Important: Never swap OnStar® vehicle integration units (VIU), or the 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 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®
systems, and are stored in the General Motors vehicle history files by VIN.
Removal Procedure
- Remove the rear compartment trim. Refer to
Rear Compartment Trim Panel Replacement
.
- Remove the electrical component mounting bracket nuts (2).
- Pull the electrical component mounting bracket (1) away from the body and place the electrical component mounting bracket (1) module side up in the rear compartment.
- Disconnect the electrical connection and the coaxial antenna cable from the VCU (2).
- Slide the VCU out of the mounting bracket (1).
- The old VCU must be returned for core credit.
Installation Procedure
- Record the 11-digit ESN from the label on the new VCU module.
- Slide the VCU (2) into the mounting bracket (1).
Notice: In order to avoid damage to the circuit board, do NOT over-tighten the
thumb screws. Using your fingers, apply only a light pressure.
- Connect the electrical connector.
Apply 0.2 N·m (2 lb in) of torque, or less, to the VIU thumb screw electrical connections.
- Connect coaxial antenna cable to the VCU (2).
- Push in on the top of the module assembly until an audible click is heard. This click indicates that the mounting tab (1) has fastened the
VIU/VCU securely to the electrical component mounting bracket.
- Install the electrical component mounting bracket (1) to the vehicle body.
Notice: Refer to Fastener Notice in the Preface section.
- Install the electrical component mounting bracket nuts (2).
Tighten
Tighten the nuts to 9 N·m (80 lb in).
- Install the rear compartment trim. Refer to
Rear Compartment Trim Panel Replacement
.
- Reconfigure the OnStar® system. Refer to
OnStar Reconfiguration
.
The 11-digit ESN number will be needed by the OnStar® advisor.