GM Service Manual Online
For 1990-2009 cars only

    Object Number: 264772  Size: SH
  1. Compass variance is the difference between magnetic North and geographic North.
  2. The difference between magnetic and geographic North can be great enough to cause the compass to give false readings.

  3. Object Number: 144004  Size: MF
  4. Compass variance is compensated by calibrating the compass.
  5. In order to calibrate the compass successfully, refer to the map in the figure in order to determine the zone number to be entered into the compass. The mirror is preset to Zone 8.

  6. In order to set the compass variance, perform the following procedure:
  7. • Turn the ignition switch to the RUN position.
    • With the display turned ON, push the COMP button for 3 seconds.
    • The Zone selection will show in the mirror compass window.
    • Toggle until the correct zone is found.
    • Release the switch.
    • The display will show the all segments and return to the normal compass mode within 10 seconds of no switch activity.