Central Timer Module

Fig. 1 Central Timer Module (Base):

Fig. 2 Central Timer Module (High-Line/Premium):

CENTRAL TIMER MODULE
Three versions of the Central Timer Module (CTM) are available on this vehicle, a base version, a high-line version, and a premium version. Whichever version of the CTM the vehicle is equipped with, it is concealed under the driver side end of the instrument panel inboard of the instrument panel steering column opening, where it is secured to a stamped steel bracket that is integral to the instrument panel armature. The CTM is enclosed in a molded plastic housing with one (base) or two (high-line/premium) integral external connector receptacles that connect it to the vehicle electrical system through one (base) or two (high-line/premium) take outs with connectors from the instrument panel wire harness.

The base version of the CTM is used on base models of this 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 module and an intermittent wipe module in a single unit. The high-line version of the CTM is used on high-line vehicles. The high-line CTM provides all of the functions of the base version of the CTM, but also is used to control and integrate many additional electronic functions and features included on highline models. The premium version of the CTM is the same as the high-line version, but is used only on models equipped with the heated seat option.

The high-line and premium versions of the CTM utilize integrated circuitry and information carried on the Chrysler Collision Detection (CCD) data bus network along with many hard wired inputs 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 high-line or premium Central Timer Module (CTM) is located under the driver side end of the instrument panel, inboard of the instrument panel steering column opening. The high-line or premium CTM contains a microprocessor and software that allow it to provide many electronic functions and features not available with base version of the CTM, including the VTSS. The CTM provides all of the proper VTSS features and outputs based upon the monitored inputs. The CTM circuitry monitors hard wired switch inputs, as well as message inputs received from other vehicle electronic modules over the Chrysler Collision Detection (CCD) data bus network.


The Ram Truck utilizes three different modules to control various vehicle systems. The base model, or Integrated Electronic Module (IEM), does not communicate on the CCD bus and will not be addressed. The other two models are Central Timer Modules (CTM)s, a high line version, and a premium version. The high line version controls the following functions:

Automatic Door Lock - The high-line/premium CTM provides an optional automatic door lock feature (also known as rolling door locks). This is a programmable feature.

Central Locking - The high-line/premium CTM provides an optional central locking/unlocking feature.

Chimes - All versions of the CTM provide chime service through an integral chime tone generator.

Courtesy Lamps - The high-line/premium CTM provides courtesy lamp control with timed load shedding.

Door Lock Inhibit - The high-line/premium CTM provides a door lock inhibit feature.

Enhanced Accident Response - The high-line/ premium CTM provides an optional enhanced accident response feature. This is a programmable feature.

Heated Seats - The premium CTM controls the optional heated seat system by controlling the operation of the heated seat relay.

Illuminated Entry - The high-line/premium CTM provides a timed illuminated entry feature.

Intermittent Wipe Control - All versions of the CTM provide control of the intermittent wipe delay, and wipe-after-wash features.

Panic Mode - The high-line/premium CTM provides support for the optional RKE system panic mode features.

Power Lock Control - The high-line/premium CTM provides the optional power lock system features, including support for the automatic door lock and door lock inhibit modes.

Programmable Features - The high-line/premium CTM provides support for certain programmable features.

Remote Keyless Entry - The high-line/premium CTM provides the optional Remote Keyless Entry (RKE) system features, including support for the RKE Lock (with optional horn chirp), Unlock, Panic, 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.

Remote Radio Switch Interface - The high-line/premium CTM monitors and transmits the status of the optional remote radio switches.

Speed Sensitive Intermittent Wipe Control - The high-line/premium CTM provides the speed sensitive intermittent wipe feature.

Vehicle Theft Alarm - The high-line/premium CTM provides control of the optional Vehicle Theft Alarm features, including support for the central locking/unlocking mode.


The premium CTM is used only on vehicles equipped with the heated seat feature. The premium CTM will control the above functions and, in addition, controls the heated seat relay. The CTM is mounted to a bracket welded to the instrument panel inboard of the steering column, behind the kneeblocker. The connectors are a white 18-way and a green 14-way.


Diagnostics
The CTM is fully addressable with the DRB III (R) and it is the recommended method for diagnosis. The CTM reports 6 Diagnostic Trouble Codes. All of the inputs to the CTM can be read with the DRB III (R) and the outputs can be actuated. If the inputs are OK and the outputs can be cycled with the DRB III (R), the problem is usually the Central Timer Module.

Hard wired circuitry connects the 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. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

All versions of the CTM for this model are serviced only as a complete unit. Many of the electronic features in the vehicle controlled or supported by the high-line or premium versions of the CTM are programmable using the DRB III scan tool. However, if any of the CTM hardware components are damaged or faulty, the entire CTM unit must be replaced. The base version of the CTM and the hard wired inputs or outputs of all CTM versions can be diagnosed using conventional diagnostic tools and methods; however, for diagnosis of the high-line or premium versions of the CTM or the CCD data bus, the use of a DRBIII 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 base version of the CTM monitors only hard wired inputs and responds with the proper hard wired outputs. The microprocessor-based high-line/premium version of the 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 high-line/premium 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 high-line/premium 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 high-line/premium CTM the ability to control numerous accessory systems in the vehicle.

All versions of the CTM operate on battery current received through fuses in the Junction Block (JB) on a non-switched fused B(+) circuit, a fused ignition switch output (st-run) circuit (base version only), and a fused ignition switch output (run-acc) circuit (high-line/premium version only). 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. All versions of the CTM are grounded through their connector and take out of the instrument panel wire harness. The high- line/premium CTM has another ground received through a second connector and take out of the instrument panel wire harness. The first ground circuit receives ground through a take out with an eyelet terminal connector of the instrument panel wire harness that is secured by a nut to a ground stud located on the left instrument panel end bracket, while the second ground circuit (high-line/premium version only) receives ground through a take out with an eyelet terminal connector of the instrument panel wire harness that is secured by a nut to a ground stud located on the back of the instrument panel armature above the inboard side of the instrument panel steering column opening.

The high-line/premium 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 CTM include the following:
* CCD bus- - high-line/premium version only
* CCD bus+ - high-line/premium version only
* Cylinder lock switch mux - high-line premium version only
* Driver door ajar switch sense
* Fused B(+)
* Fused ignition switch output (run-acc) - high-line/premium version only
* Fused ignition switch output (st-run) - base version only
* Ground (one circuit - base version, two circuits - high-line/premium version)
* Key-in ignition switch sense
* Passenger door ajar switch sense - high-line/premium version only
* Power door lock motor B(+) lock - high-line/premium version only
* Power door lock motor B(+) unlock - high-line/ premium version only
* Radio control mux - high-line/premium version only
* Tone request signal
* Washer switch sense
* Wiper park switch sense
* Wiper switch mode sense
* Wiper switch mode signal

Hard Wired Outputs
The hard wired outputs of the CTM include the following:
* CCD bus- - high-line/premium version only
* CCD bus+ - high-line/premium version only
* Courtesy lamp switch output - high-line/premium version only
* Door lock driver - high-line/premium version only
* Door unlock driver - high-line/premium version only
* Headlamp relay control - high-line/premium version only
* Heated seat relay control - premium version only
* Horn relay control - high-line/premium version only
* VTSS indicator driver - high-line/premium version only
* Wiper motor relay control

Messaging
The high-line/premium 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 high-line/premium CTM provides the following messages to other electronic modules over the CCD data bus:
* Engine Enable (PCM)
* Radio Seek Up (Radio)
* Radio Seek Down (Radio)
* Radio Volume Up (Radio)
* Radio Volume Down (Radio)
* Preset Scan (Radio)