GM Service Manual Online
For 1990-2009 cars only

If the vehicle has memory seat and mirrors, it will also be capable of adjusting the passenger's mirror to tilt to a preselected position when the vehicle is shifted into REVERSE (R). Use this feature to view the curb when parallel parking.

When the vehicle is shifted out of REVERSE (R) and after a five-second delay, the passenger's mirror will return to its original position.

If further adjustment is needed after the mirror is tilted, the mirror controls can be used. See Outside Power Heated Mirrors for more information.