Keyless Entry: Description and Operation

INTRODUCTION
Power locks and Remote Keyless Entry (RKE) systems are standard factory-installed equipment on these models. All of the doors and the liftgate can be locked and unlocked electrically by operating the switch on either front door trim panel, or the buttons on the RKE transmitter. On vehicles with the optional liftgate liftglass, the power liftglass release circuit is also enabled or disabled by the power door lock switch or the RKE transmitter.

Following are general descriptions of the major components in the power lock, RKE, and liftglass latch systems.

NOTE: This information covers both Left-Hand Drive (LHD) and Right-Hand Drive (RHD) versions of this model. Whenever required and feasible, the RHD versions of affected vehicle components have been constructed as mirror-image of the LHD versions. While most of the illustrations used represent only the LHD version, the diagnostic and service procedures outlined can generally be applied to either version. Exceptions to this rule have been clearly identified as LHD or RHD, if a special illustration or procedure is required.

POWER LOCK SYSTEM
The power lock system allows all of the doors and the liftgate to be locked or unlocked electrically by operating the switch on either front door trim panel. This system operates with battery power supplied through a circuit breaker in the junction block, independent of the ignition switch.

The power lock system includes the front door power lock switches, door modules mounted in each front door, and the power lock motors mounted in each door and the liftgate.

POWER LIFT GLASS RELEASE SYSTEM
Models equipped with the optional liftgate liftglass feature also have a power operated liftglass release system. This system operates with battery power supplied through a fuse in the junction block, independent of the ignition switch. The power liftglass release system allows the liftglass to be opened by depressing a switch mounted in the top of the liftgate license plate tub.

The liftglass release system includes the liftgate mounted switch, a mechanical latch equipped with an electric release solenoid, and a limit switch integral to the liftgate latch mechanism. The limit switch automatically enables or disables the liftglass release circuitry, depending upon the position of the liftgate latch lock mechanism. The liftgate latch can be unlocked or locked using the key in the liftgate lock cylinder, the power lock system, or the remote keyless entry transmitter.

REMOTE KEYLESS ENTRY SYSTEM (RKE)
The Remote Keyless Entry (RKE) system is a radio frequency system that allows the use of a remote transmitter to control the power lock and illuminated entry systems. If the vehicle is so equipped, the RKE transmitter can also control the memory seat, memory mirror, memory radio, and the vehicle theft alarm systems.

The RKE system consists of the remote key fob transmitter and a receiver with program logic, which is integral to the passenger door module. The RKE system can retain the vehicle access codes of two transmitters. The transmitter codes are retained in memory, even if the battery is disconnected.

If a transmitter is faulty or lost, new transmitter vehicle access codes can be programmed into the system using a DRB scan tool and the proper Computers and Control Systems/Body Control Module/Testing and Inspection Procedures.

On models so equipped, a function of the RKE system made possible by the connection of the passenger door module to the Chrysler Collision Detection (CCD) data bus network is a panic mode. If the Panic button on the transmitter is depressed, the horn will sound and lights will flash on the vehicle for about three minutes, or until any of the three transmitter buttons is depressed. A vehicle speed of about 24 kilometers-per-hour (15 miles-per-hour) will also cancel the panic mode.

MEMORY SYSTEM
An electronic memory system is an available option on this model. The memory system is able to store and recall the driver power seat positions (including power lumbar and recliner positions) and both outside power mirror positions. For vehicles with a radio connected to the Chrysler Collision Detection (CCD) data bus network, the memory system is also able to store and recall ten radio station presets (including last station tuned) for two drivers. The memory system will automatically return to all of these settings when the corresponding button (Driver 1 or 2) of the memory switch on the driver front door trim panel is depressed, or when the doors are unlocked using the corresponding (Driver 1 or 2) Remote Keyless Entry (RKE) transmitter.

The Driver Door Module (DDM) receives hard- wired input from the memory switch on the driver front door trim panel. The DDM also receives messages on the CCD data bus from the RKE receiver in the Passenger Door Module (PDM) for the memory select function. The DDM processes these inputs and sends messages to the radio (if the radio is CCD data bus capable), the PDM, and the Memory Seat Module (MSM) on the CCD data bus for memory recall.

The CCD data bus network allows the sharing of sensor information. This helps to reduce wire harness complexity, reduce internal controller hardware, and reduce component sensor current loads. At the same time, this system provides increased reliability, enhanced diagnostics, and allows the addition of many new feature capabilities.

This information covers only the conventional diagnostic procedures for the power lock and RKE system components. For diagnosis of the memory system, use of a DRB scan tool and the proper Computers and Control Systems/Body Control Module/Testing and Inspection Procedures are recommended.

SYSTEM COMPONENTS
Power Lock Switch
The power locks are controlled by a two-way switch mounted in the trim panel of each front door. Each switch is illuminated by a light-emitting diode when the ignition switch is turned to the On position.

