Jake,
My diagram also shows a circuit breaker. It seems to me that the circuit breaker is part of the motor to protect it from overloading.
You should be able to troubleshoot the problem with a volt/ohm meter. Your steering column switch may be more complex than the US model becasue it has to do the positve/negative switching. In th US, the column switch grounds one signal or another from a memory seat control unit and the control unit will take care of the up/down movement accordingly.
Good luck
David
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