Sure, those tests already done. I get 0.4V when the pump should run and 0V when not. Actually everything works fine except pump which does not get current. Pump is ok, tested it with outer 12V source. When engine hot and cabine and outside cold and ignition off when I press 'Auto' the climate panel comes on, fan start to rotate and pre-set tempratures can be seen. the fan is on perhaps 3 minutes and then slowly goes off. I guess that this happens due to the reason that pump is not running and heater matrix becomes cold. That is what I believe. Does the system know what is the air temperature blowed to cabin?
On the other hand: when engine cold, cabin cold and garage cold (all in same temp) and ignition off nothing happens when I press 'Auto'.
One thing came to my mind. I tested the pin 19 only with ohm meter and the resistance was "about" zero. With these cheap digital meters results close to zero are difficult. Perhaps I shoulf feed 12V to that pin and check whether the pump starts to rotate then. If there is a bad contact somewhere the resistance can be close to zero when not real current going through but when there is real load the voltage drops. Like when you have bad earth somewhere e.g in tail light. When only tail light on it illuminates but when you press brake pedal both goes 'off'.