Lexus SC300 / Lexus SC400. 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 

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.

–

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–124

)

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