GM Service Manual Online
For 1990-2009 cars only

If the vehicle has manual outside mirrors, adjust them by hand so that the side of the vehicle can be seen while you are sitting in a comfortable driving position.

The mirrors can be folded inward to prevent damage when going through an automatic car wash. To fold, push the mirror toward the vehicle. To return the mirror to its original position, push outward. Return both mirrors to the unfolded position before driving.