Abstract: A door lock actuator including a single non-reversible drive motor for generating step-wise rotation of an output shaft through an indexing assembly which is decoupled from the motor during periods of operation. The indexing assembly includes an index pin plate coupled to a drive gear for rotation therewith. The plate includes a plurality of spaced pins which are positioned to contact a rotating paddle driven by the drive motor. The paddle successively contacts the pins in a portion of its rotation to cause corresponding rotation of the drive gear and the output gear which is meshingly engaged therewith. The output gear is coupled to an output shaft having twin cams positioned thereon for manipulating door latch pawls to control the door lock state. An override mechanism is provided which includes top and bottom override arms driven by rotation of a key in the key cylinder.