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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.
    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.
  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 case upper cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement .
  3. Disconnect the X4 harness connector at the BECM.
  4. Connect theEL-48571  high voltage battery pin out box to the X4 harness connector. See Special Tools .
  5. Install the high voltage manual disconnect lever.
  6. Test for 13-19 volts across all 20 battery voltage reference circuits and that they are within 1.5 volts of each other.
    • If not within the specified range, replace the drive motor battery assembly.
    • If all circuits test normal, replaced the drive motor generator battery control module.
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