The power lock switches are integral to the Driver Door Module (DDM) or Passenger Door Module (PDM), respectively. The power lock switch provides a lock or unlock signal to the door module circuitry.

The power lock switches and their lamps cannot be repaired. If the switches are damaged or faulty, the entire door module must be replaced.

Door Module Overview
The Drivers Door Module (DDM) powers the drivers door lock motor. The Passengers Door Module (PDM) powers the passenger, both rear door lock and the liftgate lock motors. The DDM and PDM each contain a door lock switch. When one of the switches is activated, a signal is sent on the CCD Bus to the other door module (PDM or DDM depending on which switch activated) to either LOCK or UNLOCK the lock motors. The Remote Keyless Entry transmitter can also LOCK or UNLOCK the door lock and liftgate lock motors. The PDM contains the radio frequency receiver that receives the RKE transmitter signals.

The vehicle is equipped with a Rolling Door Lock feature. When this feature is enabled, the PDM will lock the doors and liftgate after the vehicles reaches approximately 15 MPH.

Door Module Operation
A Driver Door Module (DDM) and a Passenger Door Module (PDM) are used on this model to control and integrate many of the electronic features and functions on the vehicle. The DDM and PDM communicate with each other, and with other vehicle modules on the Chrysler Collision Detection (CCD) data bus network.

The CCD data bus network allows the sharing of sensor information. This helps to reduce wire harness complexity, internal controller hardware, and component sensor current loads. At the same time, this system provides increased reliability, enhanced diagnostics, and allows the addition of many new feature capabilities.

The DDM circuitry controls the output to the driver front door power lock motor. The PDM circuitry controls the output to the power lock motors for the remaining doors and the liftgate. When a door lock switch is actuated, the door module circuitry for that switch sends a message to the other door module on the CCD data bus to activate the output to the remaining power lock motor(s).

Some of the features and functions of the power lock and Remote Keyless Entry (RKE) systems made possible because of the communication of the door modules on the CCD data bus network include:
- A door-lock inhibit feature which prevents the power lock system from being energized with a door switch if the key is in the ignition and/or the headlamps are on with the driver door open. However, the locks can still be operated manually with a key or energized with the RKE transmitter.
- A rolling door locks feature will automatically lock all of the doors and the liftgate, after the vehicle reaches a speed of about 24 kilometers-per-hour (15 miles-per-hour) or greater. This feature will also lock the doors if a door is opened, then closed again at any speed above 24 kilometers-per-hour (15 miles- per-hour,). Rolling door locks is a programmable feature of the power lock system. This feature can be enabled or disabled using the DRB scan tool and the proper Computers and Control Systems/Body Control Module/Testing and Inspection Procedures.
- An RKE system panic mode, on models so equipped. If the Panic button on the RKE transmitter is depressed, the horn will sound and lights will flash on the vehicle for about three minutes, or until any of the three transmitter buttons is depressed. A vehicle speed of about 24 kilometers-per-hour (15 miles-per-hour) will also cancel the panic mode.
- A programmable feature of the RKE system is the enabling or disabling of the horn chirp following the RKE Lock function. This feature can be enabled or disabled using the DRB scan tool and the proper Computers and Control Systems/Body Control Module/Testing and Inspection Procedures.
- Another programmable feature is the enabling or disabling of the RKE system unlocking the driver door only, or all doors upon one depression of the transmitter Unlock button. This feature can be enabled or disabled using the DRB scan tool and the proper Computers and Control Systems/Body Control Module/Testing and Inspection Procedures.

For diagnosis of the DDM, PDM, or the CCD data bus network, refer to the proper Computers and Control Systems/Body Control Module/Testing and Inspection Procedures.

Body Control Module
A Body Control Module (BCM) is used on this model to control and integrate many of the electronic functions and features included on the vehicle. The BCM contains a central processing unit and interfaces with other modules in the vehicle on the Chrysler Collision Detection (CCD) data bus network.

The CCD data bus network allows the sharing of sensor information. This helps to reduce wire harness complexity, reduce internal controller hardware and reduce component sensor current loads. At the same time, this system provides increased reliability, enhanced diagnostics, and allows the addition of many new feature capabilities.

One of the functions and features that the BCM supports and controls on models so equipped, is the Remote Keyless Entry (RKE) Panic Mode. The BCM receives input from the RKE receiver in the Passenger Door Module (PDM) on the CCD data bus. The programming in the BCM allows it to process the information from this input and send control outputs to the headlamp relay, horn relay, and park lamp relay to accomplish the panic mode functions.

