CTS V6-2.8L (2006)
Global Positioning System Module: Service and Repair
COMMUNICATION INTERFACE MODULE REPLACEMENT
REMOVAL PROCEDURE
1. Remove the right rear compartment trim.
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(R) 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.
2. Remove the nuts (2) securing the OnStar(R) module (1) to the vehicle body.
3. Disconnect all the electrical connectors from the module.
4. Remove the module from the vehicle.
INSTALLATION PROCEDURE
1. When replacing the VCIM, record the 11-digit electronic serial number (ESN) and the 10-digit station identification (STID) number from the label
on the new VCIM.
2. Reconnect the electrical connectors the module.
3. Install the module onto the vehicle.
