Compass: Description and Operation

Electrical Compass System Description

Overview

The electrical compass shows the azimuth information in 8-directions (N, NE, E, SE, S, SW, W, NW) to the audio-HVAC display unit via the audio unit.

When the ignition switch is turned to ACCESSORY (I), the electrical compass unit begins to communicate with the audio unit. When you turn the ignition switch to ON (II), the self-test mode begins automatically.

The self-test function checks for the current voltage, non-volatile memory (NVM), and ROM status in the electrical compass unit. If the unit detects a malfunction during the self-test, it flashes segments of the compass information (CAL and NW) in the audio-HVAC display unit to indicate a problem.

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 (2400 mG or more), the electrical compass unit automatically begins calibrating. If needed, you can manually calibrate the compass. Programming and Relearning

Zone selection is required to compensate for the difference between magnetic North and geographic North. This deviation is referred to as declination, and the compass compensates for declination when you select the zone where the vehicle is located. Programming and Relearning






System Diagram





Electrical Compass Unit Connector Inputs and Outputs






Electrical Compass Unit 6P Connector