Looks like a bunch of us bought this at the same time. What a nightmare.
Crutchfield, although trying like troopers, cannot get it to work, and is suggesting return and reinstall factory HU. This is after four hours on the phone with their tech support and a large dismantling of goodly portions of my car. I was told it was plug-n-play when I bought it.
Problem is no sound from subwoofers. Issue is that the factory HU was a two channel, while amp is a 4 (or six) channel. Appears that DaimlerChrysler jury-rigged the set-up by splitting the two channel just before the amp and running one side to a separate amp channel to power the rear speakers. Some have apparently fixed this on this forum, but they are speaking Greek to me. Solution appears to be to run rear speaker wires from the D558BT HU to the amp inputs on the channel addressing the rear speakers and disconnect factory splice from this channel on the amp.
Having written what I just wrote, I have no idea what that really means. I don't know where to hook the speaker wires to the amp. I don't know which wires on the harness (Metra) from Crutchfield represent the rear speakers from the HU, and apparently there are not enough volts thrown from the RCA connectors to power up the switch on the amp. Again, I don't really know what I am saying.
Can anyone tell me how to make this head unit work with an 'place tab A into slot A' description. I can run wire. I can attach wire. I can splice wire. I cannot, however, even tell you what a pre-amp is let alone which channel is run by what part of any amp.
Am I also right in assuming that those who described a plug and play situation were dealing with base models or simply never noticed that their rear speakers quit working?
Thanks for any help.