When the ignition switch is in ACC (I) or the vehicle is in the ACC mode, the electrical compass unit begins to communicate with the audio unit. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, 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 multi-information display.

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 a strong magnetic interference field (2,400 mG or more), the electrical compass unit automatically begins calibrating after it receives the VSP signal from the gauge control module via the audio unit. If needed, you can manually 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. If you replaced the electrical compass unit, set the compass zone.