Onstar Vehicle Interface Unit (Viu) Replacement

IMPORTANT: Never swap OnStar(R) vehicle integration units (VIU), or the vehicle communication units (VCU) from other vehicles. Transfer of OnStar(R) components from other vehicles should NOT be done. Each OnStar(R) component has a unique identification number. The VIU has a 10-digit specific station identification (STID) and the VCU has a 11-digit specific electronic serial number (ESN). These identification numbers are used by the National Cellular Telephone Network and OnStar(R) systems, and are stored in the General Motors vehicle history files by VIN.

Removal Procedure




1. Remove the IP trim panel.
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 VIU module.
2. Install the VIU to the bracket.
3. Connect the electrical connectors.

NOTE: Refer to Fastener Notice in Service Precautions.

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

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

5. Install the IP trim panel.
6. Contact the OnStar(R) Dealer Support line by pressing the OnStar(R) button twice.
The 10-digit STID number recorded will be needed by the OnStar(R) Dealer Support line.