Onstar Vehicle Communication Unit (Vcu) Replacement

REMOVAL PROCEDURE

IMPORTANT: Never exchange OnStar(R) vehicle integration units (VIU) or 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 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(R) systems, and are stored in the General Motors vehicle history files by VIN.




1. Open the rear compartment.
2. Remove the cover from the OnStar(R) vehicle communication unit (VCU) by depressing the retainer tabs.




3. Remove the cellular coaxial cable from the VCU by pulling off.




4. Remove the screws from the DB-25 connector.




5. Remove the DB-25 connector from the VCU.




6. Release the retainer strap from the VCU using a small flat-bladed tool.
7. Remove the VCU from the rear compartment.

INSTALLATION PROCEDURE




1. Record the 11-Digit ESN number from the label on the new part.
2. Install the cellular coaxial cable to the VCU pressing into place until fully seated.




3. Install the DB-25 connector to the VCU pressing into place until fully seated.

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.




4. Hand tighten the screws to the DB-25 connector.




5. Position the (VCU) to the top of the vehicle interface unit (VIU).
6. Install the retainer strap to the VCU pressing into place until fully seated.




7. Install the cover to the VCU bay pressing the cover into place until fully seated.
8. Press and hold the end call button, which is a black button with a white dot. The OnStar status light will change from green to red to green.
9. Contact the OnStar Dealer support line by pressing the blue OnStar button twice. The ESN number will be needed by the OnStar advisor.
10. Close the rear compartment.
11. The old VCU must be returned for core credit.