Dodge Durango (DN). Manual — part 296

WIPER MOTOR

FRONT

The two-speed permanent magnet wiper motor has

an integral transmission and park switch. The motor
also contains an internal automatic resetting circuit
breaker to protect the motor from overloads.

The motor is secured near the center of the tubular

wiper linkage and pivot module bracket with three
screws. The wiper motor output shaft passes through
a hole in the module bracket, where a nut secures
the wiper motor crank arm to the motor output shaft.

Wiper speed is controlled by current flow to the

proper set of brushes. The wiper motor completes its
wipe cycle when the windshield wiper switch on the
end of the multi-function switch stalk is turned to
the Off position, and parks the blades in the lowest
portion of the wipe pattern.

The windshield wiper linkage, pivots, bushings,

mounting bracket, and motor are only serviced as a
complete unit. If any part of this unit is faulty or
damaged, the entire wiper module must be replaced.

REAR

The rear wiper motor is secured to a bracket that

is fastened to the liftgate inner panel with two
screws through two rubber grommet-type insulators,
below the rear window glass and behind the liftgate
trim panel. The motor output shaft passes through
the liftgate outer panel where a rubber grommet and
a nut seal and secure the unit to the liftgate outer
panel. A plastic cover snaps onto the motor output
shaft to conceal the mounting nut. The rear wiper
arm is secured directly to the motor output shaft
with another nut, which is also concealed by a plastic
cover that snaps onto the end of the wiper arm.

The rear wiper motor unit provides a single speed

intermittent-cycle operating mode, which is provided
by an electronic timer circuit that is integral to the
motor unit. The rear wiper motor cannot be repaired.
If faulty or damaged, the entire rear wiper motor
assembly must be replaced.

WIPER SWITCH AND WASHER SWITCH

FRONT

The windshield wiper and washer switches are

contained in the multi-function switch assembly (Fig.
1). The multi-function switch assembly is secured to
the left side of the steering column. A knob on the
end of the multi-function switch stalk is rotated to
select the desired wiper speed or intermittent wipe
delay, or depressed toward the steering column to
activate the washer system.

The multi-function switch contains circuitry for the

following functions:

• Turn signals

• Hazard warning

• Headlamp beam selection

• Headlamp optical horn

• Windshield wipers

• Windshield washers.
The information contained in this group addresses

only the switch functions for the windshield wiper
and washer systems. For information relative to the
other switch functions, refer to the proper group.
However,

the

multi-function

switch

cannot

be

repaired. If any function of the multi-function switch
is faulty, or if the switch is damaged, the entire
switch assembly must be replaced.

REAR

The single two-function rear wiper and washer

switch is integral to the rear window switch pod,
which includes the rear window defogger switch. The
rear window switch pod is installed in the instru-
ment panel lower bezel, which is located near the
center of the lower instrument panel, below the
heater and air conditioner controls. The rear wiper
and washer switch controls the rear wiper and
washer functions.

The rear window switch pod also contains the rear

window defogger logic and timer circuitry, an amber
defogger indicator lamp, the rear window defogger
relay, and two switch illumination lamps. The indica-
tor and illumination lamps in the switch pod use
incandescent bulbs, which can be serviced.

The sliding-type switch features a detent in the On

position for the rear wiper. Pushing in on the rear
wiper switch button activates the momentary rear
washer switch. The rear wiper and washer switch

Fig. 1 Multi-Function Switch

1 – WINDSHIELD WASHER BUTTON
2 – CONTROL STALK
3 – HAZARD WARNING BUTTON
4 – WINDSHIELD WIPER CONTROL
5 – MULTI-FUNCTION SWITCH

DN

WIPER AND WASHER SYSTEMS

8K - 3

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

t 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.

However,

the

micro-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.

8K - 4

WIPER AND WASHER SYSTEMS

DN

DESCRIPTION AND OPERATION (Continued)

WASHER PUMP

The washer pumps and motors are mounted on the

right end of the upper radiator shroud near the bot-
tom of the washer reservoir. A barbed nipple on the
pump housing passes through a rubber grommet seal
installed in a hole near the bottom of the reservoir.
The washer pump is retained by an interference fit
between the barbed pump nipple and the grommet
seal, which is a light press fit.

