Lexus SC300 / Lexus SC400. Service manual — part 223
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
Check for
Tester connection
Condition
Specified value
Continuity
1–Ground
Constant
Continuity
Voltage
2–Ground
Wiper switch position
(I
iti
it h ON)
HIGH or MIST
Battery positive voltage
2–Ground
(Ignition switch ON)
OFF or INT, LOW
No voltage
3–Ground
Wiper switch position
(I
iti
it h ON)
LOW and MIST
Battery positive voltage
3–Ground
(Ignition switch ON)
OFF or INT, HIGH
No voltage
6–Ground
Ignition switch
LOCK or ACC
No voltage
6–Ground
ON
Battery positive voltage
If circuit is not as specified, refer to
inspect the circuits connected to other parts.
(Combination Switch)
INSPECT WIPER AND WASHER SWITCH
(See page
(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.
–
BODY ELECTRICAL SYSTEM
Wiper and Washer System
BE–91
Check for
Tester connection
Condition
Specified value
Voltage
A14–Ground
Ignition switch position
LOCK or ACC
No voltage
A14–Ground
Ignition switch position
ON
Battery positive voltage
Continuity
A6–Ground
Constant
Continuity
(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 for
Tester connection
Condition
Specified value
Continuity
1–Ground
Push washer switch ON
Continuity
Voltage
2–Ground
Turn ignition switch ON
Battery positive voltage
If circuit is not as specified, inspect wire harness, power
source or wiper switch.
(Window Washer Level Warning Switch)
(See page
BE–92
–
BODY ELECTRICAL SYSTEM
Wiper and Washer System
(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 the
windshield 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.
–
BODY ELECTRICAL SYSTEM
Wiper and Washer System
BE–93
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