In answering a previous post I got carried away in shameless self-promotion and linked my recent "Import Car" Mercedses-Benz A/C Control Diagnostics article. I figured since I was in the mood I should actually place the link under a heading where it might get some use.
The article basically decribes the control protocols of the 124 chassis although some mention of other chassis is included. The article gives the testing techniques to analyze many of the questions that appear on this forum and would do well in the archives.
With that in mind some of you computer guys might improve on my link. The link I give will only get to Babcox Publications and then Import Car. Since it is this months cover article it is easy to find right now. Next month it will be harder to find. I don't know whether I have the right to reproduce the article but a link must be OK?