, P0A0C, and P0A0D are type B DTCs

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, disable high voltage at the A4 hybrid/EV battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Connect the 12 V battery, ignition ON.
  3. Test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground. If less than 4.8 V Ignition OFF, disconnect the X4 harness connector at the K59 starter/generator control module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K59 starter/generator control module. If greater than 5.2 V Ignition OFF, disconnect the X4 harness connector at the K59 starter/generator control module. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K59 starter/generator control module. If between 4.8-5.2 V
  4. Verify DTC P0A0D is not set. If the DTC is set Ignition OFF, disconnect the X4 harness connector at the K59 starter/generator control module. Test for less than 1 V between the signal circuit terminal B and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K59 starter/generator control module. If the DTC is not set
  5. Ignition OFF, connect a 3 A fused jumper wire between the 5 V reference circuit terminal A and the signal circuit terminal B, ignition ON.
  6. Verify DTC P0A0C is not set. If the DTC is set Ignition OFF, disconnect the X4 harness connector at the K59 starter/generator control module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K59 starter/generator control module. If the DTC is not set
  7. Test or replace the F102 hybrid/EV battery pack cable cover.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Generator Control Module Cable Cover Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  2. «Battery Energy Control Module Wiring Harness Replacement (BDU, BECM and BPIM)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) , «Battery Energy Control Module Wiring Harness Replacement (HV Measuring Harness 1 and 2)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for starter/generator control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The starter/generator control module monitors the internal battery resistance of the battery pack as a means to determine if the battery has reached it's end of life.

  1. Average battery temperature is greater than -10° C.
  2. Battery state estimator mode is active.
  3. Battery state of charge is great than 10%, but less than 90%.
  4. None of the following DTCs are set: P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEA, P0AEB, P0B45, P0B46, P0B47, P0B48, P0B4F, P0B50, P0B51, P0B52, P0B63, P0B64, P0B65, P0B66, P0B95, P0B96, P0B97, P0B98, P0B9F, P0BA0, P0BA1, P0BA2, P0BC3, P0BC4, P0BC5, P0C34, P0C35, P0C36, P1ASD, or P1A5D.

The battery pack internal resistance is greater than the end of life battery pack resistance.

DTC P0A80 is a type A DTC.

DTC P0A80 is a type A DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

Circuit/System Verification

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition ON.
  2. Verify DTC P0A80 is not set. If the DTC is set Replace the C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2. If the DTC is not set
  3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The vehicle is equipped with a high voltage isolation monitor feature. The purpose of the isolation monitor is to test the resistance between the high voltage positive and negative direct current (DC) bus and chassis ground. The isolation monitoring system measures the resistance between the high voltage system and chassis ground in the following way. The isolation monitoring system measures voltage potential difference between the positive battery mid pack voltage and chassis ground as well as the voltage difference between negative battery mid pack voltage and chassis ground. These voltage values are used by the starter/generator control module to calculate a resistance value between the high voltage bus and the chassis ground. If this resistance value is too low, a high voltage isolation fault has occurred.

P0AA8

  1. Power mode is RUN or CRANK.
  2. The starter/generator control module internal voltage sensor has no reported faults.
  3. None of the following DTCs are set: P0AA9, P0AAA, P1E0C, or P1E0D.

P0AA9

  1. Power mode is RUN or CRANK.
  2. Contactors are closed.

P0AAA

  1. Power mode is RUN or CRANK.
  2. None of the following DTCs are set: P0AA9, P0AAA, P1E0C, or P1E0D.

P0AA8

The difference between the voltage measured at the starter/generator control module internal motor control processor and the sum of the mid-pack voltage positive sensor value and mid-pack voltage negative sensor value is greater than 15 V.

P0AA9

Voltage measured at the negative mid-pack voltage sensor is less than 5 V.

P0AAA

he difference between the voltage measured at the negative mid-pack voltage sensor and the starter/generator control module internal motor control processor high voltage value is greater than 15 V.

  1. DTCs P0AA8-P0AAA are type B DTCs.
  2. If the DTC sets while there is a loss of communication with the sensing and diagnostic module (SDM), the starter/generator control module will record the fault as a crash event and the DTC will become latched.
  1. DTCs P0AA8-P0AAA are type B DTCs.
  2. If the DTC is set as a latched DTC, the crash event must be cleared before the DTC will clear.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition ON.
  2. Verify DTC P0AA8, P0AA9, or P0AAA is not set. If any of the DTCs are set Replace the K59 starter/generator control module. If none of the DTCs are set
  3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for starter/generator control module replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid battery pack contains a total of 32 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 118 V DC. The battery cells are grouped together into two sections, each with 16 cell groups.

The battery energy control module monitors the voltage of the 32 battery cell groups. A voltage sense circuit is attached to each individual cell group. Each of these circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness connectors the voltage sense circuits to the battery energy control module, located directly above the hybrid battery pack. The battery energy control module also monitors the hybrid battery pack voltage in it's entirety. The battery energy control module compares the voltage of the entire pack to that of the sum of the voltages measures at each cell.

Diagnostics and system status are communicated from the battery energy control module to hybrid powertrain control module through serial data.

P0ABB

None of the following DTCs are set: P0ABC, P0ABD, P0B3D, P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88, P0B8D, P0B92, P0B97, P0B9C, P0BA1, P0BA6, P0BAB, P0BB0, P0BB5, P0BBA, P1B17, P1B1A, P1B1D, P1B20, P1B23, P1B26, P0B3E, P0B43, P0B48, P0B4D, P0B52, P0B57, P0B5C, P0B61, P0B66, P0B6B, P0B70, P0B75, P0B7A, P0B7F, P0B84, P0B89, P0B8E, P0B93, P0B98, P0B9D, P0BA2, P0BA7, P0BAC, P0BB1, P0BB6, P0BBB, P1B18, P1B1B, P1B1E, P1B21, P1B24, P1B27, P0B3B, P0B40, P0B45, P0B4A, P0B4F, P0B54, P0B59, P0B5E, P0B63, P0B68, P0B6D, P0B72, P0B77, P0B7C, P0B81, P0B86, P0B8B, P0B90, P0B95, P0B9A, P0B9F, P0BA4, P0BA9, P0BAE, P0BB3, P0BB8, P1B28, P1B29, P1B2A, P1B2B, P1B2C, P1B2D, P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C, P0B91, P0B96, P0B9B, P0BA0, P0BA5, P0BAA, P0BAF, P0BB4, P0BB9, P1B16, P1B19, P1B1C, P1B1F, P1B22, P1B25.

P0ABC or P0ABD

  1. Battery voltage is greater than 9.6 V.
  2. Battery energy control module is awake and communicating.

P0ABB

The calculated battery pack voltage based on the average cell voltage values is more than 5.49 V different than the actual measured battery pack voltage.

P0ABC

The battery pack voltage is less than 30 V.

P0ABD

The battery pack voltage is greater than 190 V.

  1. DTCs P0ABB, P0ABC, and P0ABD are type B DTCs.
  2. The vehicle operates in a low battery mode with the high voltage contactors closed, but no hybrid functions will occur.

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

Opening the service disconnect without first disconnecting the 12 V battery or reconnecting the 12 V battery while the service disconnect is open may result in the setting of DTC P0ABB or P0ABC. Due to the nature of the hybrid battery pack design, the vehicle's 12 V electrical system will continue to discharge the high voltage battery, even though the service disconnect is open. This will eventually lower the voltage of the hybrid battery pack and set DTC P0ABB or P0ABC. If this occurs, close the service disconnect and operate the vehicle as normal. The hybrid battery pack will be charged and the voltage will return to normal.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition ON.
  2. Verify the 12 V battery is not connected while the service disconnected is open. If the 12 V battery is connected and the service disconnect is open It is normal to set DTC P0ABB or P0ABC when the service disconnect is open and the 12 V battery is connected. After service is complete, return the vehicle to it's normal state, close the service disconnect, connect the 12 V battery, and clear all DTCs. If the 12 V battery is connected and the service disconnect is closed
  3. Verify DTC P0ABB, P0ABC, or P0ABD is not set. If any of the DTCs are set NOTE: In «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) , perform the disabling procedure for servicing components within the A4 hybrid/EV battery pack. The C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2 will be disconnected as part of the disabling procedure. Ignition OFF, disable high voltage at the A4 hybrid battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) . Verify the battery energy control module high voltage measuring harness is not cut, chafed, or otherwise damaged. If the harness is damaged, replace the harness. If the harness is not damaged Replace the K16 battery energy control module If none of the DTCs are set
  4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Battery Energy Control Module Wiring Harness Replacement (BDU, BECM and BPIM)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) , «Battery Energy Control Module Wiring Harness Replacement (HV Measuring Harness 1 and 2)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery energy control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/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 ReferenceP1A07P0AC2P1A07
SignalP0AC1P0AC2P1A07P1EBA
Low ReferenceP0AC2

The battery energy control module uses a single battery current sensor to determine the current flow out of the hybrid battery pack. The battery energy control module applies 5 volt and provides a low reference to power the sensor. Current measurement is communicated to the battery energy control module via a signal circuit.

P0AC1, P0AC2

  1. 12 V battery voltage is greater than 8.8 V
  2. Battery energy control module is awake and communicating
  3. DTC P1A07 is not set.

P1A07

  1. 12 V battery voltage is greater than 8.8 V
  2. Battery energy control module is awake and communicating

P1EBA

  1. 12 V battery voltage is greater than 8.8 V
  2. Battery energy control module is awake and communicating
  3. Contactors are open
  4. DTC P1A07 is not set.

P0AC1

Current sensor signal voltage is less than 0.2 V

P0AC2

Current sensor signal voltage is greater than 4.8 V

P1A07

  1. Current sensor 5 volt reference voltage is greater than 5.2 V
  2. Current sensor 5 volt reference voltage is less than 4.8 V

P1EBA

  1. Current sensor value is more than 2.43 V greater than sensor offset upper limit
  2. Current sensor value is more than 2.57 V less than sensor offset lower limit

DTC P0AC1, P0AC2, P1A07, and P1EBA are type B DTCs

DTC P0AC1, P0AC2, P1A07, and P1EBA are type B DTCs

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

  1. Ignition ON.
  2. Verify the scan tool Hybrid/EV Battery Pack Low Resolution Current Sensor parameter is between 85 A and -85 A and varies as the vehicle is driven. If not between 85 A and -85 A or does not vary Refer to Circuit/System Testing. If between 85 A and -85 A and varies
  3. All OK.
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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, disable high voltage at the A4 hybrid/EV battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Connect the 12 V battery.
  3. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B30 hybrid/EV battery pack current sensor. It may take up to 2 minutes for all vehicle systems to power down.
  4. Test for less than 10 ohms between the low reference circuit terminal 3 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the K16 battery energy control module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K16 battery energy control module. If less than 10 ohms
  5. Ignition ON.
  6. Test for 4.8-5.2 V between the 5 V reference circuit terminal 2 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K16 battery energy control module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K16 battery energy control module. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K16 battery energy control module, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K16 battery energy control module. If between 4.8-5.2 V
  7. Verify the scan tool Hybrid/EV Battery Pack Low Resolution Current Sensor parameter is greater than 25 A. If 25 A or less Ignition OFF, disconnect the harness connector at the K16 battery energy control module. Test for infinite resistance between the signal circuit terminal 4 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K16 battery energy control module. If greater than 50 A
  8. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 3.
  9. Verify the scan tool Hybrid/EV Battery Pack Low Resolution Current Sensor parameter is less than -25 A. If -25 A or greater Ignition OFF, disconnect the harness connector at the K16 battery energy control module, ignition ON. Test for less than 1 V between the signal circuit terminal 4 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition ON. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K16 battery energy control module. If less than -25 A
  10. Test or replace the B30 hybrid/EV battery pack current sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Battery Energy Control Module Wiring Harness Replacement (BDU, BECM and BPIM)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) , «Battery Energy Control Module Wiring Harness Replacement (HV Measuring Harness 1 and 2)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery energy control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/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
B+U0293, U1817*P0ADB, P0AE6
Pre-charge Contactor ControlP0AE6, P0C76**P0AE6P1A56***
Main Contactor ControlP0ADB, P0C76**P0ADBP1A56***
*Fuse F23UA open; no communication with starter generator control module **The starter generator control module cannot control the contactor to disable high voltage ***The starter generator control module cannot control the contactor to enable high voltage

The hybrid battery system voltage is controlled by two high voltage contactors. The high voltage contactors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the hybrid battery pack assembly. Of the two contactors, one is a pre-charge contactor and the other is the primary contactor. The two contactors are closed in a specific sequence by the starter/generator control module. The pre-charge contactor is closed first. This causes high voltage to flow through the pre-charge resistor, allowing system voltage to build slowly. Once the system voltage has raised and stabilized, the primary contactor is closed. Both contactors are controlled by the starter/generator control module. The starter/generator control module supplies B+ to each contactor at all times. When the contactors are to be closed, the starter/generator control module will provide a ground to the contactor through a low side driver.

