So I got my Concert Cassette unit out to install a new Pioneer unit, and found some… oddities, in the wiring… when I removed the adapter to use the Blaupunkt CD changer in the back with the factory HU, I was left with this:
Judging by the antenna mount left on the windscreen, I'm guessing there was a handsfree installed at some point, but I don't know what the spliced-in wires and fuse are for specifically. I went poking around and realized there's a factory amp or sub or something in the back, yet another surprise
Here's my adapter:
As it stands now, it looks like if I use things as they are, I will not get anything from my rear speakers, is that correct? What do I need to do to use the rear speakers (and sub?)
Furthermore, what else do I need to add (if anything) to make sure the HU turns on and off with the ignition, and dims the illumination when I turn on the lights? I seem to recall reading a thing about that ages ago, but not sure if it'll be an issue with this adapter harness.
Happy to take more photos as needed.