ect LEXUS SC300 1991 Service Repair Manual

WIPER AND WASHER SYSTEM
DESCRIPTION
The component parts of this system and their functions are described in the\
following table.
Parts NameFunction
Wiper Switch
This switch changes the current from the wiper motor in order to operate\
the wiper motor
at different speeds.
It also has a built±in variable resistor which is used to adjust the \
interval for intermittent
operation.
Wiper RelayThis relay turns the current to the wiper motor ON and OFF at intervals \
and operates the
wipers continuously when the washer switch is ON.
Wiper MotorSwitching of the current at the wiper switch and wiper relay operates th\
e motor at each speed
(HI, LO) and at intervals (INT), thus moving the wiper arms and blad\
es.
Washer SwitchBy grounding current from the washer motor, this switch operates the washer motor.
Washer MotorA pump in this motor pumps washer fluid and sprays it out from the washe\
r nozzles.
Parts Location
BE±84±
BODY ELECTRICAL SYSTEM Wiper and Washer System
WhereEverybodyKnowsYourName

Parts Location (Cont'd)
±
BODY ELECTRICAL SYSTEM Lighting SystemBE±85
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Wiring And Connector Diagrams
BE±86±
BODY ELECTRICAL SYSTEM Wiper and Washer System
WhereEverybodyKnowsYourName

