Power Locks: Description and Operation

INTRODUCTION
Power door locks are optional factory-installed equipment on this model. The Remote Keyless Entry (RKE) system, illuminated entry system and power windows are included on vehicles equipped with the power door lock option.

The CTM controls the door lock actuator assemblies to handle locking and unlocking with the key fob or interior switch. There is also a door lock inhibit feature that prevents power locking of the doors if the ignition is OFF, the door is open, and the key is in the ignition. Automatic or "rolling locks" are included as a DRB III, or customer programmable feature. If the vehicle is moving approximately 15 mph and approximately 10 degrees of throttle opening is seen by the PCM, (the PCM will send this info to the CTM via the CCD bus) indicating acceleration, the CTM will cycle the lock actuators to lock the doors.

Power Lock System
The power lock system allows all four doors and the liftgate to be locked or unlocked electrically by operating the switch on either front door trim panel. The power lock system operates on non-switched battery current supplied through a fuse in the junction block so that the system remains functional, regardless of the ignition switch position.

The power lock system includes the power lock switches on each front door trim panel, and the power lock motors inside each door and the liftgate. The power lock control circuitry and the power lock and unlock relays are integral to the high-line version of the Central Timer Module (CTM), which is mounted under the instrument panel.

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.

SYSTEM OPERATION
Central Timer Module
Two versions of the Central Timer Module (CTM) are available on this vehicle, a base version and a high-line version. The base version of the CTM is used on base models of the vehicle. The base version of the CTM combines the functions of a chime/buzzer module, an intermittent wipe module, and an illuminated entry module into a single unit.

The high-line version of the CTM is used on highline vehicles. The high-line CTM provides all of the functions of the base version CTM, but also is used to control and integrate many of the additional electronic functions and features included on the high- line models. The high-line version of the CTM 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.

The high-line CTM controls features and functions of the power lock, illuminated entry, and Remote Keyless Entry (RKE) systems. The high-line CTM receives hard wired inputs from the power lock switches, CCD message inputs from the Powertrain Control Module (PCM) and Airbag Control Module (ACM), and coded radio frequency inputs from the RKE transmitters. In response to those and many other inputs, the internal programming of the CTM sends the proper outputs to control the power lock motors, the headlamp and horn relays, and the courtesy lamps.

Some of the features and functions of the power lock, illuminated entry and RKE systems made possible because of the communication of the CTM on the CCD data bus network include:

- A door-lock inhibit feature which prevents the power lock system from being energized with a power door lock switch when the driver door is open if the key is in the ignition and/or the headlamps are on. However, the locks can still be operated manually, with a key, or energized with the RKE transmitter.

- A programmable driver door unlock feature. The driver door unlock feature allows one press of the RKE transmitter Unlock button to unlock just the driver door, and a second press within five seconds to unlock all doors and the liftgate. If disabled, one press of the RKE transmitter Unlock button will unlock all doors and the liftgate.

- A panic mode feature which can provide additional personal security and protection. When the Panic button on the RKE transmitter is depressed the vehicle horn will pulse, the headlights will flash, and the interior lights will illuminate on the vehicle for about three minutes, or until the Panic button is depressed a second time. A vehicle speed of about 24 kilometers-per-hour (15 miles-per-hour) will also cancel the panic event.

- An enhanced accident response feature will unlock all doors and the liftgate, then prevent the power door lock system from locking the doors and liftgate for a predetermined time interval, after receiving a CCD message from the ACM indicating a frontal impact of the vehicle requiring airbag deployment. This feature will also turn on the courtesy lamps ten seconds after receiving the ACM deployment message, if the CCD vehicle speed message from the PCM indicates that the vehicle is not moving. Of course, these responses are dependent upon functional battery power and wiring circuitry following the impact.

- Rolling door locks is a programmable feature of the power lock system. This 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).

- A programmable feature of the RKE system is the enabling or disabling of the horn chirp following activation of the RKE Lock function. This feature can be enabled or disabled and, if enabled, the horn chirp duration (twenty or forty milliseconds) can be selected.

- Both versions of the CTM are mounted under the passenger side end of the instrument panel, outboard of the instrument panel glove box opening. Refer to Central Timer Module/Service and Repair of Instrument Panel Systems for the service procedures.

- The programmable features of the CTM can be enabled or disabled using the DRB scan tool as described in the proper Diagnostic Procedures. These features can also be enabled/disabled using the customer programmable feature. See the owner's manual in the vehicle glove box for more information on the customer programmable feature. Refer to Central Timer Module in the Diagnosis and Testing for diagnosis of the base version of the CTM. For diagnosis of the high-line version of the CTM or of the CCD data bus, a DRB scan tool and the proper Diagnostic Procedures are recommended. The CTM cannot be repaired and, if faulty or damaged, it must be replaced.