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AV-264 < DTC/CIRCUIT DIAGNOSIS > [COLOR DISPLAY - W/O BOSE] MICROPHONE SIGNAL CIRCUIT MICROPHONE SIGNAL CIRCUIT Description INFOID:0000000010064913 Voice signals are transmitted from the microphone to the Bluetooth ® control unit using the microphone signal circuits. Diagnosis Procedure INFOID:0000000010064914 Regarding Wiring Diagram information, refer to AV-282, "Wiring Diagram - Without BOSE Audio System With- 1. CHECK HARNESS BETWEEN BLUETOOTH ® CONTROL UNIT AND MICROPHONE 1. Turn ignition switch OFF. ® control unit connector and microphone connector. 3. Check continuity between Bluetooth ® control unit harness con- nector B131 (A) and microphone harness connector R7 (B). 4. Check continuity between Bluetooth ® control unit harness connector B131 (A) and ground. Are the continuity test results as specified? YES >> GO TO 2. NO >> Repair harness or connector. 2. CHECK MICROPHONE POWER SUPPLY 1. Connect Bluetooth ® control unit connector and microphone con- nector. 2. Turn ignition switch ON. 3. Check voltage between microphone harness connector R7 ter- minal 4 and ground. Is voltage reading approx. 5 volts? YES >> GO TO 3. NO >> Replace Bluetooth ® control unit. Refer to AV-333, "Removal and Installation" 3. CHECK MICROPHONE SIGNAL A B Continuity Connector Terminal Connector Terminal B131 7 R7 1 Yes 8 2 29 4 A — Continuity Connector Terminal B131 7 Ground No 8 29 WKIA5795E (+) (-) Voltage (Approx.) Connector Terminal R7 4 Ground 5V WKIA5796E |