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AMP ON SIGNAL CIRCUIT


Description

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





AMP ON SIGNAL CIRCUIT


Diagnosis Procedure

Regarding Wiring Diagram information, refer to Without Navigation (coupe) or Without Navigation (sedan).
1.CHECK AMP ON SIGNAL (BOSE SPEAKER AMP)
1. Turn audio system ON.





2. Check voltage between BOSE speaker amp. harness connector
B121 terminal 60 and ground.

60 - Ground : More than approx. 6.5V

Is voltage greater than 6.5V?
YES - Inspection End.
NO - GO TO 2
2.CHECK AMP ON SIGNAL (AUDIO UNIT)





Check voltage between audio unit harness connector M44 (Sedan) or M132 (Sedan) terminal 1 and ground.

1 - Ground : More than approx. 6.5V

Is voltage greater than 6.5V?
YES - Repair harness or connector.
NO - Replace audio unit. Refer to Bose Audio.