A permanently lubricated and sealed motor is cou-

pled to a rotor-type pump. Washer fluid is gravity-fed
from the reservoir to the pump. When the motor is
energized, the pump pressurizes the washer fluid
and forces it through the plumbing to the nozzles.

The washer pump and motor units cannot be

repaired. If faulty, the entire washer pump and
motor unit must be replaced.

WASHER FLUID LEVEL SENSOR

The standard washer fluid level sensor is mounted

on the right outboard end of the upper radiator
shroud near the front of the windshield washer res-
ervoir. A barbed nipple on the sensor is press-fit into
a rubber grommet seal installed in a hole in the side
of the reservoir.

When the fluid level in the reservoir falls below

the pivoting float on the sensor, the float changes
position and closes the internal switch contacts of the
sensor. Refer to Low Washer Fluid Warning Lamp in
the Diagnosis and Testing section of Group 8E -
Instrument Panel Systems for diagnosis of the low
washer fluid warning lamp and circuit, including the
sensor.

The washer fluid level sensor cannot be repaired. If

faulty or damaged, the sensor unit must be replaced.

WASHER NOZZLE AND PLUMBING

FRONT

Pressurized washer fluid is fed through a single

hose, attached to a barbed nipple on the washer
pump. The hose is routed from the washer reservoir
to the dash panel along the top of the right front
wheelhouse inner panel. At the dash panel, the hose
passes through a grommet inserted in a hole in the
cowl plenum panel to an in-line fitting located in the
cowl plenum area, beneath the cowl plenum cover/
grille panel.

A hose from the in-line fitting in the cowl plenum

is routed through clips molded into the underside of
the cowl plenum cover/grille panel to a wye fitting
near the passenger side washer nozzle. Hoses from
the wye fitting are routed to the two washer nozzles,
which are snap-fit into openings in the cowl plenum
cover/grille panel.

The wye fitting includes an integral check valve to

prevent the washer fluid from draining from the noz-
zles back to the reservoir or from leaking out of the
nozzles after washer operation is complete. The two
fluidic washer nozzles are not adjustable. The nozzles
and hose fittings cannot be repaired and, if faulty or
damaged, they must be replaced.

REAR

Pressurized washer fluid is fed through a single

hose, attached to a barbed nipple on the rear window
washer pump. The hose is routed from the washer
reservoir to the dash panel along the top of the right
front wheelhouse inner panel. At the dash panel, the
hose passes through a grommet in the dash panel
into the passenger compartment. Inside the passen-
ger compartment the hose is routed down the right
cowl side inner panel to the sill, then along the sill to
the right quarter inner panel. The hose is routed
along the quarter inner panel and up the right lift-
gate opening pillar to the liftgate opening header.

Located near the top of the supply hose routing,

beneath the right liftgate opening pillar trim, the
hose connects to a check valve. The check valve pre-
vents washer fluid drain-back or siphoning from
occurring. From the check valve, another single hose
is routed to the liftgate opening header panel. There
the hose passes through a grommet out of the liftgate
opening header and through another grommet into
the top of the liftgate inner panel. Within the lift-
gate, the hose is connected to a nipple that protrudes
from the fluidic washer nozzle, which is snap-fit into
a keyed hole in the top of the liftgate outer panel.

The

rear

window

washer

nozzle

cannot

be

adjusted. The nozzle, check valve, and hose fittings
cannot be repaired and, if faulty or damaged, they
must be replaced.

DIAGNOSIS AND TESTING

WIPER SYSTEM

FRONT

If the problem being diagnosed involves only the

pulse wipe or wipe-after-wash modes, see Washer
System in the Diagnosis and Testing section of this
group. For circuit descriptions and diagrams, refer to
8W-53 - Wipers in Group 8W - Wiring Diagrams.

DN

WIPER AND WASHER SYSTEMS

8K - 5

DESCRIPTION AND OPERATION (Continued)

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,

REFER

TO

GROUP

8M

-

PASSIVE

RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING

WHEEL,

STEERING

COLUMN,

OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

(1) Check the fuse in the junction block. If OK, go

to Step 2. If not OK, repair the shorted circuit or
component as required and replace the faulty fuse.

(2) Turn the ignition switch to the On position.

Check for battery voltage at the fuse in the junction
block. If OK, go to Step 3. If not OK, repair the open
circuit to the ignition switch as required.

