Just got a '95 E320, looking for a little help

[ljsense]

I've been searching the archives, have fund useful info for replacing rear hatch struts, and I intend to post pictures of my project, as well as a few other things.

What I'm more uncertain of are these issues:

1. The sunroof is shut, and the switch doesn't open it.
2. Of all the speakers, only the one in the rear passenger's side seat works
3. Windshield washer doesn't spray.
4. The seat adjustment control doesn't raise or lower the headrests.

My thought is that these are all unrelated, and common problems. I should treat them individually -- first, check to clear the sprayer nozzles, then look at the lines, and finally look at the water pump or grommet.

And the radio unit probably has its own unique problems.

And if the sunroof is similar to my old 123 coupe, the cable is probably gummed up in the housing, and the felt pads are poorly lubricated. Etc.

But I wondered if anyone had insights about some common cause.

I think the main engine wiring harness has been replaced.

Is there another electrical gremlin that could knock out several things at once?