RAM 1500 Van V8-5.2L CNG VIN T (1999)
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
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Key in Warning ignition off, key in ignition, driver's door open
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Ignition off, headlamps ON, driver's door open
Low rate
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Seat belt warning - 6 seconds after key on (6 to 8 chimes) or until seatbelt is buckled
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Airbag lamp illuminated (3 times after prove-out)
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ABS lamp illuminated (2 chimes after prove-out if equipped)
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Check engine lamp illuminated (2 chimes after prove-out)
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Check gauges lamp illuminated (2 chimes)
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Engine Temp High - when gauge enters red zone (2 chimes)
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Low fuel - when fuel level reaches 1/8 tank (2 chimes)
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Low washer fluid (2 chimes)
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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.
Description and Functional Operation
DESCRIPTION AND FUNCTIONAL OPERATION
The body system on the 1999 AB HIGH LINE consists of three modules that communicate over the CCD bus (Chrysler Collision Detection
multiplex system). There are two additional modules, the Powertrain Control Module (PCM) and the Controller Anti-Lock Brake (CAB) that are
not part of the body system, but do utilize the CCD bus for communication. The CAB also utilizes the bus for diagnostics. The PCM sends and
receives messages on the CCD bus, however diagnostics are performed through the Serial Communication Interface of SCI, the same as previous
years. All of the information about the functioning of all the system is organized, controlled, and communicated by (CCD Bus).
Through the CCD bus, information about the operation of vehicle components and circuits is relayed quickly to the appropriate module(s). All
modules receive all the information transmitted on the bus even though a module may not require all the information to perform it's function. It
will only respond to messages "addressed" to it through a binary coding process. This method of data transmission significantly reduces the
complexity of the wiring in the vehicle and the size of wiring harnesses.
DRB III Error Messages and Blank Screen
DRB III ERROR MESSAGES AND BLANK SCREEN
Under normal operation, the DRB will display one of only two error messages:
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User-Requested WARM Boot or
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User-Requested COLD Boot
If the DRB should display any other error message, record the entire display and call the MDS Hotline, or call for information and assistance at
1-800-825-8737. This is a sample of such an error message display:
ver: 2.14
date: 26 Jul93
file: key_itf.cc
date: Jul 26 1993
line: 548
err: Ox1
User-Requested COLD Boot
Press MORE to switch between this display and the application screen.
Press F4 when done noting information.
DRB III Does Not Power Up (Blank Screen)
If the LED's do not light or no sound is emitted at start up, check for loose cable connections or a bad cable. Check the vehicle battery voltage
(Data Link Connector cavity 16). A minimum of 11 volts is required to adequately power the DRB.
If all connections are proper between the DRB and the vehicle or other devices, and the vehicle battery is fully charged, and inoperative DRB may
be the result of a faulty cable or vehicle wiring.
