Viano climate control panel issue

My 2001 Mercedes Viano gasoline engine has a dead climate control panel. The diagnostic tool shows an error, heat output is weak, and the AC won't turn on. With 193322 km on the clock, could this be a fuse or a faulty climate control unit? I've heard the wiring harness and connectors can be problematic. Any ideas before I tear into the dash? Could it be a power supply issue?

4 comment(s)

I had a similar issue with my Vito. Check the wiring harness and electrical connectors that feed the climate control unit. The climate control unit could be faulty, but check the wiring first.

Thanks for the quick reply! When you say check the wiring harness, are there specific points I should be looking at first? Any common failure spots or connectors that are known to cause trouble? I'm trying to avoid a complete dashboard disassembly if possible.

Yes, on mine, it was a corroded connector behind the glove box, where the wiring harness connects to the climate control unit. I'd still suggest getting it checked by a workshop if you can't find anything yourself. It's the only way to be sure.

Thanks! I checked the wiring harness and electrical connectors behind the glove box, but I couldn't find any obvious corrosion, so I took it to a workshop. There was a bad electrical connector on the wiring harness. Repair cost was 95€. Problem solved!

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