Nissan Maxima Service and Repair Manual: AMP on signal circuit
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.
1.CHECK AMP ON SIGNAL (BOSE SPEAKER AMP)
- Turn audio system ON.
- Check voltage between BOSE speaker amp. harness connector B109 terminal 20 and ground.
2.CHECK AMP ON SIGNAL (AUDIO UNIT)
Check voltage between audio unit harness connector M132 terminal 1 and ground.