Dodge Durango

 Service Manual

Power Lock Systems » Description and 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 base CTM also uses inputs from the door ajar switches, the headlamp switch and the key-in ignition switch to control the output to the dome lamp circuits, which allows the base CTM to provide load shedding to help protect the battery from becoming discharged.

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 highline 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.
• A central locking feature. Central locking allows all the doors and the liftgate to be locked when a key is used in either front door lock cylinder to lock either front door. Similarly, central locking will also unlock all the doors and the liftgate when the key is rapidly cycled twice to the unlock position in either front door lock cylinder. This feature uses inputs from the two door lock cylinder switches, which are components of the Vehicle Theft Security System (VTSS). Refer to Group 8Q - Vehicle Theft/Security Systems for more information on the door lock cylinder switches.
• 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-perhour (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 in the Removal and Installation section of Group 8E - Instrument Panel Systems for the service procedures.

The programmable features of the CTM can be enabled or disabled using the DRBIIIt scan tool as described in the proper Diagnostic Procedures manual.

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 section of Group 8U 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 DRBIIIt scan tool and the proper Diagnostic Procedures manual are recommended. The CTM cannot be repaired and, if faulty or damaged, it must be replaced.

Central timer module

Power lock switch

Power lock motor

Remote keyless entry transmitter

Remote keyless entry receiver

Driver unlock relay

Headlamp relay

Horn relay