light LEXUS GS400 2000 Service Manual PDF

I04298
º0º Mark
(Horizontal Alignment)A
B
Lens BE±48
± BODY ELECTRICALHEADLIGHT AND TAILLIGHT SYSTEM
2349 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(e) Horizontal Alignment:
Adjust the headlight aimming.
If the edge of the lens does not match the paper as shown
in the illustration, adjust the lens using bolt B. (See step
5)
HINT:
After adjusting the headlight in vertical direction, check that the
light has been shifted from the adjusted position in the horizon-
tal direction.

BE01R±06
I01351
Headlight Beam Level Control Actuator
Height Control SensorHeadlight Beam Level Control ECU
Driver Side Junction Block

ECU±IG Fuse

GAUGE Fuse
± BODY ELECTRICALHEADLIGHT BEAM LEVEL CONTROL SYSTEM
BE±49
2350 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
HEADLIGHT BEAM LEVEL CONTROL 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.

BE0HP±02
I03440
1 2 3
4 5 6
I05442
Wire Harness Side BE±50
± BODY ELECTRICALHEADLIGHT BEAM LEVEL CONTROL SYSTEM
2351 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT HEADLIGHT BEAM LEVEL CONTROL AC-
TUATOR RESISTANCE
(a) Check that continuity exists between terminals 2 and 5.
(b) Check that resistance exists between terminals, as
shown in the chart.
TerminalResistance (W)
2 ± 126 ± 30
2 ± 326 ± 30
2 ± 426 ± 30
2 ± 626 ± 30
5 ± 126 ± 30
5 ± 326 ± 30
5 ± 426 ± 30
5 ± 626 ± 30
If resistance value is not as specified, replace the actuator.
2. INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU
CIRCUIT
Connector disconnected:
Disconnect the connector from the ECU and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
A1 ± A5Ignition switch OFF26 ± 30 W
A1 ± A6Ignition switch OFF26 ± 30 W
A1 ± A7Ignition switch OFF26 ± 30 W
A1 ± A8Ignition switch OFF26 ± 30 W
A4 ± B4Ignition switch ON and light control switch HEADBelow 1.5 V
B1 ± B3Ignition switch OFF3.5 ± 6.5 kW
B5 ± B7Ignition switch OFF3.5 ± 6.5 kW
A4 ± GroundIgnition switch OFFContinuity
If circuit is not as specified, perform the inspection on the follow-
ing pages.

I05442
I05441
13 m sec./ DivisionMotor operating 5V
/ Division
GND Pulse generation
± BODY ELECTRICALHEADLIGHT BEAM LEVEL CONTROL SYSTEM
BE±51
2352 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
3. INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU
CIRCUIT
Connector connected:
Connect the connector from the ECU and inspect the connec-
tor, as shown in the table.
Tester connectionConditionSpecified condition
A1 ± A4Ignition switch ONBattery positive voltage
A1 ± A5Ignition switch ON, when stopping and bouncing
the vehicle.Pulse generation
A1 ± A6Ignition switch ON, when stopping and bouncing
the vehicle.Pulse generation
A1 ± A7Ignition switch ON, when stopping and bouncing
the vehicle.Pulse generation
A1 ± A8Ignition switch ON, when stopping and bouncing
the vehicle.Pulse generation
B2 ± B3Ignition switch ONApprox. 2.5 V
B6 ± B7Ignition switch ONApprox. 2.5 V
B1 ± B3
B5 ± B7Ignition switch ON5 V
If the circuit is not as specified, replace the ECU.
Reference INSPECTION USING OSCILLOSCOPE
HINT:
The correct waveform is as shown in the illustration.

BE0H2±08
I01352
Front Fog Lights
Combination Switch

Front Fog Light Switch Driver Side Junction Block

FOG Fuse

Fog Light Relay

Body ECU No.2
BE±52
± BODY ELECTRICALFOG LIGHT SYSTEM
2353 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
FOG LIGHT 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.

