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WINDSHIELD WIPER AND WASHER SYSTEMS
8K - 1
WINDSHIELD WIPER AND WASHER SYSTEMS
CONTENTS
page
page
FRONT WIPERS/WASHERS ................
REAR WINDOW WIPER/WASHER ...........
FRONT WIPERS/WASHERS
INDEX
page
page
Diagnosing Windshield Wipers ...............
General Information .......................
Intermittent Wiper Function Testing Procedures ....
Multifunction (Intermittent Wiper) Switch Testing
Procedures ............................
Washer Pump Replacement ..................
Wiper Motor Replacement ...................
Wiper Switch Replacement ...................
GENERAL INFORMATION
An intermittent windshield wiper system and elec-
tric washers are standard equipment. The intermit-
tent wiper system provides a pause between wipe
cycles for use during conditions of very light precipi-
tation.
The windshield wipers can be operated with the
windshield wiper switch only when the ignition
switch is in the ACCESSORY or RUN position. A fuse
located in the fuse block protects the circuitry of the
wiper system and the vehicle.
The wiper motor has permanent magnet fields. The
speeds are determined by current flow to the appro-
priate set of brushes.
The intermittent wipe system in addition to low and
high speed, has a delay mode. The delay mode has a
range of 2 to 20 seconds. This is performed by a
variable resistor in the wiper switch and is controlled
electrically by the intermittent wiper control unit.
The wiper system completes the wipe cycle when
the switch is turned OFF. The blades park in the
lowest portion of the wipe pattern.
If the washer knob is depressed while in the OFF
position, the wiper control will operate for approxi-
mately 3 wipes and automatically turn OFF.
The switch supplies battery feed to the intermittent
wiper module, which then supplies the motor. In the
delay position, the module is connected with the vari-
able resistor in the wiper switch. The value of the
resistance is used by the module to charge a capaci-
tor, which triggers the amount of delay between
wipes.
The wiper motor has an arrangement of brushes
providing the two wiper speeds. When the wipers are
turned off, the park switch maintains current to the
motor until the wipers reach the park position on the
windshield.
The park arm in the motor assembly is connected to
the park switch and is driven by the motor. When the
wiper/washer switch is turned to OFF, current flows
through the contact and the module to the motor
until the wipers reach the park position.
CAUTION: The wiper arms and blades must not be
moved manually from side to side or damage may
result.
WASHERS
With the washer switch in ON, current flows
through the washer pump to ground. The front
washer pump runs as long as the driver holds the
switch in ON. The wiper module runs the wiper mo-
tor on LO. Turning the switch to OFF stops the
wipers.
If the washer knob is depressed while in the OFF
position, the wiper control will operate for approxi-
mately 3 wipes and automatically turn OFF.
WIPERS
The windshield wiper circuit contains three compo-
nents; wiper/washer switch, motor, and front washer
pump, module and delay resistance in the wiper
switch. The circuit receives battery feed from, and is
protected by a 10 amp circuit breaker.
 8K - 2 WINDSHIELD WIPER AND WASHER SYSTEMS
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WINDSHIELD WIPER AND WASHER SYSTEM
(11) Measure voltage at harness connector terminal
F and move wiper switch to OFF. Meter should read
battery voltage until wipers park and then zero volts.
If not, replace switch.
(12) Disconnect switch side of connector of inter-
mittent wiper module.
(13) Measure resistance across terminals A and D
while rotating switch from minimum delay to maxi-
mum delay. Meter should read 0-500K ohms. If not,
test switch.
(14) Measure resistance across terminals A and G
while rotating switch from minimum delay to maxi-
mum delay. Meter should read 0-500K ohms. If OK,
replace wiper module. If not, test switch.
(15) Measure resistance at terminal 4. Meter
should read zero ohms. If not, repair open to ground.
(16) To test the wiper motor turn the ignition
switch to ACCY. Position the wiper and probe the
motor connector as indicated Figure 1.
DIAGNOSING WINDSHIELD WIPERS
(1) Remove circuit breaker.
(2) Measure voltage battery side of the circuit
breaker. Meter should read battery voltage. If not,
repair open to splice.
(3) Measure resistance across circuit breaker termi-
nals. Meter should read zero ohms. If not, replace
circuit breaker.
(4) Disconnect harness side Intermittent Wiper
Module connector.
(5) Measure the resistance from harness side con-
nector terminal G to ground. Meter should read zero
ohms. If not, repair open to ground.
(6) Turn ignition switch to ACCY.
(7)
Turn wiper switch to LO or HI.
Fig. 1 Wiper Motor Connector
(17) Measure voltage at terminal 1,-wiper switch in any
position. Meter should read battery voltage. If OK, replace
motor. If not, repair open from fuse panel.
(18) Measure voltage at terminal 5,-wiper switch in
LO. Meter should read battery voltage. If OK, replace
motor. If not, repair open from wiper switch.
(19) Measure voltage at terminal 6,-wiper switch in
HI. Meter should read battery voltage. If OK, replace
motor. If not, repair open from wiper switch.
(20) Measure voltage at terminal 2-wiper switch to
OFF with voltmeter connected. Meter should read
battery voltage until wipers park and then zero volts.
If OK, replace motor. If not, repair open from wiper
switch.
CAUTION: DO NOT move the switch to intermittent.
If the switch is moved to the intermittent position
during the next step the rheostat will be damaged.
(8) Remove intermittent wiper module and plug
connectors together from the module. The Wipers
should operate in LO and HI speed modes and Mist
(washer) should work. If wipers and Mist now oper-
ate, replace intermittent wiper module. If not, go to
step 10.
