Grand Cherokee 2WD Limited V8-4.7L (2002)
Power Door Lock Actuator: Description and Operation
Power operated front door, rear door, and liftgate locking mechanisms are standard equipment on this model. The lock mechanisms are actuated by a
reversible electric motor mounted within each door and the liftgate. The power lock motors for the doors are integral to the door latch units. The liftgate
power lock motor is a separate unit secured to the latch bramplate near the center of the liftgate and operates the liftgate latch lock mechanism through a
connecting linkage rod.
The power lock motors for the four doors cannot be adjusted or repaired and, if faulty or damaged, the entire door latch unit must be replaced. The
liftgate power lock motor cannot be adjusted or repaired and, if faulty or damaged, the entire liftgate latch actuator (bramplate) unit must be replaced.
The driver side front door power lock motor is controlled by the Driver Door Module (DDM). The remaining power door lock motors and the liftgate
power lock motor are controlled by the Passenger Door Module (PDM). A positive and negative battery connection to the two motor terminals will
cause the power lock motor plunger to move in one direction. Reversing the current through these same two connections will cause the power lock motor
plunger to move in the opposite direction.