The 12 V battery voltage is greater than 6.0 V

P0ADB

  1. An open is detected on the primary contactor control circuit when the contactor control is commanded ON and measured resistance is greater than 200K ohms
  2. A short to voltage is detected on the primary contactor control circuit when the contactor control is commanded ON and current sense feedback is less than 0.5 A

P0ADC

A short to ground is detected on the primary contactor control circuit when the contactor control is commanded OFF and current sense feedback is less than 0.5 A

DTCs P0ADB and P0ADC are type B DTCs

DTCs P0ADB and P0ADC are type B DTCs

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

  1. Ignition ON.
  2. Verify DTC P0AE6 or P0AE7 is not set. If either of the DTCs are set Refer to «DTC P0AE6 or P0AE7»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) . If none of the DTCs are set
  3. Refer to Circuit/System Testing
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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, disable high voltage at the A4 hybrid/EV battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Connect the 12 V battery.
  3. Disconnect the X1 harness connector at the KR38 main contactor, ignition ON.
  4. Verify a test lamp illuminates between the B+ circuit terminal 1 and ground. If the test lamp does not illuminate Ignition OFF, disconnect the harness connector at the K59 starter/generator control module. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K59 starter/generator control module. If the test lamp illuminates
  5. Ignition OFF, connect the harness connector at the KR38 main contactor. Disconnect the X4 harness connector at the K59 starter/generator control module, ignition ON.
  6. Test for less than 1 V between the control circuit terminal 5 and ground. If 1 V or greater Ignition OFF, disconnect the X1 harness connector at the KR38 main contactor. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the KR38 main contactor. If less than 1 V
  7. Ignition OFF.
  8. Test for infinite resistance between the control circuit terminal 5 and ground. If less than infinite resistance Ignition OFF, disconnect the X1 harness connector at the KR38 main contactor. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, test or replace the KR38 main contactor. If infinite resistance
  9. Test for 20-40 ohms between the B+ circuit terminal 4 and the control circuit terminal 5. If not between 20-40 ohms Ignition OFF, disconnect the X1 harness connector at the KR38 main contactor. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the KR38 main contactor. If between 20-40 ohms
  10. Replace the K59 starter/generator control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for starter/generator control module replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/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
B+U0293, U1817*P0ADB, P0AE6
Pre-charge Contactor ControlP0AE6, P0C76**P0AE6P1A56***
Main Contactor ControlP0ADB, P0C76**P0ADBP1A56***
*Fuse F23UA open; no communication with starter generator control module **The starter generator control module cannot control the contactor to disable high voltage ***The starter generator control module cannot control the contactor to enable high voltage

The hybrid battery system voltage is controlled by two high voltage contactors. The high voltage contactors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the hybrid battery pack assembly. Of the two contactors, one is a pre-charge contactor and the other is the primary contactor. The two contactors are closed in a specific sequence by the starter/generator control module. The pre-charge contactor is closed first. This causes high voltage to flow through the pre-charge resistor, allowing system voltage to build slowly. Once the system voltage has raised and stabilized, the primary contactor is closed. Both contactors are controlled by the starter/generator control module. The starter/generator control module supplies B+ to each contactor at all times. When the contactors are to be closed, the starter/generator control module will provide a ground to the contactor through a low side driver.

The 12 V battery voltage is greater than 6.0 V

P0AE6

  1. An open is detected on the pre-charge contactor control circuit when the contactor control is commanded ON and measured resistance is greater than 200K ohms
  2. A short to voltage is detected on the pre-charge contactor control circuit when the contactor control is commanded ON and current sense feedback is less than 0.5 A

P0AE7

A short to ground is detected on the pre-charge contactor control circuit when the contactor control is commanded OFF and current sense feedback is less than 0.5 A

DTCs P0AE6 and P0AE7 are type B DTCs

DTCs P0AE6 and P0AE7 are type B DTCs

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, disable high voltage at the A4 hybrid/EV battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Connect the 12 V battery.
  3. Disconnect the X1 harness connector at the KR134 pre-charge contactor, ignition ON.
  4. Verify a test lamp illuminates between the B+ circuit terminal A and ground. If the test lamp does not illuminate Ignition OFF, disconnect the harness connector at the K59 starter/generator control module. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K59 starter/generator control module. If the test lamp illuminates
  5. Ignition OFF, connect the harness connector at the KR134 pre-charge contactor. Disconnect the X4 harness connector at the K59 starter/generator control module, ignition ON.
  6. Test for less than 1 V between the control circuit terminal 6 and ground. If 1 V or greater Ignition OFF, disconnect the X2 harness connector at the KR134 pre-charge contactor. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the KR134 pre-charge contactor. If less than 1 V
  7. Ignition OFF.
  8. Test for infinite resistance between the control circuit terminal 6 and ground. If less than infinite resistance Ignition OFF, disconnect the X2 harness connector at the KR134 pre-charge contactor Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, test or replace the KR134 pre-charge contactor. If infinite resistance
  9. Test for 90-115 ohms between the B+ circuit terminal 4 and the control circuit terminal 6. If not between 90-115 ohms Ignition OFF, disconnect the X2 harness connector at the KR134 pre-charge contactor. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the KR134 pre-charge contactor. If between 20-40 ohms
  10. Replace the K59 starter/generator control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for starter/generator control module replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

As a means to verify the battery energy control module's voltage measuring ability, the battery energy control module compares it's own measurement of the hybrid battery pack voltage to that measured internally at the starter/generator control module when the contactors are closed. This provides a second source of the battery energy control module's hybrid battery pack voltage rationality.

  1. Main contactor is closed
  2. None of the following DTCs are set: P0ABB, P0ABC, P0ABD, P1A5D, U182A

The difference between the high voltage battery voltage measured at the battery energy control module and the voltage measured at the motor controller, internal to the starter/generator control module, is greater than 5.77 V.

  1. DTC P0AF8 is a type B DTC
  2. The vehicle operates in a low battery mode with the high voltage contactors closed, but no hybrid functions will occur

DTC P0AF8 is a type B DTC

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Verify no other DTCs are set in the in the K59 starter/generator control module. If other DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If no other DTCs are set
  2. Ignition ON, observe and record the 32 scan tool Hybrid Battery Cell Voltage parameters. Add the values together to calculate hybrid battery pack voltage based on the cell voltages.
  3. Verify the calculated hybrid battery pack voltage from step 2 is within 5.77 V of the scan tool High Voltage Battery Voltage parameter. If not within 5.77 V NOTE: In «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) , perform the disabling procedure for servicing components within the A4 hybrid/EV battery pack. The C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2 will be disconnected as part of the disabling procedure. Ignition OFF, disable high voltage at the A4 hybrid battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) . Verify the battery energy control module high voltage measuring harness is not cut, chafed, or otherwise damaged. If the harness is damaged, replace the harness. If the harness is not damaged Replace the K16 battery energy control module If within 5.77 V
  4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Battery Energy Control Module Wiring Harness Replacement (BDU, BECM and BPIM)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) , «Battery Energy Control Module Wiring Harness Replacement (HV Measuring Harness 1 and 2)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery energy control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid battery pack contains a total of 32 cells in the hybrid/EV battery pack. These cells are electrically connected in series. Each individual cell is rated at 3.7 V, for a nominal system voltage of 118 V DC. The battery cells are grouped together into two sections, each with 16 cells.

The battery energy control module monitors the voltage of the 32 battery cells. A voltage sense circuit is attached to each individual cell. Each of these circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness connectors the voltage sense circuits to the battery energy control module, located directly above the hybrid battery section 1 and hybrid battery section 2. The battery energy control module also monitors the hybrid battery pack voltage in it's entirety. The battery energy control module compares the voltage of the entire pack to that of the sum of the voltages measures at each cell.

None of the following DTCs are set: P0ABB, P0ABC, P0ABD, P0AF8, P1A5D, U182A

OR

None of the following DTCs are set: P0B3B, P0B3C, P0B3D, P0B3E, P0B40, P0B41, P0B42, P0B43, P0B45, P0B46, P0B47, P0B48, P0B4A, P0B4B, P0B4C, P0B4D, P0B4F, P0B50, P0B51, P0B52, P0B54, P0B55, P0B56, P0B57, P0B59, P0B5A, P0B5B, P0B5C, P0B5E, P0B5F, P0B60, P0B61, P0B63, P0B64, P0B65, P0B66, P0B68, P0B69, P0B6A, P0B6B, P0B6D, P0B6E, P0B6F, P0B70, P0B72, P0B73, P0B74, P0B75, P0B77, P0B78, P0B79, P0B7A, P0B7C, P0B7D, P0B7E, P0B7F, P0B81, P0B82, P0B83, P0B84, P0B86, P0B87, P0B88, P0B89, P0B8B, P0B8C, P0B8D, P0B8E, P0B90, P0B91, P0B92, P0B93, P0B95, P0B96, P0B97, P0B98, P0B9A, P0B9B, P0B9C, P0B9D, P0B9F, P0BA0, P0BA1, P0BA2, P0BA4, P0BA5, P0BA6, P0BA7, P0BA9, P0BAA, P0BAB, P0BAC, P0BAE, P0BAF, P0BB0, P0BB1, P0BB3, P0BB4, P0BB5, P0BB6, P0BB8, P0BB9, P0BBA, P0BBB, P1B16, P1B17, P1B18, P1B19, P1B1A, P1B1B, P1B1C, P1B1D, P1B1E, P1B1F, P1B20, P1B21, P1B22, P1B23, P1B24, P1B25, P1B26, P1B27, P1B28, P1B29, P1B2A, P1B2B, P1B2C, P1B2D

DTC P0AFA

Battery pack voltage is less than 61.91 V

OR

Any individual cell voltage is less than 1.93 V

DTC P0AFB

Battery pack voltage is greater than 136.49 V

OR

Any individual cell voltage is greater than 4.26 V

  1. DTCs P0AFA and P0AFB are type B DTCs
  2. The vehicle operates in a low battery mode with the high voltage contactors closed, but no hybrid functions will occur
  1. DTCs P0AFA and P0AFB are type B DTCs
  2. DTCs P0AFA and P0AFB are secure DTCs. The «Clear Secured High Voltage DTCs»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) procedure must be performed to prevent resetting the DTC.

The following two tables should be used to determine the switch setting when using the EL-48571-30 High Voltage Battery Pin Out Box.

Battery Cells (1-16)
Connector X5
Switch DesignationSwitch PositionBattery Cell
A116
A215
A314
A413
A512
A611
B710
B89
B98
B107
B116
B125
C134
C143
C152
C161
Battery Cells (17-32)
Connector X4
Switch DesignationSwitch PositionBattery Cell
A132
A231
A330
A429
A528
A627
B726
B825
B924
B1023
B1122
B1221
C1320
C1419
C1518
C1617

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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-48571-30 High Voltage Battery Pin Out Box

EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

  1. Ignition ON.
  2. Verify that each of the scan tool Hybrid Battery Cell Voltage 1-32 parameters are between 3.0-4.1 V and all parameters are within 0.1 V of each other. If any parameter is not between 3.0-4.1 V or is not within 0.1 V of the others Refer to Circuit/System Testing. If all parameter are between 3.0-4.1 V and are within 0.1 V of each other
  3. All OK.
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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, disable high voltage at the A4 hybrid battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Disconnect the X1 and X2 harness connectors K16 battery energy control module.
  3. Connect the EL-48571-30 high voltage battery pin out box to the appropriate K16 battery energy control module harness connector.
  4. Insert the DMM probes into the EL-48571-30 test cavities.
  5. Measure and record the voltage of each of the cells by cycling the EL-48571-30 through each of the 16 switch positions.
  6. Verify that each cell voltage reading is 3.0-4.1 V and all cell voltage readings are within 0.1 V of each other. If any parameter is not between 3.0-4.1 V or is not within 0.1 V of the others Inspect the appropriate voltage signal circuit and low reference circuit for a short to ground or an open/high resistance. If a short to ground or an open/high resistance is found, replace the appropriate battery energy control module high voltage measuring harness. If a short to ground or an open/high resistance is not found Replace the C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2. If all parameter are between 3.0-4.1 V and are within 0.1 V of each other
  7. Replace the K16 battery energy control module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Generator Battery Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  2. «Battery Energy Control Module Wiring Harness Replacement (BDU, BECM and BPIM)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) , «Battery Energy Control Module Wiring Harness Replacement (HV Measuring Harness 1 and 2)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery energy control module replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid battery pack contains a total of 32 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 118 V DC. The battery cells are grouped together into two sections, each with 16 cell groups.

The battery energy control module monitors the voltage of the 32 battery cell groups. A voltage sense circuit is attached to each individual cell group. Each of these circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness connectors the voltage sense circuits to the battery energy control module, located directly above the hybrid battery pack.

Diagnostics and system status are communicated from the battery energy control module to hybrid powertrain control module through serial data.

DTC P0B3B, P0B40, P0B45, P0B4A, P0B4F, P0B54, P0B59, P0B5E, P0B63, P0B68, P0B6D, P0B72, P0B77, P0B7C, P0B81, P0B86, P0B88, P0B90, P0B95, P0B9A, P0B9F, P0BA4, P0BA9, P0BAE, P0BB3, P0BB8, P1B28, P1B29, P1B2A, P1B2B, P1B2C, P1B2D

  1. 12 V battery voltage is greater than 9 V
  2. None of the following DTCs are set: P0B3D, P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88, P0B8D, P0B92, P0B97, P0B9C, P0BA1, P0BA6, P0BAB, P0BB0, P0BB5, P0BBA, P1B17, P1B1A, P1B1D, P1B20, P1B23, P1B26, P1B33, P1B34, P1B35, P1B36, P1B37, P1B38, P1B39

DTC P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C, P0B91, P0B96, P0B9B, P0BA0, P0BA5, P0BAA, P0BAF, P0BB4, P0BB9, P1B16, P1B19, P1B1C, P1B1F, P1B22, P1B25

All of the following conditions exist

  1. Average cell voltage movement is greater than 0.045 V
  2. DTC U182A is not set

DTC P0B3D, P0B3E, P0B42, P0B43, P0B47, P0B48, P0B4C, P0B4D, P0B51, P0B52, P0B56, P0B57, P0B5B, P0B5C, P0B60, P0B61, P0B65, P0B66, P0B6A, P0B6B, P0B6F, P0B70, P0B74, P0B75, P0B79, P0B7A, P0B7E, P0B7F, P0B83, P0B84, P0B88, P0B89, P0B8D, P0B8E, P0B92, P0B93, P0B97, P0B98, P0B9C, P0B9D, P0BA1, P0BA2, P0BA6, P0BA7, P0BAB, P0BAC, P0BB0, P0BB1, P0BB5, P0BB6, P0BBA, P0BBB, P1B17, P1B18, P1B1A, P1A1B, P1B1D, P1B1E, P1B20, P1B21, P1B23, P1B24, P1B26, P1B27

  1. 12 V battery voltage is greater than 9 V
  2. The battery energy control module is awake and communicating
  3. None of the following DTCs are set: P1B34, P1B35, P1B36, P1B37, P1B38, P1B39

P1B3D, P1B3E

  1. 12 V battery voltage is greater than 8.8 V
  2. None of the following DTCs are running: P1EAA, P1EAC
  3. None of the following DTCs are set: P1B34, P1B35, P1B36, P1B37, P1B38, P1B39

DTC P0B3B, P0B40, P0B45, P0B4A, P0B4F, P0B54, P0B59, P0B5E, P0B63, P0B68, P0B6D, P0B72, P0B77, P0B7C, P0B81, P0B86, P0B88, P0B90, P0B95, P0B9A, P0B9F, P0BA4, P0BA9, P0BAE, P0BB3, P0BB8, P1B28, P1B29, P1B2A, P1B2B, P1B2C, P1B2D

The appropriate battery voltage sense circuit is open

DTC P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C, P0B91, P0B96, P0B9B, P0BA0, P0BA5, P0BAA, P0BAF, P0BB4, P0BB9, P1B16, P1B19, P1B1C, P1B1F, P1B22, P1B25

Measured individial battery cell voltage movement is not in the same direction as the average battery cell voltage movement

P0B3D, P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88, P0B8D, P0B92, P0B97, P0B9C, P0BA1, P0BA6, P0BAB, P0BB0, P0BB5, P0BBA, P1B17, P1B1A, P1B1D, P1B20, P1B23, P1B26

Measured individual battery cell voltage is less than 1.4 V

P0B3E, P0B43, P0B48, P0B4D, P0B52, P0B57, P0B5C, P0B61, P0B66, P0B6B, P0B70, P0B75, P0B7A, P0B7F, P0B84, P0B89, P0B8E, P0B93, P0B98, P0B9D, P0BA2, P0BA7, P0BAC, P0BB1, P0BB6, P0BBB, P1B18, P1B1B, P1B1E, P1B21, P1B24, P1B27

Measured individual battery cell voltage is greater than 4.65 V

P1B3D

Cell sense voltage is less than 1.4 V

AND

Battery 16 cell voltage change is greater than 0.5 V over a 200ms sample time

P1B3E

Cell sense voltage is less than 1.4 V

AND

Battery 32 cell voltage change is greater than 0.5 V over a 200ms sample time

  1. DTC P0B3B-P0BBB, P1B16-1B2D, P1B3D, and P1B3E are type B DTCs
  2. The vehicle operates in a low battery mode with the high voltage contactors closed, but no hybrid functions will occur

DTC P0B3B-P0BBB, P1B16-1B2D, P1B3D, and P1B3E are type B DTCs

The following two tables should be used to determine the switch setting when using the EL-48571-30 High Voltage Battery Pin Out Box.

