Grand Cherokee 2WD V8-4.7L VIN J (2004)
Power Door Lock Switch: Description and Operation
POWER LOCK SWITCH
The power lock motors are controlled by a two-way momentary switch mounted on the trim panel of each front door. Each power lock switch is
illuminated by a Light-Emitting Diode (LED) that is integral to the switch paddle.
The driver side front door power lock switch is integral to the Driver Door Module (DDM), and the passenger side front door power lock switch is
integral to the Passenger Door Module (PDM). The power lock switches and their lamps cannot be adjusted or repaired and, if faulty or damaged, the
entire DDM or PDM unit must be replaced.
The front door power lock switches provide a lock and unlock signal to the door module circuitry. The Driver Door Module (DDM) circuitry controls
the output to the driver side front door power lock motor, while the Passenger Door Module (PDM) circuitry controls the output to the passenger side
front door, both rear door and the liftgate power lock motors.
When the DDM-integrated power lock switch is actuated, the DDM circuitry sends control outputs to the driver side front door power lock motor and
sends a message to the PDM over the Programmable Communications Interface (PCI) data bus to control the output to the passenger side front door,
both rear door and the liftgate power lock motors. When the PDM-integrated power lock switch is actuated, the PDM circuitry sends control outputs
to the passenger side front door, both rear door and the liftgate power lock motors and sends a message to the DDM over the Programmable
Communications Interface (PCI) data bus to control the output to the driver side front door power lock motor.
Each power lock switch is illuminated by a Light Emitting Diode (LED) when the ignition switch is turned to the On position. See the owner's manual
in the vehicle glove box for more information on the features, use and operation of the power lock switches.