Lexus LS400 (2000 year). Service manual — part 63

N08710

Z08754

Wire Harness Side

BE–80

–

BODY ELECTRICAL

HEADLIGHT CLEANER SYSTEM

1943

Tester connection

Condition

Specified condition

4 – Ground

Ignition switch ON and light control switch turned

to HEAD cleaner switch OFF

No continuity

4 – Ground

Ignition switch ON and light control switch turned

to HEAD cleaner switch ON

Continuity

3 – Ground

2 – Ground

Constant

Continuity

1 – Ground

Ignition switch position LOCK or ACC

No voltage

1 – Ground

Ignition switch position ON

Battery positive voltage

5 – Ground

Constant

Battery positive voltage

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

5.

INSPECT HEADLIGHT CLEANER MOTOR OPERA-
TION

Connect the positive (+) lead from the battery to terminal 2 and
the negative (–) lead to terminal 1, and check that the motor op-
erates.
NOTICE:
This tests must be performed quickly (within 20 seconds)
to prevent the coil from burning out.
If operation is not as specified, replace the motor.

6.

INSPECT HEADLIGHT CLEANER MOTOR CIRCUIT

Disconnect the connector from the cleaner motor and inspect
the connector on harness side, as shown.

Tester connection

Condition

Specified condition

2 – Ground

Constant

Continuity

1 – Ground

Constant

Battery positive voltage

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

BE0BX–01

I03233

Instrument Panel Junction Block

WIPER Fuse

Washer Tank

Body ECU

Wiper and Washer Switch

Washer Motor

Wiper Motor
and Links

–

BODY ELECTRICAL

WIPER AND WASHER SYSTEM

BE–81

1944

WIPER AND WASHER SYSTEM

LOCATION

BE0BY–01

N16900

Reference

ON

OFF

MIST

INT

LO

HI

OFF

N13318

From Back Side

N09338

BE–82

–

BODY ELECTRICAL

WIPER AND WASHER SYSTEM

1945

INSPECTION

1.

INSPECT WIPER AND WASHER SWITCH CONTINU-
ITY

Switch position

Tester connection

Specified condition

Wiper OFF

7 – 16

Continuity

Wiper OFF and MIST

7 – 17

Continuity

Wiper INT

7 – 16

2 – 4

Continuity

Wiper INT and MIST

7 – 17

2 – 4

Continuity

Wiper LO

7 – 17

Continuity

Wiper LO and MIST

7 – 17

Continuity

Wiper HI

8 – 17

1 – 2

Continuity

Wiper HI and MIST

8 – 17

1 – 2

Continuity

Washer OFF

–

No continuity

Washer ON

2 – 11

Continuity

If continuity is not as specified, replace the switch.
2.

INSPECT WIPER AND WASHER SWITCH CIRCUIT

Disconnect the switch and wiper relay connector, and inspect
the each connector on the wire harness side, as shown.

Tester connection

Condition

Specified condition

2 – Ground

Constant

Continuity

17 – Ground

Ignition switch LOCK or ACC

No voltage

17 – Ground

Ignition switch ON

Battery positive voltage

If the circuit is not as specified, inspect the circuits connected
to other parts.

3.

INSPECT WIPER MOTOR OPERATION
Low Speed:

Connect the positive (+) lead from the battery to terminal 3 and
the negative (–) lead to terminal 1, and check that the motor op-
erates at low speed.
If operation is not as specified, replace the motor.

N09339

N09340

Z14900

Z08755

Wire Harness Side

–

BODY ELECTRICAL

WIPER AND WASHER SYSTEM

BE–83

1946

4.

INSPECT WIPER MOTOR OPERATION
High Speed:

Connect the positive (+) lead from the battery to terminal 2 and
the negative (–) lead to terminal 1, and check that the motor op-
erates at high speed.
If operation is not as specified, replace the motor.

5.

INSPECT WIPER MOTOR OPERATION
Stopping at Stop Position:

(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 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, and check that
the motor stops running at the stop position after the mo-
tor operates again.

If operation is not as specified, replace the motor.

6.

INSPECT WIPER MOTOR CIRCUIT

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

Tester connection

Condition

Specified condition

1 – Ground

Constant

Continuity

6 – Ground

Ignition switch position LOCK or ACC

No voltage

6 – Ground

Ignition switch position ON

Battery positive voltage

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