GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Tahoe - 2WD 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 OnStar Vehicle Interface Unit Replacement

Removal Procedure

    Important: The vehicle interface unit (VIU) 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. Remove the instrument panel (I/P) trim panel. Refer to Instrument Panel Upper Trim Pad Replacement .

    2. Object Number: 661489 Size: SH
  2. Remove the 2 screws (1) securing the VIU to the bracket.
  3. Disconnect the electrical connectors.
  4. Remove the VIU from the bracket.
  5. The old VIU must be returned for core credit.

Installation Procedure
  1. Record the 10-digit STID number from the label on the new module.

    2. Object Number: 661489 Size: SH
  2. Install the VIU to the bracket.
  3. Connect the electrical connectors.

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

  4. Install the 2 screws (1) securing the VIU to the bracket.

    5. Tighten
    Tighten the screws to 9 N·m (80 lb in).

  5. Install the I/P trim panel. Refer to Instrument Panel Upper Trim Pad Replacement .

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

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