Removal Procedure
- Remove the rear shelf trim. Refer to Trim Panel Replacement - Rear Window Shelf (Early Production) in Interior Trim.
- Remove the interface module from the bracket by pulling back on the bracket tabs.
- Disconnect the electrical harnesses and the antenna cable.
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. In addition, the station identification and the electronic serial number information on the generation 5 label cannot be used to update customer account information if the module is replaced. You must use a scan tool to access this information.
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, the station identification and the electronic serial number information on the generation 5 label cannot be used to update customer account information if the module is replaced. You must use a scan tool to access this information.