Compass: Description and Operation
System DescriptionOverview
The electrical compass shows the azimuth information in the 8-directions (N, NE, E, SE, S, SW, W, NW) to the audio-HVAC display unit via the audio unit.
An ignition switch is made into position of ON (II), in oder for the electrical compass unit to communicate with the audio unit and to do a self-test.
The self-test function checks for the voltage, non-volatile memory (NVM), and ROM status in the electrical compass unit. If the self-test detects a failure.
The electrical compass unit has a self-calibration function. It detects and compensates for magnetic anomalies caused by bridges, subways and large steel structures. When the vehicle leaves an area with strong magnetic interference field (2400 mG or more), the electrical compass unit automatically begins calibrating. If needed, you can calibrate the compass.
Zone selection is required to compensate for the difference between magnetic North and geographic North. This deviation is referred to as declination, the compass compensates for declination when you select the zone where the vehicle is located.
Electrical Compass Unit Connector Inputs And Outputs
Electrical Compass Unit Connector Inputs And Outputs:
