Electronic Compass Module Programming and Setup
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 GMC Sierra 3500 HD, 2013 GMC Sierra 2500 HD, 2013 GMC Sierra 1500, 2013 Chevrolet Silverado 3500 HD, and 2013 Chevrolet Silverado 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The electronic compass module requires a calibration after the module is replaced, repaired, or as required for proper module operation. Refer to Compass Calibration and Magnetic Variance (without OnStar Only) .