light LEXUS GS400 2000 Service Owners Manual

I04253

Meter Circuit Plate ± 2
Combination Meter ECU
SLIP Indicator
TRAC OFF Indicator
Window Washer Level Warning
ABS Warning
VSC Warning
Brake Fluid Level Warning
ECT SNOW Indicator
Low Oil Pressure Warning
ECT PWR Indicator
Discharge Warning
CRUISE MAIN Indicator
Seat Belt Warning
Rear Light Indicator
Headlight Leveling Indicator
SRS Warning
Open Door Warning
Fog Light IndicatorA/T 2 Indicaor
Engine Oil Level Indicator
Malfunction Indicator
Fuel Level Indicator
Headlight Indicator (USA)
Taillight Indicator (CANADA) ODO/
TRIP
Display
PanelIG+
SLIP
TRC OFF
WASHER
ABS
VSC
BRAKE
ECT SNOW
OIL P
ECT PWR
CHARGE
CRUISE
SEAT BELT
Rr LIGHT
HEAD LVL
AIRBAG
SRS +B
DOOR
FR FOG
COM1
SEG30
TEST1
TEST2
TEST3
GroundCHECK
ENG
IG+
FUEL
IG+
BEAM±
BEAM+ SRS +BTAIL A/T R
A/T L
A/T N
A/T D
OIL LVLDIM+
A/T 2
A/T 3
A/T 4F12
A/T PF11
F10
F9
F8
F5
F4
F2
F1
C7
C5
C3
D12
D8 E11
E10
E9
E8
E7
E6
J1
J33
D6
D4Hi±Beam Indicator
D2 E20
E19
E18
E17
E16
E15
E14
E13
E12
E3
E1 E5
E4A/T 3 Indicaor
A/T 4 Indicaor
A/T P Indicaor
A/T R Indicaor
A/T L Indicaor
A/T N Indicaor
A/T D Indicaor
T1
T2
T3
T4
~~
D10 BE±88
± BODY ELECTRICALCOMBINATION METER
2389 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

BE0HJ±08
I04254
Meter Glass Decoration Plate Fuel Receiver Gauge
and Engine Coolant
Temperature Gauge SpeedometerTachometer
Cold Cathode Tube with PlateMeter Body ECU Plate Meter Cover
Buzzer
Telltale Light Assembly Connector
Clips
± BODY ELECTRICALCOMBINATION METER
BE±89
2390 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
COMPONENTS

BE0HK±04
I04255
I04256
I04257
I04258
BE±90
± BODY ELECTRICALCOMBINATION METER
2391 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
DISASSEMBLY
1. DISCONNECT TELLTALE LIGHT ASSEMBLY CON-
NECTOR
2. REMOVE METER COVER
(a) Disengage a claw.
(b) Remove the 4 screws and the meter cover.
3. REMOVE ECU PLATE
(a) Disconnect the 4 flat circuit plates.
(b) Remove the 16 clips and the ECU plate.
4. REMOVE BUZZER

I04078
Connector ºBº Connector ºAº
BE0HL±03
BE±92
± BODY ELECTRICALCOMBINATION METER
2393 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT COMBINATION METER CIRCUIT
Connector disconnected:
Disconnect connector ºAº and ºBº from the combination meter
and inspect the connectors on the wire harness side as shown
in the table.
Tester connectionConditionSpecified condition
A1 ± GroundIgnition switch ONBattery positive voltage
A3 ± A4ConstantContinuity
A7 ± GroundLight control switch HEAD and headlight dimmer
switch HIContinuity
A8 ± Ground
B22 ± GroundConstantContinuity
A10 ± GroundWindow washer level warning switch Float downContinuity
B1 ± GroundIgnition switch ONBattery positive voltage
B4 ± B6ConstantApprox. 10 kW
B13 ± GroundConstantBattery positive voltage
B14 ± GroundConstantBattery positive voltage
B15 ± GroundLight control switch in HEADBattery positive voltage
If circuit is not as specified, wiring diagram and inspect the cir-
cuits connected to other parts.

