Dodge Dakota (R1). Manual - part 359

front of the windshield washer reservoir on the right
outboard end of the upper radiator shroud.

• Washer Nozzles - The dual fluidic washer noz-

zles are secured with integral snap features to dedi-
cated openings in the cowl plenum cover/grille panel
located near the base of the windshield. The washer
plumbing fittings for the washer nozzles are con-
cealed beneath the cowl plenum cover/grille panel.

• Washer Pump/Motor - The washer pump/mo-

tor unit is located in a dedicated hole near the bot-
tom of the windshield washer reservoir on the right
end of the upper radiator shroud.

• Washer Reservoir - The washer reservoir is

integral to and located on the right end of the upper
radiator

shroud.

The

washer

reservoir

filler

accessed from the right front corner of the engine
compartment.

• Wiper Arms - The two wiper arms are secured

to the two wiper pivots, which extend through the
cowl plenum cover/grille panel located near the base
of the windshield.

• Wiper Blades - The two wiper blades are

secured to the two wiper arms, and are parked on
the glass near the bottom of the windshield when the
wiper system is not in operation.

• Wiper Module - The wiper pivots are the only

visible components of the wiper module. The remain-
der of the module is concealed within the cowl ple-
num beneath the cowl plenum cover/grille panel. The
wiper module includes the module bracket, the single
wiper motor, the wiper linkage, and the two wiper
pivots.

• Wiper Relay - The wiper relay is located in the

Power Distribution Center (PDC) in the engine com-
partment near the battery.

Features of the wiper and washer system include

the following:

• Continuous Wipe Modes - The two-speed

wiper motor and the internal circuitry of the multi-
function switch work in concert to provide two con-
tinuous wipe cycles, low speed or high speed.

• Intermittent Wipe Mode - The internal cir-

cuitry of the multi-function switch, the CTM, and the
wiper relay work in concert to provide an intermit-
tent wipe mode with multiple delay interval selec-
tions. The CTM also automatically adjusts each
manually selected delay interval to compensate for
vehicle speed.

• Washer Mode - When the washer system is

activated with the multi-function switch while the
wiper system is operating, washer fluid will be dis-
pensed onto the windshield glass through the washer
nozzles for as long as the washer pump/motor is
energized.

• Wipe-After-Wash Mode - The internal circuitry

of the CTM provides a wipe-after-wash feature

which, if the wipers are turned Off, will operate the
washer pump/motor and the wipers for as long as the
washer system is activated, then provide several
additional wipe cycles after the washer system is
deactivated before parking the wiper blades near the
base of the windshield.

Hard wired circuitry connects the wiper and

washer system components to the electrical system of
the vehicle. These hard wired circuits are integral to
several wire harnesses, which are routed throughout
the vehicle and retained by many different methods.
These circuits may be connected to each other, to the
vehicle electrical system and to the wiper and washer
system components through the use of a combination
of soldered splices, splice block connectors, and many
different types of wire harness terminal connectors
and insulators. Refer to the appropriate wiring infor-
mation. The wiring information includes wiring dia-
grams, proper wire and connector repair procedures,
further details on wire harness routing and reten-
tion, as well as pin-out and location views for the
various wire harness connectors, splices and grounds.

OPERATION

The wiper and washer system is intended to pro-

vide the vehicle operator with a convenient, safe, and
reliable means of maintaining visibility through the
windshield glass. The various components of this sys-
tem are designed to convert electrical energy pro-
duced by the vehicle electrical system into the
mechanical action of the wiper blades to wipe the
outside surface of the glass, as well as into the
hydraulic action of the washer system to apply
washer fluid stored in an on-board reservoir to the
area of the glass to be wiped. When combined, these
components provide the means to effectively main-
tain clear visibility for the vehicle operator by remov-
ing excess accumulations of rain, snow, bugs, mud, or
other minor debris that might be encountered while
driving the vehicle under numerous types of inclem-
ent operating conditions from the outside windshield
glass surface. The vehicle operator initiates all wiper
and washer system functions with the multi-function
switch control stalk that extends from the left side of
the steering column, just below the steering wheel.
Rotating the knob on the end of the multi-function
switch control stalk selects the desired wiper system
operating mode. The wiper system allows the vehicle
operator to select from two continuous wiper speeds,
Hi or Lo, or one of several intermittent wipe Delay
mode intervals. Pushing the knob on the end of the
control stalk towards the steering column activates
the washer pump/motor, which dispenses washer
fluid onto the windshield glass through the washer
nozzles.

