Lexus RX300 (MCU15). Manual — part 127

I19142

Washer Motor

Washer Tank

Instrument Panel J/B
D WIPER Fuse

Front Wiper Motor
and Link

Wiper and Washer Switch

Ignition Switch

Rear Wiper Motor

BE05B–05

–

BODY ELECTRICAL

WIPER AND WASHER SYSTEM

BE–55

LEXUS RX300 (RM785E)

WIPER AND WASHER SYSTEM

LOCATION

BE0UE–02

N21362

OFF

INT

LO

HI

2

Washer ON

7

8

11

16

17

N10429

ę

Ĝ

7

16

2

V03883

INT time control

switch position

Approx. 1–3 secs.

Battery voltage

0 volt

FAST

SLOW

Voltage

Approx. 10–15 secs.

Battery voltage

0 volt

BE–56

–

BODY ELECTRICAL

WIPER AND WASHER SYSTEM

LEXUS RX300 (RM785E)

INSPECTION

1.

INSPECT FRONT WIPER AND WASHER SWITCH
CONTINUITY

Switch position

Tester connection

Specified condition

OFF

7 – 16

Continuity

INT

7 – 16

Continuity

LO

7 – 17

Continuity

HI

8 – 17

Continuity

Washer ON

2 – 11

Continuity

If continuity is not as specified, replace the switch.

2.

INSPECT INTERMITTENT OPERATION

(a)

Turn the wiper switch to INT position.

(b)

Turn the intermittent time control switch to FAST position.

(c)

Connect the positive (+) lead from the battery to terminal
16 and the negative (–) lead to terminal 2.

(d)

Connect the positive (+) lead from the voltmeter to termi-
nal 7 and the negative (–) lead to terminal 2, check that
the meter needle indicates battery voltage.

If operation is not as specified, replace the wiper and washer
switch.

I03106

Washer1

ON

INT

OFF

Washer2

N11243

ę

Ĝ

7

16

2

N11301

Washer Switch ON

OFF

Less than 1sec.

Approx. 3secs.

Battery Voltage

0 V

N21363

Wire Harness Side

1

2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18

–

BODY ELECTRICAL

WIPER AND WASHER SYSTEM

BE–57

LEXUS RX300 (RM785E)

3.

INSPECT REAR WIPER AND WASHER SWITCH CON-
TINUITY

Switch position

Tester connection

Specified condition

Washer 1

2 – 12

Continuity

Wiper OFF

–

No continuity

Wiper INT

2 – 13

Continuity

Wiper ON

2 – 10

Continuity

Washer 2

2 – 10 – 12

Continuity

If continuity is not as specified, replace the switch.

4.

INSPECT WASHER LINKED OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
16 and the negative (–) lead to terminal 2.

(b)

Connect the positive (+) lead from the voltmeter to termi-
nal 7 and the negative (–) lead to terminal 2.

(c)

Push in the washer switch, and check that the voltage
changes as shown in the chart.

If operation is not as specified, replace the wiper and washer
switch.

5.

INSPECT WIPER SWITCH CIRCUIT

Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.

Tester connection

Condition

Specified condition

2 – Ground

Constant

Continuity

11 – Ground

Ignition switch LOCK or ACC

No voltage

11 – Ground

Ignition switch ON

Battery voltage

If circuit is not as specified, inspect the circuits connected to oth-
er parts.

I04530

1

5

I04531

5

4

I04532

5

1

I04533

1

3

5

2

I04534

2

3

BE–58

–

BODY ELECTRICAL

WIPER AND WASHER SYSTEM

LEXUS RX300 (RM785E)

6.

Low Speed:
INSPECT FRONT WIPER MOTOR OPERATION

Connect the positive (+) lead from the battery to terminal 1 and
the negative (–) lead to terminal 5, check that the motor oper-
ates at low speed.
If operation is not as specified, replace the motor.

7.

High Speed:
INSPECT FRONT WIPER MOTOR OPERATION

Connect the positive (+) lead from the battery to terminal 4 and
the negative (–) lead to terminal 5, check that the motor oper-
ates at high speed.
If operation is not as specified, replace the motor.

8.

Stopping at Stop Position:
INSPECT FRONT WIPER MOTOR OPERATION

(a)

Operate the motor at low speed and stop the motor opera-
tion anywhere except at the stop position by disconnect-
ing positive (+) lead from terminal 1.

(b)

Connect terminals 1 and 3.

(c)

Connect the positive (+) lead from the battery to terminal
2 and negative (–) lead to terminal 5, check that the motor
stops running at the stop position after the motor operates
again.

If operation is not as specified, replace the motor.

9.

INSPECT REAR WIPER OPERATION

Connect the positive (+) lead from the battery to terminal 2 and
the negative (–) lead to terminal 3, check that the motor oper-
ates.
If operation is not as specified, replace the motor.