is your problem with the pin "Receivers" inside the female plug that the Klima
plugs into? (with your DMM the signals are not "Steady".)

Have you gone down that diagnostic alley yet?

I believe the metal female receivers (to which the wires attach on the backside
of the plug) are replaceable[You would, of course, have brand new WIRE to
RECEIVER connections when you're through!]

OR are we talking loose pins on the Klima?

No loose pins on the Klima and the receivers in the plug are good electrically...
(AND the wiring to the plug tests O.K.)

Time to test the Klima itself...somewhere in the archives is a test sequence.

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'84 300SD sold
124.128