OnStar (R) Vehicle Interface Unit (VIU) Replacement

REMOVAL PROCEDURE




1. Remove the vehicle communication unit (VCU) from the vehicle interface unit (VIU). Refer to OnStar (R) Vehicle Communication Unit (VCU) Replacement.
2. Remove the nuts from the (VIU/VCU) bracket.
3. Remove the (VIU) from the inner wheelhousing.




4. Disconnect the Global Positioning System (GPS) antenna cable from the (VIU).




5. Disconnect the (RED) 32-way connector from the (VIU)




6. Disconnect the (Blue) 32-way connector from the (VIU).




7. Remove the mounting screws from the (VIU).
8. Remove the (VIU) from the (VIU/VCU) bracket.

INSTALLATION PROCEDURE




1. Position the VIU to the (VIU/VCU) bracket.

NOTE: Refer to Fastener Notice in Service Precautions.

2. Install the screws to the (VIU).

Tighten
Tighten the screws to the (VIU) to 3 N.m (27 lb in).




3. Connect the global positioning system (GPS) antenna cable to the (VIU).




4. Connect the (RED) 32-way connector to the (VIU).




5. Connect the (Blue) 32-way connector to the (VIU).




6. Position the (VIU) from the inner wheelhousing.
7. Install the nuts to the (VIU/VCU) bracket.

Tighten
Tighten the nuts to the (VIU/VCU) bracket to 3 N.m (27 lb in).

8. Install the vehicle communication unit (VCU). Refer to OnStar (R) Vehicle Communication Unit (VCU) Replacement.
9. Reprogram the (VIU) when the (VIU) has been replaced or the power to the (VIU) has been disconnected. Refer to Vehicle Interface Unit (VIU)/Vehicle Communication Unit (VCU) Reprogramming.