Battery Cells (1-16)
Connector X5
Switch DesignationSwitch PositionBattery Cell
A116
A215
A314
A413
A512
A611
B710
B89
B98
B107
B116
B125
C134
C143
C152
C161
Battery Cells (17-32)
Connector X4
Switch DesignationSwitch PositionBattery Cell
A132
A231
A330
A429
A528
A627
B726
B825
B924
B1023
B1122
B1221
C1320
C1419
C1518
C1617

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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-48571-30 High Voltage Battery Pin Out Box

EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

  1. Ignition ON.
  2. Verify that each of the scan tool Hybrid Battery Cell Voltage 1-32 parameters are between 3.0-4.1 V and all parameters are within 0.1 V of each other. If any parameter is not between 3.0-4.1 V or is not within 0.1 V of the others Refer to Circuit/System Testing. If all parameter are between 3.0-4.1 V and are within 0.1 V of each other
  3. All OK.
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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, disable high voltage at the A4 hybrid battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Disconnect the X1 and X2 harness connectors K16 battery energy control module.
  3. Connect the EL-48571-30 high voltage battery pin out box to the appropriate K16 battery energy control module harness connector.
  4. Insert the DMM probes into the EL-48571-30 test cavities.
  5. Measure and record the voltage of each of the cells by cycling the EL-48571-30 through each of the 16 switch positions.
  6. Verify that each cell voltage reading is 3.0-4.1 V and all cell voltage readings are within 0.1 V of each other. If any parameter is not between 3.0-4.1 V or is not within 0.1 V of the others Inspect the appropriate voltage signal circuit and low reference circuit for a short to ground or an open/high resistance. If a short to ground or an open/high resistance is found, replace the appropriate battery energy control module high voltage measuring harness. If a short to ground or an open/high resistance is not found Replace the C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2. If all parameter are between 3.0-4.1 V and are within 0.1 V of each other
  7. Replace the K16 battery energy control module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Generator Battery Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  2. «Battery Energy Control Module Wiring Harness Replacement (BDU, BECM and BPIM)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) , «Battery Energy Control Module Wiring Harness Replacement (HV Measuring Harness 1 and 2)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for battery energy control module replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid battery pack contains a total of 32 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 118 V DC. The battery cells are grouped together into two sections, each with 16 cell groups.

The battery energy control module monitors the voltage of the 32 battery cell groups. A voltage sense circuit is attached to each individual cell group. Each of these circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness connectors the voltage sense circuits to the battery energy control module, located directly above the hybrid battery pack.

None of the following DTCs are set: P0B3B, P0B3C, P0B3D, P0B3E, P0B40, P0B41, P0B42, P0B43, P0B45, P0B46, P0B47, P0B48, P0B4A, P0B4B, P0B4C, P0B4D, P0B4F, P0B50, P0B51, P0B52, P0B54, P0B55, P0B56, P0B57, P0B59, P0B5A, P0B5B, P0B5C, P0B5E, P0B5F, P0B60, P0B61, P0B63, P0B64, P0B65, P0B66, P0B68, P0B69, P0B6A, P0B6B, P0B6D, P0B6E, P0B6F, P0B70, P0B72, P0B73, P0B74, P0B75, P0B77, P0B78, P0B79, P0B7A, P0B7C, P0B7D, P0B7E, P0B7F, P0B81, P0B82, P0B83, P0B84, P0B86, P0B87, P0B88, P0B89, P0B8B, P0B8C, P0B8D, P0B8E, P0B90, P0B91, P0B92, P0B93, P0B95, P0B96, P0B97, P0B98, P0B9A, P0B9B, P0B9C, P0B9D, P0B9F, P0BA0, P0BA1, P0BA2, P0BA4, P0BA5, P0BA6, P0BA7, P0BA9, P0BAA, P0BAB, P0BAC, P0BAE, P0BAF, P0BB0, P0BB1, P0BB3, P0BB4, P0BB5, P0BB6, P0BB8, P0BB9, P0BBA, P0BBB, P1B16, P1B17, P1B18, P1B19, P1B1A, P1B1B, P1B1C, P1B1D, P1B1E, P1B1F, P1B20, P1B21, P1B22, P1B23, P1B24, P1B25, P1B26, P1B27, P1B28, P1B29, P1B2A, P1B2B, P1B2C, P1B2D

The maximum cell voltage and minimum cell voltage differ by more than 0.3 V.

  1. DTC P0BBE is a type B DTC
  2. The vehicle operates in a low battery mode with the high voltage contactors closed, but no hybrid functions will occur

DTC P0BBE is a type B DTC

The following two tables should be used to determine the switch setting when using the EL-48571-30 High Voltage Battery Pin Out Box.

Battery Cells (1-16)
Connector X5
Switch DesignationSwitch PositionBattery Cell
A116
A215
A314
A413
A512
A611
B710
B89
B98
B107
B116
B125
C134
C143
C152
C161
Battery Cells (17-32)
Connector X4
Switch DesignationSwitch PositionBattery Cell
A132
A231
A330
A429
A528
A627
B726
B825
B924
B1023
B1122
B1221
C1320
C1419
C1518
C1617

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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-48571-30 High Voltage Battery Pin Out Box

EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

  1. Ignition ON.
  2. Verify that each of the scan tool Hybrid Battery Cell Voltage 1-32 parameters are between 3.0-4.1 V and all parameters are within 0.1 V of each other. If any parameter is not between 3.0-4.1 V or is not within 0.1 V of the others Refer to Circuit/System Testing. If all parameter are between 3.0-4.1 V and are within 0.1 V of each other
  3. All OK.
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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, disable high voltage at the A4 hybrid battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling)
  2. Disconnect the X1 and X2 harness connectors K16 battery energy control module.
  3. Connect the EL-48571-30 high voltage battery pin out box to the appropriate K16 battery energy control module harness connector.
  4. Insert the DMM probes into the EL-48571-30 test cavities.
  5. Measure and record the voltage of each of the cells by cycling the EL-48571-30 through each of the 16 switch positions.
  6. Verify that each cell voltage reading is 3.0-4.1 V and all cell voltage readings are within 0.1 V of each other. If any parameter is not between 3.0-4.1 V or is not within 0.1 V of the others Inspect the appropriate voltage signal circuit and low reference circuit for a short to ground or an open/high resistance. If a short to ground or an open/high resistance is found, replace the appropriate battery energy control module high voltage measuring harness. If a short to ground or an open/high resistance is not found Replace the C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2. If all parameter are between 3.0-4.1 V and are within 0.1 V of each other
  7. Replace the K16 battery energy control module.
  1. «Generator Battery Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  2. «Battery Energy Control Module Wiring Harness Replacement (BDU, BECM and BPIM)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) , «Battery Energy Control Module Wiring Harness Replacement (HV Measuring Harness 1 and 2)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references)
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid battery system voltage is controlled by two high voltage contactors. The high voltage contactors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the hybrid battery pack assembly. Of the two contactors, one is a pre-charge contactor and the other is the primary contactor. The two contactors are closed in a specific sequence by the starter/generator control module. The pre-charge contactor is closed first. This causes high voltage to flow through the pre-charge resistor, allowing system voltage to build slowly. Once the system voltage has raised and stabilized, the primary contactor is closed. Both contactors are controlled by the starter/generator control module. The starter/generator control module supplies B+ to each contactor at all times. When the contactors are to be closed, the starter/generator control module will provide a ground to the contactor through a low side driver.

P0C77

  1. No faults are set against the battery current sensor
  2. No faults are set against the internal bus voltage sensor
  3. Bus voltage is less than 50% before the start of precharge

P0C78

  1. No faults are set against the battery current sensor
  2. No faults are set against the internal battery voltage sensor
  3. No faults are set against the internal bus voltage sensor

P0C77

Bus voltage is greater than 95% in less than 75 ms after the start of precharge

P0C78

Bus voltage has not reached 95% in less than 1 second after the start of precharge

OR

Battery current is greater than 5 A for longer than 100 ms after the start of precharge

DTCs P0C77 and P0C78 are type B DTCs

DTCs P0C77 and P0C78 are type B DTCs

Some conditions than may cause a too long pre-charge are

  1. Pre-charge contactor that is inoperative and does not close
  2. Excessive resistance in the closed contacts of the pre-charge contactor
  3. Excessive resistance in the pre-charge resistor
  4. An open or excessive resistance in any of the high voltage (orange) circuits or terminal supplying voltage to the pre-charge resistor and contactor

Some conditions than may cause a too short pre-charge are

  1. Primary contactor or pre-charge contractor stuck in the closed position
  2. Primary contactor control circuit shorted to ground, causing the primary contactor to remain closed even when not commanded closed by the starter/generator control module
  3. Too little resistance in the pre-charge resistor

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, disable high voltage at the A4 hybrid/EV battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Disconnect the X1 and X2 harness connectors at the KR134 pre-charge contactor.
  3. Connect the 12 V battery, ignition ON.
  4. Verify a test lamp illuminates between the B+ circuit terminal A X1 and ground. If the test lamp does not illuminate Ignition OFF, disconnect the harness connector at the K59 starter/generator control module. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K59 starter/generator control module. If the test lamp illuminates
  5. Test for less than 1 V between the control circuit terminal A X2 and ground. If 1 V or greater Ignition OFF, disconnect the X4 harness connector at the K59 starter/generator control module. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K59 starter/generator control module. If less than 1 V
  6. Install a 10 A fused jumper wire between the B+ terminal A X1 and 12 V. Install a jumper wire between the control terminal A X2 and ground.
  7. Test for less than 2 ohms between the high voltage terminals of the closed KR134 pre-charge contactor. If 2 ohms or greater Replace the KR134 pre-charge contactor. If less than 2 ohms
  8. Ignition OFF, connect the X1 and X2 harness connectors at the KR134 pre-charge contactor. Disconnect the X4 harness connector at the K59 starter/generator control module.
  9. Test for infinite resistance between the control circuit terminal 6 and ground. If less than infinite resistance Ignition OFF, disconnect the X2 harness connector at the KR134 pre-charge contactor Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, test or replace the KR134 pre-charge contactor. If infinite resistance
  10. Test for 20-40 ohms between the B+ circuit terminal 4 and the control circuit terminal 6. If not between 90-115 ohms Ignition OFF, disconnect the X2 harness connector at the KR134 pre-charge contactor. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the KR134 pre-charge contactor. If between 20-40 ohms
  11. Test for infinite resistance between the control circuit terminal 5 and ground. If less than infinite resistance Ignition OFF, disconnect the X1 harness connector at the KR38 main contactor. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, test or replace the KR38 main contactor. If infinite resistance
  12. Test for infinite resistance between the high voltage terminals of the open KR38 main contactor. If not infinite resistance Replace the KR38 main contactor. If infinite resistance
  13. Test for 5-10 ohms between the R25 hybrid/EV battery pre-charge resistor terminals. If not between 5-10 ohms Replace the R25 hybrid/EV battery pre-charge resistor. If between 5-10 ohms
  14. Test each of the high voltage circuits and terminals supplying the R25 hybrid/EV battery pre-charge resistor and KR134 pre-charge contactor for less than 2 ohms end to end. If 2 ohms or greater Replace the appropriate harness. If less than 2 ohms
  15. Replace the K59 starter/generator control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Generator Battery Control Wiring Harness Replacement (B2 to BDU1 Contactor)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) , «Generator Battery Control Wiring Harness Replacement (B1 and B2 to BECM Junction Block)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for starter/generator control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The battery energy control module performs various internal fault detection test to determine if a software or hardware concern exists within the module. No external circuits are involved.

P1A01, P1A05, P1A06

12 V battery voltage is greater than 8.8 V.

P1A5C

  1. Ignition ON
  2. 12 V battery voltage is greater than 8.8 V.

An internal fault is detected in the battery energy control module.

No action is taken.

No internal faults are detected in the battery energy control module.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition ON.
  2. Verify DTC P1A01, P1A05, P1A06, or P1A5C is not set. If any of the DTCs are set Replace the K16 battery energy control module If none of the DTCs are set
  3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for battery energy control module replacement, programming and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The battery energy control module is the interface and controller for the hybrid battery pack. The battery energy control module monitors and balances the cell voltages and also monitors the cell temperatures.

Battery energy control module is awake and communicating.

12 V battery voltage is less than 8.8 V.

  1. DTCs P1A0C is a type B DTC.
  2. 12 V battery voltage is greater than 8.8 V.

DTCs P1A0C is a type B DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition ON.
  2. Verify that DTC P1A0C is not set. If the DTC is set Test and inspect the 12 V battery. Refer to «Battery Inspection/Test»(/buick/regal/v-2009-2013/remont/charging-system/#battery-charging-system-and-starting-system-hybrid-hp6) . If the DTC is not set
  3. All OK.
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid battery pack has 6 battery temperature sensors. The battery temperature sensors are located on the top of the batteries. The temperature sensor is a variable resistor that measures the temperature of the battery cell group. The battery energy control module supplies 5 V to the signal circuit and a ground for the low reference circuit. The battery temperature sensor resistance changes with battery temperature. As the temperature decreases, the sensor resistance increases. As the temperature increases, the sesnor resistance decreases. The battery energy control module uses the battery temperature sensors to determine the temperature of the hybrid battery pack assembly. The hybrid powertrain control module will control the hybrid battery pack cooling fan based on the hybrid battery pack temperature.

