Central Timer Module
CENTRAL TIMER MODULEThe AB RAM VAN has two different body electrical systems, High Line and Base. The High Line utilizes a Central Timer Module (CTM) to provide the body features listed below. The CTM was designed to reduce cost, wiring complexity, and improve the system reliable. The CTM 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 information between modules and diagnostic capability using the DRBIII(R). The CTM equipped vehicles can be identified by the sound of a Key-In Ignition CHIME.
The Base AB RAM VAN body system is composed of individual modules. Because the stand-alone modules do not communicate on the CCD Bus they cannot be diagnosed using the DRB.
The CTM provides the following features:
* CCD Bus Communication Central Locking Features
* Chime
* Courtesy Lamp Controls/Illuminated Entry
* Enhanced Accident Response
* Intermittent Wiper Delay
* Power Door Locks W/RKE
* Remote Keyless Entry (RKE)
* Speed Sensitive Intermittent Wipers
* Vehicle Theft Security System (VTSS)
The module is located on the left center instrument panel support. It contains a white 18-way and a green 14-way connector.
Chime System
The Mechanical Instrument Cluster (MIC) and the Central Timer Module (CTM) each both contain chime tone generators. The MIC supports the cluster-based chime warning features and the CTM supports the body-based chime warning features. There are two chime rates, Low; 50 chimes per minute for reminders and High; 180 chimes per minute for serious conditions that require immediate attention. The high rate chime sounds when the key is left in the ignition and the driver door is open or the headlights are left on. The low rate chime sounds for any of the other conditions. There is a variable rate feature that allows the chime to sound continuously for the key-in, and headlamp warning, as long as the drivers door is open. The seat belt warning chime is activated for 4 to 6 seconds, and all other chime conditions will activate the chime once at the same time the warning light on the cluster is illuminated.
The chime will sound for the following conditions:
High Rate
* Key in Warning ignition OFF, key in ignition, driver's door open
* Ignition OFF, headlamps on, driver's door open
Low Rate
* Seat belt warning-6 seconds after key on (6 to 8 chimes) or until seatbelt is buckled
* Airbag lamp illuminated (3 times after prove-out)
* ABS lamp illuminated (2 chimes after prove-out if equipped)
* Check engine lamp illuminated (2 chimes after prove-out)
* Check gauges lamp illuminated (2 chimes)
* Engine Temp-High-when gauge enters red zone (2 chimes)
* Low fuel - when fuel level reaches 1/8 tank (2 chimes)
* Low washer fluid (2 chimes)
* Transmission Temperature High (2 chimes)
If the ignition switch is turned to the run/start position and the driver's door is closed, then opened, the warning chime is defeated. This allows the doors to be open without the warning chime constantly sounding. The CTM stays in this mode until the ignition switch is turned to the "off" position, then normal function will be restored.
Fig. 1 Central Timer Module:
BODY CONTROL/CENTRAL TIMER MODULE
A Central Timer Module (CTM) is used on this vehicle when it is equipped with the optional Vehicle Theft Security System (VTSS). The CTM is located under the instrument panel, secured to the left center instrument panel support.
In addition to serving as the security system module, the CTM combines the functions of a chimel 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 CTM will control and integrate many functions and features of the vehicle through both hard wired outputs and the transmission of messages to other modules in the vehicle over the CCD data bus.
The features that the CTM supports or controls include the following:
* Automatic Door Lock
* Central Locking
* Chimes
* Courtesy Lamps
* Door Lock Inhibit
* Enhanced Accident Response
* Illuminated Entry
* Intermittent Wipe Control
* Power Lock Control
* Programmable Features Remote Keyless Entry
* Speed Sensitive Intermittent Wipe Control
* Vehicle Theft Alarm
Hard wired circuitry connects the CTM to the electrical system of the vehicle. Refer to the appropriate wiring information.
The CTM for this model is serviced only as a unit. Many of the 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. 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) controls and integrates many of the features and functions of the vehicle. The CTM monitors many hard wired switch and sensor inputs as well as those resources it shares with other modules in the vehicle through its communication over the Chrysler Collision Detection (CCD) data bus network. The programming and all of these inputs allow the CTM to determine the tasks it needs to perform and their priorities. The CTM then performs those tasks and provides those features through both CCD data bus communication with other 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.
The CTM operates on battery current received through fuses 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. The CTM is grounded to the chassis through the instrument panel left center support and the back of the cross body member of the instrument panel support.
The 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:
* 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 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 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 CTM provides the following messages to other electronic modules over the CCD data bus:
* Engine Enable (PCM)