GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2004 🢒 Regal 🢒 Accessories 🢒 Cellular Communication 🢒 Communication Interface Module Replacement

Removal procedure

    Object Number: 769971 Size: SH

    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.

  1. Open the rear compartment.
  2. Remove the communication interface module cover.

    3. Object Number: 769963 Size: SH
  3. Remove the bracket nuts from the communication interface module.
  4. Adjust the assembly for access.

    5. Object Number: 813766 Size: SH
  5. Disconnect the cellular antenna cable from the communication interface module.
  6. Disconnect the electrical connectors from the module.
  7. Disconnect the GPS antenna cable from the module.

    8. Object Number: 1364564 Size: SH
  8. Remove the bolts (1) from the communication interface module.
  9. Remove the communication interface module (2).

Installation Procedure

    Object Number: 1364564 Size: SH
  1. Record the 11-digit electronic serial number (ESN) and the 10-digit station identification (STID) number from the label on the new VCIM.
  2. Position the communication interface module to the bracket (2).

    3. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the bolts (1) to the communication interface module.

    4. Tighten
    Tighten the bolts to 10 N·m (89 lb in).

  4. Connect the GPS antenna cable to the module.

    5. Object Number: 813766 Size: SH
  5. Connect the electrical connectors to the module.
  6. Connect the cellular antenna cable to the module.

    7. Important: After replacing the communication interface module, you must reconfigure the OnStar® system. Failure to reconfigure the system will result in an additional customer visit for repair.

  7. Reconfigure the OnStar® system. Refer to OnStar Reconfiguration .

    8. Object Number: 769963 Size: SH
  8. Position the assembly to the studs.
  9. Install the bracket nuts to the communication interface module.

    10. Tighten
    Tighten the nuts to 4 N·m (35 lb in).


    Object Number: 769971 Size: SH
  10. Install the communication interface module cover.
  11. Close the rear compartment.