Compass Calibration & Compass Magnetic Variation Adjustment: Notes
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Before calibrating compass, drive vehicle to an area that is magnetically clean and free of large metallic objects such as high tension wires or steel buildings. Ensure there are no magnetized items on inside or outside of vehicle near mirror.