Diagnosis Procedure

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

DIAGNOSIS PROCEDURE

Step	Action	YES	NO
1	CHECK HARNESS - REQ1 Turn ignition switch OFF. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. 2. Disconnect satellite radio tuner (factory installed) connector M41 and audio unit connector M48. 3. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 28 and audio unit harness connector M48 (B) terminal 48. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. 4. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 28 and ground. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Are continuity results as specified?	GO TO 2	Repair or replace harness or connector.
2	CHECK HARNESS - TXD Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 29 and audio unit harness connector M48 (B) terminal 49. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. 2. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 29 and ground. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Are continuity results as specified?	GO TO 3	Repair or replace harness or connector.
3	CHECK HARNESS - RXD Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 30 and audio unit harness connector M48 (B) terminal 50. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. 2. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 30 and ground. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Are continuity results as specified?	GO TO 4	Repair or replace harness or connector.
4	CHECK REQ1 SIGNAL Connect satellite radio tuner (factory installed) connector and audio unit connector. Turn ignition switch to ACC Check signal between satellite radio tuner (factory installed) harness connector M41 terminal 28 and ground with SDT or oscilloscope. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Are voltage readings as specified?	GO TO 5	Replace audio unit. Refer to [Audio Unit: Removal and Installation ].
5	CHECK TXD SIGNAL Check signal between satellite radio tuner (factory installed) harness connector M41 terminal 29 and ground with SDT or oscilloscope. Are the voltage readings as specified?	GO TO 6	Replace satellite radio tuner.
6	CHECK RXD SIGNAL Check signal between satellite radio tuner (factory installed) harness connector M41 terminal 30 and ground with SDT or oscilloscope. Are the voltage readings as specified?	Replace satellite radio tuner. Refer to [Satellite Radio Tuner: Removal and Installation ].	Replace audio unit. Refer to [Audio Unit: Removal and Installation ].