Background: 93 FD R1 (non-Bose). Never had the audio working since I acquired the car. OEM system was dead when I bought it.

I’ve purchased a new head unit and have everything working except for the door and center channel speakers. I’ve tried two different harnesses. The first one I purchased (CarXtc) off of Amazon yielded the same result as the Metra one (in the picture below) I purchased from Best Buy. This Metra one has the blue wire with the white stripe that the other one doesn’t have. The orange wire is also in a different place. I guess Scosche is next on the list.

I haven’t pulled the door cards yet to check the speakers yet, but before I do, I thought I’d ask if anyone knows whether the center channel amp is required for the door speakers to work when using these wiring harnesses. I’m not sure if the amp is blown and don’t really care about the center speaker, but noticed in the wiring diagram, that the door signal routes through that amp. I’d be surprised if all three front speakers are blown but maybe.

I’m also not adverse to putting in new door speakers and running new speaker wires, but before I do, I’d just like to know what the issue actually is.

Anyone know what 1J and 2I are that run between us the head unit and center channel amp?

I’ve attached the wiring diagram and a couple photos of my harness wiring.

It looks like 1J is what the blue wire with the white stripe is connected to via the harness. I would assume that is power to the center channel amp but don’t know. I have it connected to the blue and white remote wire from the head unit.

Does this jumper in the radio relay socket look correct? Per the wiring diagram and the socket, I’m thinking not...

Ok. So I see how the jumper jumps 1J from the main radio harness into the center speaker amp. I’m leaning toward this thing is just blown and needs to be bypassed.

Ok. Per another thread with the same issue, I pulled the front speaker harness and while that fixed the issue for him, it didn’t solve mine. It did however allow me to hear a very faint crackling in the center speaker. Still nothing in the doors.

I think its safe to say the center channel amp is blown.

I’m going to move on past this and rewire the doors, replace the stock speakers with something modern to match the rest of the system, and bypass that 25 year old amp.