That module inside the padded box is a mighty important part, young man. That is the PSE pump, stands for Pneumatic System Equipment (in German, I'm sure). It controls the unlocking/locking of the car, the anti-theft alarm, many exterior and all interior lighting features, it even has a built in crash sensor (not for airbag systems, though) to shut-off the fuel pump, unlock doors, and turn on hazard flashers in a crash. So if you come out from a store and your flashers are on, the doors are unlocked and the car won't start, better take a walk around the car to look for serious damage! (Actually, I think the car needs to be running to begin with). The harnesses are the ones I am talking about for the CD changer. Let me know if you need to know what the 3 wires are, the brown one is definitely the ground from the radio. I don't recall those wires being put into the spongey box for the PSE pump, though. But as you can imagine, it's been a couple years already since I put a CD changer in a 99 202 chassis. Time really flugens, eh?
Gilly