Audio System Symptom Troubleshooting - Volume does not change (6 CD Changer Type)

Audio System Symptom Troubleshooting - Volume does not change

Volume does not change

NOTE: Set the fader and balance position to the center.

1.	Operate the volume switch to see if the volume changes accordingly. Does it change? YES - Operation is normal.n NO - Go to 2.

2.	Operate the volume switch to see if the LCD display changes accordingly. Does it change? YES - Faulty audio unit.n NO - Go to 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.

PRINTED CIRCUIT BOARD CONNECTOR (10P)AUDIO GNDVOL-BVOL-A

VOL SWITCH	Normal position	1 Click Clockwise	1 Click Clockwise	1 Click Clockwise
Normal	Continuity present.R = about 1 kW	Continuity absent.R = infinity	Continuity presentR = about 1 kW	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.n

NO - Faulty front printed circuit board.n