2006 Cadillac DTS Owner's Manual - Page 114

Compass Variance The mirror is set to zone eight upon leaving the factory. It will be necessary to adjust the compass to compensate for compass variance if the vehicle is driven outside zone eight. Under certain circumstances, such as a long distance, cross-country trip, it will be necessary to adjust the compass variance. Compass variance is the difference between earth's magnetic north and true geographic north. If the mirror is not adjusted to account for zone changes, the compass could give false readings. To adjust for zone changes, do the following: 1. Find your current location and variance zone number on the zone map that follows. 2. Press and hold the "auto highbeam" button approximately six seconds until a zone number appears in the display. 3. Once the zone number appears in the display, press the "auto highbeam" button quickly until you reach the correct zone number. Stop pressing the button and the mirror will return to normal operation. If C appears in the compass window, the compass needs calibration. See "Compass Calibration" listed previously. 2-36