2008 Dodge Grand Caravan Owner Manual - Page 242

240 UNDERSTANDING YOUR INSTRUMENT PANEL Compass/Temperature Display Compass Variance Compass Variance is the difference between magnetic North and Geographic North. In some areas of the country, the difference between magnetic and geographic North is great enough to cause the compass to give false readings. In order to ensure compass accuracy, the compass variance should be properly set according to the compass variance map zone that the vehicle is in. NOTE: Magnetic materials should be kept away from the top of the instrument panel. This is where the compass sensor is located. To Set the Variance NOTE: Refer to the "Compass Variance Map" in the following "Electronic Vehicle Information Center (EVIC)" section for your Zone Value. Start the engine, and leave the transmission gear selector lever in the PARK position. Press and hold (approximately ten seconds) the CMTC reset button until the current variance zone number is displayed. To change the zone, press and release the CMTC reset button to increment the variance one step. Repeat as necessary, until the desired variance is achieved. NOTE: The factory default Zone is 8. During programming, the zone value will wrap around from Zone 15 to Zone 1. Manual Compass Calibration If the compass appears erratic, inaccurate or abnormal, you may wish to calibrate the compass. Prior to calibrating the compass make sure the proper zone is selected. 1. Start the engine, and leave the transmission in the PARK position.