GM Service Manual Online
For 1990-2009 cars only

The vehicle's outside mirrors can also perform a park tilt function. This causes the passenger and/or driver's mirror to tilt to a preselected position when the vehicle is in R (Reverse). This feature may be useful in viewing the curb when parallel parking.

When the vehicle is shifted out of R (Reverse) and a short delay has occurred, the passenger and/or driver's mirror will return to its original position.

To change the preselected tilt position, adjust the mirrors to the desired position while the vehicle is in R (Reverse). When the vehicle is shifted out of R (Reverse), this new position is saved in memory as the tilt position.

This feature can be enabled/disabled through the Driver Information Center. See DIC Vehicle Customization for more information.