GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2007 🢒 VUE - FWD 🢒 Hybrid 🢒 Hybrid Energy Storage 🢒 175 Amp Mega Fuse Replacement

Removal Procedure

    Object Number: 1813960 Size: SH
  1. Disconnect the hybrid battery. Refer to Hybrid Battery Service Disconnect/Connect .
  2. Remove the engine wiring harness auxiliary bussed electrical center (BEC) (1) from the wiring harness relay block bracket.
  3. Remove the engine wiring harness clip (2) from the positive battery cable bracket.
  4. Reposition the engine wiring harness auxiliary BEC (1) out of the way.

    5. Object Number: 1814045 Size: SH
  5. Remove the underhood bussed electrical center (UBEC) cover (1).
  6. Remove the positive battery cable lead to UBEC nut and remove the 3 positive cables from the stud.
  7. Loosen the UBEC bolts (2), once loose, tap the bolts once, in order to disengage the bolt from the electrical connectors.
  8. Disconnect the 3 electrical connectors from the rear of the UBEC. Note the color and location of each connector.
  9. Disengage the UBEC retaining tabs on the 4 corners and remove the UBEC.

    10. Object Number: 1813958 Size: SH
  10. Remove the forward lamp wiring harness electrical connector (1) from the positive battery cable bracket.

    11. Object Number: 1814035 Size: SH
  11. Remove the forward lamp wiring harness clips (2) from the positive battery cable bracket.
  12. Remove the forward lamp wiring harness UBEC electrical connector (1) from the UBEC bracket and secure out of the way.

    13. Object Number: 1814036 Size: SH
  13. Remove the engine wiring harness clip (2) from the battery tray.
  14. Remove the engine wiring harness UBEC electrical connector (1) from the UBEC bracket and secure out of the way.

    15. Object Number: 1814033 Size: SH
  15. Remove the forward lamp wiring harness electrical connector (2) from the battery tray.
  16. Remove the body wiring harness UBEC electrical connector (1) from the UBEC bracket and secure out of the way.

    17. Object Number: 1820891 Size: SH
  17. Remove the 12-volt positive battery cable clips (4) from the UBEC bracket.
  18. Remove the 12-volt positive battery cable clip (3) from the positive battery cable bracket.

    19. Object Number: 1814038 Size: SH
  19. Remove the UBEC bracket bolts (1) and bracket.

    20. Object Number: 1816288 Size: SH
  20. Remove the air conditioning compressor and condenser hose nut (1) from the generator control module bracket stud.
  21. Remove the positive battery cable bracket (2) from the stud.

    22. Object Number: 1813962 Size: SH
  22. Remove the engine control module (ECM) bracket from the battery hold down bracket and reposition out of the way.
  23. Remove the battery hold down bracket nuts (1, 4).
  24. Remove the wiring harness relay block bracket nut (3) and bracket (2).
  25. Remove the battery hold down retainer (5).

    26. Object Number: 1815938 Size: SH
  26. Remove the generator control module bracket bolts and stud.
  27. Remove the generator control module bracket.

    28. Object Number: 1810869 Size: SH
  28. Remove the generator control module 3-phase cable bracket to tie bar bolt.

    29. 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.

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

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

    32. Object Number: 1864864 Size: SH
  32. The generator control module will have to be checked for voltage potential using a voltmeter. First, verify that the voltmeter works:
    33. 32.1. Set the voltmeter to DC voltage.
    32.2. Measure the vehicle's 12-volt battery voltage.
    32.3. The meter should read greater than +12 volts DC.
  33. Now, check the generator control module for voltage potential, in order to ensure that the module has been disabled.
    34. 33.1. Measure from the 36-volt positive terminal (3) to a known good chassis ground. The voltage should be less than 3 volts.
    33.2. Measure from the 12-volt positive terminal (4) to a known good chassis ground. The voltage should be less than 3 volts.
    33.3. Measure from the ground terminal to 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.

  34. Verify that the generator control module 3-phase cables are disabled.
    35. 34.1. Measure from each phase 1, 2, and 3 connection (1) to a known good chassis ground. The voltage should be less than 3 volts.
    34.2. After verifying that there is no voltage present, the battery positive fuse can now be removed from the generator control module.

    Object Number: 1831557 Size: SH
  35. Remove the 12-volt positive battery cable nut (1) from the generator control module.
  36. Remove the 12-volt positive battery cable bolt (2) from the generator control module.
  37. Remove the 12-volt positive battery cable from the generator control module.

    38. Object Number: 1824555 Size: SH
  38. Remove the battery positive cable fuse nut.
  39. Remove the battery positive cable fuse from the generator control module.

Installation Procedure

    Object Number: 1824555 Size: SH
  1. Install the battery positive cable fuse to the generator control module.
  2. Loosely install the battery positive cable fuse nut.

    3. Object Number: 1831557 Size: SH
  3. Install the 12-volt positive battery cable to the generator control module.

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

  4. Install the 12-volt positive battery cable bolt (2) to the generator control module.

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

  5. Install the 12-volt positive battery cable nut (1) to the generator control module.

    6. Tighten
    Tighten the fuse and 12-volt positive battery cable nuts to 10 N·m (89 lb in).


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

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


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

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

    9. Object Number: 1815938 Size: SH
  9. Install the generator control module bracket.
  10. Install the generator control module bracket bolts and stud.

    11. Tighten
    Tighten the bolts/stud to 10 N·m (89 lb in).


    Object Number: 1813962 Size: SH
  11. Install the battery hold down retainer (5).
  12. Install the battery hold down bracket nuts (1, 4).

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

  13. Install the wiring harness relay block bracket (2) and nut (3).

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

  14. Position and install the ECM bracket to the battery hold down bracket.

    15. Object Number: 1816288 Size: SH
  15. Install the positive battery cable bracket (2) to the stud.
  16. Install the air conditioning compressor and condenser line nut (1) to the generator control module bracket stud.

    17. Tighten
    Tighten the nut to 20 N·m (15 lb ft).


    Object Number: 1814038 Size: SH
  17. Install the UBEC bracket, align the locator pin (2) with the hole in the battery tray.
  18. Install the UBEC bracket and bolts (1).

    19. Tighten
    Tighten the bolts to 9 N·m (80 lb in).


    Object Number: 1820891 Size: SH
  19. Install the 12-volt positive battery cable clips (4) to the UBEC bracket.
  20. Install the 12-volt positive battery cable clip (3) to the positive battery cable bracket.

    21. Object Number: 1814033 Size: SH
  21. Position and install the body wiring harness UBEC electrical connector (1) to the UBEC bracket.

    22. Object Number: 1814036 Size: SH
  22. Position and install the engine wiring harness UBEC electrical connector (1) to the UBEC bracket.
  23. Install the engine wiring harness clip (2) to the battery tray.

    24. Object Number: 1814035 Size: SH
  24. Position and install the forward lamp wiring harness UBEC electrical connector (1) to the UBEC bracket.
  25. Install the forward lamp wiring harness clips (2) to the positive battery cable bracket.

    26. Object Number: 1813958 Size: SH
  26. Install the forward lamp wiring harness electrical connector (1) to the positive battery cable bracket.

    27. Object Number: 1814045 Size: SH
  27. Install the UBEC.
  28. Connect the 3 electrical connectors to the rear of the UBEC. Ensure that the color and location of each connector is correct.
  29. Tighten the UBEC bolts (2).

    30. Tighten
    Tighten the bolts to 4 N·m (35 lb in).

  30. Install the 3 positive cables to the UBEC stud and install the positive battery cable lead nut.

    31. Tighten
    Tighten the nut to 15 N·m (11 lb ft).

  31. Install the UBEC cover (1).

    32. Object Number: 1813960 Size: SH
  32. Position and install the engine wiring harness auxiliary BEC (1) to the wiring harness relay block bracket.
  33. Install the engine wiring harness clip (2) to the positive battery cable bracket.
  34. Connect the hybrid battery. Refer to Hybrid Battery Service Disconnect/Connect .