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.

Open the rear compartment.
Remove the black plastic OnStar® cover.

Fig 1: Removing Black Plastic OnStar® Cover
Courtesy of GENERAL MOTORS CORP.
Remove the communication interface module nuts.

Fig 2: Removing Communication Interface Module Nuts
Courtesy of GENERAL MOTORS CORP.
Adjust the assembly for access.
Disconnect the cellular antenna cable from the communication interface module by pulling outward on the square plastic housing.
Disconnect the 2 lower connectors from the module.
Disconnect the GPS antenna cable from the module by pulling outward on the circular metal sleeve.
Disengage the 2 large, plastic snap features at the inboard edge of the metal bracket, allowing the plastic bracket assembly to drop.
Push the plastic bracket assembly slightly outboard. Unhook the outboard plastic tabs.
Slide the plastic bracket assembly inboard, under the metal bracket. Remove the plastic bracket assembly from the metal bracket.

Fig 3: Removing Plastic Bracket Assembly From Metal Bracket
Courtesy of GENERAL MOTORS CORP.
On bottom side of plastic bracket assembly, directly below the 2 large, plastic snap features, locate the under cut edge. Pull this under cut edge outward, up and over the side of the module.

Fig 4: Pulling Under Cut Edge Outward, Up & Over Side Of Module
Courtesy of GENERAL MOTORS CORP.
Note the orientation of the module in the plastic bracket for installation. Slide the module out of the plastic bracket.

Fig 5: Removing Communication Interface Module From Plastic Bracket
Courtesy of GENERAL MOTORS CORP.