GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2005 🢒 Century 🢒 Body 🢒 Lighting Systems 🢒 Underhood Electrical Center or Junction Block Replacement

Removal Procedure

    Object Number: 289343 Size: SH
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  2. Release and reposition the remote positive battery cable stud cover.
  3. Remove the nut retaining the positive battery cable lead to the underhood accessory wiring junction block, then reposition the cable lead away from the junction block.

    4. Object Number: 321480 Size: SH
  4. Release the coolant recovery tank hose retainer from the junction block.
  5. Release the four tabs retaining the junction block to the junction block retainer and reposition the junction block.

    6. Object Number: 321477 Size: SH
  6. Disconnect the instrument panel (IP) wiring harness individual connectors from the junction block.

    7. Object Number: 321473 Size: SH
  7. Loosen the bolts retaining the engine, IP and forward lamp wiring harness connectors to the junction block.
  8. Disconnect the engine wiring harness connector from the junction block.

    9. Object Number: 321469 Size: SH
  9. Disconnect the IP wiring harness connector from the junction block.

    10. Object Number: 321458 Size: SH
  10. Disconnect the forward lamp wiring harness connector from the junction block.

    11. Object Number: 321442 Size: SH
  11. If accessory wiring junction block retainer removal is necessary, perform the following:
    12. 11.1. Release the positive battery cable lead retainers from the junction block retainer, then reposition the cable lead away from the retainer.
    11.2. Remove the nut retaining the junction block retainer to the strut tower.
    11.3. Lift the junction block retainer to release the lower tab and remove the retainer from the vehicle.

Installation Procedure

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.


    Object Number: 321442 Size: SH
  1. If accessory wiring junction block retainer installation is necessary, perform the following:
    2. 1.1. Position the junction block retainer to the strut tower and insert the lower tab on the retainer to the slot on the tower.
    1.2. Install the junction block retainer to strut tower nut.

    Tighten
    Tighten the underhood accessory wiring junction block retainer to strut tower nut to 3 N·m (27 lb in).

    1.3. Position the positive battery cable lead end through the slot in the junction block retainer, then secure the cable retainers.

    Object Number: 321458 Size: SH
  2. Connect the forward lamp wiring harness connector to the junction block.

    3. Object Number: 321469 Size: SH
  3. Connect the IP wiring harness connector to the junction block.

    4. Object Number: 321473 Size: SH
  4. Connect the engine wiring harness connector to the junction block.
  5. Tighten the bolts retaining the engine, IP and forward lamp wiring harness connectors to the junction block.

    6. Tighten
    Tighten the wiring harness connectors to underhood accessory wiring junction block retaining bolts to 7 N·m (62 lb in).


    Object Number: 321477 Size: SH
  6. Connect the IP wiring harness individual connectors to the junction block.

    7. Object Number: 321480 Size: SH
  7. Position the wiring harnesses and the accessory wiring junction block to the junction block retainer, align the four retaining tabs and press into place to secure the junction block.
  8. Secure the coolant recovery tank hose retainer to the junction block.

    9. Object Number: 289343 Size: SH
  9. Install the positive battery cable lead to the stud on the underhood accessory wiring junction block, then install the cable lead retaining nut.

    10. Tighten
    Tighten the positive battery cable lead to underhood accessory wiring junction block retaining nut to 10 N·m (89 lb in).

  10. Install the remote positive battery cable stud cover.
  11. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.