bulb LEXUS GS400 2000 Service User Guide

± BODY ELECTRICALTROUBLESHOOTING
BE±9
2310 Author: Date:
2000 LEXUS GS300/GS400 (RM718U) Washer fluid does not operate.
Washer Hose and Nozzle±

When wiper switch is in HI position, the wiper blade is in contact
with the body.

When the wiper switch is OFF, the wiper blade does not retract
or the retract position is wrong.
1. Wiper Motor *1
2. Wire harness *1BE±77
±
*1: Inspect wiper arm and blade set positions.
COMBINATION METER
This system uses the multiplex communication system, so check diagnosis system of the multiplex
communication system before you proceed with troubleshooting.
Refer to DI section for warning light or indicator light not described in the table below.
SymptomSuspect AreaSee page
Driver seat belt warning light does not light up.
1. Bulb
2. Driver Buckle Switch CIrcuit
3. Meter Circuit Plate
4. Wire Harness
5. Body No.2 ECU±
BE±92
BE±92
±
DI±820
Passenger seat belt warning light does not light up.
1. Clock System
2. Passenger Buckle Switch CIrcuit
3. Occupant Detection Sensor
4. Meter Circuit Plate
5. Wire Harness
6. Body No.1 ECUBE±227
BE±92
BE±92
BE±92
±
DI±776
SRS warning light does not light up.
1. MPX±B Fuse
2. SRS±B Fuse
3. Bulb
4. Meter Circuit Plate
5. Wire Harness
6. Airbag Sensor AssemblyBE±21
BE±21
±
BE±92
±
DI±550
Hi±beam indicator light does not light up.
1. Bulb
2. Meter Circuit Plate
3. Wire Harness
4. Headlight System±
BE±92
±
BE±3
Turn indicator light does not light up.
1. Bulb
2. Meter Circuit Plate
3. Wire Harness
4. Turn Signal and Hazard Warning System±
BE±92
±
BE±3
ABS warning light does not light up.
1. GAUGE Fuse
2. Bulb
3. Meter Circuit Plate
4. Wire Harness
5. ABS, TRAC and VSC ECUBE±21
±
BE±92
±
DI±387
TRAC warning light does not light up.
1. GAUGE Fuse
2. Bulb
3. Meter Circuit Plate
4. Wire Harness
5. ABS, TRAC and VSC ECUBE±21
±
BE±92
±
DI±473

BE±10
± BODY ELECTRICALTROUBLESHOOTING
2311 Author: Date:
2000 LEXUS GS300/GS400 (RM718U) Malfunction indicator light does not light up.
1. Bulb
2. Meter Circuit Plate
3. Wire Harness
4. ECM (2JZ±GE)
5. ECM (1UZ±FE)±
BE±92
±
DI±1
DI±156
Fuel level warning light does not light up.
1. Bulb
2. Fuel level warning sensor
3. Meter Circuit Plate
4. Wire Harness±
±
BE±92
±
ELECTRIC TENSION REDUCER SYSTEM
SymptomSuspect AreaSee page
Tension Reducer does not operate.
(Driver's and Passenger's)1. ECU±IG Fuse
2. Wire HarnessBE±21
±
Tension Reducer does not operate.
(Only one side)1. Buckle Switch
2. Tension Reducer Solenoid
3. Wire HarnessBE±92
BE±92
±
DEFOGGER SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
Rear window defogger does not operate.
1. HTR Fuse
2. DEF M±Fuse
3. Defogger Relay Circuit
4. Defogger Switch (in A/C Panel Switch)
5. Defogger Wire
6. Wire Harness
7. Body No.1 ECUBE±21
BE±21
DI±812
BE±108
BE±108
±
DI±776
Mirror defogger does not operate.
1. MIR±HTR Fuse (Passenger SIde J/B)
2. Mirror Heater Relay
3. Mirror Heater
4. Wire HarnessBE±21
BE±108
BE±108
±
POWER WINDOW CONTROL SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
All the power windows do not operate.
(Power Door Lock System is normal.)
1. PWS terminal circuit
2. Power Window Master Switch
3. Wire Harness
4. Driver Door ECU
5. Body No.1 ECUDI±818
BE±117
±
DI±856
DI±776
Only the driver's window does not operate.
1. Power Window Master Switch
2. Power WIndow Switch
3. Power Window Motor
4. Wire HarnessBE±117
BE±117
BE±117
±
ºWindow lock functionº does not operate.1. Power Window Master SwitchBE±117
Window does not operate with power window master switch.
(Manual or Automatic operation can be performed.)TROUBLESHOOTING NO.1BE±111
Remote control of all windows (Except driver's) does not functions
with master switch.
(Windows operate normally with each of master switch.)
TROUBLESHOOTING NO.2BE±111

BE0HA±02
I04033
HI
Flash OFFTAIL HEAD AUTO
LO
± BODY ELECTRICALHEADLIGHT AND TAILLIGHT SYSTEM
BE±37
2338 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. FAIL±SAFE FUNCTION
(Light Control ECU)
When input error is inspected.
When input voltage is not within the range of operation voltage (9 to 16 V),
lighting of the headlight stops. As soon as the voltage comes within the range,
it lights up again.
However if the input voltage becomes low after lighting up,
sufficient voltage is maintained until light of bulb completely goes off.
When output error is inspected (Open or short).
When light flushing is inspected.
When an error occurs in the output voltage (open or short) or flushing symptom
occurs on the bulb, lighting of the headlight stops, the condition is maintained
until power is turned ON again (headlight dimmer switch OFF " ON).
In this case, it can not be judged whether lighting malfunction is caused by an
output error or other reasons (fuse blown out, etc.).
Check that there is no error in fuse and wiring (including power source) and
replace the bulb in the first place, when the error still appears, replace the light
control ECU.
2. INSPECT LIGHT CONTROL SWITCH CONTINUITY
Switch positionTester connectionSpecified condition
OFF±No continuity
TAIL15 ± 16Continuity
HEAD14 ± 15 ± 16Continuity
AUTO13 ± 16Continuity
If continuity is not as specified, replace the switch.
3. INSPECT HEADLIGHT DIMMER SWITCH CONTINU-
ITY
Switch positionTester connectionSpecified condition
Low beam17 ± 18Continuity
High beam8 ± 17Continuity
Flash8 ± 9 ± 17Continuity
If continuity is not as specified, replace the switch.

