2004 GMC Canyon Owner's Manual - Page 117

Automatic Dimming Rearview Mirror with Compass and Temperature Display Your vehicle may have an automatic dimming rearview mirror with a compass, temperature display, and map lamps. Compass Operation The mirror has an eight-point compass display in the upper right corner of the mirror face. When on, the compass automatically calibrates as the vehicle is driven. When the ignition and the compass feature are on, the compass will show two character boxes for approximately two seconds. After two seconds, the mirror will display the current compass heading. For example, NE is displayed for north-east. Mirror Operation The mirror automatically changes to reduce glare from headlamps behind you. A time delay feature prevents rapid changing from the day to night positions while driving under lights and through traffic. The automatic dimming feature is automatically activated when the vehicle is started. The automatic dimming feature is turned on or off by pressing this button located on the lower part of the mirror. Press and hold the button for up to three seconds to turn this feature on or off. Compass Calibration If after two seconds the display does not show a compass heading, there may be a strong magnetic field interfering with the compass. Such interference may be caused by a magnetic antenna mount, note pad holder or similar object. If the letter C appears in the compass window, the compass needs calibration. The mirror compass can be calibrated by driving the vehicle in circles at 5 mph (8 km/h) or less until the display reads a direction. The compass can be placed in calibration mode by pressing and holding the on/off button until a C appears on the compass display. P (On/Off): T (Indicator Light): Map Lamps This light will turn on when the automatic dimming feature is active. The mirror has map lamps located at the bottom of the mirror. To manually turn the lamps on or off, press the button next to each lamp. 2-37