Important: The vehicle communication interface module (VCIM) has a specific set of unique numbers that tie the module to each vehicle. These numbers, the 10-digit station identification and the 11-digit electronic serial number, are used by the National Cellular Network and OnStar® to identify the specific vehicle. Because these numbers are tied to the vehicle identification number of the vehicle, you must never exchange these parts with those of another vehicle.

1. Remove the right insulator panel. Refer to Instrument Panel Insulator Panel Replacement - Right Side .



2. Remove the screws securing the VCIM bracket to the instrument panel metal brace.



3. Disconnect the electrical connectors.
4. Disconnect the cell antenna coaxial cable from the VCIM.

Important: The old VCIM must be returned for core credit.

5. Remove the VCIM from the bracket and the vehicle.

1. When replacing a VCIM, record the 11-digit electronic serial number (ESN) and the 10-digit station identification (STID) number from the label on the new VCIM.



2. Connect the electrical connectors to the module.
3. Connect the cell antenna coaxial cable to the VCIM.

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.

4. Install the screws that secure the bracket to the instrument panel brace.

Tighten
Tighten the screws to 10 N·m (89 lb in).

5. Install the right insulator panel. Refer to Instrument Panel Insulator Panel Replacement - Right Side .

Important: After replacing the vehicle communication interface module, you must reconfigure the OnStar® system. Failure to reconfigure the system will result in an additional customer visit for repair. In addition, pressing and holding the white dot button on the keypad will NOT reset this version of the OnStar® system. This action will cause a DTC to set.

6. Reconfigure the OnStar® system. Refer to Control Module References for programming and setup information.