  1. Battery voltage is greater than 8.8 V
  2. Battery energy control module is awake and communicating
  1. Temperature sensor 5 volt reference voltage is greater than 5.15 V
  2. Temperature sensor 5 volt reference voltage is less than 4.85 V

DTC P1A5D is a type A DTC

DTC P1A5D is a type A DTC

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition ON.
  2. Verify DTC P1A5D is not set. If the DTC is set Replace the K16 battery energy control module If the DTC is not set
  3. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for battery energy control module replacement, programming and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/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
IgnitionP1A5E, P0AC4, P2534P1A5E, P0AC4P1A5F, P0AC4, P2535

The RUN/CRANK relay applies ignition voltage to the ignition 1 circuit when the ignition is in the RUN or CRANK position. The ignition 1 circuit supplies ignition voltage to the starter/generator control module. The ignition 1 circuit also continues through the starter/generator control module in a pass-thru manner and continues to the battery energy control module. The battery energy control module also monitors the power mode message which is broadcast via serial data and compares the power mode message to the actual power mode as indicated by voltage on the ignition 1 circuit.

Controlled by the body control module (BCM), the accessory wakeup circuit supplies voltage to the starter/generator control module as a means to wake the control module and initiate serial data communications. Like the ignition 1 circuit, the accessory wakeup circuit continues through the starter/generator control module in a pass-thru manner and continues to the battery energy control module.

  1. 12 V battery voltage is greater than 8.86 V
  2. Battery energy control module is awake and communicating
  3. Serial data indicates the power mode is RUN/CRANK
  4. DTC U180B is not set

The power mode message received via serial data does not match the power mode indicated by the status of the ignition 1 circuit.

DTC P1A5E and P1A5F are type B DTCs

DTC P1A5E and P1A5F are type B DTCs

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

  1. Ignition ON.
  2. Verify the scan tool hybrid powertrain control module Ignition 1 parameter is 0 V with the ignition OFF and B+ with the ignition ON. If not 0 V with the ignition OFF and B+ with the ignition ON Refer to Circuit/System Testing. If 0 V with the ignition OFF and B+ with the ignition ON
  3. Verify the scan tool battery energy control module Power Mode parameter matches the actual vehicle power mode as the ignition is turned ON and OFF. If the parameter does not match the actual power mode Refer to Circuit/System Testing. If the parameter matches the actual power mode
  4. All OK.
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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, disconnect the X3 harness connector at the K59 starter/generator control module.
  2. Verify a test lamp does not illuminate between the ignition circuit terminal 10 and ground. If the test lamp illuminates Disconnect the X2 harness connector at the X50A fuse block - underhood. Test for less than 1 V between the ignition circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, refer to «Power Mode Mismatch»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures) . If the test lamp does not illuminate
  3. Ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 10 and ground. If the test lamp does not illuminate Disconnect the X2 harness connector at the X50A fuse block - underhood. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, refer to «Power Mode Mismatch»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures) . If the test lamp illuminates
  5. Connect the X3 harness connector at the K59 starter/generator control module.
  6. Ignition OFF, disable high voltage at the A4 hybrid/EV battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  7. Disconnect the X1 harness connector at the K16 battery energy control module.
  8. Connect the 12 V battery.
  9. Verify a test lamp does not illuminate between the ignition circuit terminal 9 and ground. If the test lamp illuminates Disconnect the X4 harness connector at the K59 starter/generator control module. Test for less than 1 V between the ignition circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K59 starter/generator control module. If the test lamp does not illuminate
  10. Ignition ON.
  11. Verify a test lamp illuminates between the ignition circuit terminal 9 and ground. If the test lamp does not illuminate Disconnect the X4 harness connector at the K59 starter/generator control module. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K59 starter/generator control module. If the test lamp illuminates
  12. Replace the K16 battery energy control module.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for battery energy control module or starter/generator control module replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/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
IgnitionP1A60P1A60

The RUN/CRANK relay applies ignition voltage to the ignition 1 circuit when the ignition is in the RUN or CRANK position. The ignition 1 circuit supplies ignition voltage to the starter/generator control module. The ignition 1 circuit also continues through the starter/generator control module in a pass-thru manner and continues to the battery energy control module. The battery energy control module also monitors the power mode message which is broadcast via serial data and compares the power mode message to the actual power mode as indicated by voltage on the ignition 1 circuit.

Controlled by the body control module (BCM), the accessory wakeup circuit supplies voltage to the starter/generator control module as a means to wake the control module and initiate serial data communications. Like the ignition 1 circuit, the accessory wakeup circuit continues through the starter/generator control module in a pass-thru manner and continues to the battery energy control module.

  1. Battery voltage is greater tan 9.6 V
  2. Battery energy control module is awake and communicating
  3. Serial data indicates the power mode is RUN/CRANK
  4. Propulsion system is active

The accessory wakeup serial data circuit is not active

DTC P1A60 is a type B DTC

DTC P1A60 is a type B DTC

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

  1. Ignition ON.
  2. Verify DTC U2099 is not set. If the DTC is set Refer to «DTC U2099»(/buick/regal/v-2009-2013/remont/communication-devices/#data-communications-system) . If the DTC is not set
  3. Refer to Circuit/System Testing
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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, disable high voltage at the A4 hybrid/EV battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Disconnect the X1 harness connector at the K16 battery energy control module.
  3. Connect the 12 V battery, ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 20 and ground. If the test lamp does not illuminate Ignition OFF, disconnect the X4 harness connector at the K59 starter/generator control module. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K59 starter/generator control module. If the test lamp illuminates
  5. Replace the K16 battery energy control module.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for battery energy control module or starter/generator control module replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The vehicle is equipped with a high voltage isolation monitor feature. The purpose of the isolation monitor is to test the resistance between the high voltage positive and negative direct current (DC) bus and chassis ground. The isolation monitoring system measures the resistance between the high voltage system and chassis ground in the following way. The isolation monitoring system measures voltage potential difference between the positive battery mid pack voltage and chassis ground as well as the voltage difference between negative battery mid pack voltage and chassis ground. These voltage values are used by the starter/generator control module to calculate a resistance value between the high voltage bus and the chassis ground. If this resistance value is too low, a high voltage isolation fault has occurred.

This DTC runs at all times

The starter/generator control module detects an AC voltage short to chassis ground.

  1. DTC P1B11 is a type A DTC
  2. If the DTC sets while there is a loss of communication with the sensing and diagnostic module (SDM), the starter/generator control module will record the fault as a crash event and the DTC will become latched.
  1. DTC P1B11 is a type A DTC
  2. If the DTC is set as a latched DTC, the crash event must be cleared before the DTC will clear.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

EL-50772 Insulation Multimeter

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, disable high voltage at the A4 hybrid/EV battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Disconnect the U, V, and W three phase lugs at the K59 starter/generator control module.
  3. Test for greater than 400K ohms between the terminals listed below and chassis ground with the EL-50772 Insulation Multimeter set on the Isolation test setting: 3 phase cable terminal U - cable side lug 3 phase cable terminal V - cable side lug 3 phase cable terminal W - cable side lug If 400K ohms or less Disconnect the U, V, and W three phase lugs at the A15 starter/generator. Test for greater than U, V, and W three phase studs at the A15 starter/generator and chassis ground with the EL-50772 Insulation Multimeter set on the Isolation test setting. If 400K ohms or less, replace the A15 starter/generator. If greater than 400K ohms Replace the high voltage 3 phase cables. If greater than 400K ohms
  4. Test for greater than 400K ohms between the terminals listed below and chassis ground with the EL-50772 Insulation Multimeter set on the Isolation test setting: 3 phase terminal U - K59 starter/generator control module stud 3 phase terminal V - K59 starter/generator control module stud 3 phase terminal W - K59 starter/generator control module stud If 400K ohms or less Disconnect and remove the two wiring junction blocks from the A4 hybrid/EV battery pack. Test for greater than U, V, and W three phase studs at the K59 starter/generator control module and chassis ground with the EL-50772 Insulation Multimeter set on the Isolation test setting. If 400K ohms or less, replace the K59 starter/generator control module. If greater than 400K ohms Replace the two wiring junction blocks. If greater than 400K ohms
  5. Replace the C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Drive Motor Generator Battery Cable Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  2. «Starter Generator Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-control-system)
  3. «Generator Battery Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  4. «Drive Motor Battery Wire Junction Block Relay Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  5. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for starter/generator control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid battery pack contains a total of 32 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 118 V DC. The battery cells are grouped together into two sections, each with 16 cell groups.

The battery energy control module monitors the voltage of the 32 battery cell groups. A voltage sense circuit is attached to each individual cell group. Each of these circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness connectors the voltage sense circuits to the battery energy control module, located directly above the hybrid battery pack.

To ensure proper battery function and lengthen battery life, the battery energy control module balances the voltage of the cells so that each cells maintains the same voltage level. The battery energy control module uses internal voltage gates to transfer voltage from cells with a higher voltage level to those cells with a lower voltage level. To maintain a similar state of charge on the cell groups, the starter/generator control module monitors the cell voltages and determines which cells need energy removed in order to maintain the cells at a similar state of charge. A resistor wired in parallel with the cell and a transistor switch in series with the resistor internal to the battery energy control module. The starter/generator control module sends a command to the battery energy control module to begin cell balancing.

DTC P1B33

  1. Battery voltage is greater than 8.8 V.
  2. Battery energy control module is awake and communicating.
  3. Internal cell balancing is not in progress.

DTC P1B34, P1B35, P1B36, P1B37, P1B38, P1B39

  1. Battery voltage is greater than 9.6 V.
  2. Battery energy control module is awake and communicating.

DTC P1B33

The balancing switch status does not equal the balancing switch command.

DTC P1B34, P1B35, P1B36, P1B37, P1B38, P1B39

An internal communication fault has occurred within the battery energy control module.

  1. DTCs P1B33, P1B34, P1B35, P1B36, P1B37, P1B38, and P1B39 are type B DTCs.
  2. The vehicle operates in a low battery mode with the high voltage contactors closed, but no hybrid functions will occur.

DTCs P1B33, P1B34, P1B35, P1B36, P1B37, P1B38, and P1B39 are type B DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Verify there are no customer installed devices located near the A4 hybrid/EV battery pack and that any customer installed antenna or antenna cables are routed away from the A4 hybrid/EV battery pack. If any customer installed devices, antenna, or antenna cables are located near the A4 hybrid/EV battery pack Remove or relocated the devices, antenna, or antenna cables. If no customer installed devices, antenna, or antenna cables are located near the A4 hybrid/EV battery pack
  2. Ignition ON.
  3. Verify DTC P1B33, P1B34, P1B35, P1B36, P1B37, P1B38, or P1B39 is not set. If any of the DTCs are set Replace the K16 battery energy control module If none of the DTCs are set
  4. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for battery energy control module replacement, programming and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/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 ReferenceP0641, P057C, P1B3FP1B3FP0641, P1B40
SignalP1B3FP1B3FP1B40

The high voltage interlock circuits are utilized to verify high voltage component integrity. The high voltage interlock circuits are two circuit loops that passes through certain high voltage components. The high voltage interlock circuits are used to determine if access to high voltage components is being attempted. The opening of these high voltage components causes high voltage interlock circuit to open. The starter/generator control module monitors both the high voltage interlock 5 V reference circuit voltage and the high voltage interlock signal circuit voltage in order to detect circuit faults. When the starter/generator control module detects a loss of high voltage interlock circuit voltage, the high voltage contactors are commanded open.

The service cover for the starter/generator and the service cover for the hybrid/EV battery pack each contain a high voltage interlock switch. When either cover is removed, the stater/generator control module will respond by opening the high voltage contacts. The 5 V reference circuits and signal circuits for each of the two high voltage interlock loops are completely separate from one another and are monitored as two separate loops, with each setting a specific DTC to indicate a circuit fault. The 5 V reference circuit that feeds the high voltage interlock switch on the starter/generator also supplies the 5 V reference to the brake pedal position sensor.

The starter/generator control module is awake and communicating

DTC P1B3F

Voltage on the high voltage interlock signal circuit is less than 0.5 V

DTC P1B40

Voltage on the high voltage interlock signal circuit is grater than 4.5 V

DTCs P1B3F and P1B40 are type B DTCs

DTCs P1B3F and P1B40 are type B DTCs

  1. When a circuit fault is detected on the high voltage interlock loop that feeds the starter/generator and the vehicle hood is opened, the starter/generator control module will respond by turning off inverter switching. This will prevent the starter/generator from charging the hybrid/EV battery pack and supplying voltage to the starter/generator control module 12 V output. Operating in this manner will cause an eventual discharge of both the high voltage battery pack and the 12 V battery.
  2. Because the 5 V reference circuit also supplies voltage to the brake pedal position sensor, a circuit fault on the high voltage interlock loop that feeds the starter/generator will also cause hybrid functions that rely on the brake pedal position, such as auto-stop and regenerative braking, to be disabled.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

  1. Ignition ON.
  2. Verify DTC P0641 is not set. If the DTC is set Refer to «DTC P0641»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) . If the DTC is not set
  3. Refer to Circuit/System Testing.
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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, disconnect the X1 harness connector at the A15 starter/generator, ignition ON.
  2. Test for 4.8-5.2 V between the 5 V reference circuit terminal 12 and ground. If not between 4.8-5.2 V Ignition OFF, disconnect the X2 harness connector at the K59 starter/generator control module. Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K59 starter/generator control module. If between 4.8-5.2 V
  3. Verify DTC P1B40 is not set. If the DTC is set Ignition OFF, disconnect the X2 harness connector at the K59 starter/generator control module. Test for less than 1 V between the signal circuit terminal 11 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K59 starter/generator control module. If the DTC is not set
  4. Ignition OFF, connect a 3 A fused jumper wire between the 5 V reference circuit terminal 12 and the signal circuit terminal 11, ignition ON.
  5. Verify DTC P1B3F is not set. If the DTC is set Ignition OFF, disconnect the X2 harness connector at the K59 starter/generator control module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K59 starter/generator control module. If the DTC is not set
  6. Test or replace the A15 starter/generator.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Starter Generator Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-control-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for starter/generator control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The vehicle is equipped with a high voltage isolation monitor feature. The purpose of the isolation monitor is to test the resistance between the high voltage positive and negative direct current (DC) bus and chassis ground. The isolation monitoring system measures the resistance between the high voltage system and chassis ground in the following way. The isolation monitoring system measures voltage potential difference between the positive battery mid pack voltage and chassis ground as well as the voltage difference between negative battery mid pack voltage and chassis ground. These voltage values are used by the starter/generator control module to calculate a resistance value between the high voltage bus and the chassis ground. If this resistance value is too low, a high voltage isolation fault has occurred.

