LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2002 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1445 (Hybrid Control System) >> Repair Instructions >> Generator Control Module Replacement >> Removal Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Removal 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: 3-Phase Voltage Cable Bracket And Bolt
    GM1810869Courtesy of GENERAL MOTORS CORP.
  1. Disconnect the hybrid battery. Refer to Hybrid Battery Service Disconnect/Connect .
  2. Remove 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)) .
  3. Remove the generator control module 3-phase cable bracket bolt at the tie bar.
    4. Fig 2: Engine Wiring Harness Electrical Connectors
    GM1816292Courtesy of GENERAL MOTORS CORP.
    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.
  4. Disconnect the 2 engine wiring harness electrical connectors (1) from the generator control module.
  5. WAIT at least 5 minutes in order to allow the voltage stored in the generator control module to discharge.
    6. Fig 3: Generator Control Module Cover Bolts And Cover
    GM1816289Courtesy of GENERAL MOTORS CORP.
  6. Remove the generator control module cover bolts and cover.
  7. The generator control module will have to be checked for voltage potential using a voltmeter. First, verify that the voltmeter works:
    1. Set the voltmeter to DC voltage.
    2. Measure the vehicle's 12-volt battery voltage.
    3. The meter should read greater than +12 volts DC.
    8. Fig 4: Identifying Generator Control Module Terminals
    GM1824550Courtesy of GENERAL MOTORS CORP.
  8. Now, check the generator control module for voltage potential, in order to ensure that the module has been disabled.
    1. Measure from the 36-volt positive terminal (3) to vehicle chassis ground (2). The voltage should be less than 3 volts.
    2. Measure from the 12-volt positive terminal (5) to vehicle chassis ground (2). The voltage should be less than 3 volts.
    3. Measure from the negative terminal (4) to vehicle chassis ground (2). The voltage should be less than 3 volts.
    9. 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.
  9. Verify that the generator control module 3-phase cables are disabled.
    1. Measure from each phase 1, 2, and 3 connection (1) to ground (2). The voltage should be less than 3 volts.
    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.
    10. Fig 5: Generator Control Module 3-Phase Cable Nuts
    GM1824552Courtesy of GENERAL MOTORS CORP.
  10. Remove the generator control module 3-phase cable nuts at the generator control module.
    11. Fig 6: Positive Battery Cable Nuts
    GM1824553Courtesy of GENERAL MOTORS CORP.
  11. Remove the 12-volt positive battery cable nut (5) from the generator control module.
  12. Remove the 36-volt positive battery cable nut (2) from the generator control module.
  13. Remove the 36-volt terminal block nuts (1) from the generator control module.
  14. Lift up, remove, and reposition the 36-volt terminal block, secure the block out of the way. Discard the terminal block seal.
  15. Remove the negative terminal nut (3) and battery positive cable fuse (4).
    16. Fig 7: Generator Control Module 3-Phase Cable Terminal Block Nuts
    GM1824554Courtesy of GENERAL MOTORS CORP.
  16. Remove the generator control module 3-phase cable terminal block nuts from the generator control module.
  17. Remove the generator control module 3-phase cable terminal block from the generator control module. Discard the terminal block seal.
    18. Fig 8: Generator Control Module Coolant Hose And Clamp
    GM1816290Courtesy of GENERAL MOTORS CORP.
  18. Reposition the radiator outlet hose clamp at the generator control module.
  19. Remove the radiator outlet hose from the generator control module.
  20. Reposition the generator control module coolant hose clamp (1) at the generator control module.
  21. Remove the generator control module coolant hose from the generator control module.
    22. Fig 9: Locating Engine Wiring Harness Electrical Connector
    GM1816297Courtesy of GENERAL MOTORS CORP.
  22. Disconnect the engine wiring harness electrical connector (1) from the transaxle auxiliary pump module
    23. Fig 10: Generator Control Module Ground Strap Nut
    GM1831322Courtesy of GENERAL MOTORS CORP.
  23. Remove the generator control module ground strap nut and strap from the module stud.
    24. Fig 11: Generator Control Module Bracket Bolt And Nuts
    GM1816294Courtesy of GENERAL MOTORS CORP.
  24. Remove the generator control module bracket bolt and nuts.
  25. Remove the generator control module (with bracket) from the vehicle.
    26. Fig 12: Generator Control Module And Bracket.
    GM1816296Courtesy of GENERAL MOTORS CORP.
  26. Place the generator control module assembly on a clean work surface.
  27. Remove the generator control module bracket to module bolts. Separate the generator control module from the bracket.
  28. If replacing the generator control module. remove the transaxle auxiliary pump control module. Refer to Auxiliary Fluid Pump Control Module Replacement .
scientia non olet · About LEMON Manuals