Power Supply and Ground Circuit Check [Audio AMP]

Power Supply and Ground Circuit Check [Audio AMP]

Regarding Wiring Diagram information, refer to [Premium Audio System: Wiring Diagram [Crew Cab] Premium Audio System [Crew Cab] ].

1. CHECK FUSE

Check that the audio amplifier fuses are not blown.






Are the fuses OK?
YES
GO TO 2
NO
Be sure to eliminate cause of malfunction before installing new fuse.

2. CHECK POWER SUPPLY CIRCUIT

1 Turn ignition switch OFF.





2 Disconnect audio amplifier connector.
3 Check voltage between audio amplifier harness connector B158 and ground.






Is battery voltage present?
YES
GO TO 3
NO
Repair or replace harness or connector.

3. CHECK GROUND CIRCUIT

1 Turn ignition switch OFF.





2 Disconnect audio amplifier connector.
3 Check continuity between audio amplifier harness connector B158 and ground.






Does continuity exist?
YES
Inspection End.
NO
Repair or replace harness or connector.