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

1. Remove the dash trim bezel. Refer to Instrument Panel Cluster Trim Plate Bezel Replacement .
2. Remove the garnish molding on the windshield pillar. Refer to Windshield Pillar Garnish Molding Replacement .
3. Remove the dash trim pad. Refer to Instrument Panel Upper Trim Pad Replacement .



4. Remove the screws (2) securing the VIU bracket to the instrument panel (I/P) metal brace.



5. Disconnect the red 32-way electrical connectors (1) and the blue 32-way electrical connector (2).



6. Disconnect the microphone (1) and global position system (GPS) cables (2) from the VIU.



7. Remove the VIU (2) from the bracket by rotating the module upwards to release the hook tab (1).
8. The old VIU must be returned for core credit.

1. Record the 10-digit STID number from the label on the VIU module.



2. Install the VIU (2) to the bracket by rotating the unit downwards into the hook tab (1).



3. Reconnect the microphone (1) and GPS cables (2) from the VIU.



4. Reconnect the red 32-way electrical connectors (1) and the blue 32-way electrical connector (2).

Notice: Refer to Fastener Notice in the Preface section.




5. Install the screw (2) securing the VIU bracket to the I/P metal brace.

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

6. Install the dash trim pad. Refer to Instrument Panel Upper Trim Pad Replacement .
7. Install the garnish molding on the windshield pillar. Refer to Windshield Pillar Garnish Molding Replacement .
8. Install the dash trim bezel. Refer to Instrument Panel Cluster Trim Plate Bezel Replacement .
9. Reconfigure the Onstar® system. Refer to OnStar Reconfiguration .

The STID number recorded will be needed by the Onstar® Dealer support line.