Thank for your advises. Sorry, its B335 not B355. The ALDL ist covered, but I will use some contact spray. Maybe it helps...
@ Dave: I don't think so, it's only the climate which is not responding, all others like radio, gauges, options, summary are working well.
The CRTC is the small attached module on the right side of the CRT, right? You don't think, it could be related to the climate control modul itself?