I04079
Connector ºCº Connector ºDº
Connector ºFº Connector ºEº
Connector ºGº
1 131 13
1 201 12
± BODY ELECTRICALCOMBINATION METER
BE±93
2394 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
2. INSPECT COMBINATION METER CIRCUIT PLATE
Warning light circuit plate:
(a) Remove meter cover.
(b) Disconnect connectors ºCº, ºDº, ºEº, ºFº and ºGº from the
meter circuit plate and inspect the connectors on the wire
harness side as shown in the table.
Tester connectionCheck indicator lightSpecified condition
D10 (+) ± D12 (±)Fuel level warning lightContinuity
D6 (+) ± D8 (±)Headlight indiactor light (USA)
Taillight indiactor light (CANADA)Continuity
D2 (+) ± D4 (±)Hi±beam indicator lightContinuity
C3 (+) ± C7 (±)Engine oil level warning lightContinuity
C3 (+) ± C5 (±)Malfunction indicator lightContinuity
E19 (±) ± E20 (+)Slip warning lightContinuity
E18 (±) ± E20 (+)TRAC OFF indicator lightContinuity
E17 (±) ± E20 (+)Window washer level warning lightContinuity
E16 (±) ± E20 (+)ABS warning lightContinuity
E15 (±) ± E20 (+)VSC OFF indicator lightContinuity
E14 (±) ± E20 (+)Brake warning lightContinuity
E13 (±) ± E20 (+)ECT SNOW indicator lightContinuity
E12 (±) ± E20 (+)Low oil pressure warning lightContinuity
E11 (±) ± E20 (+)ECT PWR indicator lightContinuity
E10 (±) ± E20 (+)Discharge warning lightContinuity
E9 (±) ± E20 (+)CRUISE MAIN indicator lightContinuity
E8 (±) ± E20 (+)Seat belt warning lightContinuity
E7 (±) ± E20 (+)Rear Lights warning lightContinuity
E6 (±) ± E20 (+)Headlight leveling indiactorContinuity
E4 (+) ± E5 (±)SRS warning lightContinuity
E3 (±) ± E4 (+)Open door warning lightContinuity
F4 (±) ± F12 (+)A/T shift indicator light (L)Continuity
F11 (±) ± F12 (+)A/T shift indicator light (2)Continuity
F10 (±) ± F12 (+)A/T shift indicator light (3)Continuity
F8 (±) ± F12 (+)A/T shift indicator light (P)Continuity

I04080
Connector
ºOº, ºPº, ºQº, ºRº BE±94
± BODY ELECTRICALCOMBINATION METER
2395 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)F5 (±) ± F12 (+)
A/T shift indicator light (R)Continuity
F2 (±) ± F12 (+)A/T shift indicator light (N)Continuity
F1 (±) ± F12 (+)A/T shift indicator light (D)Continuity
G1 (+) ± G5 (±)Left turn signal indicator lightContinuity
G6 (+) ± G5 (±)Right turn signal indicator lightContinuity
If circuit is not as specified, replace the bulb or circuit plate.
3. INSPECT COMBINATION METER CIRCUIT PLATE
From combination meter ECU to gauges:
TerminalResistance (W)
O1 ± O3
(Engine coolant temperature receiver gauge)Approx. 164.2
O2 ± O4
(Engine coolant temperature receiver gauge)Approx. 151.8
P1 ± P4 (Tachometer)Approx. 164.2
P2 ± P3 (Tachometer)Approx. 151.8
Q1 ± Q4 (Speedometer)Approx. 164.2
Q2 ± Q3 (Speedometer)Approx. 151.8
R1 ± R4 (Fuel receiver gauge)Approx. 164.2
R2 ± R3 (Fuel receiver gauge)Approx. 151.8
If circuit is not as specified, inspect the gauge or meter.
Then recheck system.
If circuit is not as specified, replace the circuit plate.

I04081
Connector ºGº
Connector ºUº
I04082
± BODY ELECTRICALCOMBINATION METER
BE±95
2396 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
4. INSPECT COMBINATION METER CIRCUIT PLATE
From combination meter ECU to telltale light assem-
bly:
Disconnect connector ºGº and ºUº from the meter circuit plate
and inspect the connectors on the wire harness side as follows.
Tester connectionSpecified condition
G1 ± U9Continuity
G3 ± U1Continuity
G5 ± U10Continuity
G6 ± U4Continuity
G7 ± U3Continuity
G8 ± U8Continuity
If circuit is not as specified, replace the circuit plate.
5. INSPECT TELLTALE LIGHT ASSEMBLY CONTINUITY
Switch positionTester connectionCondition
ODO/ TRIP switch Free3 ± 10No continuity
ODO/ TRIP switch
Pushed in3 ± 10Continuity
RESET switch Free8 ± 10No continuity
RESET switch Pushed in8 ± 10Continuity
Turn signal switch RIGHT4 ± 10Continuity
Turn signal switch LEFT9 ± 10Continuity
If continuity is not as specified, replace the telltale light assem-
bly.

