GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

    Caution: Refer to Battery Disconnect Caution in the Preface section.


    Object Number: 321480  Size: SH
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  2. Remove the battery positive cable from the top of the underhood accessory wiring junction block. Refer to Battery Cable Replacement in Engine Electrical.
  3. Remove the top cover of the underhood accessory wiring junction block by unscrewing the center knob if you access the fuses.

  4. Object Number: 321480  Size: SH
  5. Unsnap the retainer tabs in order to remove the junction block from the junction block bracket.

  6. Object Number: 321477  Size: SH
  7. Disconnect the three instrument panel wiring harness connectors.
  8. Loosen the bolts from the three connectors.

  9. Object Number: 321473  Size: SH
  10. Disconnect the engine wiring harness.

  11. Object Number: 321469  Size: SH
  12. Disconnect the instrument panel wiring harness.

  13. Object Number: 321458  Size: SH
  14. Disconnect the forward lamp wiring harness.
  15. Position all harnesses away from the junction block bracket.
  16. Release the positive battery cable from the junction block bracket retainers.

  17. Object Number: 321442  Size: SH
  18. Remove the accessory wiring junction block nut.
  19. Lift the junction block bracket up and out from the tab on the shock tower, if necessary.

Installation Procedure


    Object Number: 321442  Size: SH
  1. Insert the lower tab of the bracket into the shock tower slot, if necessary.
  2. Insert the top of the bracket over the stud on the shock tower.
  3. Install the accessory wiring junction block nut.
  4. Tighten
    Tighten the accessory wiring junction block nut to 3 N·m (27 lb in).

  5. Position the positive battery cable to the junction block bracket and secure using the retainers.

  6. Object Number: 321458  Size: SH
  7. Connect the forward lamp wiring harness.

  8. Object Number: 321469  Size: SH
  9. Connect the instrument panel wiring harness.

  10. Object Number: 321473  Size: SH
  11. Connect the engine wiring harness.
  12. Tighten the wiring harness connector bolts to the three connectors.
  13. Tighten
    Tighten the wiring harness connector bolts to 7 N·m (62 lb in).


    Object Number: 321477  Size: SH
  14. Connect the three instrument panel wiring harness connectors.

  15. Object Number: 321480  Size: SH
  16. Position the junction block into the junction block bracket.
  17. Snap the junction block to the bracket.
  18. Replace the top cover and tighten using the center knob if fuses were accessed.
  19. Install the battery positive cable to the top of the underhood accessory wiring junction block. Refer to Battery Cable Replacement in Engine Electrical.
  20. Install the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.