AMP On Signal Circuit Check

AMP On Signal Circuit Check

Description

When the audio system is turned on, a voltage signal is supplied from the audio unit to the audio amplifier. When this signal is received, the audio amplifier will turn on.

Diagnosis Procedure

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

1. CHECK AMPLIFIER ON SIGNAL

1 Turn audio system ON.
2 Check voltage between audio amplifier harness connector B159 terminal 9 and ground.











Is battery voltage present?
YES
Inspection End.
NO
GO TO 2

2. CHECK AMPLIFIER ON SIGNAL (audio unit)

Check voltage between audio unit harness connector M66 terminal 12 and ground.











Is battery voltage present?
YES
Repair or replace harness or connector.
NO
Replace audio unit. Refer to [Audio Unit: Removal and Installation] Audio Unit.