Parts Inspection
(Wiper Motor and Link Assembly)
COMPONENTS
±
BODY ELECTRICAL SYSTEM Lighting SystemBE±87
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REMOVAL OF WIPER MOTOR AND LINK
ASSEMBLY
1. REMOVE WIPER ARM AND BLADE ASSEMBLY
2. REMOVE COWL TOP LOUVER(a) Remove hood to cowl seal.
(b) Remove cowl louver.HINT: Raise the front side of the cowl louver up and remove
the cowl louver.
3. REMOVE WIPER MOTOR AND LINK ASSEMBLY (a) Remove five set bolts.
(b) Disconnect connector.
(c) Raise the front side of the wiper motor and link assembly
up and remove the wiper motor and link assembly.
(d) Remove wiper motor cover.
INSTALLATION OF WIPER MOTOR AND
LINK ASSEMBLY
1. INSTALL WIPER MOTOR AND LINK ASSEMBLY (a) Install wiper motor cover.
(b) Install wiper motor and link assembly.
(c) Connect the connector.
(d) Install and torque the four bolts.
Torque: 5.4 N Vm (55 kgf Vcm, 48 in. Vlbf)
2. INSTALL COWL LOUVER
(a) Install cowl louver. HINT: With the front side of the louver raised, install the
protector on the glass, then push the louver down.
(b) Install hood to cowl seal.
BE±88
±
BODY ELECTRICAL SYSTEM Wiper and Washer System
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3. INSTALL WIPER ARM AND BLADE ASSEMBLY(a) Install the wiper arms and bl ades, and operate the
wipers once and turn the wiper switch OFF.
(b) Adjust the installation positions of the wiper arms and
blades to the positions shown in the figure.
(A) Approx. 44.0 mm (1.734 in.)
(B) Approx. 45.0 mm (1.773 in.)
Torque the nut.
Torque: 20 N Vm (205 kgf Vcm, 15 ft Vlbf)
DISASSEMBLY OF WIPER MOTOR AND
LINK ASSEMBLY
1. REMOVE CASE ROD AND WIPER LINK NO.1 ROD
2. REMOVE WIPER MOTOR
(a) Remove wire harness clamp and three bolts and a nut.
(b) Remove wiper motor.
ASSEMBLY OF WIPER MOTOR AND
LINK ASSEMBLY
1. INSTALL WIPER MOTOR(a) Connect the wiper motor connector.
(b) Operate the wiper motor once and turn the wiper switch OFF.
(c) Install wiper motor as shown in the figure.
(d) Install wire harness clamp.
(e) Install three bolts and a nut.
Torque:
BOLT: 5.4 N Vm (55 kgf Vcm, 48 in. Vlbf)
NUT: 17 N Vm (175 kgf Vcm, 13 ft Vlbf)
2. INSTALL CASE ROD AND WIPER LINK NO.1 ROD
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BODY ELECTRICAL SYSTEM Lighting SystemBE±89
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INSPECTION OF WIPER MOTOR
INSPECT MOTOR(Operation at Low Speed)
Connect the positive (+) lead from the battery to terminal 3
and the negative (±) lead to terminal 1, check that the motor
operates at low speed.
If operation is not as specified, replace the motor.
(Operation at High Speed)
Connect the positive (+) lead from the battery to terminal 2
and the negative (±) lead to terminal 1, check that the motor
operates at high speed.
If operation is not as specified, replace the motor.
(Operation, Stopping at Stop Position)
(a) Operate the motor at low speed and stop the motor operation anywhere except at the stop position by
disconnecting positive (+) lead from terminal 3.
(b) Connect terminals 3 and 5.
(c) Connect the positive (+) lead from the battery to terminal
6 and the negative (±) lead to terminal 1, check that the
motor stops running at the stop position after the motor
operates again.
If operation is not as specified, replace the motor.
(Motor Circuit)
Disconnect the connector from the motor and inspect the
connector on the wire harness side as shown.
BE±90
±
BODY ELECTRICAL SYSTEM Wiper and Washer System
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Check forTester connectionConditionSpecified value
Continuity1±GroundConstantContinuity
Voltage2±GroundWiper switch position
(I iti it h ON)
HIGH or MISTBattery positive voltage2±Ground(Ignition switch ON)OFF or INT, LOWNo voltage
3±GroundWiper switch position
(I iti it h ON)
LOW and MISTBattery positive voltage3±Ground(Ignition switch ON)OFF or INT, HIGHNo voltage
6±GroundIgnition switchLOCK or ACCNo voltage6±GroundONBattery positive voltage
If circuit is not as specified, refer to BE±86 wiring diagram and
inspect the circuits connected to other parts.
(Combination Switch)
INSPECT WIPER AND WASHER SWITCH
(See page BE±46)
(Continuity)
Inspect the switch continuity between terminals.
If continuity is not as specified, replace the switch.
(Resistance)
Inspect the switch resistance between terminals.
If resistance value is not as specified, replace the switch.
(Switch Circuit)
Disconnect the switch and wiper relay connector, inspect
each connector on the wire harness side as shown.
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BODY ELECTRICAL SYSTEM Wiper and Washer SystemBE±91
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Check forTester connectionConditionSpecified value
VoltageA14±GroundIgnition switchpositionLOCK or ACCNo voltageA14±GroundIgnition switch positionONBattery positive voltage
ContinuityA6±GroundConstantContinuity
(Washer Motor and Tank)
REMOVAL AND INSTALLATION OF
WASHER MOTOR AND TANK
1. REMOVE WASHER TANK AND WASHER MOTOR(a) Remove fender liner.
(b) Disconnect connector and hose.
(c) Remove three screws and tank.
(d) Separate tank and washer motor.
2. INSTALL WASHER TANK AND MOTOR For installation follow the removal procedure in reverse.
INSPECTION OF WASHER MOTOR
INSPECT WASHER MOTOR
(Operation)
Connect the positive (+) lead from the battery to terminal 2
and the negative (±) lead to terminal 1, check that the motor
operates.
NOTICE: There tests must be performed quickly (within
20 seconds) to prevent the coil from burning out.
If operation is not as specified, replace the motor.
(Circuit)
Disconnect the connector from the washer motor and inspect
the connector on harness side as shown.
Check forTester connectionConditionSpecified value
Continuity1±GroundPush washer switch ONContinuity
Voltage2±GroundTurn ignition switch ONBattery positive voltage
If circuit is not as specified, inspect wire harness, power
source or wiper switch.
(Window Washer Level Warning Switch)
(See page BE±124)
BE±92
±
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(Washer Hose and Nozzle)
REMOVAL AND INSTALLATION OF
WASHER HOSE AND NOZZLE
1. REMOVE WASHER HOSE(a) Remove fender liner.
(b) Disconnect washer hose from washer motor.
(c) Remove the hose clamps as shown.HINT: When installing or removing the hose clamp on the un-
derside of the engine hood, remove the clip on the underside
of the silencer.
(d) Remove service hole grommet and disconnect the hose from washer nozzle.
2. INSTALL WASHER HOSE For installation follow the removal procedure in reverse.
HINT: During assembly, the washer hose should be passed
under neath the engine hood hinge on the body side.
3. REMOVE WASHER NOZZLE (a) Remove service hole grommet.
(b) Disconnect washer hose from nozzle.
(c) Press on the claw on the underside of the nozzle and remove it from above.
4. INSTALL WASHER NOZZLE For installation follow the removal procedure in reverse.
ADJUSTMENT OF WASHER NOZZLE
1. INSPECT WASHER NOZZLE
(a) While operating the washer, check whether the upper point where the washer fluid hits the windshield and the
up surge area are within the range indicated by the
hatched line.
(A) Approx. 150 mm (5.91 in.)
(B) Approx. 50 mm (1.99 in.)
(C) Approx. 0±1000 mm (0±3.94 in.)
(b) Check if the lower point where the washer fluid hits thewindshield is within the range of the wiping pattern (the
area of the glass which is wiped by the wiped blades.)
2. ADJUST WASHER NOZZLE Using a tool like that shown in the figure, change the direction
of the nozzle hole to adjust the point where washer fluid
strikes the windshield.
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BODY ELECTRICAL SYSTEM Wiper and Washer SystemBE±93
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