This information is out of my manual, I hope it helps you, Ian
WIPERS/WASHERS
DESCRIPTION
FRONT WIPER/WASHER SYSTEM
The windshield wipers can be operated with the
windshield wiper switch when the ignition switch is
in the RUN or ACCESSORY positions. The windshield
wiper system is protected by a 30 amp fuse (9)
located in the Power Distribution Center (PDC) part
of the Integrated Power Module (IPM) in the engine
compartment. The wiper/washer switch is integral to
the multi-function switch. It is a resistive MUX
switch that sends inputs to the BCM to operate the
wiper/washer system.
REAR WIPER/WASHER SYSTEM
The rear windshield wiper and washers can be
operated when the ignition switch is in the RUN or
ACCESSORY positions.
OPERATION
FRONT WIPER/WASHER SYSTEM
The windshield washer circuit is protected by a 9
amp PTC located in the Junction Block. The wiper
motor has permanent magnetic fields. The speeds are
determined by current flow to the appropriate set of
brushes inside the motor. The current flow is controlled
by the multi-function switch stalk mounted
wiper switch, high speed/low speed relays located in
the Power Distribution Center (PDC) part of the
Integrated Power Module (IPM) in the engine compartment.
The speed sensitive intermittent wiper is
controlled by the Body Control Module (BCM). The
intermittent mode, with the vehicle traveling greater
than 10.4 mph, has a range of 0.5 to 18 seconds.
With the vehicle traveling less than 10.4 mph, and
the time delay is not adjusted, time delay doubles to
a range of 1 to 36 seconds. The wiper arms will park
at the base of the windshield just above the cowl
cover after the wiper switch is turned OFF.
WIPERS/WASHERS (Continued)
The windshield wiper motor and linkage is located
in an integral wiper unit at the rear of the engine
compartment. The wiper unit must be removed to
gain access to the wiper motor.
REAR WIPER/WASHER SYSTEM
When continuous rear wiper operation is required,
the Body Control Module (BCM) will provide ignition
ON voltage to the rear wiper motor. When the wiper
switch is turned OFF, the BCM provides circuit
ground to operate the motor until the wipe cycle is
complete and the wiper arm returns to the base of
the rear window.
When intermittent rear wiper mode is selected, the
wiper motor will cycle every 7 seconds. The intermittent
delay time is also adjusted based upon vehicle
speed. With the vehicle traveling greater at 50 mph,
the cycle changes to every 5 seconds. DIAGNOSIS
AND TESTING
DIAGNOSIS AND TESTING - FRONT WIPER
SYSTEM
The windshield wiper system operates in several
modes:
† Low and high speed normal wipe
† Speed sensitive intermittent wipe
† Wipe after wash
† Pulse wipe
† Park (switch OFF)
The windshield wiper circuits are continuously
monitored and controlled by the Body Control Module
(BCM). If a problem occurs in the electronic components,
wiring, switch (except integral motor park
switch) and wiper motor a Diagnostic Trouble Code
(DTC) will be stored in the BCM memory. DTC’s can
be retrieved using a DRB IIIt scan tool. Refer to the
proper Body Diagnostic Procedures manual for DTC
descriptions and retrieval information.
The windshield wiper park switch and circuit is
monitored by the BCM. The park switch and circuit
can be tested using the Wiper System Diagnosis
table.
DIAGNOSIS AND TESTING - REAR WIPER
SYSTEM
The rear window wiper system operates in several
modes:
† Continuous wipe
† Intermittent wipe
† Wash
† Wipe after wash
The windshield wiper circuits are continuously
monitored and controlled by the Body Control Module
(BCM). If a problem occurs in the electronic components,
wiring, switch (except integral motor park
switch) and wiper motor a Diagnostic Trouble Code
(DTC) will be stored in the BCM memory. The
DTC(s) can be retrieved using a DRB IIIt scan tool.
To test the front wiper/washer portion of the multifunction
switch:
(1) Remove the multi-function switch (Refer to 8 -
ELECTRICAL/LAMPS/LIGHTING - EXTERIOR/
MULTI-FUNCTION SWITCH - REMOVAL).
(2) Using an ohmmeter check continuity reading
between switch pins. See (Fig. 1) and the table.
WIPER/WASHER SWITCH CONTINUITY
SWITCH POSITION RESISTANCE VALUE
BETWEEN
OFF 6 AND 7 = OPEN CIRCUIT
DELAY POSITION
1ST 6 AND 7 = 8 K V 6 80 V
2ND 6 AND 7 = 6 K V 6 60 V
3RD 6 AND 7 = 4.5 K V 6 45 V
4TH 6 AND 7 = 3.5 K V 6 35 V
5TH 6 AND 7 = 2.5 K V 6 25 V
6TH 6 AND 7 = 1.5 K V 6 15 V
LOW 6 AND 7 = 1 K V 6 10 V
HIGH 6 AND 7 = 1 K V 6 10 V
WASH 6 AND 11 = CONTINUITY
DIAGNOSIS AND TESTING - FAILED PARK
SWITCH
If the wiper park switch has failed the windshield
wipers will operate as follows:
†SWITCH OFF - Wipers stop in current location
regardless of the park signal.
†INTERMITTENT MODE - Wipers operate at
low speed for one or more extra wipes or continuously.
