Onstar Vehicle Communication Unit (Vcu) 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 IP cluster harness in order to gain access to the VCU bracket screw.
3. Remove the screw securing the VCU to the bracket.
4. Disconnect the electrical connectors.
5. Remove the VCU from the bracket.
6. The old VCU must be returned for core credit.

Installation Procedure




1. Record the 11-digit ESN from the label on the new VCU module.

NOTE: In order to avoid damage to the circuit board, do NOT over-tighten the thumb screws. Using your fingers, apply only a light pressure.

2. Install the VCU to the bracket.
3. Connect the electrical connectors to the VCU.

NOTE: Refer to Fastener Notice in Service Precautions.

4. Install the screw.

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

5. Install the IP cluster harness.
6. Install the IP trim panel.
7. Press and hold the "end call" button, which is a black button with a white dot.
The OnStar(R) status light will change from green to red to green.
8. Contact the OnStar(R) Dealer support line by pressing the blue OnStar(R) button twice.
The 11-digit ESN number will be needed by the OnStar(R) advisor.