The actuator (10) has a control unit (16) for reading received signals and for effecting movement of a mechanical element (12) in response to a read-out signal. The control unit evaluates the received signals at predetermined pulse width modulation (PWM) frequency in one mode, to determine end positions (S-1,S-2) of the mechanical element, and effects movement of the mechanical element to an intermediate position between the end positions in other mode. An independent claim is included for method for constructing motor car.
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