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AV MICROPHONE SIGNAL CIRCUIT AV-175 < DTC/CIRCUIT DIAGNOSIS > [MID AUDIO WITHOUT BOSE] C D E F G H I J K L M B A O P MICROPHONE SIGNAL CIRCUIT Diagnosis Procedure INFOID:0000000009174491 Regarding Wiring Diagram information, refer to 1. CHECK MICROPHONE SIGNAL CIRCUIT CONTINUITY 1. Turn ignition switch OFF. ® control unit connector B3 and microphone connector. 3. Check continuity between Bluetooth ® control unit connector B3 terminals 7, 8, 29 and microphone con- nector R109 terminals 6, 5, 3. 4. Check continuity between Bluetooth ® control unit connector B3 terminals 7, 8, 29 and ground. Is inspection result normal? YES >> GO TO 2. NO >> Repair or replace harness or connectors. 2. CHECK MICROPHONE VCC VOLTAGE 1. Connect Bluetooth ® control unit connector B3. 2. Turn ignition switch ON. ® control unit connector B3. Is the inspection result normal? YES >> GO TO 3. NO >> Replace Bluetooth ® control unit. Refer to AV-197, "Removal and Installation" 3. CHECK MICROPHONE SIGNAL 1. Connect microphone connector. ® control unit connector B3. Bluetooth ® control unit Microphone Continuity Connector Terminal Connector Terminal B3 7 R109 6 Yes 8 5 29 3 Bluetooth ® control unit Ground Continuity Connector Terminal B3 7 — No 8 29 Bluetooth ® control unit connector B3 Voltage (Approx.) (+) ( −) Terminal Terminal 29 8 5.0 V |