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AV-192 < DTC/CIRCUIT DIAGNOSIS > [DISPLAY AUDIO WITH BOSE] MICROPHONE SIGNAL CIRCUIT MICROPHONE SIGNAL CIRCUIT Diagnosis Procedure INFOID:0000000009758906 Regarding Wiring Diagram information, refer to . 1. CHECK HARNESS BETWEEN BLUETOOTH ® CONTROL UNIT AND MICROPHONE 1. Turn ignition switch OFF. ® control unit connector M45 and microphone connector R4. 3. Check continuity between Bluetooth ® control unit connector M45 and microphone connector R4. 4. Check continuity between Bluetooth ® control unit connector M45 and ground. Are continuity results as specified? YES >> GO TO 2 NO >> Repair harness or connectors. 2. CHECK MICROPHONE POWER SUPPLY 1. Connect Bluetooth ® control unit connector M45 and microphone connector R4. 2. Turn ignition switch ON. 3. Check voltage between microphone connector R4 and ground. Is the voltage reading as specified? YES >> GO TO 3 NO >> Replace Bluetooth ® control unit. Refer to AV-217, "Removal and Installation" 3. CHECK MICROPHONE SIGNAL Check signal between terminals of Bluetooth ® control unit connector M45. Bluetooth ® control unit Microphone Continuity Connector Terminal Connector Terminal M45 7 R4 1 Yes 8 2 29 4 Bluetooth ® control unit Ground Continuity Connector Terminal M45 7 — No 29 Microphone Ground Voltage (Approx.) (+) (-) Connector Terminal R4 29 — 5V |