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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 180 (Hybrid Energy Storage System) >> Diagnostic Information and Procedures >> DTC P1AE6 or P1AE7 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Are you preparing the drive motor generator battery for shipment?
    • If you are preparing the drive motor generator battery for shipment, Install the terminal extension cover assembly, using UL® listed or equivalent insulation tape rated at a minimum of 600 volts, tape over the manual disconnect opening and the HV cable openings on terminal extension cover. Remove the drive motor battery assembly, refer to Drive Motor Generator Battery Replacement .
    • If you are not preparing the drive motor generator battery for shipment, continue with diagnosis.
  2. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P1AE6 is not set.
    • If DTC P1AE6 is set, replace the drive motor generator battery control module.
    3. WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.
    The High Voltage Disabling procedure will perform the following tasks:
    • Identify how to disable high voltage.
    • Identify how to test for the presence of high voltage.
    • Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

    Failure to follow the procedures exactly as written may result in serious injury or death.
  3. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling . Verify that the high voltage contactor relays are not stuck closed.
  4. Remove the drive motor generator battery case upper cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement .
  5. Visually inspect the high voltage dc cables internal to the drive motor generator battery for damage or short to chassis ground.
    • If any of the high voltage (HV) cables are visually observed as being damaged or grounded, replace the HV cables as necessary.
    • If the high voltage (HV) cables are not visually observed as being damaged or grounded, replace the drive motor generator battery control module.
  6. Enable the high voltage, refer to High Voltage Enabling .
  7. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P1AE7 does not reset.
    • If DTC P1AE7 is set, replace the drive motor battery assembly.
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