Amp On Signal Circuit

AMP ON SIGNAL CIRCUIT

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, 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.
9 - Ground: More than 6.5V
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.
12 - Ground: More than 6.5V
Is battery voltage present?
YES- Repair or replace harness or connector.
NO- Replace audio unit. Premium Audio (Crew Cab).