8R - 2

WIPERS/WASHERS

WIPERS/WASHERS (Continued)

When the ignition switch is in the Accessory or On

positions, battery current from a fuse in the Junction
Block (JB) is provided through a fused ignition
switch output (run-acc) circuit to the wiper motor
park switch, the wiper relay, and the multi-function
switch. The internal circuitry of the multi-function
switch provides a direct hard wired battery current
output to the low speed or high speed brushes of the
wiper motor when the Lo or Hi switch setting is
selected, which causes the wipers to cycle at the
selected speed. The intermittent wipe, and wipe-af-
ter-wash features of the wiper and washer system
are provided by the electronic intermittent wipe logic
circuit within the Central Timer Module (CTM). In
order to provide the intermittent wipe feature, the
CTM monitors the wiper switch state and the wiper
motor park switch state. In order to provide the
wipe-after-wash feature, the CTM monitors both the
washer switch state and the wiper motor park switch
state. When a Delay position is selected with the
multi-function switch control knob, the CTM logic cir-
cuit responds by calculating the correct delay inter-
val. The CTM then energizes the wiper relay by
pulling the relay control coil to ground. The ener-
gized wiper relay directs battery current through the
normally open contact of the relay back through the
internal Delay position circuitry of the multi-function
switch to the low speed brush of the wiper motor.
The

CTM

monitors

the

wiper

motor

operation

through the wiper park switch sense circuit, which
allows the CTM to determine the proper timing to
begin the next wiper blade sweep. The normal delay
intervals are driver adjustable from about one-half
second to about eighteen seconds.

The CTM also provides a speed sensitive intermit-

tent wipe feature. By monitoring vehicle speed mes-
sages received from the Powertrain Control Module
(PCM)

over

the

Programmable

Communications

Interface (PCI) data bus network, the CTM is able to
adjust the delay intervals to compensate for vehicle
speed. Above about sixteen kilometers-per-hour (ten
miles-per-hour) the delay is driver adjustable from
about one-half second to about eighteen seconds.
Below about sixteen kilometers-per-hour (ten miles-
per-hour) the delay times are doubled by the CTM,
from about one second to about thirty-six seconds.

When the Off position of the multi-function switch

wiper control knob is selected, one of two events is
possible. The event that will occur depends upon the
position of the wiper blades on the windshield at the
moment that the Off position is selected. If the wiper
blades are in the down position on the windshield
when the Off position is selected, the park switch
that is integral to the wiper motor is closed to ground
and the wiper motor ceases to operate. If the wiper
blades are not in the down position on the windshield

at the moment the Off position is selected, the park
switch is closed to battery current through a fused
ignition switch output (run-acc) circuit. The park
switch sense circuit directs this battery current to
the low speed brush of the wiper motor through the
normally closed contact of the wiper relay and the
internal Off position circuitry of the multi-function
switch. This causes the wiper motor to continue run-
ning until the wiper blades are in the down position
on the windshield and the park switch is again
closed to ground.

When the Wash position of the multi-function

switch is selected, the Wash position circuitry within
the switch directs a battery current signal input to
the CTM. The CTM monitors the washer switch state
through this input to control a battery current output
to the washer pump/motor unit. When the washer
switch is closed with the wiper system turned Off,
the CTM operates the wiper motor through the wiper
relay in the same manner as it does to provide the
Delay mode operation. After the state of the washer
switch changes to open, the CTM monitors the wiper
motor through the wiper park switch sense circuit,
which allows the CTM to monitor the number of
wiper blade sweeps. After the appropriate number of
wiper sweeps, the CTM de-energizes the wiper relay
and the wipers return to their park position.

Proper testing of the CTM, the PCM, or the PCI

data bus vehicle speed messages requires a DRBIII

scan tool. Refer to the appropriate diagnostic infor-
mation. Refer to the owner’s manual in the vehicle
glove box for more information on the features and
operation of the wiper and washer system.

DIAGNOSIS AND TESTING - WIPER &
WASHER SYSTEM

WIPER SYSTEM

The diagnosis found here addresses an electrically

inoperative wiper system. If the wiper motor oper-
ates, but the wipers do not move on the windshield,
replace the faulty wiper module. If the wipers oper-
ate, but chatter, lift, or do not clear the glass, clean
and

inspect

the

wiper

system

components

required.

