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AV-392 < COMPONENT DIAGNOSIS > [BOSE AUDIO WITH NAVIGATION] MICROPHONE SIGNAL CIRCUIT MICROPHONE SIGNAL CIRCUIT Description INFOID:0000000000964869 Supply power from AV control unit to microphone. The microphone transmits the sound voice to the AV control Diagnosis Procedure INFOID:0000000000964870 1. CHECK CONTINUITY BETWEEN AV CONTROL UNIT AND MICROPHONE CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect AV control unit connector and microphone connector. 3. Check continuity between AV control unit harness connector terminals 26, 27, 28 and microphone har- 4. Check continuity between AV control unit harness connector terminals 26, 28 and ground. Is inspection result OK? YES >> GO TO 2. NO >> Repair harness or connector. 2. CHECK VOLTAGE MICROPHONE VCC 1. Connect AV control unit connector. 2. Turn ignition switch ON. 3. Check voltage between AV control unit harness connector terminals 26 and 27. Is inspection result OK? YES >> GO TO 3. NO >> Replace AV control unit. 3. CHECK MICROPHONE SIGNAL 1. Connect microphone connector. 2. Check signal between AV control unit harness connector terminals 28 and 27. Is inspection result OK? YES >> Replace AV control unit. NO >> Replace microphone. 26 - 4 : Continuity should exist. 27 - 2 : Continuity should exist. 28 - 1 : Continuity should exist. 26, 28 - Ground : Continuity should not exist. 26 - 27 : Approx. 5 V 28 - 27 PKIB5037J |