Removal Procedure

WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Communication Interface Module

Courtesy of GENERAL MOTORS CORP.

NOTE: 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 (STID) and the 11-digit electronic serial number (ESN), 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 right rear compartment trim. Refer to Rear Compartment Trim Panel Replacement .
Remove the nuts securing the OnStar® module to the vehicle body.

Fig 2: View Of OnStar(R) Module

Courtesy of GENERAL MOTORS CORP.

Disconnect all the electrical connectors from the module.
Remove the module from the vehicle.