Volume does not change NOTE: Set the fader and balance position to the center. Operate the volume switch to see if the volume changes accordingly. Does it change?
YES | - | Operation is normal.■
NO | - | Go to Step 2 .
Operate the volume switch to see if the LCD display changes accordingly. Does it change?
YES | - | Faulty audio unit.■
NO | - | Go to Step 3 .
Remove the audio-HVAC display module from the dashboard, and remove the audio unit , and check for continuity between the No. 5 and No. 1 terminals and No. 10 and No. 1 terminals of the printed circuit board 10P connector.
VOL SWITCH | Normal position | 1 Click Clockwise | 1 Click Clockwise | 1 Click Clockwise
--- | --- | --- | --- | ---
Normal | Continuity present. R = about 1 kΩ | Continuity absent. R = infinity | Continuity present. R = about 1 kΩ | Continuity absent. R = infinity
Abnormal | Continuity present | Continuity present | Continuity present | Continuity present
Abnormal | Continuity absent | Continuity absent | Continuity absent | Continuity absent
Check to see if the continuity between the No. 5 and No. 1 terminals will turn on and off as described above when turning the volume clockwise by one click at a time; does the presence and absence of continuity alter?
YES | - | Faulty audio unit.■
NO | - | Faulty front printed circuit board.■