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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1382 (Hybrid Cooling System) >> Diagnostic Information and Procedures >> DTC P0A7E or P1ABE >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    WARNING: 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 procedure exactly as written may result in serious injury or death.
  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling .
  2. Remove the drive motor generator battery upper cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement .
  3. Verify that there is no cooling fan inlet duct or outlet duct obstruction.
    • If obstructed, remove or repair as needed for proper air flow.
  4. Inspect the vent fan for any damage to the fan blades.
    • If fan or blades are damaged replace the battery vent fan.
  5. Unclip and remove all four hybrid battery temperature sensors from the batteries and allow them to stand at room air temperature for approximately 3 minutes. If the batteries are hot, allow them to cool.
  6. Ignition OFF, disconnect the X3 harness connector at the GBCM.
  7. Verify that the resistance of each temperature sensor is within specification, and within 500 Ω of each other. Refer to Temperature Versus Resistance .
    • If not within the specified range, replace the drive motor battery sensor module wiring harness assembly.
  8. If all circuits test normal, replace the drive motor generator battery control module.
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