2005 GMC Envoy Owner's Manual - Page 114

Manual Rearview Mirror with OnStar® and Compass The vehicle may have a manual rearview mirror with OnStar® and an eight-point compass display located in the upper right. Control buttons for the OnStar® system are at the bottom of the mirror. See your GM dealer for more information on the OnStar® system. Also, see OnStar® System on page 2-47 for more information about the services OnStar® provides. Compass Display O(On/Off): Press this button to turn the compass on or off. The compass display, can show a maximum of two characters. For example, NE is displayed for north-east. When the ignition and the compass/temperature feature are on, character boxes will appear for about two seconds. After two seconds, the mirror will display the direction the vehicle is facing. Compass Calibration When on, the compass automatically calibrates as the vehicle is driven. If, after two seconds, the display does not show a compass direction, (N for North, for example), there may be a strong magnetic field interfering with the compass. Such interference may be caused by a magnetic antenna mount, magnetic note pad holder, or a similar magnetic item. If the letter C should ever appear in the compass window, the compass may need calibration. Press and hold the on/off button for nine seconds to activate the compass calibration mode. CAL will be displayed in the compass window on the mirror. The mirror can be calibrated by driving the vehicle in circles at 5 mph (8 km/h) or less until the display shows a direction. Mirror Operation While sitting in a comfortable position, adjust the rearview mirror so you can see clearly behind your vehicle. Grip it in the center and move it up or down and side to side. The day/night control, located at the bottom of the mirror, adjusts the mirror to reduce headlamp glare from behind during evening or dark conditions. Push the control for daytime use; pull it for night use. 2-40