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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 18 (Hybrid/EV System Heating And Cooling) >> Diagnostic Information and Procedures >> DTC P0C32: Hybrid/EV Battery Pack Cooling System >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
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 includes the following steps:

  • 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 may result in serious injury or death.

WARNING:

The 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. Visually inspect the inlet and outlet of the Hybrid/EV Battery Pack Cooling Fan ducts.
  2. Verify the inlet and outlet are free of any debris or obstructions that will limit airflow through the duct.
    • If any debris or obstructions are found 

      Remove the obstruction to allow proper airflow and allow the Hybrid/EV Battery Pack to cool before retesting.

    • If no debris or obstructions are found 
  3. Verify the Hybrid/EV Battery Pack Cooling Fan ducts are properly secured and are not crimped, crushed, or deformed in a manner that will limit airflow through the duct.
    • If the ducts are unsecured or damaged 

      Repair or replace as necessary and allow the Hybrid/EV Battery Pack to cool before retesting.

    • If the ducts are properly secured and undamaged 
  4. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the G14 Hybrid/EV Battery Pack Cooling Fan. It may take up to 2 minutes for all vehicle systems to power down.
  5. Test for less than 10 Ω between the ground circuit terminal 1 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω between the ground circuit terminal 1 and ground.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  6. Ignition ON.
  7. Verify a test lamp illuminates between the B+ circuit terminal 5 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the G14 Hybrid/EV Battery Pack Cooling Fan.
    • If the test lamp illuminates 
  8. Verify that the Hybrid/EV Battery Pack Cooling Fan speed increases and decreases as the Hybrid Battery Fan Speed is commanded from 10%-90% with a scan tool.
    • If the fan speed does not change 

      Replace the G14 Hybrid/EV Battery Pack Cooling Fan.

    • If the fan speed changes 
  9. Monitor the airflow at the intake duct and outlet duct while commanding the Hybrid Battery Fan Speed from 10%-90% with a scan tool. The actual airflow should increase as the fan speed is increased.
    • If the airflow does not increase 
    1. Ignition OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to High Voltage Disabling .
    2. Remove any debris or obstructions that may limit airflow in the cooling ducts through the A4 Hybrid/EV Battery Pack and the heat sink under the K59 Starter/Generator Control Module.
    • If the airflow increases 
  10. Verify the scan tool Battery Energy Control Module Battery Temperature parameters are all between -39° and 60°C (-38.2 and 140°F).
    • If not between -39° and 60°C (-38.2 and 140°F) 

      Replace the C4A Hybrid/EV Battery Section 1 and C4B Hybrid/EV Battery Section 2.

    • If between -39° and 60°C (-38.2 and 140°F) 
  11. All OK.
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