GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Chevy C Silverado - 2WD 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Underhood Fuse Block Replacement

Removal Procedure

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.
  2. Remove the left rear fender brace. Refer to Front Fender Replacement in Body Front End.

    3. Object Number: 396416 Size: SH
  3. Remove the underhood bussed electrical center (UBEC) cover.

    4. Object Number: 368390 Size: SH
  4. Remove the positive battery cable bolt from the UBEC.

    5. Object Number: 396463 Size: SH
  5. Remove the chassis harness from the UBEC.

    6. Object Number: 396460 Size: SH
  6. Unsnap the UBEC from the bracket and pivot upward to access the connectors.
  7. Remove the forward lamp harness (32 way) connector from the UBEC.

    8. Object Number: 396470 Size: SH
  8. Remove the instrument panel harness (68 way) connector and the instrument panel harness (2 way) connector from the UBEC.

    9. Object Number: 396474 Size: SH
  9. Remove the engine harness (68 way) connector and the engine harness (1 way) connector from the UBEC.

    10. Object Number: 396477 Size: SH
  10. Remove the chassis harness (32 way) connector and the chassis harness (2 way) connector from the UBEC.

    11. Object Number: 396459 Size: SH
  11. Unsnap and remove the UBEC from the mounting bracket.

Installation Procedure

    Object Number: 396459 Size: SH
  1. Snap the UBEC into the mounting bracket.

    2. 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: 396477 Size: SH
  2. Install the chassis harness (32 way) connector and the chassis harness (2 way) connector to the UBEC.

    3. Tighten
    Tighten the bolt to 6 N·m (53 lb in).


    Object Number: 396474 Size: SH
  3. Install the engine harness (68 way) connector and the engine harness (1 way) connector to the UBEC.

    4. Tighten
    Tighten the bolt to 6 N·m (53 lb in).


    Object Number: 396470 Size: SH
  4. Install the instrument panel harness (68 way) connector and the instrument panel harness (2 way) connector to the UBEC.

    5. Tighten
    Tighten the bolt to 6 N·m (53 lb in).


    Object Number: 396460 Size: SH
  5. Install the forward lamp harness (32 way) connector to the UBEC.

    6. Tighten
    Tighten the bolt to 6 N·m (53 lb in).

  6. Snap the UBEC to the bracket to close.

    7. Object Number: 396463 Size: SH
  7. Install the chassis harness to the UBEC.

    8. Tighten
    Tighten the bolt to 6 N·m (53 lb in).


    Object Number: 368390 Size: SH
  8. Install the positive battery cable bolt to the UBEC.

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


    Object Number: 396416 Size: SH
  9. Install the underhood bussed electrical center (UBEC) cover.
  10. Install the left rear fender brace. Refer to Front Fender Replacement in Body Front End.
  11. Connect the negative battery cable.

    12. Tighten
    Tighten the bolt to 17 N·m (13 lb ft).