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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 497 (Hybrid/EV Energy Storage System) >> Diagnostic Information and Procedures >> DTC P1A1F or P1A4E >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. 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 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.

  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling .
  2. Test for 230-407 V between the high voltage positive terminal X2 at the high voltage positive contactor and the high voltage negative terminal X2 at the high voltage negative contactor.
    • If the voltage is less than 194 V, replace the drive motor generator battery.
    • If the voltage is between 194-230 V, perform the jump assist. Refer to Jump Assist .
    • If the voltage is greater than 407 V, replace the drive motor generator battery control module.
  3. Disconnect the X4 harness connector at the drive motor generator battery control module.
  4. Connect the EL-48571  high voltage battery pin out box.
  5. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.
  6. Each battery voltage reading should be between 10-19 V.
    • If not within the specified range, replace the drive motor battery assembly.
  7. Each battery voltage reading should be within 1.5 V of each other.
    • If not within the specified range, replace the drive motor battery assembly.
  8. If all circuits test normal, replace the drive motor generator battery control module.
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