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Fig.1 Door Module:

POWER LOCK SYSTEM
Power Lock System
The power lock system includes the power lock switches integral to the Driver Door Module (DDM) and the Passenger Door Module (PDM) located in the front doors, and the power lock motors mounted in each door and the liftgate. The power lock system control circuitry and the power lock and unlock relays are integral to the PDM.

The power lock system includes a lock inhibit feature, which prevents the doors from being locked by the power lock system if the driver door is open with the key in the ignition switch, or with the headlamp switch in the ON position. However, the lock inhibit feature will not prevent manual locking of the vehicle using the manual lock buttons or the key cylinders.

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 on battery current supplied on a non-switched fused B(+) circuit through a fuse in the Junction Block (JB) so that the system remains operational regardless of the ignition switch position.

Refer to the owner's manual in the vehicle glove box for more information on the features, use and operation of the power lock system.

Remote Keyless Entry System
The Remote Keyless Entry (RKE) system consists of the RKE key fob radio transmitter and an RKE module that contains a radio receiver and the program logic. The RKE module is installed in an RKE mini-dome lamp housing on the headliner of the vehicle, or in the housing of the optional overhead console, depending upon how the vehicle is equipped.

The RKE system for this vehicle also features a customer programmable horn chirp feature. This feature allows the customer the option of enabling or disabling the horn chirp request that the RKE receiver issues as an audible indication that a valid Lock signal has been received from the RKE transmitter. For more information on programing this feature, (Refer to POWER LOCKS/REMOTE KEYLESS ENTRY MODULE - STANDARD PROCEDURE - REMOTE KEYLESS ENTRY MODULE PROGRAMMING).

The RKE system can retain the vehicle access codes of up to four 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 III scan tool. Refer to the appropriate diagnostic information.

The Remote Keyless Entry (RKE) system is a radio frequency system that allows the use of a remote battery-powered radio transmitter to control the power lock system. On vehicles with the RKE option, the power locks can be operated by depressing the Lock or Unlock buttons of the RKE transmitter. The RKE system includes an illuminated entry feature, which turns ON the courtesy lamps for a timed interval (about thirty seconds) when the vehicle is unlocked using the RKE transmitter.

Refer to the owner's manual in the vehicle glove box for more information on the features, use and operation of the RKE system.

POWER LOCK MOTOR
In the power lock and Remote Keyless Entry (RKE) systems, the door and liftgate locks are each actuated by a dedicated reversible electric motor mounted within each door and the liftgate. The power lock motor direction is controlled by the battery and ground feeds from the power lock and unlock relays integral to the Passenger Door Module (PDM).

The power lock motors in the doors cannot be repaired and, if faulty or damaged, the entire door latch must be replaced. The power lock motor for the liftgate is available for service separate from the liftgate latch.

The power lock motor direction is controlled by the battery and ground feeds from the power lock and unlock relays integral to the Passenger Door Module (PDM).

Fig.3 Door Module:

DOOR MODULE
A Driver Door Module (DDM) and a Passenger Door Module (PDM) are used on all models equipped with power locks and power windows. Each door module houses both the front door power lock and power window switches. In addition to the switches for its own door, the DDM houses individual switches for each passenger door power window, a power window lockout switch, the power mirror switch, and circuitry to support the one-touch down feature of the driver side front door power window. The PDM also houses the control circuitry and the power lock and unlock relays for the power lock system.

The DDM and the PDM are mounted to their respective front door trim panels. The DDM and PDM are serviced individually and cannot be repaired. If the DDM or PDM, or any of the switches and circuitry that they contain are faulty or damaged, the entire DDM or PDM unit must be replaced.

The role of the Passenger Door Module (PDM) in the power lock system is to receive inputs from the battery, the ignition switch, the Driver Door Module (DDM), the driver door ajar switch, the key-in ignition switch, and the headlamp switch. It also receives a hard wired input from the Remote Keyless Entry (RKE) module, if the vehicle is so equipped. In response to these inputs, the PDM sends the proper outputs to control the power lock motors through its integral power lock and unlock relays.