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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: Identifying Hybrid-Related Harness Retainers
    GM1820895Courtesy of GENERAL MOTORS CORP.
  1. Disconnect the hybrid battery. Refer to Hybrid Battery Service Disconnect/Connect .
  2. Remove the 36 volt positive battery cable clip (4) from the engine control module (ECM) bracket.
    3. Fig 2: Identifying ECM Bracket And ECM
    GM1813961Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: It is not necessary to disconnect the engine wiring and body wiring harnesses electrical connectors from the ECM prior to repositioning. It is also not necessary to remove the ECM from the bracket prior to repositioning.
  3. Remove the ECM bracket (1) from the battery hold down bracket. Reposition the ECM bracket out of the way.
    4. Fig 3: Identifying Forward Lamp Wiring Harness Electrical Connector
    GM1813958Courtesy of GENERAL MOTORS CORP.
  4. Remove the forward lamp wiring harness electrical connector (1) from the positive battery cable bracket.
    5. Fig 4: View Of Engine Wiring Harness Auxiliary Bussed Electrical Center (BEC)
    GM1813960Courtesy of GENERAL MOTORS CORP.
  5. Remove the engine wiring harness auxiliary bussed electrical center (BEC) (1) from the wiring harness relay block bracket.
  6. Remove the engine wiring harness clip (2) from the positive battery cable bracket.
  7. Reposition the engine wiring harness auxiliary BEC out of the way.
    8. Fig 5: Underhood Bussed Electrical Center (UBEC)
    GM1814045Courtesy of GENERAL MOTORS CORP.
  8. Remove the underhood bussed electrical center (UBEC) cover (1).
  9. Remove the positive battery cable lead to UBEC nut and remove the 3 positive cables from the stud.
  10. Loosen the UBEC bolts (2), once loose, tap the bolts once, in order the disengage the bolt from the electrical connector
  11. Disconnect the 3 electrical connectors from the rear of the UBEC. Note the color and location of each connector
  12. Disengage the UBEC retaining tabs on the 4 corners and remove the UBEC
    13. Fig 6: Forward Lamp Wiring Harness Electrical Connector And UBEC Electrical Connector
    GM1814033Courtesy of GENERAL MOTORS CORP.
  13. Remove the body wiring harness UBEC electrical connector (1) from the UBEC bracket.
  14. Reposition the body wiring harness electrical connector out of the way
    15. Fig 7: Forward Lamp Wiring Harness Clips And Ubec Electrical Connector
    GM1814035Courtesy of GENERAL MOTORS CORP.
  15. Remove the forward lamp wiring harness UBEC electrical connector (1) from the UBEC bracket.
  16. Remove the forward lamp wiring harness clips (2) from the positive battery cable bracket.
  17. Reposition the forward lamp wiring harness electrical connector out of the way.
    18. Fig 8: View Of Clip And UBEC Connector
    GM1814036Courtesy of GENERAL MOTORS CORP.
  18. Remove the engine wiring harness UBEC electrical connector (1) from the UBEC bracket
  19. Remove the engine wiring harness clip (2) from the battery tray
  20. Reposition the engine wiring harness electrical connector out of the way
    21. Fig 9: Clips And Bolts
    GM1820891Courtesy of GENERAL MOTORS CORP.
  21. Remove the 12 volt positive battery cable clips (4) from the UBEC bracket
  22. Remove the 12 volt positive battery cable clip (3) from the positive battery cable bracket.
    23. Fig 10: UBEC Bracket And Bolts
    GM1814038Courtesy of GENERAL MOTORS CORP.
  23. Remove the UBEC bracket bolts (1) and bracket.
    24. Fig 11: Bracket And Nut
    GM1816288Courtesy of GENERAL MOTORS CORP.
  24. Remove the air conditioning compressor and condenser line nut (1) from the generator control module bracket stud.
  25. Remove the positive battery cable bracket (2) from the stud.
    26. Fig 12: Battery Hold Down Bracket And Retainers
    GM1813962Courtesy of GENERAL MOTORS CORP.
  26. Remove the battery hold down bracket nuts (1, 4).
  27. Remove the wiring harness relay block bracket nut (3) and bracket (2).
  28. Remove the battery hold down retainer (5)
    29. Fig 13: Generator Control Module Bracket, Bolts And Stud
    GM1815938Courtesy of GENERAL MOTORS CORP.
  29. Remove the generator control module bracket bolts and stud.
  30. Remove the generator control module bracket
    31. Fig 14: 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.
  31. Disconnect the 2 engine wiring harness electrical connectors (1) from the generator control module.
  32. WAIT at least 5 minutes in order to allow the voltage stored in the generator control module to discharge
    33. Fig 15: Generator Control Module Cover Bolts And Cover
    GM1816289Courtesy of GENERAL MOTORS CORP.
  33. Remove the generator control module cover bolts and cover.
    34. Fig 16: Identifying Generator Control Module Terminals
    GM1864864Courtesy of GENERAL MOTORS CORP.
  34. 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.
  35. 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 a known good chassis ground. The voltage should be less than 3 volts.
    2. Measure from the 12-volt positive terminal (4) to a known good chassis ground. The voltage should be less than 3 volts
    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.
  36. Verify that the generator control module 3 Phase cables are disabled.

    Measure from the phase 1, 2, and 3 connections to ground. The voltage should be less than 3 volts.

    37. Fig 17: Positive Battery Cable Nut And Bolt
    GM1831557
  37. Remove the 12 volt positive battery cable nut (1) at the generator control module
  38. Remove the 12 volt positive battery cable bolt (2) at the generator control module
  39. Remove the 12 volt positive battery cable from the generator control module.
    40. Fig 18: Clips And Bolts
    GM1820891Courtesy of GENERAL MOTORS CORP.
  40. Reposition the body wiring harness junction block protector.
  41. Remove the positive battery cable lead nut (1) at the UBEC stud.
  42. Remove the 12 volt positive battery cable lead (2) from the UBEC stud.
  43. Remove the 12 volt positive battery cable clips (4) from the UBEC.
  44. Remove the 12 volt positive battery cable clip (3) from the positive battery cable bracket.
  45. Remove the 12 volt positive battery cable from the vehicle.
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