An adjustable vehicle mirror assembly uses a revolution sensor for detecting revolutions of an element in a mirror rotation drive chain. A control circuit uses the revolution sensor control rotation of the mirror to a preset orientation by counting revolutions and controlling a motor power supply and its direction dependent on whether the count indicates that the count of revolutions has reached a preset value. At power down, power up or when a new preset value is defined the control circuit switches to an overrule state in order to calibrate an offset. The control circuit continues operating in the overrule state until a rotation coupling in the mirror assembly reaches a disengaged state or stalls.