A mechanically-activated decoupler is used in the actuator of the cinching
latch mechanism. The decoupler activates with an input from door handle
operation such that the motor drive within the actuator decouples from
the remainder of the actuator gear train and latch mechanism whenever the
door handle is operated. At rest the actuator is direct-coupled to the
latch mechanism having a lost motion provision to allow manual latch
function. Because of this the actuator with its motor drive is unloaded
and routine door handle-activated decoupling carries little friction. In
the event of a power failure during a cinching or release cycle, the
handle input activates the clutch and decouples the otherwise binding
motor drive of the actuator allowing the remainder of the latch mechanism
to return to its at rest state using light return springs. After
returning to its at rest state the latch mechanism retains normal manual
function until the power failure is corrected.