[JivenJim]

OK... Hold out your hands... SMACK!!

Now I can't solve your problem but this could give you some leads. (no pun intended)

Red 1.5mm Thick 12V supply
Red/Yellow 1.5mm 12V to Horn
Black .5mm goes to Window Control Relay pin 1 I think that needs to go to Switched 12V (Red/black) for windows to work? Alarm Feature??
Blue/White .5mm G53 (starter)
Blue .5mm F55
Green .5mm F58 (Alarmanlage?){alarm}
Brown/White .5mm Instrument panel light (armed)
Brown/Black .5mm Engine Cover Alarm Switch Loop
Brown/Red .75mm Alarm Key Switch loop return
Brown .75mm Alarm Key Switch Send loop
Brown .5mm Alarm Ground
For Sunroof switch:
I would try tying all the Brown Wires to together and make sure they go to Ground.
Not sure how that would effect Dash lights. (don't see how that would hurt anything)

Dash lights:
There was a Center console 4 wire edge connector tinny PCB that was attached to the Parking Brake Warning light and Seatbelt light. I think it had some good size yellow and blue wires. Maybe that had the dazzy chained Grey/blue +12V dash lights wire coming of it.

Oh I think I found it. Yea there's a small Brown coming from the Gauge lights that goes to a "Control Unit Radio and Lifting Roof" Not sure what's that is but if you tie thoes Brown Wires together and make sure the get back to Chassis Ground I think that will at least fix the lights.

I just updated the wire colors.