P1E0C

  1. Power mode is RUN or CRANK.
  2. Contactors are closed.

P1E0D

  1. Power mode is RUN or CRANK.
  2. The starter/generator control module internal voltage sensor has no reported faults.

P1E0C

Voltage measured at the negative mid-pack voltage sensor is less than 5 V.

P1E0D

The difference between the voltage measured at the negative mid-pack voltage sensor and the starter/generator control module internal motor control processor high voltage value is greater than 15 V.

  1. DTCs P1E0C and P1E0D are type B DTCs.
  2. If the DTC sets while there is a loss of communication with the sensing and diagnostic module (SDM), the starter/generator control module will record the fault as a crash event and the DTC will become latched.
  1. DTCs P1E0C and P1E0D are type B DTCs.
  2. If the DTC is set as a latched DTC, the crash event must be cleared before the DTC will clear.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition ON.
  2. Verify DTC P1E0C or P1E0D is not set. If either of the DTCs are set Replace the K59 starter/generator control module. If none of the DTCs are set
  3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for starter/generator control module replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The vehicle is equipped with a high voltage isolation monitor feature. The purpose of the isolation monitor is to test the resistance between the high voltage positive and negative direct current (DC) bus and chassis ground. The isolation monitoring system measures the resistance between the high voltage system and chassis ground in the following way. The isolation monitoring system measures voltage potential difference between the positive battery mid pack voltage and chassis ground as well as the voltage difference between negative battery mid pack voltage and chassis ground. These voltage values are used by the starter/generator control module to calculate a resistance value between the high voltage bus and the chassis ground. If this resistance value is too low, a high voltage isolation fault has occurred.

P1E0F

  1. Power mode is RUN or CRANK.
  2. Contactors are closed.

P1E10

  1. Power mode is RUN or CRANK.
  2. The starter/generator control module internal voltage sensor has no reported faults.
  3. Mid-pack voltage positive sensor is less than 7.5 V.
  4. DTC P0AAA is not set.

P1E11

  1. Mid-pack voltage positive sensor is less than 7.5 V.
  2. DTC P1E0F or P1E10 is not set.

P1E0F

Voltage measured at the positive mid-pack high resolution voltage sensor is less than 3 V.

P1E10

The difference between the voltage measured at the positive mid-pack high resolution voltage sensor and the starter/generator control module internal motor control processor high voltage value is greater than 5 V.

P1E11

The difference between the mid-pack voltage positive sensor and m the positive mid-pack high resolution voltage sensor is greater than 3 V.

  1. DTCs P1E0F-P1E11 are type B DTCs.
  2. If the DTC sets while there is a loss of communication with the sensing and diagnostic module (SDM), the starter/generator control module will record the fault as a crash event and the DTC will become latched.
  1. DTCs P1E0F-P1E11 are type B DTCs.
  2. If the DTC is set as a latched DTC, the crash event must be cleared before the DTC will clear.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition ON.
  2. Verify DTC P1E0F, P1E10, or P1E11 is not set. If any of the DTCs are set Replace the K59 starter/generator control module. If none of the DTCs are set
  3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for starter/generator control module replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The vehicle is equipped with a high voltage isolation monitor feature. The purpose of the isolation monitor is to test the resistance between the high voltage positive and negative direct current (DC) bus and chassis ground. The isolation monitoring system measures the resistance between the high voltage system and chassis ground in the following way. The isolation monitoring system measures voltage potential difference between the positive battery mid pack voltage and chassis ground as well as the voltage difference between negative battery mid pack voltage and chassis ground. These voltage values are used by the starter/generator control module to calculate a resistance value between the high voltage bus and the chassis ground. If this resistance value is too low, a high voltage isolation fault has occurred.

P1E12

Contactors are closed.

P1E13

  1. Power mode is RUN or CRANK.
  2. The starter/generator control module internal voltage sensor has no reported faults.
  3. Mid-pack voltage negative sensor is less than 7.5 V.
  4. DTC P1E0D is not set.

P1E14

  1. Mid-pack voltage negative sensor is less than 7.5 V.
  2. DTC P1E10 or P1E11 is not set.

P1E12

Voltage measured at the negative mid-pack high resolution voltage sensor is less than 3 V.

P1E13

The difference between the voltage measured at the negative mid-pack high resolution voltage sensor and the starter/generator control module internal motor control processor high voltage value is greater than 5 V.

P1E14

The difference between the mid-pack voltage negative sensor and m the negative mid-pack high resolution voltage sensor is greater than 3 V.

  1. DTCs P1E12-P1E14 are type B DTCs.
  2. If the DTC sets while there is a loss of communication with the sensing and diagnostic module (SDM), the starter/generator control module will record the fault as a crash event and the DTC will become latched.
  1. DTCs P1E12-P1E14 are type B DTCs.
  2. If the DTC is set as a latched DTC, the crash event must be cleared before the DTC will clear.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition ON.
  2. Verify DTC P1E12, P1E13, or P1E14 is not set. If any of the DTCs are set Replace the K59 starter/generator control module. If none of the DTCs are set
  3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for starter/generator control module replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

As a means of checking microprocessor integrity, the starter/generator control module calculates and compares voltage at various locations within itself. The starter/generator control module calculates three separate voltage values, representing voltage measured at different locations within the hybrid battery pack. The starter/generator control module preforms these calculations at different locations within the microprocessor. As an indicator of microprocessor integrity, the voltage calculations should all be the same.

This DTC runs continuously.

The difference between the calculated voltages is greater than 1 V.

  1. DTC P1E3D is a type A DTC.
  2. The high voltage contactors open and hybrid functions are disabled.
  3. 12 V output from the starter/generator control module is maintained.

DTC P1E3D is a type A DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition ON.
  2. Verify DTC P1E3D is not set. If the DTC is set Replace the K59 starter/generator control module. If the DTC is not set
  3. All OK

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for starter/generator control module replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid battery pack contains a total of 32 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 118 V DC. The battery cells are grouped together into two sections, each with 16 cell groups.

The battery energy control module monitors the voltage of the 32 battery cell groups. A voltage sense circuit is attached to each individual cell group. Each of these circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness connectors the voltage sense circuits to the battery energy control module, located directly above the hybrid battery pack.

To ensure proper battery function and lengthen battery life, the battery energy control processor balances the voltage of the cells so that each cells maintains the same voltage level. The battery energy control module uses internal voltage gates to transfer voltage from cells with a higher voltage level to those cells with a lower voltage level. This voltage balancing is an internal function to the battery energy control module.

The cell voltages are read through multiplexer circuits which take the voltages from multiple battery cells and supplies them to one single analog to digital converter. To determine if the multiplexer is operating correctly, the balancing gates are operated by the battery energy control module one at a time, shifting each cell voltage while the balance gate is on. This cell voltage pattern is analyzed by the starter/generator control module to determine if there is a cell voltage multiplexer malfunction.

  1. Ignition mode transitions from RUN or CRANK to OFF.
  2. Contactor status is open.
  3. Propulsion system active while contactors are open for greater than 2.5 seconds is not true.
  4. DTC U182A is not set.
  1. The balance process did not occur at ignition OFF.
  2. The balance process occurred at any time other than ignition OFF.
  3. The cell voltage movement during the balance process is more than 0.1 V from the expected voltage movement.
  1. DTC P1EAA is a type A DTC.
  2. The vehicle operates in a low battery mode with the high voltage contactors closed, but no hybrid functions will occur.

DTC P1EAA is a type A DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Verify no communication DTCs are set in the K59 starter/generator control module. If any communication DTCs are set in the K59 starter/generator control module Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If no communication DTCs are set in the K59 starter/generator control module
  2. Verify DTC P1A5E or P1A5F are not set. If DTC P1A5E or P1A5F is set Refer to «DTC P1A5E or P1A5F»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) . If DTC P1A5E and P1A5F are not set
  3. Verify DTC P1A60 is not set. If DTC P1A60 is set Refer to «DTC P1A60»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) . If DTC P1A60 is not set
  4. Verify DTC P1EAA or P1EAC is not set as current. If DTC P1EAA or P1EAC is set as current Replace the K16 battery energy control module. NOTE: DTC P1EAA or P1EAC may be difficult to reproduce and no repair should be made unless the DTC is set as current. Operate the vehicle within the Conditions for Running the DTC when attempting to reproduce the DTC. If DTC P1EAA or P1EAC is not set or is set as history
  5. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for battery energy control module replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The hybrid battery pack contains a total of 32 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 118 V DC. The battery cells are grouped together into two sections, each with 16 cell groups.

The battery energy control module monitors the voltage of the 32 battery cell groups. A voltage sense circuit is attached to each individual cell group. Each of these circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness connectors the voltage sense circuits to the battery energy control module, located directly above the hybrid battery pack.

The battery energy control module also monitors the cell voltage with internal hardware that is independent from the normal cell voltage path. This alternate method produces a true and false signal that indicates whether or not any cell voltage is too high. This signal is encoded and transmitted via serial data to the starter/generator control module.

The DTC monitor runs at all times, except when the control module self test is running or DTC P1EAC or U182A is set.

Battery cell voltage is greater than 4.35 V

  1. DTC P1EABA is a type A DTC
  2. The vehicle operates in a low battery mode with the high voltage contactors closed, but no hybrid functions will occur
  1. DTC P1EAB is a type A DTC
  2. DTC P1EAB is a secure DTC. The «Clear Secured High Voltage DTCs»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) procedure must be performed to prevent resetting the DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition ON.
  2. Verify DTC P1B34, P1B35, P1B36, P1B37, P1B38, or P1B39 is not set. If any of the DTCs are set Refer to «DTC P1B33-P1B39»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) . After the repair is complete, the «Clear Secured High Voltage DTCs»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) procedure must be performed to clear the secured DTC P1EAB. If none of the DTCs are set
  3. Verify DTC P0B3B-P0BBB or P1B16-P1B2D is not set. If any of the DTCs are set Refer to «DTC P0B3B-P0BBB, P1B16-P1B2D, P1B3D, or P1B3E»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) . After the repair is complete, the «Clear Secured High Voltage DTCs»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) procedure must be performed to clear the secured DTC P1EAB. If none of the DTCs are set
  4. Verify DTC P1EAB is not set. If the DTC is set Replace the C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2. After the repair is complete, the «Clear Secured High Voltage DTCs»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) procedure must be performed to clear the secured DTC P1EAB. If the DTC is not set
  5. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The 2nd protection is a redundant method to monitor cell group overvoltage. The battery energy control modules independently reads and tests each cell group and communicates this to the hybrid powertrain control module. The hybrid powertrain control module diagnoses this message to determine when a cell group overvoltage condition exists.

The battery energy control module diagnoses the function of the redundant monitor, once, every power down cycle. When run/crank input signal transitions low and after a calibrated delay, the battery energy control module informs the hybrid powertrain control module, via serial data, that it is about to run the diagnostics on the 2nd protection circuit. The battery energy control module then proceeds to run the check on the serial data cell overvoltage true or false message. If any pulses are missing from the serial data message, the starter/generator control module will report this as a fault.

  1. Ignition mode transitions from RUN or CRANK to OFF
  2. 2nd protection fault test bit is active
  3. No faults are set that would cause the contactors to become open when propulsion is active
  4. DTC U182A is not set

The test active bit is active for 12 seconds

OR

The test active bit does not transition to active

OR

The enumerated results does not match the expected result or not enough "True" responses are received

  1. DTC P1EAC is a type A DTC
  2. The vehicle operates in a low battery mode with the high voltage contactors closed, but no hybrid functions will occur

DTC P1EAC is a type A DTC

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Verify no communication DTCs are set in the K59 starter/generator control module. If any communication DTCs are set in the K59 starter/generator control module Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If no communication DTCs are set in the K59 starter/generator control module
  2. Verify DTC P1A5E or P1A5F are not set. If DTC P1A5E or P1A5F is set Refer to «DTC P1A5E or P1A5F»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) . If DTC P1A5E and P1A5F are not set
  3. Verify DTC P1A60 is not set. If DTC P1A60 is set Refer to «DTC P1A60»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) . If DTC P1A60 is not set
  4. Verify DTC P1EAA or P1EAC is not set as current. If DTC P1EAA or P1EAC is set as current Replace the K16 battery energy control module. NOTE: DTC P1EAA or P1EAC may be difficult to reproduce and no repair should be made unless the DTC is set as current. Operate the vehicle within the Conditions for Running the DTC when attempting to reproduce the DTC. If DTC P1EAA or P1EAC is not set or is set as history
  5. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for battery energy control module replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The vehicle is equipped with a high voltage isolation monitor feature. The purpose of the isolation monitor is to test the resistance between the high voltage positive and negative direct current (DC) bus and chassis ground. The isolation monitoring system measures the resistance between the high voltage system and chassis ground.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

EL-50772 Insulation Multimeter

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, disable high voltage at the A4 hybrid/EV battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling)
  2. Disconnect the U, V, and W three phase lugs at the K59 starter/generator control module.
  3. Test for greater than 400K ohms between the terminals listed below and chassis ground with the EL-50772 Insulation Multimeter set on the Isolation test setting: 3 phase cable terminal U - cable side lug 3 phase cable terminal V - cable side lug 3 phase cable terminal W - cable side lug If 400K ohms or less Disconnect the U, V, and W three phase lugs at the A15 starter/generator. Test for greater than U, V, and W three phase studs at the A15 starter/generator and chassis ground with the EL-50772 Insulation Multimeter set on the Isolation test setting. If 400K ohms or less, replace the A15 starter/generator. If greater than 400K ohms Replace the high voltage 3 phase cables. If greater than 400K ohms
  4. Test for greater than 400K ohms between the terminals listed below and chassis ground with the EL-50772 Insulation Multimeter set on the Isolation test setting: 3 phase terminal U - K59 starter/generator control module stud 3 phase terminal V - K59 starter/generator control module stud 3 phase terminal W - K59 starter/generator control module stud If 400K ohms or less Disconnect and remove the two wiring junction blocks from the A4 hybrid/EV battery pack. Test for greater than U, V, and W three phase studs at the K59 starter/generator control module and chassis ground with the EL-50772 Insulation Multimeter set on the Isolation test setting. If 400K ohms or less, replace the K59 starter/generator control module. If greater than 400K ohms Replace the two wiring junction blocks. If greater than 400K ohms
  5. Replace the C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Drive Motor Generator Battery Cable Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  2. «Starter Generator Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-control-system)
  3. «Generator Battery Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  4. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for hybrid powertrain control module replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

At times, it may be necessary to disconnect high voltage from the vehicle, both during normal operation and when a system fault is identified. The starter/generator control module controls the main contactor and pre-charge contactor to disconnect and connect high voltage from the vehicle. The high voltage contactors are switches that are controlled much like a relay. To disable high voltage from the vehicle, the main and pre-charge contactors are commanded open. This will open the contactors and physically disconnect the hybrid/EV battery positive cable. To connect high voltage to the vehicle, first the pre-charge contactor is closed. With the pre-charge contactor closed, current flows through the pre-charge resistor. This allows high voltage to slowly build in the system, as the resistor decreases current flow. Once high voltage is brought up though the pre-charge contactor, the main contactor is close and high voltage is active. If the high voltage builds too quickly or too slowly, the starter/generator control module will set a fault.

