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Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    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 50 feet of the vehicle, either indoors or outdoors.
    • Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.
      • Visually and functionally inspect the gloves before use.
      • Wear the Insulation gloves at all times when working with the high voltage battery assembly, whether the system is energized or not.

    Failure to follow the procedures exactly as written may result in serious injury or death.
  1. Ignition OFF, disconnect the X1 harness connector at the drive motor generator power inverter module assembly.
  2. Ignition ON, verify that the scan tool Contactor System Request Circuit Command parameter is 100 percent.
  3. Install a 3 A fused jumper wire between the control circuit terminal 4 and ground. Verify that the scan tool Contactor System Request Circuit Command parameter is 0 percent.
    • If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the drive motor generator battery control module.
  4. If all circuits test normal, replace the drive motor generator power inverter module assembly.
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