Can anyone post the schematic or the way the board works. AL that technical electronic stuff. I work at a Clothing Manufacurer and we send out motherboards and chips to some of the more sophisticated machines here to get repaired, going to send him teh push buttom control board to see what up and if it needs to be repaired, see if he can do it.

Iggy

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Insanity: doing the same thing over and over again and expecting different results.

2006 - Suzuki Gran Vitara (2.0 L fully equipped) Like this car so far except for trying to put on the seatbelt.
1988 - 190e - 2.3L - 172K miles (It now belongs to the exwife)
1999 - Chevy Blazer LS Fully Equiped - killed it June 2006
2001 - Honda Civic EX - 68K miles (sold June 2004)
1963 - 220S - Dual Carb 6 cyl. (sold)
1994 - Yamaha WaveRaider (fun to ride)

Try George Murphy in Oak Ridge, Tennessee. I bought a rebuilt one from him, and it works great. He knows Mercedes' climate control systems, too.
Hope this helps.