OnStar Services

See also:

Rear Compartment Fuse Block (CTS-V Coupe and Sedan)
The rear compartment fuse block is located on top of the battery, on the right side of the trunk. The battery access door must be removed to access the fuse block. The vehicle may not be equi ...

Folding the Seatback
To fold the seatback: 1. Open the liftgate to access the controls for the seat. 2. Remove all items on the seat cushion. Notice: Folding a rear seat with the safety belts still fastened may cause d ...

Recommended Fuel
If the vehicle has a V6 engine, use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, an audible knocking noise, commonly referred ...