Removal Procedure

WARNING: This page is about a different car, the 2006 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

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.

Open the rear compartment.
Remove the communication interface module screws.

Fig 1: View Of Electrical Connectors, Coaxial Antenna Cable & Communication Interface Module

Courtesy of GENERAL MOTORS CORP.

Disconnect the mobile telephone antenna cable from the communication interface module by pulling outward on the square plastic housing.
Disconnect the electrical connectors.
Disconnect the navigation antenna coaxial antenna cable from the module.
Remove the communication interface module.