GM Service Manual Online
For 1990-2009 cars only

If the vehicle has this feature, it can be helpful when parallel parking. The passenger's outside rearview mirror will tilt towards the curb when the vehicle is shifted into REVERSE (R) and return to its previous position when the vehicle is shifted out of REVERSE (R). If further adjustment is needed, the power mirror controls can be used. See Outside Power Mirror . Also see DIC Vehicle Personalization for information on how to turn this feature on and off.