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AV-180 < DTC/CIRCUIT DIAGNOSIS > [NAVIGATION WITHOUT BOSE] MICROPHONE SIGNAL CIRCUIT MICROPHONE SIGNAL CIRCUIT Diagnosis Procedure INFOID:0000000011276876 Regarding Wiring Diagram information, refer to . 1. CHECK HARNESS BETWEEN AV CONTROL UNIT AND MICROPHONE 1. Turn ignition switch OFF. 2. Disconnect AV control unit connector M102 and microphone connector R8. 3. Check continuity between AV control unit connector M102 and microphone connector R8. 4. Check continuity between AV control unit connector M102 and ground. Is the inspection result normal? YES >> GO TO 2. NO >> Repair harness or connectors. 2. CHECK MICROPHONE POWER SUPPLY 1. Connect AV control unit connector M102 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 AV control unit. Refer to AV-200, "Removal and Installation" . 3. CHECK MICROPHONE SIGNAL Check signal between terminals of AV control unit connector M102. AV control unit Microphone Continuity Connector Terminal Connector Terminal M102 34 R8 1 Yes 35 4 36 2 AV control unit Ground Continuity Connector Terminal M102 34 — No 35 Microphone Ground Voltage (Approx.) (+) (-) Connector Terminal R8 4 — 5V |