2003 Hummer H2FACTORY OEM SERVICE PROCEDURE

Installation Procedure

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Generator Control Module And Bracket.
    GM1816296Courtesy of GENERAL MOTORS CORP.
  1. If the generator control module was replaced. install the transaxle auxiliary pump control module. Refer to Auxiliary Fluid Pump Control Module Replacement .
    2. NOTE: Refer to Fastener Notice .
  2. Position the generator control module to the bracket, and install the generator control module bracket to module bolts.

    Tighten:  Tighten the bolts to 10 N.m (89 lb in).

    3. Fig 2: Generator Control Module Bracket Bolt And Nuts
    GM1816294Courtesy of GENERAL MOTORS CORP.
  3. Install the generator control module (with bracket) to the vehicle.
  4. Install the generator control module bracket bolt and nuts.

    Tighten:  Tighten the bolt/nuts to 10 N.m (89 lb in).

    5. Fig 3: Generator Control Module Ground Strap Nut
    GM1831322Courtesy of GENERAL MOTORS CORP.
  5. Install the generator control module ground strap to the stud and install the ground strap nut to the module.

    Tighten:  Tighten the nut to 10 N.m (89 lb in).

    6. Fig 4: Locating Engine Wiring Harness Electrical Connector
    GM1816297Courtesy of GENERAL MOTORS CORP.
  6. Connect the engine wiring harness electrical connector (1) to the transaxle auxiliary pump.
    7. Fig 5: Generator Control Module Coolant Hose And Clamp
    GM1816290Courtesy of GENERAL MOTORS CORP.
  7. Install the generator control module coolant hose to the generator control module.
  8. Position the generator control module coolant hose clamp (1) at the generator control module.
  9. Install the radiator outlet hose to the generator control module.
  10. Position the radiator outlet hose clamp at the generator control module.
    11. Fig 6: Generator Control Module 3-Phase Cable Terminal Block Nuts
    GM1824554Courtesy of GENERAL MOTORS CORP.
  11. Place a NEW terminal block seal onto the generator control module.
  12. Install the generator control module 3-phase cable terminal block to the generator control module.
  13. Install the generator control module 3-phase cable terminal block nuts to the generator control module.

    Tighten:  Tighten the nuts to 8 N.m (71 lb in).

    14. Fig 7: Positive Battery Cable Nuts
    GM1824553Courtesy of GENERAL MOTORS CORP.
  14. Place a NEW terminal block seal onto the generator control module.
  15. Unsecure, position and install the 36-volt terminal block to the generator control module.
  16. Install the 36-volt terminal block nuts (1) to the generator control module.

    Tighten:  Tighten the nuts to 10 N.m (89 lb in).

  17. Install the 36-volt positive battery cable nut (2) to the generator control module.

    Tighten:  Tighten the nut to 10 N.m (89 lb in).

  18. Install the 12-volt positive battery cable nut (5) from the generator control module.

    Tighten:  Tighten the nut to 10 N.m (89 lb in).

    19. Fig 8: Generator Control Module 3-Phase Cable Nuts
    GM1824552Courtesy of GENERAL MOTORS CORP.
  19. Install the generator control module 3-phase cable nuts at the generator control module.

    Tighten:  Tighten the nuts to 8 N.m (71 lb in).

    20. Fig 9: Generator Control Module Cover Bolts And Cover
    GM1816289Courtesy of GENERAL MOTORS CORP.
  20. Install the generator control module cover and bolts.

    Tighten:  Tighten the bolts to 10 N.m (89 lb in).

    21. Fig 10: Engine Wiring Harness Electrical Connectors
    GM1816292Courtesy of GENERAL MOTORS CORP.
  21. Connect the 2 engine wiring harness electrical connectors to the generator control module.
    22. Fig 11: 3-Phase Voltage Cable Bracket And Bolt
    GM1810869Courtesy of GENERAL MOTORS CORP.
  22. Install the generator control module 3-phase cable bracket bolt at the tie bar.

    Tighten:  Tighten the bolt to 10 N.m (89 lb in).

  23. Install the (12-volt) battery tray. Refer to Battery Tray Replacement (2.2L (L61)) or Battery Tray Replacement (2.4L (LAT)) or Battery Tray Replacement (3.5L (L66)) .
  24. Connect the hybrid battery. Refer to Hybrid Battery Service Disconnect/Connect .
  25. If the generator control module was replaced, program the NEW module. Refer to Control Module References .
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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