Starting Operation

When the ignition switch is turned to ACCESSORY (I), the electrical compass unit begins to communicate with the audio unit. Then 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 while in the self-test, it indicates a malfunction by flashing compass information segments (CAL and NW) in the audio-HVAC display unit.

The electrical compass unit send the azimuth (direction) information to the audio unit. The electrical compass unit receive the VSP signal from the gauge control module via the audio unit. The azimuth information is fixed while parked. The electrical compass unit also receives following signals via the audio unit:

• RR DEF (on/off) signal from the climate control unit. The electrical compass unit compensates for magnetic anomalies when the rear window defogger is on.
• INTR LT signal from the driver's MICU. The electrical compass unit not compensates for magnetic anomalies when the rear window defogger is on and the rear door or the trunk lid is opening.