Is a system fault occurs that does not allow the contactors to open, the starter/generator control module will be unable to disconnect high voltage from the vehicle. In instances such as this, the manual disconnect lever will disconnect high voltage from the vehicle when servicing.

  1. This diagnostic is used when high voltage has not been disabled after following the High Voltage Disabling procedure. This indicates that one or both contactors are stuck closed and the manual service disconnect is also stuck closed. The High Voltage Disabling procedure should still be completed, using the procedure for Servicing Any Internal Components Within the A4 Hybrid/EV Battery Pack. This will disconnect the battery terminals at the C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2 and limit high voltage exposure when performing diagnosis.
  2. Be sure to check for any DTCs that may be set. These DTCs may lead to the cause of the stuck contactors and DTC diagnosis should be performed before enabling high voltage. This will help ensure a repeat fault with the contactors does not occur. After diagnosis any DTCs, return to this procedure to test and repair any contactor that may be mechanically stuck closed.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/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

For equivalent regional tools, refer to Special Tools .

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, disable high voltage at the A4 hybrid/EV battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Verify no high voltage system DTCs are set. If any high voltage system DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If no high voltage system DTCs are set
  3. Test for infinite resistance between the high voltage terminals at the KR39 main contactor. If not infinite resistance The KR39 main contactor is stuck in the closed position. Replace the KR39 main contactor. If infinite resistance
  4. Test for infinite resistance between the high voltage terminals at the KR134 pre-charge contactor. If not infinite resistance The KR134 pre-charge contactor is stuck in the closed position. Replace the KR134 pre-charge contactor. If infinite resistance
  5. Test for infinite resistance between the high voltage terminals at the S15 hybrid/EV battery pack high voltage manual disconnect lever. If not infinite resistance The S15 hybrid/EV battery pack high voltage manual disconnect lever is stuck in the closed position. Replace the S15 hybrid/EV battery pack high voltage manual disconnect lever. If infinite resistance
  6. Replace the K59 starter/generator control module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Generator Battery Control Wiring Harness Replacement (B2 to BDU1 Contactor)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) , «Generator Battery Control Wiring Harness Replacement (B1 and B2 to BECM Junction Block)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for starter/generator control module replacement, programming, and setup

High Voltage System Inspection

A complete inspection of the high voltage system and components must be performed if the vehicle has been involved in a collision.

Vehicle Collision Detection

The Supplemental Inflatable Restraint (SIR) sensors are designed to identify the severity of a collision and from what direction a collision has occurred. The SIR sensors typically detect collision conditions for occupant impact-protection reasons. The starter/generator control module will open the high voltage contactor relays and disable the vehicle whenever an SIR deployment occurs.

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

The Crash Event Detected condition will remain active until cleared by the starter/generator control module Clear Secured High Voltage DTCs output control function of the scan tool.

Special Tools

EL-48900 HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

Inspection Procedure

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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGHigh voltage circuits should only be tested using a digital multimeter (DMM) and test leads with at least a CAT III rating, such as the J 39200-A Digital Multimeter. Failure to follow the procedures exactly as written may result in serious injury or death.
WARNINGThe eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.
  1. Ignition OFF, perform a visual inspection of the following high voltage components listed. Remove any trim covers, carpet, or shields to gain access. DO NOT remove the metal A4 hybrid/EV battery pack cover. Inspect the assembly and verify there are no case cracks, dents, pinched, cut or frayed high voltage cables, low voltage cables, or other physical damage. A4 hybrid/EV battery pack A15 starter/generator G14 hybrid/EV battery pack cooling fan G14 hybrid/EV battery pack cooling fan inlet and outlet ducts for proper positioning to the A4 hybrid/EV battery pack. Refer to «Drive Motor Battery Cooling Air Inlet Upper Duct Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-cooling-system) ,, «Drive Motor Battery Cooling Blower Outlet Duct Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-cooling-system) ,, and «Drive Motor Battery Cooling Air Outlet Duct Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-cooling-system) for proper duct installation and routing. High voltage cables between the K59 starter/generator control module and the A15 starter/generator If any damage is found Ignition OFF, disable high voltage at the A4 hybrid/EV battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) . If vehicle damage does not allow for access to the S15 hybrid/EV battery pack high voltage manual disconnect lever, disconnect the 12V battery and remove the damaged portion of the vehicle until the S15 hybrid/EV battery pack high voltage manual disconnect lever can be accessed and the «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) procedure can be completed. Replace any components and cables that have been identified as damaged. Continue to step 2 after repairs have been completed. If no damage is found
  2. Enable high voltage at the A4 hybrid/EV battery pack. Refer to «High Voltage Enabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-enabling) .
  3. Ignition ON.
  4. Verify no DTCs are set. If any DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If no DTCs are set
  5. Clear the Crash Event Detected disable condition after all damaged high voltage components have been replaced. Refer to «Clear Secured High Voltage DTCs»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__clear-secured-high-voltage-dtcs) .
  6. Perform the required body repairs using the approved service procedures.

Removal Procedure

  1. Disable the hybrid battery. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Disconnect the following connectors, in the above graphic sequence shown, from the battery energy control module wiring junction block.
  3. Remove the connectors (1) and the connector (2).
  4. Remove the from the battery energy control module fasteners (1) and remove the from the battery energy control module (2) from the mounting studs.

Installation Procedure

  1. Install the from the battery energy control module (2) to the mounting studs and tighten the fasteners (1) to 9 N.m (80 lb in).
  2. Install the connectors (1) and connector (2).
  3. Connect the remaining connectors in the above graphic sequence.
  4. Enable the hybrid battery. Refer to «High Voltage Enabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-enabling) .
  5. Program the battery energy control module. Refer to «Battery Energy Control Module Programming and Setup»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__battery-energy-control-module-programming-and) .

Special Tools

  1. EL-48264 Battery Pack Lifting Adapter
  2. EL-48900 High Voltage Safety Kit

For equivalent regional tools, refer to Special Tools .

  1. Remove the rear compartment floor panel. Refer to «Rear Compartment Floor Panel Trim Replacement (with Battery Cover, HP6)»(/buick/regal/v-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) , «Rear Compartment Floor Panel Trim Replacement (with Blower Cover, HP6)»(/buick/regal/v-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  2. Ignition OFF, disable high voltage at the A4 hybrid battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  3. Remove the rear end trim finish panel. Refer to «Rear End Trim Finish Panel Replacement»(/buick/regal/v-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  4. Remove the body harness connectors (1) from the generator control and battery module.
  5. Remove the high voltage 3-phase cable terminal nuts (1) and the 12V terminal branch nut (4).
  6. Remove the high voltage cable (2) and the 12V cable (3) from the generator control and battery module.
  7. Remove the drive motor battery generator intermediate cooling duct fasteners (1).
  8. Detach the intermediate duct retainers (1) from the generator control and battery module.
  9. Detach the drive motor battery cooling air inlet lower duct retainers (1), by pulling outwards and then upwards. Refer to «Drive Motor Battery Cooling Air Inlet Upper Duct Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-cooling-system) .
  10. Remove the generator control and battery module vent tube (1).
  11. Remove the generator control and battery module mounting bolts (1).
  12. Place a protective cloth over the trunk-to-rear bumper area.
  13. With assistance, use gloves to slide the generator control and battery module (1) into the trunk area.
  14. Using the EL-48264 Battery Pack Lifting Adapter center the eye bolt (2) on the generator control and battery module and insert the hooks (1) into the generator control and battery module holes.
  15. Attach a portable lift to the center eye bolt (2) of the battery pack lifting adapter.
  16. Remove the generator control and battery module (2) from the rear trunk area.
  1. Install the generator control and battery module (2) in through the trunk opening.
  2. Slide the generator control and battery module into position and install the vent tube (1) into the floor.
  3. Remove the EL-48264 Battery Pack Lifting Adapter.
  4. Install the generator control and battery module into position and tighten the mounting bolts (1) to 22 N.m (16 lb ft).
  5. Install the body harness connectors (1).
  6. Install the drive motor battery cooling air inlet lower duct retainers (1).
  7. Install the intermediate duct retainers (1) to the generator control and battery module.
  8. Install the drive motor battery cooling blower. Refer to «Drive Motor Generator Battery Bracket Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-cooling-system) .
  9. Install the high voltage 3-phase cable (2) to the generator control and battery module. Tighten the nuts (1) to 9 N.m (80 lb in).
  10. Install the 12V cable (3) to the generator control and battery module. Tighten the nut (4) to 9 N.m (80 lb in).
  11. Install the rear compartment floor panel. Refer to «Rear Compartment Floor Panel Trim Replacement (with Battery Cover, HP6)»(/buick/regal/v-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) , «Rear Compartment Floor Panel Trim Replacement (with Blower Cover, HP6)»(/buick/regal/v-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  12. Install the rear end trim finish panel. Refer to «Rear End Trim Finish Panel Replacement»(/buick/regal/v-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  13. Remove the rear end trim finish panel. Refer to «Rear End Trim Finish Panel Replacement»(/buick/regal/v-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  14. Enable the high voltage battery. Refer to «High Voltage Enabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-enabling) .
  15. Program the generator control module, if replaced. Refer to «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) .
  16. Program the battery energy control module, if replaced. Refer to «Battery Energy Control Module Programming and Setup»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__battery-energy-control-module-programming-and) .
  1. Ignition OFF, disable the high voltage at the A4 hybrid battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Remove the fuel tank. Refer to «Fuel Tank Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-24l-repair-instructions) .
  3. Remove the left front underbody air deflector.
  4. Remove the left front frame reinforcement. Refer to «Drivetrain and Front Suspension Frame Replacement»(/buick/regal/v-2009-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  5. Remove the high voltage 3-phase cable terminal nuts (1) and the 12V terminal branch nut (4).
  6. Remove the high voltage cable (2) and the 12V cable (3) from the generator battery.
  7. Remove the drive motor generator battery bracket nuts (1) and the cable retainer nut (2).
  8. Pull the drive motor generator cable (3) through the grommet opening.
  9. Remove the drive motor generator retainer nut (1) and bolt (2).
  10. Detach the drive motor generator battery cable fasteners (3).
  11. Remove the drive motor generator battery fastener bolts (1).
  12. Within the rear engine compartment, remove the drive motor generator battery cable retainer nut (1).
  13. Disconnect the drive motor generator battery cable retainers (1) and the battery tray cable clip (2).
  14. Remove the drive motor generator battery cable terminal (1), from the underhood fuse block.
  15. Remove the generator starter cover nuts (1) and remove the cover (2).
  16. Remove the bolts (1) and detach the drive motor generator battery cable from the generator starter.
  17. Detach the retainers (1) holding the drive motor generator battery cable to the fuel pump cover and the heater outlet bracket.
  18. Remove the drive motor generator battery cable from the vehicle.
  1. Starting at the rear of the vehicle, feed the drive motor generator battery cable through the opening in the floor.
  2. Position the pass-through grommet seal and bracket. Tighten the bracket nuts (1) to 22 N.m (16 lb ft).
  3. Tighten the retainer nut (2) to 22 N.m (16 lb ft).
  4. Install the high voltage 3-phase branch terminals (2) to the generator battery. Tighten the nuts (1) to 9 N.m (80 lb in).
  5. Install the 12V cable (3) and tighten the nut (4) to 9 N.m (80 lb in).
  6. At the left rear frame rail, attach the drive motor generator battery cable to the frame with NEW fasteners (3).
  7. Install the retainer nut (1) and bolt (2) to the underbody. Tighten to 22 N.m (16 lb ft).
  8. Working towards the front of the vehicle, attach the drive motor generator battery cable to the underbody. Tighten the nuts (1) to 22 N.m (16 lb ft).
  9. Feed the drive motor generator battery cable into the engine compartment and install to the plenum. Tighten the nut (1) to 22 N.m (16 lb ft).
  10. Install the drive motor generator battery 12V branch, to the left front frame rail, with NEW fasteners (1).
  11. Secure the cable to the battery tray with clip (2).
  12. Install the 12V terminal (1) to the underhood fuse block and tighten the nut to 9 N.m (80 lb in).
  13. Fasten the drive motor generator battery cable to the heater outlet bracket and fuel pump cover with NEW fasteners (1).
  14. Position the drive motor generator battery cable to the starter generator assembly studs. Tighten the bolts (1) to 9 N.m (80 lb in).
  15. Install the cover (2) and tighten the nuts (1) to 9 N.m (80 lb in).
  16. Install the left front frame reinforcement. Refer to «Drivetrain and Front Suspension Frame Replacement»(/buick/regal/v-2009-2013/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  17. Install the left front underbody air deflector.
  18. Install the fuel tank. Refer to «Fuel Tank Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-24l-repair-instructions) .
  19. Enable the high voltage system. Refer to «High Voltage Enabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-enabling) .
  1. Ignition OFF, disable the high voltage at the A4 hybrid battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Disconnect the following connectors, in the above graphic sequence shown, from the generator battery control module.
  3. Remove the battery energy control module right side harness (1) and the left side harness (2).
  1. Install the right side battery energy control module harness (1) and the left side harness (2), into the harness conduit.
  2. Connect the battery energy control module connectors in the above graphic sequence.
  3. Enable the hybrid battery. Refer to «High Voltage Enabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-enabling) .
  1. Ignition OFF, disable the high voltage at the A4 hybrid battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Remove the cut-off switch fastener (1) and the cut-off switch (2) from the battery energy control module wiring junction block.
  3. Remove the current sensor connector (3); the pre-charge contacts (4) and the contactor connector (5).
  4. Remove the generator control module connector (1).
  5. Remove the connector (1) from the battery energy control module.
  6. Remove the battery energy control harness (1).
  1. Install the cut-off switch (2) to the battery energy control module wiring harness junction block and tighten the fasteners (1) to 4 N.m (35 lb in).
  2. Connect the following to the generator battery disconnect relay block: Current Sensor Connector (3). Pre-Charge Contacts (4). Contactor Connector (5).
  3. Install the connector (1) to the generator control module.
  4. Install the connector (1) to the battery energy control module.
  5. Enable the hybrid battery. Refer to «High Voltage Enabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-enabling) .
  1. Disable the hybrid battery. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Remove the battery energy control module. Refer to «Battery Energy Control Module Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) .
  3. Remove the battery energy control module wiring junction block. Refer to «Battery Energy Control Module Wiring Junction Block Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) .
  4. Remove the generator battery fasteners (1) and (2).
  5. Remove the fasteners (1) and (2).
  6. Remove the mounting location fastener (3).
  7. Slide the generator battery (1) in the direction shown in the graphic.
  8. With the help of a second technician, lift the generator battery (1) into the rear compartment area.
  9. Inspect the intermediate duct seals (2) and replace if damaged.
  1. With the help of a technician, install the generator battery (1) to the mounting studs.
  2. Slide the generator battery towards the intermediate duct seals and install the locating fastener (3). Tighten the fastener (3) to 22 N.m (16 lb ft).
  3. Install the generator battery fastener (2) and tighten to 22 N.m (16 lb ft).
  4. Install the generator battery fasteners (2) and tighten to 22 N.m (16 lb ft).
  5. Install the generator battery fasteners (1) and tighten to 22 N.m (16 lb ft).
  6. Install the generator battery fasteners (2) and tighten to 22 N.m (16 lb ft).
  7. Install the battery energy control module. Refer to «Battery Energy Control Module Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) .
  8. Install the battery energy control module wiring junction block. Refer to «Battery Energy Control Module Wiring Junction Block Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) .
  9. Install the battery energy control module harness. Refer to «Battery Energy Control Module Wiring Harness Replacement (BDU, BECM and BPIM)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) , «Battery Energy Control Module Wiring Harness Replacement (HV Measuring Harness 1 and 2)»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system) .
  10. Enable the hybrid battery. Refer to «High Voltage Enabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-enabling) .

