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AV-136 < COMPONENT DIAGNOSIS > [PREMIUM AUDIO (CREW CAB)] MICROPHONE SIGNAL CIRCUIT MICROPHONE SIGNAL CIRCUIT Description INFOID:0000000005274965 Voice signals are transmitted from the microphone to the Bluetooth control unit using the microphone signal Diagnosis Procedure INFOID:0000000005274966 Regarding Wiring Diagram information, refer to . 1. CHECK HARNESS BETWEEN BLUETOOTH CONTROL UNIT AND MICROPHONE 1. Turn ignition switch OFF. 2. Disconnect Bluetooth control unit connector and microphone 3. Check continuity between Bluetooth control unit harness con- 4. Check continuity between Bluetooth control unit harness connector B141 (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- 2. Turn ignition switch ON. 3. Check voltage between microphone harness connector R8 ter- Is voltage reading approx. 5 volts? YES >> GO TO 3 NO >> Replace Bluetooth control unit. Refer to . 3. CHECK MICROPHONE SIGNAL A B Continuity Connector Terminal Connector Terminal B141 7 R8 1 Yes 8 2 29 4 A — Continuity Connector Terminal B141 7 Ground No 8 29 WKIA5795E 4 - Ground : Approx. 5V WKIA5796E |