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 audio unit receives a speed signal from the PCM (VSS signal) via the CAN and UART circuits to the compass unit.
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.
Self-Calibration
The electrical compass unit has a self-calibration function. It detects and compensates for magnetic anomalies caused by magnetized tires, bridges, subways and large steel structures. When the vehicle leaves an area with a strong magnetic interference field (2, 00 mG or more), the electrical compass unit automatically begins calibrating after it receives the VSS from the PCM. IF NEEDED, YOU CAN MANUALLY CALIBRATE THE COMPASS .
See also:
• CHECK THE VEHICLE BATTERY CONDITION FIRST.