Removal Procedure

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 rear compartment trim. Refer to COMPARTMENT TRIM PANEL REPLACEMENT - REAR in Body Rear End.
2. Disconnect the antenna (3) and electrical connections (2) from the vehicle communication interface module (VCIM).
3. Remove the bolts (1) securing the VCIM.
4. Remove the vehicle VCIM from the vehicle.

Fig 1: Removing Communication Interface Module

Courtesy of GENERAL MOTORS CORP.