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AV-56 < DTC/CIRCUIT DIAGNOSIS > [DISPLAY AUDIO] MICROPHONE SIGNAL CIRCUIT MICROPHONE SIGNAL CIRCUIT Diagnosis Procedure INFOID:0000000011276754 Regarding Wiring Diagram information, refer to 1. CHECK HARNESS BETWEEN AUDIO UNIT AND MICROPHONE 1. Turn ignition switch OFF. 2. Disconnect audio unit connector M87 and microphone connector R8. 3. Check continuity between audio unit connector M87 and microphone connector R8. 4. Check continuity between audio unit connector M87 and ground. Is the inspection result normal? YES >> GO TO 2. NO >> Repair harness or connectors. 2. CHECK MICROPHONE POWER SUPPLY 1. Connect audio unit connector M87 and microphone connector R8. 2. Turn ignition switch ON. 3. Check voltage between microphone connector R8 and ground. Is the inspection result normal? YES >> GO TO 3. NO >> Replace audio unit. Refer to AV-67, "Removal and Installation" . 3. CHECK MICROPHONE SIGNAL Check signal between terminals of audio unit connector M87. Audio unit Microphone Continuity Connector Terminal Connector Terminal M87 45 R8 1 Yes 46 4 47 2 Audio unit Ground Continuity Connector Terminal M87 45 — No 46 Microphone Ground Voltage (Approx.) (+) (-) Connector Terminal R8 4 — 5V |