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AV U1243 DISPLAY UNIT AV-99 < DTC/CIRCUIT DIAGNOSIS > [BOSE AUDIO WITHOUT NAVIGATION] C D E F G H I J K L M B A O P Is the inspection result normal? YES >> GO TO 3. NO >> Repair harness or connector. 3. CHECK COMMUNICATION SIGNAL 1. Connect front display unit connector and AV control unit connector. 2. Turn ignition switch ON. 3. Check signal between front display unit harness connector and ground using an oscilloscope. Is the inspection result normal? YES >> GO TO 4. NO >> Replace AV control unit. 4. CHECK COMMUNICATION SIGNAL Check signal between front display unit harness connector and ground using an oscilloscope. Is the inspection result normal? YES >> INSPECTION END NO >> Replace front display unit. (+) ( − ) Condition Signal Front display unit Connector Terminal M49 11 Ground When adjusting display bright PKIB5039J (+) ( − ) Condition Signal Front display unit Connector Terminal M49 22 Ground When adjusting display bright PKIB5039J |