(9) Measure voltage at harness connector terminal
E with wiper switch in LO and mist/intermittent.
Meter should read battery voltage. If not, test switch.
(10) Measure voltage at harness connector terminal
C with wiper switch in HI. Meter should read battery
voltage. If not, test switch.
INTERMITTENT WIPER FUNCTION TESTING PRO-
CEDURES
The multifunction switch contains circuitry for:
²
turn signal
²
hazard warning
²
headlamp beam select
²
headlamp optical horn
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WINDSHIELD WIPER AND WASHER SYSTEMS
8K - 3
²
windshield wiper
²
pulse wipe
and windshield washer switching.
This integrated switch assembly is mounted to the
left-hand side of the steering column. Should any
function of the switch fail, the entire switch assembly
must be replaced.
Using an ohmmeter, test for continuity between the
terminals of the switch as shown in Intermittent
Wipe Switch Continuity Chart.
To test the switch:
(1) Disconnect negative cable from the battery.
(2) Remove tilt lever (tilt column only).
(3) Remove both upper and lower steering column
covers. Requires removal of 3 screws (Torx T-20).
(4) Remove 4 screws holding steering column trim
panel (Fig. 2).
Fig. 3 Multifunction Switch Connector
Fig. 4 Steering Column Connectors
Fig. 2 Steering Column Trim And Knee Blocker
(1) Minimum delay (delay control to extreme coun-
terclockwise position before first detent) 1/2 to 2 sec-
onds.
(2) Maximum delay (delay control to extreme clock-
wise position before off detent) 10 to 30 seconds.
(3) If there is excessive delay or no variations in
delay proceed to intermittent wipe switch test.
(5) Remove 6 screws holding knee blocker.
(6) Remove steering column retaining nuts.
(7) Lower steering column to gain access to rear of
multifunction switch.
(8) Remove switch connector (Figs. 3 and 4).
If the problem occurs only in the DELAY mode, the
following tests are to be performed. These tests in-
volve disconnecting the intermittent wipe control unit
which can be found on a bracket located on the driv-
er’s side kick panel.
CONDITION
In DELAY mode wipers run continually when
wash is operated but do not provide an extra
wipe when the wash control is released.
PROCEDURE
Replace the control unit.
CONDITION
Wipers start erratically during DELAY mode.
CONDITION
Excessive delay (more than 30 seconds) or in-
adequate variation in delay.
PROCEDURE
(1) Verify that the ground connection at the instru-
ment panel is making good connection (free from
paint) and is tight.
PROCEDURE
Variations in delay should be as follows:
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8K - 4 WINDSHIELD WIPER AND WASHER SYSTEMS
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(2) Verify that the wiring ground connections are
tight and have good contact.
(3) Verify that the wiring ground connections for
the intermittent wipe control unit and the wiper
switch are tight.
(4) If condition is not corrected, replace control
unit.
INTERMITTENT WIPE SWITCH CONTINUITY
CHART
MULTIFUNCTION (INTERMITTENT WIPER) SWITCH
TESTING PROCEDURES
INTERMITTENT WIPER SYSTEM SCHEMATIC
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WINDSHIELD WIPER AND WASHER SYSTEMS
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WIPER SWITCH REPLACEMENT
REMOVAL
(1) Disconnect negative cable from the battery.
(2) Remove tilt lever (tilt column only).
(3) Remove both upper and lower steering column
covers. Requires removal of 3 screws (Torx T-20).
(4) Remove 4 screws holding steering column trim
panel (Fig. 2).
(5) Remove 6 screws holding knee blocker.
(6) Remove steering column retaining nuts.
(7) Lower steering column to gain access to rear of
multifunction switch.
(8) Remove multifunction switch tamper proof
mounting screws (tamper proof torx bit Snap-On
TTXR20B2 or equivalent required).
(9) Gently pull switch away from column. Loosen
connector screw. The screw will remain in the connec-
tor.
(10) Remove wiring connector from multifunction
switch (Fig. 5).
Fig. 6 Washer Reservoir Mounting
(3) Drain washer reservoir.
(4) Using a deep socket, remove filter nut(s) from
bottom inside reservoir and remove pump.
(5) Reverse the removal procedure to install a new
pump(s).
WIPER MOTOR REPLACEMENT
REMOVAL
(1) Remove wiper arms by lifting up wiper arm and
slide tap out.
(2) Remove 6 screws holding the cowl grille (Fig. 7).
Fig. 5 Multifunction Switch
INSTALLATION
(1) Install wiring connector to switch and tighten
connector retaining screw to 2 N
I
m (17 in. lbs.).
(3) Install steering column. Tighten nuts to (105 in.
lbs.).
(4) Install knee blocker and trim panel.
(5) Install steering column covers. Torque screws to
2N
I
m (17 in. lbs.).
(6) Install tilt lever (tilt column only).
(7) Install battery negative cable.
(8) Check all functions of switch for proper opera-
tion.
I
Fig. 7 Wiper Linkage Removal
WASHER PUMP REPLACEMENT
(1) Remove 3 screws holding reservoir to driver’s
fender (Fig. 6)
(2) Disconnect hose from pump(s) (Fig. 6).
(3) Disconnect washer hose and set cowl grille
aside.
(4) Remove 5 bolts holding wiper linkage assembly.
m (17 in. lbs.).
(2) Mount multifunction switch to column and
torque retaining screws to 2 N
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