GM Service Manual Online
For 1990-2009 cars only

Compass Calibration

Before calibrating the compass, drive the vehicle to an area that is magnetically clean (free of large metallic objects).

  1. Turn ON the ignition.
  2. Press the MODE button in order to advance to the COMPASS CALIBRATION mode.
  3. Press the SELECT button in order to display PRESS RESET TO RECALIBRATE.
  4. Press the RESET button.
  5. Drive the vehicle in circles at a speed of less than 10 MPH (16 km/h) until the DIC displays CALIBRATION COMPLETE and the compass displays the proper vehicle heading. The calibration procedure is now complete.

Compass Magnetic Variation Adjustment

Magnetic variation adjustments are required when the compass displays a constant error in heading. Variation is the difference between magnetic north and true north due to geographical location.


    Object Number: 9020  Size: SH
  1. Locate your geographic location. Refer to the variation zone map.
  2. Turn ON the ignition, with the engine OFF.
  3. Press the MODE button in order to advance to the COMPASS CALIBRATION mode.
  4. Press the SELECT button in order to display RESET CHANGES ZONE.
  5. Press the RESET button in order to advance to the proper zone number.
  6. Press the MODE button in order to enter and set the zone number.