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AV-178 < DTC/CIRCUIT DIAGNOSIS > MICROPHONE SIGNAL CIRCUIT MICROPHONE SIGNAL CIRCUIT Description INFOID:0000000006216346 Supply power from AV control unit to microphone. The microphone transmits the sound/voice to the AV control Diagnosis Procedure INFOID:0000000006216347 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 and microphone harness connector. 4. Check continuity between AV control unit harness connector and ground. Is the inspection result normal? 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. Is the inspection result normal? YES >> GO TO 3. NO >> Replace AV control unit. Refer to AV-212, "Removal and Installation" . 3. CHECK MICROPHONE SIGNAL 1. Connect microphone connector. 2. Check signal between AV control unit harness connector. AV control unit Microphone Continuity Connector Terminals Connector Terminals M210 71 R17 2 Existed 72 4 87 1 AV control unit Ground Continuity Connector Terminals M210 72 Not existed 87 (+) ( − ) Voltage (Approx.) AV control unit Ground Connector Terminal M210 72 5.0 V |