12v trigger for aftermarket amps.

[Spiffy]

I replaced the factory Unleashed amps with JL Audiio equipment.
My car amp installer used a 12v trigger from the sync4 back to the pac audio, 8 channel Amp and mono sub Amp.
Today when I picked up my truck from dealer I have no audio.
Have 12v to amps
But I don't have 12v trigger voltage. If I jump the trigger amps work.
Something got changed from the sync4 back to the amps behind rear seat.

If the technician pulled codes he would have seen error for front speakers. I replaced the factory speakers so that will be a constant fault. I forgot to notify him.
Could he have turned off the trigger voltage somehow in software? There is no indication that the center stack was messed with. Besides I put on my service ticket not to do any factory updates. Just fix the heat exhaust exchanger.
Again I can jump the 12v trigger back at the amps but there is no 12v signal coming from the sync4 head unit.

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[GDN]

Changing the front speakers or any speakers for that part will not cause any faults to be set.

Looks like you need to find where the 12v trigger is getting its power and trigger from. They likely unhooked it.

 

[Buyer2021]

I've used the PAC TR4 successfully on a number of Ford installations lacking a dedicated 12VDC audio trigger source. Never any pops or noise, it just works. I always install it at the amps I want to activate, 'tap' a speaker I/O and the power to the amp, no additional wiring runs involved.

It'll 'sense' when SYNC / ACM turns on, thus generating a (usually inaudible DC-offset) signal to the speaker outputs, and thence can trigger the remote turn-on on an amp, head unit, etc.

Just for your consideration, Have Fun!

 

[Spiffy]

That's interesting. I have a pac also. It turns on with audio signals. No reason I can't tie into it.

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