2005 Pontiac Montana SV6 Owner's Manual - Page 217

Setting the Variance Automatic Compass Calibration The compass is self-calibrating, which eliminates the need to manually set the compass. When the vehicle is new, the calibration process may not be complete. In these cases the calibration symbol C will be displayed where the compass reading is normally displayed. To calibrate the compass, in an area free from large metal objects, make three 360° turns. The calibration symbol will turn off and the compass reading will be displayed. Manual Compass Calibration If the compass appears erratic and the calibration symbol does not appear, you must manually put the compass into the calibration mode. Turn the ignition on and cycle the DIC to the compass/temperature mode. Press both the E/M and MODE buttons simultaneously for at least 10 seconds until the calibration symbol appears. Release both buttons and complete three 360° turns in an area free from large metal objects. The calibration symbol will turn off and the compass reading will be displayed. Turn the ignition on and cycle the DIC to the compass/temperature mode. Press both the E/M and MODE buttons simultaneously for about five seconds. The last entered variance zone number will be displayed. Press the E/M button until the proper variance number, as shown on the map for your location is shown. Press the MODE button to set the new variance zone and resume normal operation. The display will show all the display segments briefly to acknowledge the change in the zone number. 3-53