(3) Turn the ignition switch to the Off position.

Disconnect and isolate the battery negative cable.
Unplug the multi-function switch wire harness con-
nector. Connect the battery negative cable. Turn the
ignition switch to the On position. Check for battery
voltage at the fused ignition switch output (run/ac-
cessory) circuit cavity of the multi-function switch
wire harness connector. If OK, go to Step 4. If not
OK, repair the open circuit to the fuse in the junction
block as required.

(4) If the problem being diagnosed involves only

the intermittent wipe feature, go to Step 5. If the
problem being diagnosed involves all wiper modes, or
only the Low and/or High speed modes, go to Step 7.

(5) Turn the ignition switch to the Off position.

Disconnect and isolate the battery negative cable.
Move the Central Timer Module (CTM) from its
mounting position far enough so that the CTM wire
harness connectors can be accessed. Refer to Central
Timer Module in the Removal and Installation sec-
tion of Group 8E - Instrument Panel Systems for the
procedures. Unplug the 14-way CTM wire harness
connector. Check for continuity between the wiper
switch mode sense circuit cavities of the multi-func-
tion switch wire harness connector and the CTM
14-way wire harness connector. There should be con-
tinuity. If OK, go to Step 6. If not OK, repair the
open circuit as required.

(6) Check for continuity between the windshield

wiper switch signal circuit cavities of the multi-func-
tion switch wire harness connector and the CTM
14-way wire harness connector. There should be con-
tinuity. If OK, see Intermittent Wipe Relay in the
Diagnosis and Testing section of this group. If not
OK, repair the open circuit as required.

(7) Check for continuity between the two wiper

switch low speed output circuit cavities of the multi-
function switch wire harness connector. There should
be continuity. If OK, go to Step 8. If not OK, repair
the open circuit as required.

(8) Test the wiper switch. See Wiper Switch and

Washer Switch in the Diagnosis and Testing section
of this group for the procedures. If the switch tests
OK, plug in the multi-function switch wire harness
connector and go to Step 9. If not OK, replace the
faulty switch and test the wiper system operation. If
still not OK, go to Step 9.

(9) Turn the ignition switch to the Off position.

Disconnect and isolate the battery negative cable.
Move the wiper module far enough to access the
wiper motor wire harness connector. Measure the
resistance between the ground circuit cavity of the
wiper motor wire harness connector and a good
ground. The meter should read zero ohms. If OK, go
to Step 10. If not OK, repair the circuit to ground as
required.

(10) Connect the battery negative cable. Turn the

ignition switch to the On position. Place the multi-
function switch in the positions indicated in the tests
below, and check for battery voltage at the wiper
motor wire harness connector.

(a) Check for battery voltage at the fused igni-

tion switch output (run/accessory) circuit cavity of
the wiper motor wire harness connector with the
wiper switch in any position. If OK, go to Step b. If
not OK, repair the open circuit as required.

(b) Check for battery voltage at the wiper switch

low speed output circuit cavity of the wiper motor
wire harness connector with the wiper switch in
the Low position. If OK, go to Step c. If not OK,
repair the open circuit as required.

(c) Check for battery voltage at the wiper switch

high speed output circuit cavity of the wiper motor
wire harness connector with the wiper switch in
the High position. If OK, go to Step d. If not OK,
repair the open circuit as required.

(d) Check for battery voltage at the wiper park

switch sense circuit cavity of the wiper motor wire
harness connector with the wiper switch in the
Low or High position, then move the switch to the
Off position. The meter should switch between bat-
tery voltage and zero volts while the wipers are
cycling. The meter should read battery voltage
when the switch is moved to the Off position until
the wipers park, and then read a steady zero volts.
If not OK, replace the faulty wiper motor.

REAR

If the problem being diagnosed involves only the

rear wipe-after-wash mode, check the rear washer
motor control circuit between the rear washer motor
wire harness connector and the rear wiper motor
wire harness connector for shorts or opens. If the cir-
cuit checks OK, replace the faulty rear wiper motor.
For circuit descriptions and diagrams, refer to 8W-53
- Wipers in Group 8W - Wiring Diagrams.

8K - 6

WIPER AND WASHER SYSTEMS

DN

DIAGNOSIS AND TESTING (Continued)