Removal Procedure
- Remove the right rear compartment trim. Refer to Compartment Trim Panel Replacement - Rear in Body Rear End.
- Remove the nuts (2) securing the OnStar® module (1) to the vehicle body.
- Disconnect all the electrical connectors from the module.
- Remove the module from the vehicle.
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.
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.
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.