(Refer

ELECTRICAL/WIPERS/

WASHERS - INSPECTION) and (Refer to 8 - ELEC-
TRICAL/WIPERS/WASHERS - CLEANING). Refer to
the appropriate wiring information. The wiring infor-
mation includes wiring diagrams, proper wire and
connector repair procedures, details of wire harness
routing and retention, connector pin-out information
and location views for the various wire harness con-
nectors, splices and grounds.

The following tests will help to diagnose the hard

wired components and circuits of the wiper system.
However, these tests may not prove conclusive in the

WIPERS/WASHERS

8R - 3

WIPERS/WASHERS (Continued)

diagnosis of the Central Timer Module (CTM). In
order to obtain conclusive testing of the CTM, the
Programmable Communications Interface (PCI) data
bus network and all of the electronic modules that
provide inputs to or receive outputs from the wiper
system components must be checked. The most reli-
able, efficient, and accurate means to diagnose the
CTM requires the use of a DRBIII

t scan tool. Refer

the

appropriate

diagnostic

information.

The

DRBIII

t scan tool can provide confirmation that the

PCI data bus is functional, that all of the electronic
modules are sending and receiving the proper mes-
sages on the PCI data bus, and that the wiper relay
is being sent the proper hard wired outputs by the
CTM for it to perform its wiper system functions.

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.

(1) Check the fused ignition switch output (run-

acc) fuse (Fuse 5 - 20 ampere) in the Junction Block
(JB). 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 fused ignition switch
output (run-acc) fuse (Fuse 5 - 20 ampere) in the JB.
If OK, go to Step 3. If not OK, repair the open fused
ignition switch output (run-acc) circuit between the
JB and the ignition switch as required.

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

Disconnect and isolate the battery negative cable.
Disconnect the instrument panel wire harness con-
nector for the multi-function switch from the switch
connector receptacle. Reconnect the battery negative
cable. Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output (run-acc) circuit cavity of the instrument
panel wire harness connector for the multi-function
switch. If OK, go to Step 4. If not OK, repair the
open fused ignition switch output (run-acc) circuit
between the multi-function switch and the JB 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.
Disconnect the instrument panel wire harness con-
nector (Connector C1) for the CTM from the CTM
connector receptacle. Check for continuity between
the intermittent front wiper mode sense circuit cavi-
ties of the instrument panel wire harness connector
for the multi-function switch and the instrument
panel wire harness connector (Connector C1) for the
CTM. There should be continuity. If OK, go to Step 6.
If not OK, repair the open intermittent front wiper
mode sense circuit between the multi-function switch
and the CTM as required.

(6) Check for continuity between the intermittent

front wiper switch signal circuit cavities of the
instrument panel wire harness connector for the
multi-function switch and the instrument panel wire
harness connector (Connector C1) for the CTM. There
should be continuity. If OK, proceed to the diagnosis
for the wiper relay. (Refer to 8 - ELECTRICAL/WIP-
ERS/WASHERS/WIPER RELAY - DIAGNOSIS AND
TESTING). If not OK, repair the open intermittent
front wiper switch signal circuit between the multi-
function switch and the CTM as required.

(7) Check for continuity between the two front

wiper low speed circuit cavities of the instrument
panel wire harness connector for the multi-function
switch. There should be continuity. If OK, go to Step
8. If not OK, repair the open front wiper low speed
circuit between the two cavities of the instrument
panel wire harness connector for the multi-function
switch as required.

(8) Test

the

multi-function

switch

continuity.

(Refer to 8 - ELECTRICAL/LAMPS/LIGHTING -
EXTERIOR/MULTI-FUNCTION SWITCH - DIAG-
NOSIS AND TESTING). If the multi-function switch
tests OK, reconnect the instrument panel wire har-
ness connector for the multi-function switch to the
switch connector receptacle and go to Step 9. If not
OK, replace the faulty multi-function switch and test
the wiper system operation again. If still not OK, go
to Step 9.

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

Disconnect and isolate the battery negative cable.
Measure the resistance between the headlamp and
dash wire harness ground wire for the wiper motor
and a good ground. The meter should read zero
ohms. If OK, go to Step 10. If not OK, repair the
open ground circuit to ground (G113) as required.

