Durango 2WD V8-5.2L VIN Y (1999)
DRB III. The system may be disarmed by either an unlock command from a valid RKE key fob or by using a key in the lift gate or either door.
Both front door key cylinders and the lift gate are equipped with disarm switches. There is also a VTSS lamp on the dash that provides information
to the driver about the state of the vehicle theft system.
The RKE system is placed in the programming mode by the DRB, or by using the customer programming sequence. The system will store up to
four key fob codes. Two fobs are supplied with the truck, additional fobs may be purchased through parts department. The additional fobs can be
programmed with the DRB III, or by using the customer programming sequence. Through the DRB III, erasing and programming of one key fob
without deleting the others is possible. If the key fob is stolen, all the fob codes stored previously may be erased to provide the owner of the
vehicle with an extra sense of security.
Speed Sensitive Intermittent Wipers
The DN truck equipped with a highine CTM will utilize speed sensitive intermittent wipers. Only a highine CTM Will be able to support this
feature. A base CTM will provide for intermittent wipers without the speed sensitive feature. The low and high speeds are controlled through the
wiper stalk switch. The intermittent portion of the wiper control is handled by the CTM through the intermittent wiper relay. When the module
detects a decrease in delay time as selected by the driver, an immediate wipe of the windshield takes place and the new delay interval is
implemented.
Diagnostics
The CTM is fully addressable with the DRB III 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 and the outputs can be actuated.
VEHICLE COMMUNICATION
The Chrysler Collision Detection multiplex system (CCD bus) consists of a twisted pair of wires. These wires run from one module to another.
They receive and deliver coded information between the modules. The information is coded to identify the message as well as the importance of
the message. When there are multiple messages trying to access the CCD bus at one time, the code determines the message that has the highest
priority, and is then allowed to access the bus first.
The two wires of the twisted pair that make up the CCD multiplex system are called "bus +" (bus plus) and "bus -" (bus minus) respectively. Each
wire has a measureable voltage level of roughly 2.5 volts. In order to maintain the 2.5 volts on each line and provide a means of transportation for
the coded messages, there is a "voltage divider network" located in the module that supplies bus bias or voltage. Along with the module that
supplies bias, some modules provide termination. Bias is the voltage necessary to make the bus operational. At least one point of termination is
necessary, some systems may use more than one. Some modules are capable of both biasing and terminating. Termination in the circuitry (a 120
ohm resistor placed across the bus) is required to complete the voltage divider network circuit and also provide some electromagnetic protection
for the bus. In this vehicle, the bias is supplied by the instrument cluster and termination is provided by the PCM and the instrument cluster.
Without termination, voltage on the bus goes to approximately 5 volts on one wire and 0 volts on the other wire.
NOTE: Communication over the bus is essential to the proper operation of the vehicle's on-board diagnostic systems and the DRB III. Problems
with the operation of the bus or DRB III must corrected before proceeding with diagnostic testing.
Bus Failure Messages
Short to Battery - Either or both of the bus wires are shorted to the battery potential, or
Open ground to any CCD bus module.
Short to 5 Volts - Either or both of the bus wires are shorted to a 5-volt potential.
Short to Ground - Either or both of the bus wires are shorted to ground.
Bus (+) L Bus (-) Shorted Together - The two bus wires are shorted together.
No Termination - The bus system has lost connection with all of its terminators.
Bus Bias Level Too Low - Either of both of the bus wire potentials are significantly below their normal 2.5 volts.
Bus Bias Level Too High - Either of both of the bus wire potentials are significantly above their normal 2.5 volts.
No Bus Bias - The bus system has lost connection with the Instrument Cluster.
Bus (+) Open - The bus (+) wire has lost connection with termination and/or bias.
Bus (-) Open - The bus (-) wire has lost connection with termination and/or bias.
Not receiving Bus Messages Correctly - The DRB cannot communicate over the bus and does not know why.
AIRBAG DIAGNOSTIC TROUBLE CODES
Airbag diagnostic trouble codes consist of active and stored codes. If more than one code exists, diagnostic priority should be given to the active
