GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2007 🢒 VUE - FWD 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Generator Control Module Replacement

Removal Procedure

    Object Number: 1810869 Size: SH
  1. Disconnect the hybrid battery. Refer to Hybrid Battery Service Disconnect/Connect .
  2. Drain the cooling system. Refer to Cooling System Draining and Filling .
  3. Remove the (12-volt) battery tray. Refer to Battery Tray Replacement .
  4. Remove the generator control module 3-phase cable bracket bolt at the tie bar.

    5. Object Number: 1816292 Size: SH

    Caution: To help avoid personal injury, additional precautions must be taken prior to working on the generator control module or the generator starter. After removing the 36V battery cables from the generator battery, remove both engine wiring harness connectors from the generator control module. Wait at least 5 minutes and then remove the generator control module cover. Verify voltage levels at all 36V, 12V, and 3-phase connections, are less than 3 volts using a DMM before proceeding.

  5. Disconnect the 2 engine wiring harness electrical connectors (1) from the generator control module.
  6. WAIT at least 5 minutes in order to allow the voltage stored in the generator control module to discharge.

    7. Object Number: 1816289 Size: SH
  7. Remove the generator control module cover bolts and cover.

    8. Object Number: 1864864 Size: SH
  8. The generator control module will have to be checked for voltage potential using a voltmeter. First, verify that the voltmeter works:
    9. 8.1. Set the voltmeter to DC voltage.
    8.2. Measure the vehicle's 12-volt battery voltage.
    8.3. The meter should read greater than +12 volts DC.
  9. Now, check the generator control module for voltage potential, in order to ensure that the module has been disabled.
    10. 9.1. Measure from the 36-volt positive terminal (3) to a known good chassis ground. The voltage should be less than 3 volts.
    9.2. Measure from the 12-volt positive terminal (5) to a known good chassis ground. The voltage should be less than 3 volts.
    9.3. Measure from the ground terminal (2) to a known good chassis ground, checking for continuity.

    Caution: To help avoid personal injury, always treat the 3-phase cable and connectors as if voltage is present and as if the surface of all parts of the cable is hot.

  10. Verify that the generator control module 3-phase cables are disabled.
    11. 10.1. Measure from each phase 1, 2, and 3 connection (1) to a known good chassis ground. The voltage should be less than 3 volts.
    10.2. After verifying that there is no voltage present, the 12-volt and 36-volt positive battery cables, and the generator control module 3-phase cables can now be removed from the generator control module.

    Object Number: 1824552 Size: SH
  11. Remove the generator control module 3-phase cable nuts at the generator control module.

    12. Object Number: 1824553 Size: SH
  12. Remove the 12-volt positive battery cable nut (5) from the generator control module.
  13. Remove the 36-volt positive battery cable nut (2) from the generator control module.
  14. Remove the 36-volt terminal block nuts (1) from the generator control module.
  15. Lift up, remove, and reposition the 36-volt terminal block, secure the block out of the way. Discard the terminal block seal.
  16. Remove the negative terminal nut (3) and battery positive cable fuse (4).

    17. Object Number: 1824554 Size: SH
  17. Remove the generator control module 3-phase cable terminal block nuts from the generator control module.
  18. Remove the generator control module 3-phase cable terminal block from the generator control module. Discard the terminal block seal.

    19. Object Number: 1816290 Size: SH
  19. Reposition the radiator outlet hose clamp at the generator control module.
  20. Remove the radiator outlet hose from the generator control module.
  21. Reposition the generator control module coolant hose clamp (1) at the generator control module.
  22. Remove the generator control module coolant hose from the generator control module.

    23. Object Number: 1816297 Size: SH
  23. Disconnect the engine wiring harness electrical connector (1) from the transaxle auxiliary pump module

    24. Object Number: 1831322 Size: SH
  24. Remove the generator control module ground strap nut and strap from the module stud.

    25. Object Number: 1816294 Size: SH
  25. Remove the generator control module bracket bolt and nuts.
  26. Remove the generator control module (with bracket) from the vehicle.

    27. Object Number: 1816296 Size: SH
  27. Place the generator control module assembly on a clean work surface.
  28. Remove the generator control module bracket to module bolts. Separate the generator control module from the bracket.
  29. If replacing the generator control module. remove the transaxle auxiliary pump control module. Refer to Auxiliary Fluid Pump Control Module Replacement .

Installation Procedure

    Object Number: 1816296 Size: SH
  1. If the generator control module was replaced. install the transaxle auxiliary pump control module. Refer to Auxiliary Fluid Pump Control Module Replacement .

    2. Notice: Refer to Fastener Notice in the Preface section.

  2. Position the generator control module to the bracket, and install the generator control module bracket to module bolts.

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


    Object Number: 1816294 Size: SH
  3. Install the generator control module (with bracket) to the vehicle.
  4. Install the generator control module bracket bolt and nuts.

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


    Object Number: 1831322 Size: SH
  5. Install the generator control module ground strap to the stud and install the ground strap nut to the module.

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


    Object Number: 1816297 Size: SH
  6. Connect the engine wiring harness electrical connector (1) to the transaxle auxiliary pump.

    7. Object Number: 1816290 Size: SH
  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. Object Number: 1824554 Size: SH
  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.

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


    Object Number: 1824553 Size: SH
  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.

    17. 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.

    18. 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.

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


    Object Number: 1824552 Size: SH
  19. Install the generator control module 3-phase cable nuts at the generator control module.

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


    Object Number: 1816289 Size: SH
  20. Install the generator control module cover and bolts.

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


    Object Number: 1816292 Size: SH
  21. Connect the 2 engine wiring harness electrical connectors (1) to the generator control module.

    22. Object Number: 1810869 Size: SH
  22. Install the generator control module 3-phase cable bracket bolt at the tie bar.

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

  23. Install the (12-volt) battery tray. Refer to Battery Tray Replacement .
  24. Fill the cooling system. Refer to Cooling System Draining and Filling .
  25. Connect the hybrid battery. Refer to Hybrid Battery Service Disconnect/Connect .
  26. If the generator control module was replaced, program the NEW module. Refer to Control Module References .
  27. Using a Tech 2, command an autostart in order to verify that the system is working properly.