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AV U1243 DISPLAY UNIT AV-447 < COMPONENT DIAGNOSIS > [BOSE AUDIO WITH NAVIGATION] C D E F G H I J K L M B A O P 3. CHECK COMMUNICATION SIGNAL 1. Connect display unit connector and AV control unit connector. 2. Turn ignition switch ON. 3. Check signal between display unit harness connector terminal and ground using an oscilloscope. Is inspection result normal? YES >> GO TO 4. NO >> Replace AV control unit. 4. CHECK COMMUNICATION SIGNAL Check signal between display unit harness connector terminal and ground using an oscilloscope. Is inspection result normal? YES >> INSPECTION END NO >> Replace display unit. (+) ( − ) Condition Reference value Display unit Connector Terminal M49 11 Ground When adjusting display bright- PKIB5039J (+) ( − ) Condition Reference value Display unit Connector Terminal M49 22 Ground When adjusting display bright- PKIB5039J |