Thanks DS, got it!
I will try to get some more readings and work thru the flowchart today...

Member Alder said this over on the thread I started about the Klima Monitor..

"pin # 87 indicates there is no power going to the compressor.It should have battery voltage
KL pin is compressor enable ; does it have a change in voltage from max cool to max heat setting ? i assume it should to enable the relay to activate
compressor"

I will check that too and post results.

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2009 Mercedes ML320 Bluetec