2009 GMC Savana Van Owner's Manual - Page 116

Outside Towing Mirrors Vehicles with towing mirrors can be adjusted manually for a clear view of the objects behind you. Outside Power Mirrors Vehicles with outside power mirrors have controls located on the driver side door. On the lower portion of each mirror there is an auxiliary convex mirror that can be adjusted manually to provide an extended field of view. The mirrors can be manually folded in or out. Select each mirror by turning the knob clockwise for the passenger side mirror or counterclockwise for the driver side mirror. The center position is neutral. Then, adjust the mirror angle by moving the knob in the desired direction. The auxiliary convex mirrors can only be adjusted manually. 2-32