Hello all!!
I have a 1990 300SE in the shop because the A/C compressor will not engage. I noticed that this car does not have the traditional klima relay. I think all of the processes go thru the MAS relay in this model. I am trying to find out if I am getting a signal from the A/C push button to activate the compressor but don't know what pin in the MAS relay (if thats how you check) I am suppose to check for activation. Any help would be appreciated!!

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