(10) Disconnect the headlamp and dash wire har-

ness connector for the wiper module from the wiper
motor pigtail wire connector. Reconnect the battery
negative cable. Turn the ignition switch to the On
position. Place the multi-function switch in the posi-

8R - 4

WIPERS/WASHERS

WIPERS/WASHERS (Continued)

tions indicated in the tests below, and check for bat-
tery

voltage

the

appropriate

cavity

the

headlamp and dash wire harness connector for the
wiper motor.

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

tion switch output (run-acc) circuit cavity of the
headlamp and dash wire harness connector for the
wiper module with the multi-function switch in
any position. If OK, go to Step b. If not OK, repair
the open fused ignition switch output (run-acc) cir-
cuit between the wiper module and the JB as
required.

(b) Check for battery voltage at the front wiper

low speed circuit cavity of the headlamp and dash
wire harness connector for the wiper module with
the multi-function switch in the Lo position. If OK,
go to Step c. If not OK, repair the open front wiper
low speed circuit between the wiper module and
the multi-function switch as required.

high speed circuit cavity of the headlamp and dash
wire harness connector for the wiper module with
the multi-function switch in the Hi position. If OK,
go to Step d. If not OK, repair the open front wiper
high speed circuit between the wiper module and
the multi-function switch as required.

(d) Check for battery voltage at the front wiper

park switch sense circuit cavity of the headlamp
and dash wire harness connector for the wiper
module with the multi-function switch in the Lo or
Hi position, then move the switch to the Off posi-
tion. The meter should switch between battery
voltage and zero volts while the wipers are cycling.
The meter should read battery voltage when the
switch is first moved to the Off position until the
wipers park, and then read a steady zero volts. If
not OK, replace the faulty wiper module.

WASHER SYSTEM

The diagnosis found here addresses an electrically

inoperative washer system. However, these tests may
not prove conclusive in the diagnosis of the Central
Timer Module (CTM). In order to obtain conclusive
testing of the CTM, the Programmable Communica-
tions Interface (PCI) data bus network and all of the
electronic modules that provide inputs to or receive
outputs from the washer system components must be
checked. The most reliable, efficient, and accurate
means to diagnose the CTM requires the use of a
DRBIII

t scan tool. Refer to the appropriate diagnos-

tic information. If the washer pump/motor operates,
but no washer fluid is emitted from the washer noz-
zles, be certain to check the fluid level in the reser-
voir. Also inspect the washer system components as
required.

(Refer

ELECTRICAL/WIPERS/

WASHERS - INSPECTION). Refer to the appropriate

wiring information. The wiring information includes
wiring diagrams, proper wire and connector repair
procedures, details of wire harness routing and
retention, connector pin-out information and location
views for the various wire harness connectors, splices
and grounds.

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

Turn the multi-function switch wiper control knob to
the Lo or Hi speed position. Check whether the wip-
ers operate. If OK, go to Step 2. If not OK, repair the
wiper system as required before proceeding with the
following tests. Refer to WIPER SYSTEM .

(2) Turn the multi-function switch wiper control

knob to the Off position. Depress the control knob to
the Wash position. The washer pump should operate
and the wipers should operate for as long as the con-
trol knob is depressed. The wipers should continue to
operate for about three sweep cycles after the control
knob is released before they park. If the wipers are
OK, but the washers are not, go to Step 3. If the
washers are OK, but the wipers are not, go to Step 5.

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

Disconnect and isolate the battery negative cable.
Disconnect the headlamp and dash wire harness con-
nector for the washer pump/motor from the motor
connector receptacle. Measure the resistance between
the ground circuit cavity of the headlamp and dash
wire harness connector for the washer pump/motor
and a good ground. The meter should read zero
ohms. If OK, go to Step 4. If not OK, repair the open
ground circuit to ground (G112) as required.

(4) Reconnect the battery negative cable. Turn the

ignition switch to the On position. With the control
knob of the multi-function switch depressed to the
Wash position, check for battery voltage at the front
washer pump/motor control circuit cavity of the head-
lamp and dash wire harness connector for the washer
pump/motor. If OK, replace the faulty washer pump/
motor. If not OK, repair the open front washer pump/
motor control circuit between the washer pump/
motor and the CTM as required.

WIPERS/WASHERS

8R - 5

WIPERS/WASHERS (Continued)

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