Fig. 1 WIPER/WASHER SWITCH PIN CALL OUT
8R - 2 WIPERS/WASHERS RS
WIPERS/WASHERS (Continued)
†LOW SPEED - Wipers operate at low speed.
†HIGH SPEED - Wipers operate at high speed.
†PULSE WIPE - Wipers will not operate.
†WIPE AFTER WASH - Wipers operate at low
speed in any mode setting. Wipers operate only while
wash button is depressed with switch in OFF mode,
wipers stop in mid-cycle when button is released.
The windshield wiper park switch and circuit is
monitored by the BCM. The park switch and circuit
can be tested using the table.
WIPER SYSTEM DIAGNOSIS
CONDITION POSSIBLE CAUSES CORRECTION
WIPER BLADES DO NOT
PARK PROPERLY
1. WIPER ARMS IMPROPERLY
PARKED.
2. WIPER ARMS ARE LOOSE ON
PIVOT SHAFT.
3. MOTOR CRANK LOOSE AT
OUTPUT SHAFT.
1. REMOVE WIPER ARMS AND REPARK.
REFER TO WIPER ARM REMOVAL AND
INSTALLATION.
2. REMOVE WIPER ARM AND REPARK.
REFER TO WIPER ARM REMOVAL AND
INSTALLATION.
3. REMOVE WIPER ARM, RUN WIPER
MOTOR TO PARK POSITION AND
REMOVE THE MODULE. WITHOUT
ROTATING THE MOTOR OUTPUT SHAFT,
REMOVE THE CRANK AND CLEAN ANY
FOREIGN MATTER FROM THE MOTOR
SHAFT. INSTALL THE MOTOR CRANK IN
ITS ORIGINAL POSITION
__________________________________________
MOTOR STOPS IN ANY
POSITION WHEN THE
SWITCH IS TURNED OFF
1. OPEN PARK CIRCUIT. 1. CHECK PARK SWITCH BY
DISCONNECTING THE WIRE
CONNECTOR AND APPLY BATTERY
VOLTAGE TO PIN 4. PLACE A JUMPER
WIRE FROM PIN 2 TO PIN 3 AND THEN
TO AN EXTERNAL GROUND. REPLACE
MOTOR IF IT DOES NOT PARK.
MOTOR WILL NOT STOP
WHEN THE SWITCH IS
TURNED OFF
1. FAULTY SWITCH.
2. LACK OF DYNAMIC BRAKE ON
WET GLASS.
1. CHECK SWITCH IN LOW, HIGH AND
INTERMITTENT POSITION.
2. ENSURE PARK SWITCH HAS CLEAN
GROUND.
WIPER BLADES SLAP
AGAINST COWL SCREEN
OR WINDOW MOLDINGS.
1. WIPER ARMS ARE PARKED
INCORRECTLY.
1. PARK WIPER ARMS. REFER TO
WIPER ARM ADJUSTMENT.
BLADES CHATTER 1. FOREIGN SUBSTANCE SUCH
AS POLISH ON GLASS OR
BLADES.
2. ARMS TWISTED, BLADE AT
WRONG ANGLE ON GLASS.
3. BLADE STRUCTURE BENT.
4. BLADE ELEMENT HAS
PERMANENT SET.
1. CLEAN GLASS AND BLADE ELEMENT
WITH NON-ABRASIVE CLEANER.
2. REPLACE ARM.
3. REPLACE BLADE.
4. REPLACE BLADE ELEMENT.
WIPER KNOCK AT
REVERSAL
1. LINKAGE BUSHINGS WORN.
2. ARMATURE ENDPLAY IN
MOTOR.
1. REPLACE WORN LINK. REFER TO
WIPER LINKAGE REMOVAL AND
INSTALLATION.
2. REPLACE WIPER MOTOR. REFER TO
WIPER MOTOR REMOVAL AND
INSTALLATION.
________________________________________________
WIPER MOTOR WILL NOT
RUN
1. BLOWN FUSE.
2. NEW FUSE BLOWS.
3. NEW FUSE BLOWS.
4. NO VOLTAGE AT MOTOR.
5. POOR GROUND.
1. REPLACE FUSE, AND RUN SYSTEM.
2. CHECK FOR SHORT IN WIRING OR
SWITCH.
3. REPLACE FUSE, REMOVE MOTOR
CONNECTOR, TURN SWITCH ON, FUSE
DOES NOT BLOW, REPLACE MOTOR.
4. CHECK SWITCH AND WIRING
HARNESS. REFER TO WIRING
DIAGRAMS.
5. REPAIR GROUND WIRE CONNECTION
AS NECESSARY.
My Car is a Chrysler Grand Voyager 2.5CRD diesel so I hope this info is helpful, I can`t download the circuit diagram but I`ll try to explain what does what. Fuse 4 is rated at 30A and feeds the Intelligent Power Module which in turn powers the front wipers. There are two relays in the module, one is the power on relay and the other is the high/low setting. You`ve got four connections on the front wiper motor itself, Earth, Park Switch, High and low speed. I may be wrong but it looks on the circuit that there may be a thermal fuse which earths the motor but is built inside the motor casing. If this is O/C, this may be your problem, It provides an earth connection from the motor to the park switch and main earth. If pin 4 on the motor is permanently O/C, Then it may well be this thermal fuse. Sorry I can`t be of any further help. Ian
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CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
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