Envoy 2WD V8-5.3L VIN P (2004)
Navigation Module: Service and Repair
Communication Interface Module (TrailBlazer EXT, Envoy XL)
COMMUNICATION INTERFACE MODULE REPLACEMENT
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(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.
1. Position the right rear seat bottom to a cargo position.
2. Remove the protective cover from the vehicle communication interface module (VCIM).
3. Remove the module from the upper bracket by releasing the retaining tab.
