2008 Pontiac Grand Prix Owner's Manual - Page 182

Compass Calibration The compass can be manually calibrated. Only calibrate the compass in a magnetically clean and safe location, such as an open parking lot, where driving the vehicle in circles is not a danger. It is suggested to calibrate away from tall buildings, utility wires, manhole covers, or other industrial structures, if possible. If the DIC display does not show a heading, for example, N for North, or the heading does not change after making turns, there may be a strong magnetic field interfering with the compass. Such interference may be caused by a magnetic CB or cell phone antenna mount, a magnetic emergency light, magnetic note pad holder, or any other magnetic item. Turn off the vehicle, move the magnetic item, then turn on the vehicle and calibrate the compass. To adjust for compass variance and to calibrate the compass, use the following procedure: 2. Find the vehicle's current location and variance zone number on the map. Zones 1 through 15 are available. 3. Press the set/reset button to scroll through and select the appropriate variance zone. 4. Press the options button to advance to the calibration screen. Do not operate any switches such as window, sunroof, climate controls, seats, etc. during the calibration procedure. Compass Variance (Zone) and Calibration Procedure 1. Do not set the compass zone when the vehicle is moving. Only set it when the vehicle is in PARK (P). Press the options button until COMPASS CALIBRATION MODE displays. 3-66