Compass Operation - All

Upon ignition on, if the calibration information stored in the CMTC memory is within the normal range, the CMTC will perform in slow Auto-Cal mode. In slow Auto-Cal mode, the CMTC continuously compensates for the slowly changing magnetic field of the vehicle. The compass module detects changes in the vehicle magnetism and makes appropriate internal corrections to ensure proper displayed direction. However, if the calibration information stored in the CMTC memory is not within the normal range at ignition on, the CMTC will enter fast Auto-Cal mode. Auto activation of the fast Auto-Cal mode occurs when the CMTC is subjected to high magnetic field strength levels, which cause all compass readings to be erroneous for a continuous period of five (5) minutes. During fast Auto-Cal, "COMPASS CALIBRATING" will display. Fast Auto-Cal can also be performed manually, by completing one 360° turn in an area free from large metal or metallic objects. When complete, the "COMPASS CALIBRATING" EVIC message will turn off and the compass will function normally.