Diagnosis Procedure

Regarding Wiring Diagram information, refer to [PREMIUM AUDIO SYSTEM: WIRING DIAGRAM [CREW CAB] ].

Step	Action	YES	NO
1	CHECK HARNESS BETWEEN BLUETOOTH CONTROL UNIT AND MICROPHONE  Turn ignition switch OFF. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Disconnect Bluetooth control unit connector B141 and microphone connector R8. 3. Check continuity between Bluetooth control unit harness connector B141 (A) and microphone harness connector R8 (B). Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. 4. Check continuity between Bluetooth control unit harness connector B141 (A) and ground. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Are the continuity test results as specified?	GO TO 2	Repair harness or connector.
2	CHECK MICROPHONE POWER SUPPLY  Connect Bluetooth control unit connector B141 and microphone connector R8. Courtesy of SUZUKI OF AMERICA CORP. 2. Turn ignition switch ON. 3. Check voltage between microphone harness connector R8 terminal 4 and ground. 4 - Ground: Approx. 5V  Is voltage reading approx. 5 volts?	GO TO 3	Replace Bluetooth control unit. Refer to [Bluetooth Control Unit: Removal and Installation ].
3	CHECK MICROPHONE SIGNAL  Check signal between Bluetooth control unit harness connector B141 terminals 7 and 8 with SDT or and oscilloscope. Are voltage readings as specified?	Replace Bluetooth control unit. Refer to [Bluetooth Control Unit: Removal and Installation ].	Replace microphone. Refer to [Microphone: Removal and Installation ].