Starting Operation

When the ignition switch is turned to ACC (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 display-USB adapter control unit or the audio-HVAC display unit.

The electrical compass unit sends the azimuth (direction) information to the audio unit across a UART communication bus. The electrical compass unit receives the VSP signal from the gauge control module via the audio unit. The azimuth information is fixed while parked.