Dodge 2000 DURANGO Service Manual page 388

8K - 4 WIPER AND WASHER SYSTEMS
DESCRIPTION AND OPERATION (Continued)
also has an integral illumination lamp with a ser-
viceable bulb. Both the rear wiper and rear washer
motors will operate continuously for as long as the
switch is held in the momentary Wash position.
The rear wiper and washer switch cannot be
repaired and, if faulty or damaged, the entire rear
window switch pod must be replaced.
CENTRAL TIMER MODULE
Two versions of the Central Timer Module (CTM)
are available on this vehicle, a base version and a
high-line version. The base version of the CTM is
used on base models of the vehicle. The base version
of the CTM combines the functions of a chime/buzzer
module and an intermittent wipe module into a sin-
gle unit. The base CTM also uses inputs from the
door ajar switches, the headlamp switch and the
key-in ignition switch to control the output to the
dome lamp circuits, which allows the base CTM to
provide load shedding to help protect the battery
from becoming discharged.
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 CTM, but also is used to
control and integrate many of the additional elec-
tronic functions and features included on the high-
line models. The high-line version of the CTM
contains a central processing unit and interfaces with
other modules in the vehicle on the Chrysler Colli-
sion Detection (CCD) data bus network.
The CCD data bus network allows the sharing of
sensor information. This helps to reduce wire har-
ness 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.
Both the base and the high-line versions of the
CTM support the intermittent wipe and wipe-after-
wash features, but only the high-line CTM supports
the speed sensitive intermittent wipe. The intermit-
tent wipe relay is one of the outputs that both the
base and the high-line versions of the CTM can con-
trol. Each CTM is programmed to energize or de-en-
ergize the intermittent wipe relay in response to
certain inputs from the windshield wiper and washer
switches and from the windshield wiper motor park
switch.
For the speed sensitive intermittent wipe feature,
the high-line CTM also uses vehicle speed messages,
which are received on the CCD data bus from the
Powertrain Control Module (PCM). Refer to Group 14
- Fuel Systems for more information on the PCM and
the PCM inputs.
Both versions of the CTM are mounted under the
passenger side end of the instrument panel, outboard
of the instrument panel glove box opening. Refer to
Central Timer Module in the Removal and Installa-
tion section of Group 8E - Instrument Panel Systems
for the service procedures.
See Wiper System in the Diagnosis and Testing
section of this group for diagnosis of the base version
of the CTM. For diagnosis of the high-line version of
the CTM or the CCD data bus, a DRBIII scan tool
and the proper Diagnostic Procedures manual are
recommended. The CTM cannot be repaired and, if
faulty or damaged, it must be replaced.
INTERMITTENT WIPE RELAY
The intermittent wipe relay is a International
Standards Organization (ISO) micro-relay. The termi-
nal designations and functions are the same as a con-
ventional ISO relay.
terminal orientation (or footprint) is different, cur-
rent capacity is lower, and the relay case dimensions
are smaller than those of the conventional ISO relay.
The intermittent wipe relay is a electromechanical
device that switches battery current to the wind-
shield wiper motor or wiper motor park switch when
the relay coil is grounded by the Central Timer Mod-
ule (CTM) in response to inputs from the windshield
wiper (multi-function) switch. See Intermittent Wipe
Relay in the Diagnosis and Testing section of this
group for more information.
The intermittent wipe relay is located in the Power
Distribution Center (PDC), in the engine compart-
ment. Refer to the PDC label for relay identification
and location.
The intermittent wipe relay cannot be repaired
and, if faulty or damaged, it must be replaced.
WASHER RESERVOIR
The washer fluid reservoir is integral to and
located on the right end of the upper radiator shroud
in the engine compartment. Both the washer pump
and motor unit and the washer fluid level sensor
have barbed nipples, which are installed through a
rubber grommet seal inserted in holes on the right
end of the upper radiator shroud and reservoir unit.
The washer pump and washer fluid level sensor are
retained by an interference fit between the barbed
nipple and the grommet seal, which is a light press
fit.
The washer reservoir has a snap-fit filler cap with
a rubber gasket. The cap hinges on and is secured to
a molded-in hook formation on the top of the fan
shroud, just inboard of the reservoir filler neck. The
washer reservoir grommet seals and filler cap are
each available for service. The washer reservoir is
serviced only as a unit with the upper radiator
shroud. Refer to Group 7 - Cooling System for the
upper radiator shroud service procedures.
However, the micro-relay
DN