The BCM is mounted under the driver side outboard end of the instrument panel, behind the instrument panel support armature and below the outboard switch pod. Refer to Instrument Panel Systems for the removal and installation procedures. For diagnosis of the BCM or the CCD data bus, refer to the proper Computers and Control Systems/Body Control Module/Testing and Inspection Procedures. The BCM can only be serviced by an authorized electronic repair station. Refer to the latest Warranty Policies and Procedures for a current listing of authorized electronic repair stations.

Power Lock Motor
In the power lock and Remote Keyless Entry (RKE) systems, the locks are actuated by a reversible motor mounted within each door and the liftgate. The driver front door lock motor direction is controlled by the battery and ground feeds from the Driver Door Module (DDM). The remaining door lock motors and the liftgate lock motor are controlled by the battery and ground feeds from the Passenger Door Module (PDM).

The power lock motor cannot be repaired and, if faulty or damaged, the entire motor must be replaced.

Circuit Breaker
An automatic resetting circuit breaker in the junction block is used to protect the power lock system circuit. The circuit breaker can protect the system from a short circuit, or from an overload condition caused by an obstructed or stuck lock motor, latch, or lock linkage.

The circuit breaker cannot be repaired and, if faulty, it must be replaced.

Remote Keyless Entry Transmitter
The Remote Keyless Entry (RKE) system transmitter is equipped with up to three buttons, labeled Lock, Unlock, and an optional Panic button. It is also equipped with a key ring and is designed to serve as a key fob. The operating range of the transmitter radio signal is up to 7 meters (23 feet) from the RKE receiver.

Each transmitter has a different vehicle access code, which must be programmed into the memory of the RKE receiver in the vehicle in order to operate the RKE system. In addition, vehicles with the optional memory system must have their access codes programmed in the RKE receiver so that the molded-in numbers "1" or "2" on the back of the transmitter case coincide with the memory "1" and "2" buttons of the memory set switch in the vehicle.

Transmitter programming must be performed with a DRB scan tool. Refer to the proper Computers and Control Systems/Body Control Module/Testing and Inspection Procedures for the transmitter programming procedure.

The transmitter operates on two Duracell DL2O16 (or equivalent) batteries. Typical battery life is from one to two years. The transmitter cannot be repaired and, if faulty or damaged, it must be replaced.

Remote Keyless Entry Receiver
The Remote Keyless Entry (RKE) receiver is a radio frequency unit contained in the Passenger Door Module (PDM). The PDM also contains the program circuitry for the RKE system. The PDM is located inside the passenger side front door, and is secured to the door trim panel.

The RKE receiver is energized by one of up to three messages from the RKE transmitter; Unlock, Lock, or an optional 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 the optional Panic messages on the Chrysler Collision Detection (CCD) data bus.

These messages will result in the Driver Door Module (DDM) locking or unlocking the driver side front door, and/or the Body Control Module (BCM) initiating the proper Horn Chirp, Illuminated Entry, and Vehicle Theft Alarm functions. If the vehicle is equipped with the optional memory system, the proper CCD Unlock message will also result in the DDM initiating its memory recall functions.

For diagnosis of the RKE receiver, the PDM, the DDM, or the CCD data bus, refer to the proper Computers and Control Systems/Body Control Module/Testing and Inspection Procedures. The RKE receiver is only serviced as a unit with the PDM and, if faulty or damaged, the PDM unit must be replaced.

CIRCUIT OPERATION -- RKE
The Remote Keyless Entry (RKE) transmitter sends three unique signals to the radio frequency receiver in Passengers Door Module (PDM): LOCK, UNLOCK and PANIC. After it receives any one of the three signals, the PDM broadcasts the appropriate signal over the CCD bus.

CIRCUIT OPERATION -- POWER DOOR LOCKS
Circuit A25O from fuse 11 in the Power Distribution Center (PDC) powers circuit F81 through the circuit breaker in cavity 2 of the junction block. Circuit F81 supplies power to the Drivers Door Module (DDM) and the Passengers Door Module (PDM). The DDM and PDM operate the power door locks. Circuit Z1 provides ground for the power door locks.

The PDM contains the radio frequency receiver that receives the radio frequency signals from the Remote Keyless Entry (RKE) transmitter. After either the passenger door lock switch activates or it receives input from the RKE transmitter, the PDM sends the appropriate signal to the DDM over the CCD Bus. When the DRIVERS door lock switch activates, the DDM sends the appropriate signal to the PDM.

After receiving a LOCK signal, the DDM supplies battery voltage to the left front door lock motor on circuit P36. The DDM also connects circuit P34 from the motor to ground.

When the DDM receives the UNLOCK signal, it powers circuit P34 and grounds circuit P36.

After receiving a LOCK signal, the PDM supplies battery voltage to the right front door lock motor, rear door lock motors and liftgate lock motors on circuit P2. The PDM also connects circuit P34 from the motor to ground.

When the DDM receives the UNLOCK signal, it powers circuit P34 and grounds circuit P2.