Dakota 4WD V6-3.9L VIN X (1997)
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 power lock and Remote Keyless Entry (RKE) systems are two of the systems that the high-line CTM controls. 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 signal inputs from the RKE transmitters. In response to those inputs, the internal programming of the CTM sends the
proper outputs to control the power lock motors, the horn relay, and the courtesy lamps.
Some of the features and functions of the power lock and Remote Keyless Entry (RKE) systems made possible because of the communication of
the CTM on the CCD data bus network include:
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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.
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An enhanced accident response feature will prevent the doors from locking, then unlock both doors after receiving a CCD message from the
ACM indicating a frontal impact 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 the vehicle is not moving. Of course, these responses
are dependent upon functional battery power and wiring circuitry following the impact.
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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). This feature can be enabled or disabled using the DRB
scan tool and the proper Diagnostic Procedures.
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A programmable feature of the RKE system is the enabling or disabling of the horn chirp following the RKE Lock function. This feature can
be enabled or disabled using the DRB scan tool and the proper Diagnostic Procedures.
The horn relay is one of the outputs that the high-line CTM can control. The high-line CTM is programmed to energize or de-energize the horn
relay in response to certain inputs from the Vehicle Theft Security System (VTSS) and the Remote Keyless Entry (RKE) system.
One of the features that the high-line 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 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 CTM also contains the receiver and control logic for the power lock and Remote Keyless Entry (RKE) systems, which are integrated into the
arming, disarming, and triggering functions of the VTSS.
Both versions of the CTM are mounted under the passenger side end of the instrument panel, behind the instrument panel top cover and outboard
of the glove box opening. For diagnosis of the base version of the CTM, refer to Wiper and Washer Systems or Chime/Buzzer Warning Systems.
For diagnosis of the high-line version of the CTM or 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.
Chime System
CHIME SYSTEM
The chime system is built into the CTM. The system also supports an external chime request from the instrument cluster. This feature allows the
instrument cluster to request a chime from the CTM for gauge problems and tell-tale warnings. 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 doors are 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 key-in and headlamp warning as long as the door is open. The seat belt warning
chime is activated for six seconds, and all other chime conditions will activate the chime once at the time the warning light on the cluster is
illuminated.
The chime will sound for the following conditions:
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Ignition oft, key in ignition, driver's door open
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Ignition oft, headlamps on, driver's door open
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Seat belt warning
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Check engine lamp illuminated (after prove-out)
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Airbag lamp illuminated (after prove-out)
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Anti-lock lamp illuminated (after prove-out if equipped)
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Check gauges lamp illuminated
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Low fuel
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Low washer fluid
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Engine temp critical
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Engine oil press too low
