Honda Pilot: Electrical Compass System Description - Overview

Overview

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

Starting Operation

When the vehicle is turned to the ON mode, the electrical compass unit communicates with the audio unit, and 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 indicates a malfunction by flashing the compass information segments (CAL and NW) in the audio unit.

Basic Operation

The electrical compass unit uses the noise filter to the raw magnetic data. The noise filter switches on/off depending on the intensity of environment magnetic noise. In the filter mode, the calculation may delay several seconds. After processing the compass data, the unit sends the azimuth (direction) information to the audio unit.

• The electrical compass unit also receives the following signals via the audio unit:
• The electrical compass unit receives the vehicle speed information from the gauge control module via the audio unit. The azimuth information is fixed while the vehicle is parked.
• The electrical compass unit receives the RR DEF on/off information from the climate control unit. The electrical compass unit compensates for magnetic anomalies when the rear window defogger is on.

Self-Calibration

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 the area with a strong magnetic interference (2,400 mG or more), the electrical compass unit automatically begins calibrating. If needed, you can manually calibrate the compass.

Zone Selection

The zone selection is required to compensate for the difference between the magnetic north and the geographic north. This deviation is referred to as a declination. The compass compensates for the declination when you select the zone where the vehicle is located.

EGR System Description - OverviewElectronic Throttle Control System Description