Quote:
Originally Posted by ah-kay
CCU/Computer controls voltage to switch something on/off. So you can measure resistance or current as long as you know what you are doing. I have fixed all the Kilma on all my 300SDLs so it not as difficult as it seems.
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The above is factually incorrect for a W126.
The CCU provides the GROUND to close the clutch relay in the Klima.
If you fixed your own Klima's on the W126, it had nothing to do with the ground signal from the CCU and you are requested to refrain from posting any more erroneous information as others depend on it.