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.

I04049
I04048
Wire Harness Side
I04050
21
OFFON
± BODY ELECTRICALINTERIOR LIGHT SYSTEM
BE±61
2362 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
3. INSPECT REAR PERSONAL LIGHT SWITCH CONTI-
NUITY
Switch positionTester connectionSpecified condition
Room light switch
OFF and door closed±No continuity
Room light switch
ON and door closed1 ± 2Continuity
Room light switch OFF or
ON and door opened1 ± 3Continuity
If continuity is not as specified, replace the light assembly or
bulb.
4. INSPECT REAR PERSONAL LIGHT SWITCH CIRCUIT
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.
5. INSPECT VANITY LIGHT CONTINUITY
Switch positionTester connectionSpecified condition
OFF (closed)±No continuity
ON (opened)1 ± 2Continuity
If continuity is not as specified, replace the vanity light assembly
or bulb.

I04066
Open Close
1 2
I04052e±2±2±J
21
I04053
Wire Harness Side
I04054
1 2
± BODY ELECTRICALINTERIOR LIGHT SYSTEM
BE±63
2364 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
9. Rear door:
INSPECT DOOR COURTESY SWITCH CONTINUITY
(a) Connect the connector to the rear door ECU.
(b) Check that continuity exists between terminals 1 and 2
when door is opened.
(c) Check that no continuity exists between terminals 1 and
2 when door is closed.
If continuity is not as specified, replace the switch.
10. Rear door:
INSPECT DOOR COURTESY SWITCH CIRCUIT
Rear LH side: (See page DI±930)
Rear RH side: (See page DI±947)
11. INSPECT DOOR COURTESY LIGHT CONTINUITY
Using an ohmmeter, check that continuity exists between termi-
nals.
If continuity is not as specified, replace the light assembly or
bulb.
12. INSPECT DOOR COURTESY LIGHT CIRCUIT
Driver side: (See page DI±874)
Passenger side: (See page DI±906)
Rear LH side: (See page DI±934)
Rear RH side: (See page DI±951)
13. INSPECT LUGGAGE COMPARTMENT DOOR COUR-
TESY SWITCH CONTINUITY
Switch positionTester connectionSpecified condition
OFF (closed)±No continuity
ON (opened)2 ± Switch bodyContinuity
If continuity is not as specified, replace the switch.

I04185
Wire Harness Side
I04056e±2±2±J
I04053
Wire Harness Side BE±64
± BODY ELECTRICALINTERIOR LIGHT SYSTEM
2365 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
14. INSPECT LUGGAGE COMPARTMENT DOOR COUR-
TESY SWITCH CIRCUIT
(See page DI±792)
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
2 ± Body groundLuggage compartment door courtesy switch ON
(door opened)Continuity
If circuit is not as specified, inspect power source or wire har-
ness.
15. INSPECT LUGGAGE COMPARTMENT LIGHT CONTI-
NUITY
Using an ohmmeter, check that continuity exists between termi-
nals.
If continuity is not as specified, replace the light assembly or
bulb.
16. INSPECT LUGGAGE COMPARTMENT LIGHT CIR-
CUIT
Disconnect the connector from the light and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
1 ± Body groundConstantContinuity
If circuit is not as specified, inspect power source or wire har-
ness.

I04057
ONOFF
1 2
I04058
Wire Harness Side
12
I04059e±2±2±J
1 2
± BODY ELECTRICALINTERIOR LIGHT SYSTEM
BE±65
2366 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
17. INSPECT GLOVE COMPARTMENT DOOR COURTE-
SY SWITCH CONTINUITY
Switch positionTester connectionSpecified condition
OFF (closed)±No continuity
ON (opened)1 ± 2Continuity
If continuity is not as specified, replace the switch.
18. INSPECT GLOVE COMPARTMENT DOOR COURTE-
SY SWITCH CIRCUIT
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
2 ± GroundConstantContinuity
1 ± GroundLight control switch OFFNo voltage
1 ± GroundLight control switch TAIL or HEADBattery positive voltage
If circuit is not as specified, inspect power source or wire har-
ness.
19. INSPECT GLOVE COMPARTMENT LIGHT CONTINU-
ITY
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
I04060e±2±2±J
I04053
Wire Harness Side BE±66
± BODY ELECTRICALINTERIOR LIGHT SYSTEM
2367 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
20. INSPECT GLOVE COMPARTMENT LIGHT CIRCUIT
Disconnect the connector from the light and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
2 ± GroundGlove compartment door courtesy switch ONContinuity
1 ± GroundLIght control switch in TAIL or HEADBattery positive voltage
If circuit is not as specified, inspect power source or wire har-
ness.
21. INSPECT LICENCE PLATE LIGHT CONTINUITY
Using an ohmmeter, check that continuity exists between termi-
nals.
If continuity is not as specified, replace the light assembly or
bulb.
22. INSPECT LICENCE PLATE LIGHT CIRCUIT
Disconnect the connector from the light and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
1 ± GroundConstantContinuity
2 ± GroundLight control switch TAIL or HEADBattery positive voltage
If circuit is not as specified, inspect power source or wire har-
ness.

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.