FixVault
Home › Pontiac › 2002 › Aztek AWD › Repair and Diagnosis › External Pages › Different car › Section 892 (Stationary Window System) › Description and Operation › Compass Calibration and Variance Procedure › Compass Magnetic Variation Adjustment

Compass Magnetic Variation Adjustment

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

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.

    Fig 1: World Magnetic Variation Map
    GM384280Courtesy of GENERAL MOTORS CORP.
  1. Locate your current geographic location on the World Magnetic Variation Map.
  2. Turn ON the ignition, with the engine OFF.
  3. Press and hold the switch for the compass, which may be depicted as COMP, COMPASS, or on/off (w/UE1) depending on the type of mirror on the vehicle, until a zone number appears on the compass display.
  4. Depress the switch for the compass to select the desired zone number.
  5. Wait 5 seconds. The display will return to a compass heading. The variance procedure is now complete.
  6. Calibrate the compass. Refer to Compass Calibration mentioned above.
About FixVault