Removal Procedure

Fig 1: View Of Communication Interface Module (CIM) & Fastener

Courtesy of GENERAL MOTORS CORP.

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.

Remove the fastener located on the bottom of the OnStar® bracket.
Tilt the module inboard to the center of the vehicle and pull down the communication interface module (CIM)

Fig 2: View Of Electrical Connectors, GPS Antenna & Cellular Coax Cable

Courtesy of GENERAL MOTORS CORP.

Disconnect the electrical connectors, the GPS antenna, and the cellular coax cable.