I04040
ON
OFF
BE0H3±02
I04034
Wire Harness Side
11
± BODY ELECTRICALFOG LIGHT SYSTEM
BE±53
2354 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT FOG LIGHT SWITCH CONTINUITY
Switch positionTester connectionSpecified condition
OFF±No continuity
ON11 ± 12Continuity
If continuity is not as specified, replace the switch.
2. INSPECT FOG LIGHT SWITCH CIRCUIT
Connector disconnected:
(See page DI±832)
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
11 ± GroundLight control switch TAIL or HEAD and dimmer
switch LOW or HIContinuity
If circuit is not as specified, inspect the wire harness.

I04035
From Back Side
11
I01200
2 1
35
2 5
1 3
BE±54
± BODY ELECTRICALFOG LIGHT SYSTEM
2355 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
3. INSPECT FOG LIGHT SWITCH CIRCUIT
Connector connected:
Connect the wire harness side connector to the light control and
dimmer switch and inspect the connector from the back side, as
shown.
Tester connectionConditionSpecified condition
11 ± GroundLight control switch HEAD and headlight dimmer
switch LO and fog light switch ONNo voltage
11 ± GroundLight control switch HEAD and headlight dimmer
switch HI or FLASH and fog light switch ONBattery positive voltage
If circuit is not as specified, inspect the wire harness.
4. INSPECT FOG LIGHT RELAY CONTINUITY
ConditionTester connectionSpecified condition
Constant1 ± 2Continuity
Apply B+ between
terminals 1 and 2.3 ± 5Continuity
If continuity is not as specified, replace the relay.
5. INSPECT FOG LIGHT RELAY CIRCUIT
(See page BE±21)

BE0H0±06
I01353
Turn Signal LightsEngine Room No.1
Junction Block

TURN HAZ Fuse
Ignition Switch
Combination Switch

Turn Signal Switch
Hazard Warning Switch
Turn Signal Lights Turn Signal Lights
Driver Side Junction Block

GAUGE FuseCowl Side No.5
Junction Block

Turn Signal Flaher
± BODY ELECTRICALTURN SIGNAL AND HAZARD WARNING SYSTEM
BE±55
2356 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
TURN SIGNAL AND HAZARD WARNING 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.

BE0GY±05
I01354
Front Personal Light
Rear Personal Light
Door Courtesy Light
Licence Plate Light Luggage Compartment Light
Door Courtesy Lights
Luggage Compartment
Courtesy Switch
Door Courtesy Light
Vanity Light
Vanity Light
Rheostat Light Control
Glove Compartment
Door Courtesy Light
Glove Compartment
Door Courtesy Switch
Passenger Side Junction Block

DOME Fuse

Body ECU No.1
Driver Side Junction Block

Body ECU No.2
Luggage
Compartment
Key Lock and
Unlock Switch
Rear Personal Light Rear Personal Light
± BODY ELECTRICALINTERIOR LIGHT SYSTEM
BE±59
2360 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INTERIOR LIGHT SYSTEM
LOCATION

I04047
DOOR OFF ON
DOOR OFF ON w/ Sliding Roof w/o Sliding Roof
BE0GZ±03
I04048
Wire Harness Side BE±60
± BODY ELECTRICALINTERIOR LIGHT SYSTEM
2361 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT FRONT PERSONAL LIGHT SWITCH CONTI-
NUITY
Switch positionTester connectionSpecified condition
Interior light switch
OFF (Lever switch)±No continuity
Interior light switch
DOOR (Lever switch)1 ± 3Continuity
Interior light switch
ON (Lever switch)1 ± 2Continuity
*Personal light OFF
(Push switch)±No continuity
*Personal light ON
(Push switch)1 ± 2Continuity
*: Set the interior light switch to OFF or DOOR.
If continuity is not as specified, replace the light assembly or
bulb.
2. INSPECT FRONT PERSONAL LIGHT SWITCH CIR-
CUIT
(See page DI±843)
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
2 ± GroundConstantContinuity
1 ± GroundConstantBattery positive voltage
If circuit is not as specified, inspect power source or wire har-
ness.