Electronic Compass Programming - Inside Rear View Mirror
WARNING: This page is about a different car, the 2008 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
The compass requires a calibration after the inside rear view mirror is replaced, repaired or as required for proper compass operation. Refer to Compass Calibration and Magnetic Variance (Driver Information Center (DIC)) or Compass Calibration and Magnetic Variance (Mirror) on how to calibrate the compass from the inside rear view mirror.