Central Timer Module Description

[1][2]CENTRAL TIMER MODULE

DESCRIPTION
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 [1][2]CTM is used on base models of the vehicle. It is also sometimes referred to as the Integrated Electronic Module (IEM). The base version of the CTM combines the functions of a chime/buzzer module, an intermittent wipe module, and an ignition lamp time delay relay in a single unit. The base version CTM does not communicate on the CCD bus.

The high-line version of the [1][2]CTM is used on high-line 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.

One of the features that the high-line [1][2]CTM supports and controls is the Vehicle Theft Security System (VTSS). In the VTSS, the CTM receives hard-wired inputs from the door jamb, door lock cylinder, and ignition switches. The programming in the CTM allows it to process the information from these inputs and send control outputs to energize or de-energize the headlamp (or security) relay, horn relay, and the security lamp. The CTM also sends CCD data bus messages to the Powertrain Control Module (PCM) to control the engine no-run feature of the VTSS.

The [1][2]CTM is located on the right side of the steering column behind the kneeblocker on a metal bracket welded to the instrument panel. It contains a white 8-way and a green 14-way connector. For diagnosis of the high-line version of the CTM or the CCD data bus, the use of 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.

The high-line Central Timer Module (CTM) can also control some features of the audio system when the vehicle is equipped with the optional RAZ radio receiver and remote radio switches. A high-line [1][2]CTM is used on high-line versions of this vehicle. The CTM combines the functions of a chime/buzzer module, an intermittent wipe module, an illuminated entry module, a remote keyless entry module, and a vehicle theft security system module in a single unit.

The high-line [1][2]CTM also controls and integrates many of the additional electronic functions and features included on models with this option. The RAZ radio receiver with a remote radio switch option is one of the features that the CTM controls. The CTM is programmed to send switch status messages over the Chrysler Collision Detection (CCD) data bus to control the volume, seek, and pre-set station advance functions of the RAZ radio receiver. The CTM monitors the status of the remote radio switches located on the steering wheel through a hard wired circuit. The CTM then sends the proper switch status messages to the radio receiver. The electronic circuitry within the radio receiver responds to the switch status messages it receives by adjusting the radio settings as requested.

Refer to Remote Radio Switch Description and Operation for more information on this component.
Remote Switch

In addition radio receivers connected to the CCD data bus have several audio system functions that can be diagnosed using a DRB scan tool. Refer to the proper Diagnostic Procedures for more information on DRB testing of the audio systems.

The high-line Central Timer Module (CTM) can also operate the horn system. A high-line [1][2]CTM is used on high-line versions of this vehicle. The CTM combines the functions of a chime/buzzer module, an intermittent wipe module, an illuminated entry module, a remote keyless entry module, and a vehicle theft security system module in a single unit.

The high-line [1][2]CTM also controls and integrates many of the additional electronic functions and features included on models with this option. The horn relay is one of the hard wired outputs of the CTM. The high-line CTM is programmed to energize or deenergize the horn relay in response to certain inputs from the Vehicle Theft Security System (VTSS) and/or the Remote Keyless Entry (RKE) system.

Refer to Vehicle Theft Security System Description and Operation for more information on the VTSS. Refer to Power Lock Systems / Remote Keyless Entry System Description and Operation for more information on the RKE system.
Description and Operation

Both the base and the high-line versions of the [1][2]CTM support the intermittent wipe and wipe-after-wash features, but only the high-line CTM supports the speed sensitive intermittent wipe. The intermit-tent wipe relay is one of the outputs that both the base and the high-line versions of the CTM can control. Each CTM is programmed to energize or de-energize the intermittent wipe relay in response to certain inputs from the windshield wiper and washer switches and from the windshield wiper motor park switch.

For the speed sensitive intermittent wipe feature, the high-line [1][2]CTM also uses vehicle speed messages, which are received on the CCD data bus from the Powertrain Control Module (PCM).

See Wiper System Testing and Inspection for diagnosis of the base version of the [1][2]CTM.
Testing and Inspection

For diagnosis of the high-line version of the [1][2]CTM or the CCD data bus, refer to Body Control Module Testing and Inspection.
Testing and Inspection

The [1][2]CTM cannot be repaired and, if faulty or damaged, it must be replaced.

The high-line [1][2]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 (or security) 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 [1][2]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 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 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 mode.

- An enhanced accident response feature will unlock both doors, then prevent the power door locks from locking the doors 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 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 [1][2]CTM are mounted under the driver side end of the instrument panel, inboard of the instrument panel steering column opening. Refer to [1][2]Central Timer Module Replacement of Instrument Panel Systems for the service procedures.

The programmable features of the [1][2]CTM can be enabled or disabled using the DRB scan tool as described in the proper Diagnostic Procedures. 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.

OPERATION
Some of the functions and features that the [1][2]CTM supports or controls include:
- Chimes for the following conditions:
- Headlamps on with ignition off and driver door open warning
- Key in ignition with ignition off and driver door open warning
- ABS lamp warning (if the vehicle is so equipped)
- Airbag lamp warning
- Check engine lamp warning
- Check gauges lamp warning
- Low fuel lamp warning
- Low washer fluid lamp warning
- Seat belt reminder lamp warning
- Transmission oil temperature lamp warning (automatic transmission)
- Courtesy lamp time-out (high-line only)
- Ignition key lamp timer
- Intermittent wipe control
- Enhanced accident response (high-line only)
- Horn chirp upon door lock with RKE (programmable) (high-line only)
- Illuminated entry (high-line only)
- Power door lock control (high-line only)
- Power lock inhibit (high-line only)
- Remote Keyless Entry (RKE) (high-line only)
- Remote radio switches (high-line only)
- Rolling door locks (programmable) (high-line only)
- Speed sensitive intermittent wipe (high-line only)
- Vehicle Theft Security System (VTSS) (high-line only) (if the vehicle is so equipped)
- Wipe after wash (high-line only).

[1][2]CENTRAL TIMER MODULE DIAGNOSTIC TROUBLE CODES
Door Disarm Switch Failure
Door lock Switch Failure
Door Unlock Switch Failure
Wiper Park Switch Failure
EEPROM Checksum Failure
Internal ROM Test Failure