2006 Pontiac Grand Prix Owner's Manual - Page 183

To set or reset the tire inflation monitor system, use the following procedures: 1. Press the set/reset button to reset the tire inflation monitor system. TIRE INFLATION HAS BEEN SET will appear on the screen If the "Check Tire Pressure" message, indicating an irregularity in the pressure of one of the tires, had previously appeared on the DIC. If the "Check Tire Pressure" message did not appear, and the set/reset button is pressed, the system will reset, but no acknowledgment message will appear on the screen. 2. Press the options button again to advance to the next screen. Select the set/reset button to return to the main (date) screen. COMPASS CALIBRATION MODE: This menu allows you to adjust for compass variance. Setting the Compass The compass is self-calibrating, which eliminates the need to manually set the compass. However, under certain circumstances, such as during a long distance cross-country trip, it will be necessary to compensate for compass variance and reset the zone through the DIC. Compass variance is the difference between the earth's magnetic north and true geographic north. If not adjusted to account for compass variance, the compass in the vehicle could give false readings. In order to do this, the compass must be set or calibrated to the variance zone in which the vehicle is travelling. 3-65