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Removal Procedure

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. Disable the high voltage system. Refer to High Voltage Disabling .
  2. Remove the high voltage disconnect circuit cover. Refer to High Voltage Disconnect Circuit Connector Cover Replacement .
  3. Remove the high voltage battery disconnect control module. Refer to High Voltage Battery Disconnect Control Module Module Replacement (with quick charge)  and High Voltage Battery Disconnect Control Module Module Replacement (without quick charge) .
  4. Remove the drive motor generator power inverter module. Refer to Drive Motor Power Inverter Module Replacement .
  5. Remove the generator control module coolant hose at the front of the APM module. Refer to Generator Control Module Coolant Hose Replacement (PE From APM TO TPIM) .
  6. Disconnect the engine harness connector (1) from the accessory DC power control (APM) module (2).
    Fig 1: Engine Harness Connector And Accessory DC Power Control (APM) Module
    GM3239594Courtesy of GENERAL MOTORS COMPANY
  7. Remove the APM ground cable fastener (2) and remove the APM ground cable (1), from the APM module.
    Fig 2: APM Ground Cable Fastener
    GM3232234Courtesy of GENERAL MOTORS COMPANY
  8. Disconnect the 2-stage high voltage connectors in the following sequence:
    Fig 3: First Stage Connector Tab And Connector Retaining Tabs
    GM3794632Courtesy of GENERAL MOTORS COMPANY
    • Push down on the connector tab and release the connector from the first stage connector tab (1).
    • Using a flat blade screwdriver inserted into the connector as shown, release the second stage safety catch, from the 2 connector retaining tabs (2).
  9. Remove the APM cable connector (1) on the right side of the APM module (2).
    Fig 4: APM Cable Connector
    GM3232231Courtesy of GENERAL MOTORS COMPANY
  10. Remove the drive motor generator control module cooling outlet hose (Straight Hose) at the rear of the APM module. Refer to Drive Motor Generator Control Module Cooling Outlet Hose Replacement (Auxiliary Radiator to Drive Motor Battery Charger) , Drive Motor Generator Control Module Cooling Outlet Hose Replacement (Long Hose) , Drive Motor Generator Control Module Cooling Outlet Hose Replacement (Two Bending) and Drive Motor Generator Control Module Cooling Outlet Hose Replacement (Straight Hose) .
  11. Remove the battery positive cable cover (1) and remove the battery positive cable fastener (2) from the left front side of the APM module (4).
    Fig 5: Removing Protective Boot On Battery Positive Cable
    GM2917960Courtesy of GENERAL MOTORS COMPANY
  12. Remove the battery positive cable (3) from the APM module.
  13. Remove the APM module retainer tray fasteners (1) and remove the retainer tray brackets (2).
    Fig 6: APM Module Retainer Tray Fasteners
    GM3232233Courtesy of GENERAL MOTORS COMPANY
    NOTE: Note the orientation of the retainer tray brackets.
  14. Unclip the APM module (4) from the retainer clip (1) and remove the APM module from the vehicle.
    Fig 7: APM Module And Retainer Clip
    GM3232228Courtesy of GENERAL MOTORS COMPANY
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