Strange, there was a reply from Mxfrank but it seems to have been immediately deleted by him. I am copying it below from email.

I measured between pins 5 and 6 of the klima and it was shorted together. However, if I push on one of the 2 relay contacts, 5 and 6 opens up. So power for the kickdown solenoid is controlled via a relay in the Klima. Mxfrank, you have a 190D as I recall and not a w123 diesel? Maybe the Klima in your 190D works differently?

"Good imagination, but it's not that complicated. The only thing controlling kickdown is the pedal switch. The Klima supplies plain old 12V to the switch. That's all, no logic, no conditioning. On the gas cars, the function is supplied by the fuel pump relay. I guess they want a power source that's related to the engine actually turning.

I'm not sure if there are any fuses on the kickdown circuit. I can tell you for a fact that the trace on the Klima board will turn to smoke if you short the solenoid. It wouldn't be the only case of Bosch using an expensive part as a fuse."

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked