switching device (1) to control a system (2) for a seat comfort function, comprising at least one actuator (103) with at least one actuator (104) and at least one SMA element (100), the actuator (104) being adjustable between a first and a second position,where the circuit device (1) includes at least one resistance measurement device (5) to measure the resistance of at least one SMA element (100),where the control device (1) continues to have at least one driver unit (6) to operate the actuator (103) with at least one SMA element (100) and one control unit (30) to control the driver unit (6) suitable for processing an output signal of the resistance measurement device (5),where the switching device is designed to interact alternately with the SMA element with the resistance measurement device (5) and the driver unit (6).
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