Grand Cherokee 4WD V8-4.7L VIN N (2000)
Keyless Entry Receiver: Description and Operation
The Remote Keyless Entry (RKE) receiver is a radio frequency unit contained in the Passenger Door Module (PDM). The PDM also contains the
program logic circuitry for the RKE system. The PDM is secured with screws to the back of the trim panel inside the passenger side front door. The RKE
receiver has a memory function to retain the vehicle access codes of up to four RKE transmitters. The receiver is designed to retain the transmitter codes
in memory, even if the battery is disconnected.
For diagnosis of the RKE receiver, the PDM, the DDM, or the Programmable Communications Interface (PCI) data bus a DRB scan tool and the proper
Diagnostic Procedures are recommended. The RKE receiver is only serviced as a unit with the PDM and, if faulty or damaged, the entire PDM unit must
be replaced.
The RKE receiver is energized by one of three messages from the RKE transmitter; Unlock, Lock, or Panic. The PDM circuitry responds to these
messages to lock or unlock the power lock motors that it controls. The PDM circuitry also puts Lock, Unlock, and Panic messages on the PCI data bus.
These messages will result in the Driver Door Module (DDM) locking or unlocking the driver side front door, and the other electronic modules in the
vehicle responding as their programming dictates.
