Diagnosis Procedure

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

Step	Action	YES	NO
1	CHECK AMP ON SIGNAL  Turn audio system ON. Check voltage between audio amp. harness connector B159 terminal 9 and ground. Courtesy of SUZUKI OF AMERICA CORP. 9 - Ground: More than 6.5V  Is battery voltage present?	Inspection End.	GO TO 2
2	CHECK AMP ON SIGNAL (audio unit)  Check voltage between audio unit harness connector M66 terminal 12 and ground. 12 - Ground: More than 6.5V  Is battery voltage present?	Repair harness or connector.	Replace audio unit. Refer to [AUDIO UNIT: REMOVAL AND INSTALLATION ].