For equivalent regional tools, refer to Special Tools .

  1. Remove the rear compartment floor panel. Refer to «Rear Compartment Floor Panel Trim Replacement (with Battery Cover, HP6)»(/buick/regal/v-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) , «Rear Compartment Floor Panel Trim Replacement (with Blower Cover, HP6)»(/buick/regal/v-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  2. Remove the battery vent tube (1) from the rear compartment grommet (2).
  1. Install the battery vent tube (1) from the rear compartment grommet (2).
  2. Install the rear compartment floor panel. Refer to «Rear Compartment Floor Panel Trim Replacement (with Battery Cover, HP6)»(/buick/regal/v-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) , «Rear Compartment Floor Panel Trim Replacement (with Blower Cover, HP6)»(/buick/regal/v-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  1. Ignition OFF, disable the high voltage at the A4 hybrid battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Remove the high voltage fasteners (1) and the high voltage cables (2) from the drive motor battery junction block relay.
  3. Remove the cut-off switch fastener (1) and set aside the cut-off switch (2).
  4. Remove the generator battery disconnect relay fasteners (1) and remove the drive motor battery junction block relay (2).
  1. Install the drive motor battery junction block relay (2) to the generator control module and tighten the fasteners (1) to 9 N.m (80 lb in).
  2. Install the cut-off switch (2) to the drive motor battery junction block relay and tighten the fastener (1) to 4 N.m (35 lb in).
  3. Install the high voltage cables (2) to the drive motor battery junction block relay and tighten the fasteners (1) to 9 N.m (80 lb in).
  4. Enable the hybrid battery. Refer to «High Voltage Enabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-enabling) .
  1. Ignition OFF, disable the high voltage at the A4 hybrid battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Remove the high voltage cable fastener (1) and the high voltage cable (2), from the generator battery disconnect relay junction block.
  3. Remove the current sensor connector (3), the pre-charge contacts (4) and the contactor connector (5).
  4. Remove the generator control module connector (1).
  5. Remove the battery energy control module junction block fasteners (1) and remove the generator battery disconnect relay junction block (2).
  1. Install the generator battery disconnect relay junction block (2) and tighten the fasteners (1) to 9 N.m (80 lb in).
  2. Connect the following to the generator battery disconnect relay junction block : Current Sensor Connector (3). Pre-Charge Contacts (4). Contactor Connector (5).
  3. Install the connector (1) to the generator control module.
  4. Install the high voltage cables (2), to the generator battery disconnect relay junction block and tighten the fasteners (1) to 9 N.m (80 lb in).
  5. Enable the hybrid battery. Refer to «High Voltage Enabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-enabling) .

Scheme 255

Scheme 255: Drive Motor Generator Control Module Tray Replacement
Scheme 255: Drive Motor Generator Control Module Tray Replacement
CalloutComponent Name
WARNING: Ensure all High Voltage safety procedures are followed. Failure to follow the procedure exactly as written may result in serious injury or death. 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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedure Remove the battery energy control module. Refer to Battery Energy Control Module Replacement . Remove the generator control and battery module. Refer to Generator Control and Battery Module Replacement and Shipping Preparation . Remove the generator control module cooling air inlet duct. Refer to Generator Control Module Cooling Air Inlet Duct Replacement
1Drive Motor Generator Control Module Cable Tray Fasteners (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten 22 N.m (16 lb ft).
2Drive Motor Generator Control Module Cable Tray NOTE: Replace the drive motor generator control module seal.
WARNING
Ensure all High Voltage safety procedures are followed. Failure to follow the procedure exactly as written may result in serious injury or death.
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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .
NOTE
Replace the drive motor generator control module seal.

Drive Motor Generator Control Module Tray Replacement

  1. Ignition OFF, disable the high voltage at the A4 hybrid battery pack. Refer to High Voltage Disabling, for Servicing Internal Components within the A4 Hybrid/EV Battery Pack «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Disconnect the generator control module connector (1).
  3. Remove the fasteners (1) securing the drive motor battery wire junction block relay (2), to the top of the generator control module.
  4. Remove the fasteners (3) securing the battery energy control module wiring junction block (4), to the top of the generator control module.
  5. Remove the high voltage bus fasteners (1) from the battery energy control module wiring junction block (2).
  6. Lift the drive motor battery wire junction block relay (1) and the battery energy control module wiring junction block with the harness attached, and place on top of the battery energy control module (3).
  7. Remove the generator control module mounting fasteners (1) and (2).
  8. Remove the generator control module (3) from the support tray.
  1. Inspect the foam seals for tears and leak paths, to ensure they will not compromise the internal air flow through the generator control module assembly.
  2. Install the generator control module (3) to the support tray studs. Tighten the fastener (1) to 9 N.m (80 lb in).
  3. Tighten the remaining fasteners (2) to 9 N.m (80 lb in).
  4. Place the drive motor battery wire junction block relay (1) and the battery energy control module wiring junction block (2), on top of the generator control module.
  5. Install the high voltage bus fasteners (1) to the battery energy control module wiring junction block (2) and tighten to 9 N.m (80 lb in).
  6. Install the battery energy control module wiring junction block fasteners (1) and tighten to 9 N.m (80 lb in).
  7. Install the battery energy control module wiring junction block fasteners (2) and tighten to 9 N.m (80 lb in).
  8. Connect the generator control module connector (1).
  9. Enable the high voltage at the A4 hybrid battery pack. Refer to «High Voltage Enabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-enabling) .
  10. Program the generator control module. Refer to «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) .
  1. Remove both rear compartment floor panels. Refer to «Rear Compartment Floor Panel Trim Replacement (with Battery Cover, HP6)»(/buick/regal/v-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) , «Rear Compartment Floor Panel Trim Replacement (with Blower Cover, HP6)»(/buick/regal/v-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
  2. Remove the generator control module cooling air outlet duct. Refer to «Generator Control Module Cooling Air Outlet Duct Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-cooling-system) .
  3. Disable the hybrid battery. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  4. Remove the drive motor generator battery bracket. Refer to «Drive Motor Generator Battery Bracket Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-cooling-system) .
  5. Remove the body harness connectors (1) from the generator control and battery module.
  6. Remove the high voltage 3-phase cable terminal nuts (1) and the 12V terminal branch nut (4).
  7. Remove the high voltage cable (2) and the 12V cable (3) from the generator control and battery module.
  8. Remove the drive motor battery cooling blower outlet duct fasteners (1).
  9. Detach the drive motor battery cooling blower outlet duct retainers (1) from the generator control and battery module.
  10. Detach the drive motor battery cooling air inlet upper duct retainers (1).
  11. Remove the generator control module cover fasteners (1).
  12. Remove the generator control module cover fastener (2) and remove the generator control module cover (3).
  1. Install the generator control module cover (3).
  2. Install the generator control module cover fasteners (1) and tighten to 9 N.m (80 lb in).
  3. Install the generator control module cover fastener (2) and tighten to 9 N.m (80 lb in).
  4. Install thedrive motor battery cooling blower motor. Refer to «Drive Motor Battery Cooling Blower Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-cooling-system) .
  5. Install the generator control module cooling air outlet duct. Refer to «Generator Control Module Cooling Air Outlet Duct Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-cooling-system) .
  6. Install the high voltage 3-phase cable (2) to the generator control and battery module. Tighten the nuts (1) to 9 N.m (80 lb in).
  7. Install the 12V cable (3) to the generator control and battery module. Tighten the nut (4) to 9 N.m (80 lb in).
  8. Install the body harness connectors (1).
  9. Install the drive motor battery cooling air inlet lower duct.
  10. Install the drive motor generator battery bracket. Refer to «Drive Motor Generator Battery Bracket Replacement»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-cooling-system) .
  11. Install the intermediate duct retainers (1) to the generator control and battery module.
  12. Enable the hybrid battery. Refer to «High Voltage Enabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-enabling) .

Scheme 256

Scheme 256: Generator Control Module Cable Cover Replacement
Scheme 256: Generator Control Module Cable Cover Replacement
CalloutComponent Name
WARNING: Ensure all High Voltage safety procedures are followed. Failure to follow the procedure exactly as written may result in serious injury or death. 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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedure Remove the rear compartment floor panel trim with blower cover, HP6. Refer to Rear Compartment Floor Panel Trim Replacement (with Battery Cover, HP6) , Rear Compartment Floor Panel Trim Replacement (with Blower Cover, HP6) . Disable the high voltage. Refer to High Voltage Disabling .
1Generator Control Module Cable Cover Fasteners (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten 9 N.m (80 lb in).
2Generator Control Module Cable Cover
WARNING
Ensure all High Voltage safety procedures are followed. Failure to follow the procedure exactly as written may result in serious injury or death.
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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .

Generator Control Module Cable Cover Replacement

  1. Disable the hybrid battery. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Remove the high voltage cable fasteners (1) from the B1 and B2 studs.
  3. Remove the high voltage cable fasteners (1) from the battery energy control module (BECM) junction block.
  4. Remove the high voltage cables (2) from the BECM junction block.
  1. Install the high voltage cable (2) to the BECM junction block and tighten the fasteners (1) to 9 N.m (80 lb in).
  2. Enable the hybrid battery. Refer to «High Voltage Enabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-enabling) .
  1. Disable the hybrid battery. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Remove the high voltage cable fastener (1) and the high voltage cable (2), from the generator battery disconnect relay junction block (3).
  1. Install the the high voltage cable (2), to the generator battery disconnect relay junction block (3) and tighten the fastener (1) to 9 N.m (80 lb in).
  2. Enable the hybrid battery. Refer to «High Voltage Enabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-enabling) .
  1. Ignition OFF, disable the high voltage at the A4 hybrid battery pack. Refer to «High Voltage Disabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-disabling) .
  2. Remove the high voltage fasteners (1) and the high voltage cables (2) from the generator battery fuse.
  3. Remove the generator fuse fastener (1) and remove the generator battery fuse (2).
  1. Install the generator battery fuse (2) and tighten the fastener (1) to 9 N.m (80 lb in).
  2. Install the high voltage cable (2) to the generator battery fuse and tighten the fastener (1) to 9 N.m (80 lb in).
  3. Enable the hybrid battery. Refer to «High Voltage Enabling»(/buick/regal/v-2009-2013/remont/body-electrical/#hybridev-energy-storage-system__high-voltage-enabling) .

Scheme 257

Scheme 257: Battery Auxiliary Tray Replacement
Scheme 257: Battery Auxiliary Tray Replacement
CalloutComponent Name
WARNING: Ensure all High Voltage safety procedures are followed. Failure to follow the procedure exactly as written may result in serious injury or death. 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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death. Preliminary Procedure Remove the generator control and battery module. Refer to Generator Control and Battery Module Replacement and Shipping Preparation .
1Battery Auxiliary Tray Fasteners (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten 22 N.m (16 lb ft).
2Battery Auxiliary Tray Fasteners (Qty: 4) Tighten 58 N.m (43 lb ft).
3Battery Auxiliary Tray
WARNING
Ensure all High Voltage safety procedures are followed. Failure to follow the procedure exactly as written may result in serious injury or death.
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. Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 15 meters (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 with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedures exactly as written may result in serious injury or death.
CAUTION
Refer to Fastener Caution .

Battery Auxiliary Tray Replacement

Clear Secured High Voltage DTCs

The Clear Secured High Voltage DTCs procedure must be completed when a latched DTC is set, a vehicle crash event has been detected, or when the starter/generator control module has been replaced.

Clearing DTCs After a Vehicle Crash Event

Note. Before clearing any DTCs after a vehicle crash event, inspect and ensure the high voltage system integrity has not been compromised during the crash event. Refer to High Voltage System Inspection .

