Removal Procedure
- Disconnect the battery negative cable.
- If replacing the rear electrical center on a Chevrolet TrailBlazer EXT or GMC Envoy XL, remove the left second row seat. Refer to Rear Seat Replacement in Seats.
- If replacing the rear electrical center on a Chevrolet TrailbBlazer, GMC Envoy or Oldsmobile Bravada, position the left second row seat to a cargo position.
- Remove the rear electrical center cover.
- Remove the battery feed terminal nut (2) from the junction block.
- Remove the body control module (BCM) from the rear electrical center. Refer to Body Control Module Replacement in Body Control System.
- Fully loosen the 3 bolts (1) that retain the junction block to the electrical connectors.
- Release the tabs that retain the junction block to the block base.
- Remove the junction block from the block base.
- Disconnect the instrument panel harness connector (1) from the junction block.
- Disconnect the mobile telephone harness connector (1) from the junction block.
- Disconnect the body wiring harness connector (1) from the junction block.
- Disconnect the headliner harness connector (2) from the junction block.
- Disconnect the console harness connector from the junction block.
- Remove the block base retaining nuts from the floor studs.
- Remove the block base from the floor panel.
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.
Installation Procedure
- Install the block base to the floor studs.
- Install the block base retaining nuts to the floor studs.
- Connect the console harness connector to the block base.
- Connect the headliner harness connector (2) to the block base.
- Connect the body wiring harness connector (1) to the block base.
- Connect the mobile telephone harness connector (1) to the junction block.
- Connect the instrument panel harness connector (1) to the block base.
- Install the junction block to the block base.
- Install the 3 bolts (1) that retain the junction block to the block base.
- Install the BCM to the rear electrical center. Refer to Body Control Module Replacement in Body Control System.
- Install the battery feed terminal nut (2) to the junction block.
- Install the rear electrical center cover.
- If replacing the rear electrical center on a Chevrolet TrailBlazer, GMC Envoy or Oldsmobile Bravada, position the left second row seat to a passenger position.
- If replacing the rear electrical center on a Chevrolet TrailBlazer EXT or GMC Envoy XL, install the left second row seat. Refer to Rear Seat Replacement in Seats.
- Connect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
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.
Tighten
Tighten the block base retaining nuts to 10 N·m (88 lb in).
Ensure that the retaining tabs are fully seated.
Tighten
Tighten the 3 bolts to 3.5 N·m (31 lb in).
Tighten
Tighten the battery feed terminal nut to 10 N·m (88 lb in).
