1996 Buick Park Avenue Owner's Manual - Page 109

use a cotton swab ana glass cleaner to clean the photocells when necessary. Compass Calibration Once the compass is calibrated, it does not need to be recalibrated as long as the mirror is left in your vehicle and the vehicle remains in the same geographical zone. To calibrate the compass: 1. Set the switch on the mirror control to C/M. 2. Turn the vehicle ignition switch on. The letter C should be displayed in the mirror compass window. If not, hold the CAL switch (on the bottom of the mirror) for more than 10 seconds, and the letter C should appear. To hold in the CAL switch, insert a paper clip into the small hole on the bottom of the mirror housing. The display will show a number first, but keepholding until the letter C appears. 3. For quick calibration, drive the vehicle in a 360-degree circle at less than 5 mph (8 km/h) until the display reads a compass direction. For normal calibration, drive the vehicle on your everyday routine, and the compass will eventually calibrate. Variance is the difference between magnetic north and geographic north. In some areas, the difference between the two can be great enough to cause false compass readings. If this happens, follow these instructions to set the variance for your particular location: 1. Find your location on the zone map. Note your zone number.