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.

Important:  This vehicle may be equipped with one of two versions of the OnStar® System.

Fig 1: Removing Nuts Securing OnStar® Module To Vehicle Body

Courtesy of GENERAL MOTORS CORP.

Early production vehicles will have the generation 4 module and later productions will have the generation 5 module. The two modules cannot be interchanged. The generation 4 module can be identified by the use of three connector cavities. The generation 5 module uses four connector cavities. In addition, if you replace the module the station identification and the electronic serial number information on the generation 5 label cannot be used to update customer account information. You must use a scan tool to access this information.

1. Remove the right rear compartment trim. Refer to COMPARTMENT TRIM PANEL REPLACEMENT -- REAR in Body Rear End.
2. Remove the nuts (2) securing the OnStar® module (1) to the vehicle body.
3. Disconnect all the electrical connectors from the module.
4. Remove the module from the vehicle.
   Fig 2: Disconnecting Electrical Connectors From Module

   Courtesy of GENERAL MOTORS CORP.