So I've been working on replacing the amp and speakers in my '13 JK. It has the Alpine factory system with the amplifier under the dash.
I read that to add another amplifier to this, a special adapter that reads the CAN bus signals from the head unit is required so that fade/balance and volume work correctly.
However, I also read that if you remove the factory amp, the standard adapter that just takes the speaker outputs and converts them to line level will work. I ended up buying both types of adapters because I wasn't sure what to expect.
I started by disconnecting my factory amplifier and using the standard head unit line level converter. Initially this worked like a charm. I had fade, balance, treble, bass, and mid control from the head unit through my new amps.
However, after starting the vehicle for the first time, the factory Radio reverted to thinking the factory amp was there and I had constant volume, with no fade, balance, or tone controls.
I think this happened because I had left the battery disconnected while I did the install, and then after the first start of the vehicle, the Jeep's engine computer communicated with the factory radio over the CAN bus and told it "hey, you have a factory Alpine system".
Anyway, I ended up putting in the "special" CAN bus adapter and now I have fade, balance, and variable volume, but no tone controls.
Also, the fade and balance are a little wonky. I have to put it 1 step to the left side to get it to correctly balance the speakers at low volumes. I'd rather just use the standard adapter, and get tone controls back.
Has anyone had any success in using a standard adapter with the Alpine or Infinity systems after removing the factory amplifier?
Do I have to get the dealer to program the computer or radio to tell it "hey, you don't have the factory amplifier so revert to normal speaker control"?