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
1.CHECK AMP ON SIGNAL (BOSE SPEAKER AMP)
Turn audio system ON.
Check voltage between BOSE speaker amp. harness connector B121 terminal 60 and ground. 60 - Ground : More than approx. 6.5 V
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 M43 terminal 1 and ground.
1 - Ground : More than approx. 6.5 V
Is voltage greater than 6.5V?
YES >> Repair harness or connector.
NO >> Replace audio unit. Refer to See: Radio/Stereo\Service and Repair\Audio Unit\Bose Audio Without Navigation .