Composite Image Signal Circuit (AV Control Unit To Front Display Unit)

COMPOSITE IMAGE SIGNAL CIRCUIT (AV CONTROL UNIT TO FRONT DISPLAY UNIT)


Description


WITHOUT DVD ENTERTAINMENT SYSTEM
AV control unit that inputs the camera image signal and AUX image signal transmits the composite image signal to the front display unit.

WITH DVD ENTERTAINMENT SYSTEM
AV control unit receives the image signal from the video distributor and camera control unit and then transmits the composite image signal (AUX, DVD and camera image) to the front display unit.





COMPOSITE IMAGE SIGNAL CIRCUIT (AV CONTROL UNIT TO FRONT DISPLAY UNIT)


Diagnosis Procedure

1.CHECK CONTINUITY COMPOSITE IMAGE SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AV control unit connector and front display unit connector.
3. Check continuity between AV control unit harness connector and front display unit harness connector.





4. Check continuity between front display unit harness connector and ground.





Is the inspection result normal?
YES - GO TO 2.
NO - Repair harness or connector.
2.CHECK COMPOSITE IMAGE SIGNAL
1. Connect AV control unit connector and front display unit connector.
2. Turn ignition switch ON.
3. Check signal between front display harness connector using an oscilloscope.




Is the inspection result normal?
YES - Replace front display unit.
NO - Replace AV control unit.