  1. Connect a scan tool to the vehicle.
  2. Ignition ON, select Clear Secured High Voltage DTCs in the Hybrid Powertrain Control Module Control Functions list.
  3. Select Hybrid Powertrain Control Module.
  4. Follow the scan tool directions to complete the procedure.
  5. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
  6. Ignition ON, select Clear Secured High Voltage DTCs in the Hybrid Powertrain Control Module Control Functions list.
  7. Select Battery Energy Control Module.
  8. Follow the scan tool directions to complete the procedure.
  9. Clear any DTCs that may be set.

Clearing High Voltage DTCs

  1. Connect a scan tool to the vehicle.
  2. Ignition ON, select Clear Secured High Voltage DTCs in the Hybrid Powertrain Control Module Control Functions list.
  3. Select Battery Energy Control Module.
  4. Follow the scan tool directions to complete the procedure.
  5. Clear any DTCs that may be set.

Drive Motor Battery System Description

The hybrid energy storage system uses a number of modules and components to store electricity for use by the eAssist system. The hybrid energy storage system stores 115 V DC in two lithium-ion battery sections. Current flows from the battery sections through a series of contactors and a service disconnect. This allows the system to control the disconnect of high voltage from the vehicle and also creates a redundant disconnect to ensure voltage is disabled when servicing high voltage components. To ensure optimum life of the lithium-ion batteries, the hybrid energy storage system monitors the state of charge of each battery cell. The system will equalize the state of charge of each cell through a balancing process. The hybrid energy storage system is also responsible for monitoring and controlling the charging and the discharging of the high voltage battery.

The primary component of the hybrid energy storage system is the hybrid/EV battery pack. The hybrid/EV battery pack is a modular battery pack assembly that not only contains the lithium-ion battery sections, but also many of the control modules and components used by the eAssist system.

The Hybrid/EV Battery Pack contains the following serviceable components

  1. Hybrid/EV Battery Section 1
  2. Hybrid/EV Battery Section 2
  3. Battery Energy Control Module
  4. Starter/Generator Control Module
  5. Main Contactor - located in the generator battery disconnect relay assembly
  6. Pre-Charge Contactor - located in the generator battery disconnect relay assembly
  7. Hybrid/EV Battery Pre-Charge Resistor - located in the generator battery disconnect relay assembly
  8. Hybrid/EV Battery Pack Current Sensor - located in the generator battery disconnect relay assembly
  9. Hybrid/EV Battery Pack High Voltage Manual Disconnect Lever - located in the battery energy control module wiring junction block assembly
  10. Generator Battery Fuse - located in the battery energy control module wiring junction block assembly
  11. High Voltage Interlock Switch

Hybrid/EV Battery Pack

The hybrid/EV battery pack is located in the rear compartment of the vehicle, directly behind the rear passenger seat, and serves as a modular assembly to contain many of the eAssist control modules and system components. The hybrid/EV battery pack may also be referred to as the following names

  1. Energy Storage System
  2. Power Pack
  3. Generator Control and Battery Module Assembly

The hybrid/EV battery pack first consists of a metal tray that is fixed to the vehicle floor. This provides a strong mount for other components to secure to. Within the hybrid/EV battery pack, the hybrid/EV battery section 1 and hybrid/EV battery section 2 are located nearest to the left side of the vehicle. Directly above the battery sections is the battery energy control module. To the right of the battery sections and nearest to the right side of the vehicle is the starter/generator control module. Above the starter/generator control module is the generator battery disconnect relay assembly and battery energy control module wiring junction block assembly. A case cover is secured over the top of all components, effectively creating the hybrid/EV battery pack and preventing access to any high voltage components without first disabling the high voltage system.

The hybrid/EV battery pack is also integral to the hybrid/EV cooling system. Foam gaskets are adhered to the metal battery pack tray. This seals the underside of the starter/generator control module to ensure proper airflow under the control module for cooling purposes. The hybrid/EV battery pack case cover also provides a mounting surface for the hybrid/EV battery pack cooling fan and has openings where the plastic vents are allowed to pass into the hybrid/EV battery pack to direct air through components which require cooling.

Hybrid/EV Battery Section 1 and Hybrid/EV Battery Section 2

The hybrid/EV battery section 1 and hybrid/EV battery section 2 are a pair of lithium-ion batteries connected in series to make up the 115 V DC battery. The two sections are diagnosed and serviced as a single battery assembly. The individual battery sections are not serviced separately.

The hybrid battery contains a total of 32 cell groups, with each section containing 16 cells that are connected in series using internal bus bars. The two battery sections are externally connected in series using high voltage cable. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 118 V DC.

The hybrid battery sections are air cooled. Each battery case has an air inlet and an air outlet. Air is drawn through the battery case to cool the individual cells. Attached to each case is a vent tube. In the event of a damaged or ruptured battery, any outgassing will be vented to the outside of the vehicle.

A voltage sense circuit is attached to each individual cell. Each of these circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness connects the voltage sense circuits to the battery energy control module, located directly above the battery sections. The sensor itself is a part of the battery cell and is not serviceable.

Battery Energy Control Module

The battery energy control module is located directly above the hybrid/EV battery section 1 and hybrid/EV battery section 2. The module is responsible for monitoring the hybrid/EV battery section 1 and hybrid/EV battery section 2 parameters and reporting this to the starter/generator control module. The battery energy control module may also be known as the BECM, voltage current temperature module, or voltage temperature interface module (VTIM).

The battery energy control module monitors the voltage of each battery cell section. A voltage sense circuit is attached to each individual cell group. Each of these circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness connects the voltage sense circuits to the battery energy control module, located directly above the battery sections. The sensor itself is a part of the battery cell and is not serviceable.

The battery energy control module also measures critical temperatures within the two battery sections and at the hybrid/EV battery section 1 air inlet. Six temperature sensors are used to monitor the battery temperature. The battery temperature sensors are located in the battery sections. Two of the temperature sensors are located on the top of the battery section and the remaining four are located on the bottom of the section. The temperature sensor is a variable resistor that measures the temperature of the battery cell group. The battery energy control module supplies 5 V to the signal circuit and a ground for the low reference circuit. The battery temperature sensor resistance changes with battery temperature. As the temperature decreases, the sensor resistance increases. As the temperature increases, the sensor resistance decreases. The air inlet temperature sensor operates in much the same way, except that it measures the temperature of the incoming air used to cool the hybrid/EV battery pack at the hybrid/EV battery section 1 air inlet. None of the temperature sensors or the temperature sensor harness is serviceable. They are all serviced as part of the battery sections.

The battery energy control module is responsible for the cell balancing process. During operation, individual cells may charge or discharge at different rates. To ensure proper battery health and optimal life, these voltages are balanced, with energy from a higher voltage cell being transferred to a lower voltage cell. This keeps the voltage consistent between all 32 cell groups. Cell balancing is an internal process of the battery energy control module. Internal gates allow energy to flow between cells using the same circuits that are used to monitor cell voltage.

Starter/Generator Control Module

The starter/generator control module is a multifunction module that is involved in many eAssist system operations. The starter/generator control module contains two internal microprocessors: a battery control processor and a motor control processor. The battery control processor is responsible for the following

  1. Communicating with the battery energy control module to determine the status of the high voltage battery
  2. Controlling the battery and starter/generator cooling systems
  3. Controlling the main and pre-charge contactors
  4. Monitoring the high voltage interlock loops
  5. Monitoring for isolation faults
  6. Supplying 12 V to the vehicle

Internal to the starter/generator control module, the motor control processor is responsible for propulsion activities and the 14 V control module is responsible for maintaining 12 V to the vehicle. The starter/generator control module may also be referred to as the following names

  1. SGCM
  2. Hybrid Powertrain Control Module (HPCM)
  3. Accessory Power Module (APM)
  4. Battery Power Inverter Module (BPIM)
  5. Power Inverter Module (PIM)

Hybrid/EV Battery Control

The starter/generator control module interfaces with the battery energy control module to determine the status of the battery voltage and battery temperature. The starter/generator control module uses voltage information from the battery energy control module to make decisions about the battery state of health, how the battery should be charged or discharged, and when to initiate cell balancing.

Hybrid/EV Battery and Starter/Generator Cooling

The starter/generator control module uses temperature information from the battery energy control module to control the hybrid/EV battery pack cooling fan. The starter/generator control module also monitors the starter/generator coolant temperature sensor and will control the starter/generator coolant pump relay, which controls the starter/generator coolant pump.

High Voltage Contactors

At times, it may be necessary to disconnect high voltage from the vehicle, both during normal operation and when a system fault is identified. The starter/generator control module controls the main contactor and pre-charge contactor to disconnect and connect high voltage from the vehicle.

High Voltage Interlock

The high voltage interlock is a fail-safe to disable high voltage when the starter/generator control module identifies that a high voltage area has been accessed. The hybrid/EV battery pack has a high voltage interlock switch located on the service access cover. The starter/generator also has a high voltage interlock switch on the access cover. When either cover is removed, the interlock loop is opened. The starter/generator control module will open the contactors to prevent technician contact with high voltage.

High Voltage Isolation

The starter/generator control module monitors the electrical potential between high voltage and the vehicle chassis. High voltage should always be isolated from the vehicle chassis by a certain amount of resistance to avoid the potential for a life threatening current path. In the event that a high voltage leak path is detected to the vehicle chassis, the starter/generator control module will set a DTC and open the contactors to remove high voltage.

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

12 V Output

The starter/generator control module essentially takes the place of the generator on a traditional vehicle. The starter/generator control module converts high voltage DC to a 12 V DC for accessory electrical operation and to charge the 12 V battery.

Main Contactor, Pre-Charge Contactor, and Pre-Charge Resistor

The high voltage contactors are switches that are controlled like a relay. To disable high voltage from the vehicle, the main and pre-charge contactors are commanded open. This will open the contactors and physically disconnect the hybrid/EV battery positive cable. To connect high voltage to the vehicle, first the pre-charge contactor is closed. With the pre-charge contactor closed, current flows through the pre-charge resistor. This allows high voltage to slowly build in the system. Once high voltage is brought up though the pre-charge contactor, the main contactor is close and high voltage is active. If the high voltage builds too quickly or too slowly, the starter/generator control module will set a fault.

Both the main contactor and the pre-charge contactor are controlled in a similar manner. B+ is applied at all times to each contactor. Each contactor is controlled by an independent low side driver in the starter/generator control module. When the starter/generator control module commands the contactor closed, ground is applied to the contactor through the low side driver and the contactor is closed.

Both contactors and the pre-charge resistor are located in the generator battery disconnect relay assembly. The generator battery disconnect relay assembly is a plastic tray that is secured to the top of the starter/generator control module. The generator battery disconnect relay assembly also contains the hybrid/EV battery pack current sensor and a series of bus bars and cables that electrically connect the hybrid/EV battery to the starter/generator control module.

Hybrid/EV Battery Pack Current Sensor

The hybrid/EV battery pack current sensor is a three-wire hall effect sensor that measures current flow from the hybrid/EV battery. The battery energy control module applies 5 volt and provides a low reference to power the sensor. Current measurement is communicated to the battery energy control module via a signal circuit.

The hybrid/EV battery pack current sensor is located in the generator battery disconnect relay assembly. The generator battery disconnect relay assembly is a plastic tray that is secured to the top of the starter/generator control module. The generator battery disconnect relay assembly also contains the high voltage contactors, pre-charge resistor, and a series of bus bars and cables that electrically connect the hybrid/EV battery to the starter/generator control module. The hybrid/EV battery pack current sensor monitors current on the hybrid/EV battery negative bus bar.

Hybrid/EV Battery Pack High Voltage Manual Disconnect Lever and Generator Battery Fuse

The hybrid/EV battery pack high voltage manual disconnect lever provides a redundant method to disconnect high voltage from vehicle when performing service on the system. With the switch open, high voltage is physically disconnected from the hybrid/EV battery positive cable. Together with the high voltage interlock and the high voltage contactors, the manual disconnect provides a means of disconnecting high voltage at two points in the system. This provides a double-layer of protection.

The generator battery fuse is a 125 A fuse to prevent an overcurrent condition in the 115 V DC system.

The hybrid/EV battery pack high voltage manual disconnect lever and generator battery fuse are located in the battery energy control module wiring junction block assembly. The battery energy control module wiring junction block assembly is a plastic tray that is secured to the top of the starter/generator control module.

High Voltage Interlock Switch

The high voltage system uses two high voltage interlock switches to indicate that an area of the vehicle that contains a high voltage connection has been exposed. These locations are at the starter/generator and the hybrid/EV battery pack. The two interlock switches are completely separate and are not tied together.

The starter/generator control module applies a constant 5 V reference to the high voltage interlock switch and monitors the voltage. Each high voltage interlock switch contains a resistor. With the high voltage interlock connected, the 5 V reference voltage travels through the resistor and is reduced by a specific amount. This indicates that the high voltage interlock switch is closed and no circuit faults have occurred. If the high voltage interlock switch is removed or a circuit fault occurs, the voltage will change and the starter/generator control module will open the contactors.

The hybrid/EV battery pack high voltage interlock switch is part of the hybrid/EV battery pack cable cover. When the cover is removed, the high voltage interlock switch is also removed. To remove the cover, the hybrid/EV battery pack high voltage manual disconnect lever must also be opened, providing a second means of disconnecting high voltage.

The starter/generator high voltage interlock switch is part of the starter/generator cable cover. When the cover is removed, the high voltage interlock switch is also removed.

Illustration Tool Number/ Description EL-48264 Battery Pack Lifting Adapter EL-48571-1 High Voltage Battery Pin Out Box EL-48900 High Voltage Safety Kit EL-50772 Insulation Mulimeter

See also:
• Battery Negative Cable Disconnection and Connection
• Diagnostic Trouble Code (DTC) List - Vehicle
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Exterior Lights Schematics
• COMPONENT CONNECTOR END VIEWS -- INDEX
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Starter Generator Replacement
• Brake Pedal Position Sensor Replacement
• Battery Inspection/Test
• Hybrid Cooling Schematics
• Special Tools
• Power Mode Mismatch
• DTC U2099
• Fastener Caution
• Battery Energy Control Module Programming and Setup
• Rear Compartment Floor Panel Trim Replacement (with Battery Cover, HP6)
• Fuel Tank Replacement
• Drivetrain and Front Suspension Frame Replacement
• Special Tools
• High Voltage Safety
• Drive Motor Battery System Description
• High Voltage Disabling
• Clear Secured High Voltage DTCs
• High Voltage Enabling
• High Voltage System Inspection

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