Electronic Compass Programming - Inside Rear View Mirror
WARNING: This page is about a different car, the 2008 Cadillac DTS. 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 on how to calibrate the compass from the inside rear view mirror.