Auto Dimming Mirror: Adjustments: Compass: Calibration
If after 2 seconds, compass does not show a direction, check for possible magnetic interference (magnetic antenna mount, etc.). If the letter "C" appears in compass window, mirror needs calibration. Mirror can be calibrated in one of 2 ways, either by driving in circles at 5 MPH (8 km/h) or less until display reads a direction, or driving an every day routine.