OnStar (R) Vehicle Communication Unit (VCU) Replacement

REMOVAL PROCEDURE




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 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. Install the cellular coaxial cable to the (VCU) pressing into place until fully seated.




2. Install the the DB-25 connector to the (VCU) pressing into place until fully seated.




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




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




6. Install the cover to the OnStar(R) vehicle communication unit (VCU) pressing into place until fully seated.
7. Reprogram the (VCU) module when the (VCU) module has been replaced or the power to the (VCU) module has been disconnected. Refer to Vehicle Interface Unit (VIU)/Vehicle Communication Unit (VCU) Reprogramming.
8. Close the rear compartment.