Without Scan Tool
How to enter the self-diagnosis mode1. Turn the ignition switch to the ACC (I) or ON (II).
2. Enter the anti-theft code.
3. Push and hold the "No. 1" and "No. 6" buttons and "PWR" knob.
4. The word "DIAG" will display on the subdisplay.
How to exit the self-diagnosis mode
Turn the audio power off or the ignition switch OFF.