Security indicator does not work properly

1. Check if the problem appears when turning the ignition switch OFF.

Does the problem appear?

YES | - | Go to Step 2 .
NO | - | Operation is normal.■

1. Remove the audio-HVAC display module.

1. Connect the No. 6 (VDD) and No. 1 terminal of the front printed circuit board. Then apply the positive voltage to the No. 7 terminal intermittently on and off to observe whether the LED will turn on and off correspondingly to the inputs of the voltage as shown in the figure.

Does LED respond to the voltage inputs?

YES | - | Faulty audio unit.■
NO | - | Faulty front printed circuit board.■