Body Control Module

Fig. 1 Central Timer Module:

BODY CONTROL/[1][2]CENTRAL TIMER MODULE
A Central Timer Module ([1][2]CTM) is used on this vehicle when it is equipped with the optional Vehicle Theft Security System (VTSS). The CTM is concealed under the instrument panel, where it is secured with three screws to the inboard side of the left center instrument panel support above the engine housing. The CTM is enclosed in a molded plastic housing with two integral external connector receptacles that connect it to the vehicle electrical system through two take outs with connectors from the instrument panel wire harness.

In addition to serving as the security system module, the [1][2]CTM combines the functions of a chime/buzzer module, an intermittent wipe module, an illuminated entry module, and a Remote Keyless Entry (RKE) module into a single unit. The CTM utilizes integrated circuitry and information carried on the Chrysler Collision Detection (CCD) data bus network along with many hard wired circuits to monitor many sensor and switch inputs throughout the vehicle. In response to those inputs, the internal circuitry and programming of the CTM allow it to control and integrate many electronic functions and features of the vehicle through both hard wired outputs and the transmission of electronic message outputs to other electronic modules in the vehicle over the CCD data bus.

The features that the [1][2]CTM supports or controls include the following:
- Automatic Door Lock - The [1][2]CTM provides an optional automatic door lock feature (also known as rolling door locks). This is a programmable feature.
- Central Locking - The [1][2]CTM provides a central locking/unlocking feature.
- Chimes - The [1][2]CTM provides chime service through an integral chime tone generator.
- Courtesy Lamps - The [1][2]CTM provides courtesy lamp control with timed load shedding.
- Door Lock Inhibit - The [1][2]CTM provides a door lock inhibit feature.
- Enhanced Accident Response - The [1][2]CTM provides an optional enhanced accident response feature. This is a programmable feature.
- Illuminated Entry - The [1][2]CTM provides a timed illuminated entry feature.
- Intermittent Wipe Control - The [1][2]CTM provide control of the intermittent wipe delay, and wipe-after- wash features.
- Power Lock Control - The [1][2]CTM provides the power lock system features, including support for the automatic door lock and door lock inhibit modes.
- Programmable Features - The [1][2]CTM provides support for certain programmable features.
- Remote Keyless Entry - The [1][2]CTM provides the Remote Keyless Entry (RKE) system features, including support for the RKE Lock (with optional horn chirp), Unlock, and illuminated entry modes, as well as the ability to be programmed to recognize up to four RKE transmitters. The RKE horn chirp is a programmable feature.
- Speed Sensitive Intermittent Wipe Control - The high-line/premium [1][2]CTM provides the speed sensitive intermittent wipe feature.
- Vehicle Theft Alarm - The [1][2]CTM provides control of the optional Vehicle Theft Alarm features, including support for the central locking/unlocking mode.

Hard wired circuitry connects the [1][2]CTM to the electrical system of the vehicle. These hard wired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other, to the vehicle electrical system and to the CTM through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators.

The [1][2]CTM for this model is serviced only as a complete unit. Many of the electronic features in the vehicle controlled or supported by the CTM are programmable using the DRB III scan tool. In addition, the CTM software is Flash compatible, which means it can be reprogrammed using Flash reprogramming procedures. However, if any of the CTM hardware components are damaged or faulty, the entire CTM unit must be replaced. The hard wired inputs or outputs of the CTM can be diagnosed using conventional diagnostic tools and methods; however, for diagnosis of the CTM, the CCD data bus, or the electronic message inputs to or outputs from the CTM, the use of a DRB III scan tool is required. Refer to the appropriate diagnostic information.

The Central Timer Module (CTM) is designed to control and integrate many of the electronic features and functions of the vehicle. The microprocessor-based [1][2]CTM monitors many hard wired switch and sensor inputs as well as those resources it shares with other electronic modules in the vehicle through its communication over the Chrysler Collision Detection (CCD) data bus network. The internal programming and all of these inputs allow the CTM microprocessor to determine the tasks it needs to perform and their priorities, as well as both the standard and optional features that it should provide. The CTM programming then performs those tasks and provides those features through both CCD data bus communication with other electronic modules and through hard wired outputs to a number of circuits, relays, and actuators. These outputs allow the CTM the ability to control numerous accessory systems in the vehicle.

The [1][2]CTM operates on battery current received through fuses in the fuse block on a non-switched fused B(+) circuit, a fused ignition switch output (run-start) circuit, and two fused ignition switch output (run-acc) circuits. This arrangement allows the CTM to provide some features regardless of the ignition switch position, while other features will operate only with the ignition switch in the Accessory, ON, and/or Start positions. The CTM is grounded through its connectors and take outs of the instrument panel wire harness. One ground circuit receives ground through a take out with an eyelet terminal connector of the instrument panel wire harness that is secured by a ground screw to instrument panel left center support, while the second ground circuit receives ground through a take out with an eyelet terminal connector of the instrument panel wire harness that is secured by a ground screw to the back of the cross body member of the instrument panel structural support.

The [1][2]CTM monitors its own internal circuitry as well as many of its input and output circuits, and will store a Diagnostic Trouble Code (DTC) in electronic memory for any failure it detects. These DTCs can be retrieved and diagnosed using a DRB III scan tool. Refer to the appropriate diagnostic information.

Hard Wired Inputs
The hard wired inputs to the [1][2]CTM include the following:
- Auxiliary door ajar switch sense
- CCD bus-
- CCD bus+
- Cylinder lock switch mux
- Driver door ajar switch sense
- Fused B(+)
- Fused ignition switch output (run-acc) - two circuits
- Fused ignition switch output (run-start)
- Ground - two circuits
- Key-in ignition switch sense
- Passenger door ajar switch sense
- Power door lock motor B(+) lock
- Power door lock motor B(+) unlock
- Washer switch sense
- Wiper park switch sense
- Wiper switch mode sense
- Wiper switch mode signal

Hard Wired Outputs
The hard wired outputs of the [1][2]CTM include the following:
- CCD bus-
- CCD bus+
- Courtesy lamp switch output
- Door lock driver
- Door unlock driver
- Headlamp relay control
- Horn relay control
- VTSS indicator driver
- Wiper motor relay control

Messaging
The [1][2]CTM uses the following messages received from other electronic modules over the CCD data bus:
- Airbag Deploy (ACM)
- Charging System Failure (PCM)
- Engine RPM (PCM)
- System Voltage (PCM)
- Vehicle Speed (PCM)
- Voltage Fault (PCM)

The [1][2]CTM provides the following messages to other electronic modules over the CCD data bus:
- Engine Enable (PCM)