Diagnosis Function

DIAGNOSIS FUNCTION
The following are checked:
- All the indicators (LED) in the A/C and AV switch.
- Continuity of the switches by sounding the buzzer when the A/C and AV switch and audio steering wheel switch is pressed.
- Continuity of harness between A/C and AV switch and audio steering switch.

NOTE: Rear window defogger switch operation is not checked. (No beep sound even under normal status)