See also:

Rear Seats
The vehicle's rear seats have head restraints in the outboard seating positions, but they are not adjustable. Rear outboard head restraints are not designed to be removed. ...

Tire Rotation
Tires should be rotated every 12 000 km (7,500 mi). See Maintenance Schedule. Tires are rotated to achieve a uniform wear for all tires. The first rotation is the most important. Any time ...

Add-on Electrical Equipment
The OnStar system is integrated into the electrical architecture of the vehicle. Do not add any electrical equipment. See Add-On Electrical Equipment. Added electrical equipment may interfer ...