Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.