Body Control Module: Service and Repair

BODY CONTROL MODULE REPLACEMENT

REMOVAL PROCEDURE
1. Disconnect the negative battery cable.
2. Remove the front floor console.




3. Remove the wiring harness rosebud from the right center support bracket.




4. Pull back the carpet at the bottom of the support bracket and remove the lower nuts.
5. Remove the nuts and remove the bracket.




6. Disconnect the small body harness connector (1) from the body control module (BCM).
7. Disconnect the large body harness connector (2) from the BCM.




8. Disconnect the small instrument panel (I/P) wiring harness connector (1) from the BCM.
9. Disconnect the large I/P wiring harness connector (2) from the BCM.
10. If equipped with Onstar, disconnect the OnStar connector.




11. Remove the BCM nuts and remove the BCM from the vehicle.

INSTALLATION PROCEDURE




1. Install the BCM to the vehicle and install the retaining nuts.

NOTE: 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 the nuts to 10 Nm (88 lb in).




2. Connect the large I/P wiring harness connector (2) to the BCM.
3. Connect the small I/P wiring harness connector (1) to the BCM.




4. Connect the large body wiring harness connector (2) to the BCM.
5. Connect the small body wiring harness connector (1) to the BCM.
6. Connect the OnStar(R) connector.




7. Pull back the carpet and position the center support bracket into position.
8. Install the center support bracket nuts.

Tighten the nuts to 10 Nm (88 lb in).




9. Install the wiring harness rosebud to the center support bracket.
10. Install the front floor console.
11. Connect the negative battery cable.
12. Program a new or a remanufactured BCM. Programming and Relearning