GM Service Manual Online
For 1990-2009 cars only

Compass Calibration

    Important: Before calibrating the compass, drive the vehicle to a area that is magnetically clean, and free of large metallic objects.

  1. Turn ON the ignition.
  2. Press the MODE button in order to advance to the COMP/TEMP mode.
  3. Simultaneously depress and hold the US/MET and MODE buttons until a C is displayed, in approximately 10 seconds.
  4. Release both buttons.
  5. Drive the vehicle in circles at a speed of less than 8 km/h (5 mph) until the C is replaced by a proper vehicle heading. The calibration procedure is now complete.

Compass Magnetic Variation Adjustment


    Object Number: 9020  Size: SH

    Important: 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.

  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 COMP/TEMP mode.
  4. With the DIC in the COMP/TEMP mode, simultaneously depress and hold the MODE and US/MET buttons until VAR CAL is displayed, in approximately 5 seconds.
  5. Release both buttons.
  6. Press the US/MET button in order to advance to the proper zone number.
  7. Press the MODE button in order to enter and set the zone number.