LEXUS GS400 2000 Service Repair Manual

BE0GX±05
BE±68
± BODY ELECTRICALBACK±UP LIGHT SYSTEM
2369 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
INSPECT PARK/ NEUTRAL POSITION SWITCH CONTINU-
ITY
(See page DI±372)

BE0H6±08
I01356
Stop Light Switch
Driver Side Junction Block

STOP Fuse
Light Failure Sensor
Stop Lights
± BODY ELECTRICALSTOP LIGHT SYSTEM
BE±69
2370 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
STOP LIGHT SYSTEM
LOCATION

BE0H7±04
I04062
1 2
3 4
Pushed inFree
I04063
Wire Harness Side
I04064
w/ Rear spoiler type w/o Rear spoiler BE±70
± BODY ELECTRICALSTOP LIGHT SYSTEM
2371 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT STOP LIGHT SWITCH CONTINUITY
Switch positionTester connectionSpecified condition
Switch pin free
(Pedal depressed)±No continuity
Switch pin pushed in
(Pedal released)1 ± 2Continuity
Switch pin free
(Pedal depressed)±No continuity
Switch pin pushed in
(Pedal released)3 ± 4Continuity
If continuity is not as specified, replace the switch.
2. INSPECT STOP LIGHT SWITCH CIRCUIT
(See page DI±839)
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
2 ± GroundConstantBattery positive voltage
If circuit is not as specified, inspect the power source or wire
harness.
3. INSPECT HI±MOUNTED STOP LIGHT CONTINUITY
Using an ohmmeter, check that continuity exists between termi-
nals.
If continuity is not as specified, replace the light assembly or
bulb.

I04053
Wire Harness Side
± BODY ELECTRICALSTOP LIGHT SYSTEM
BE±71
2372 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
4. INSPECT HI±MOUNTED STOP LIGHT CIRCUIT
Disconnect the connector from the light and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
2 ± GroundConstantContinuity
If circuit is not as specified, inspect the power source or wire
harness.
5. INSPECT LIGHT FAILURE SENSOR
(See page DI±841 and BE±92)

BE023±07
I01357
Headlight Cleaner Relay Washer Tank

Headlight Cleaner Motor
Headlight Cleaner Switch
Headlight Cleaner Nozzle
Engine Room No.1
Junction Block

H±LP CLN H±Fuse
Ignition Switch
Driver Side Junction Block

WASHER Fuse
BE±72
± BODY ELECTRICALHEADLIGHT CLEANER SYSTEM
2373 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
HEADLIGHT CLEANER SYSTEM
LOCATION
The vehicle shown in this illustration is ºGS400º.
All components of ºGS300º other than the ones used for engine are same as ºGS400º.

BE0HM±03
I04065
I01290
12
34 5 6 Wire Harness Side
e±6±1
I01687
1 2 3
4
5
± BODY ELECTRICALHEADLIGHT CLEANER SYSTEM
BE±73
2374 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT HEADLIGHT CLEANER SWITCH CONTINU-
ITY
Switch positionTester connectionSpecified condition
OFF±No continuity
ON2 ± 4Continuity
Illumination circuit5 ± 6Continuity
If continuity is not as specified, replace the switch.
2. INSPECT HEADLIGHT CLEANER SWITCH CIRCUIT
Disconnect the switch connector and inspect the connector on
wire harness side, as shown.
Tester connectionConditionSpecified condition
1 ± GroundHeadlight ONContinuity
1 ± GroundHeadlight OFFNo continuity
If circuit is not as specified, inspect the circuits connected to oth-
er parts.
3. INSPECT HEADLIGHT CLEANER RELAY OPERATION
(a) Check that no continuity exists between terminals 2 and
5.
(b) Connect the positive (+) lead from the battery to terminals
1 and 5, and the negative (±) lead to terminal 3.
(c) Connect the negative (±) lead from the battery to terminal
4, and check that continuity exists between terminals 2
and 5 for 0.9 ± 1.1 seconds, then no continuity exists.
If operation is not as specified, replace the motor.

I04067
Wire Harness Side
I04068
2 1
I04069
Wire Harness Side BE±74
± BODY ELECTRICALHEADLIGHT CLEANER SYSTEM
2375 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
4. INSPECT HEADLIGHT CLEANER RELAY CIRCUIT
Disconnect the connector from the relay and inspect the con-
nector on wire harness side, as shown.
Tester connectionConditionSpecified condition
2 ± Ground
3 ± GroundConstantContinuity
4 ± GroundIgnition switch ON, light control switch in HEAD
and cleaner switch OFFNo continuity
4 ± Ground
Ignition switch ON, light control switch in HEAD
and cleaner switch ON or daytime running light
system operating
Continuity
1 ± GroundIgnition switch OFF or ACCNo voltage
1 ± GroundIgnition switch ONBattery positive voltage
5 ± GroundConstantBattery 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, check that the motor oper-
ates.
NOTICE:
These 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 wire harness side, as shown.

± BODY ELECTRICALHEADLIGHT CLEANER SYSTEM
BE±75
2376 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)Tester connection
ConditionSpecified condition
2 ± GroundConstantContinuity
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

BE0HN±07
I01358
Wiper Motor
Washer Tank

Washer Motor
Combination Switch

Wiper and Washer Switch
Driver Side Junction Block

WIPER Fuse

WASHER Fuse
Ignition Switch
BE±76
± BODY ELECTRICALWIPER AND WASHER SYSTEM
2377 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
WIPER AND WASHER SYSTEM
LOCATION
The vehicle shown in this illustration is ºGS400º.
All components of ºGS300º other than the ones used for engine are same as ºGS400º.

BE0HO±04
I04070
OFF
INT
LO
HIWasher ON
I04034
Wire Harness Side
2
17
I04071
54
± BODY ELECTRICALWIPER AND WASHER SYSTEM
BE±77
2378 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT WIPER AND WASHER SWITCH CONTINU-
ITY
Switch positionTester connectionSpecified condition
OFF7 ± 16Continuity
INT7 ± 16Continuity
LO7 ± 17Continuity
HI8 ± 17Continuity
Washer OFF±No continuity
Washer ON2 ± 11Continuity
If continuity is not as specified, replace the switch.
2. INSPECT WIPER AND WASHER SWITCH CIRCUIT
Connector disconnected:
Disconnect the connector from the motor and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
2 ± GroundConstantContinuity
17 ± GroundIgnition switch LOCK or ACCNo voltage
17 ± GroundIgnition switch ONBattery positive voltage
If circuit is not as specified, inspect the circuits connected to oth-
er parts.
3. INSPECT WIPER MOTOR OPERATION
Low speed:
Connect the positive (+) lead from the battery to terminal 5 and
the negative (±) lead to terminal 4, check that the motor oper-
ates at low speed.
If operation is not as specified, replace the motor.