I04091
F
E1
2
1/2
I04094
A
D
C
B
I01277
Battery Ignition
SwitchWarning Light
Wire Harness Side
1 BE±98
± BODY ELECTRICALCOMBINATION METER
2399 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
13. INSPECT FUEL SUB SENDER GAUGE RESISTANCE
Measure the resistance between terminals 1 and 2 for each
float position.
Float position mm (in.)Resistance (W)
F: Approx. 9.5 (0.37) ± 3 (0.12)Approx. 2.0 ± 1.0
1/2: Approx. 110.5 (4.35) ± 3 (0.12)Approx. 33.0 ± 3.0
E: Approx. 206.5 (8.13) ± 3 (0.12)Approx. 61.3 ± 1.0
If resistance value is not as specified, replace the sub sender
gauge.
14. INSPECT ENGINE COOLANT TEMPERATURE RE-
CEIVER GAUGE OPERATION (See page DI±754)
15. INSPECT ENGINE COOLANT TEMPERATURE RE-
CEIVER GAUGE RESISTANCE
Measure the resistance between terminals with fixing pointer to
the stopper.
Tester connectionResistance (W)
A ± B140 ± 185
C ± D130 ± 175
If resistance value is not as specified, replace the receiver
gauge.
HINT:
This circuit includes the diode.
If resistance value is not as specified, replace the receiver
gauge.
16. INSPECT LOW OIL PRESSURE WARNING LIGHT
(a) Disconnect the connector from the warning switch and
ground terminal on the wire harness side connector.
(b) Turn the ignition switch ON and check that the warning
light lights up.
If the warning light does not light up, test the bulb.

I01278
I01279
Battery Ignition
SwitchWarning Light
I04095
OFF
ON
I04096
± BODY ELECTRICALCOMBINATION METER
BE±99
2400 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
17. INSPECT LOW OIL PRESSURE SWITCH CONTINUITY
(a) Disconnect the connector from the switch.
(b) Check that continuity exists between terminal and ground
with the engine stopped.
(c) Check that no continuity exists between terminal and
ground with the engine running.
HINT:
Oil pressure should be over 24.5 kPa (0.25 kgf/cm
2, 3.55 psi).
If operation is not as specified, replace the switch.
18. INSPECT BRAKE WARNING LIGHT
(a) Disconnect the connector from the brake fluid warning
switch.
(b) Release the parking brake pedal.
(c) Connect the terminals on the wire harness side of the lev-
el warning switch connector.
(d) Start the engine, check that the warning light lights up.
If the warning light does not light up, test the bulb or wire har-
ness.
19. INSPECT BRAKE FLUID LEVEL WARNING SWITCH
CONTINUITY
(a) Remove the reservoir tank cap and strainer.
(b) Disconnect the connector.
(c) Check that no continuity exists between the terminals with
the switch OFF (float up).
(d) Use siphon, etc. to take fluid out of the reservoir tank.
(e) Check that continuity exists between the terminals with
the switch ON (float down)
(f) Pour the fluid back in the reservoir tank.
If operation is not as specified, replace the switch.
20. INSPECT BRAKE FLUID LEVEL WARNING SWITCH
CIRCUIT (See page DI±835)
21. INSPECT PARKING BRAKE SWITCH CONTINUITY
(a) Check that continuity exists between the terminal and
switch body with the switch ON (switch pin released).
(b) Check that no continuity exists between the terminal and
switch body with the switch OFF (switch pin pushed in).
If operation is not as specified, replace the switch or inspect
ground point.
22. INSPECT PARKING BRAKE SWITCH CIRCUIT
(See page DI±796)

I04097
Battery Ignition
SwitchWarning Light
Wire Harness Side
I04098
Wire Harness Side
I04099
BatteryIgnition
SwitchWarning Light
Wire Harness Side BE±100
± BODY ELECTRICALCOMBINATION METER
2401 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
23. INSPECT REAR LIGHTS WARNING LIGHT
(See page DI±841)
(a) Disconnect the connector from the light failure sensor and
ground terminal 3 on the wire harness side connector.
(b) Start the engine, check that the warning light lights up.
If the warning light does not light up, inspect the bulb or wire har-
ness.
24. INSPECT LIGHT FAILURE SENSOR CIRCUIT
Disconnect connector from the light failure sensor and inspect
the connectors on the wire harness side as follows.
Tester connectionConditionSpecified condition
1 ± GroundConstantContinuity *
2 ± GroundConstantContinuity *
6 ± GroundConstantContinuity *
7 ± GroundConstantContinuity *
11 ± GroundConstantContinuity
12 ± GroundConstantContinuity *
5 ± GroundLight control switch OFFNo voltage
5 ± GroundLight control switch in TAIL or HEADBattery positive voltage
8 ± GroundIgnition switch in LOCK or ACCNo voltage
8 ± GroundIgnition switch ONBattery positive voltage
9, 10 ± GroundStop light switch OFFNo voltage
9, 10 ± GroundStop light switch ONBattery positive voltage
*: There is resistance because this circuit is grounded through
the bulb.
If circuit is as specified, replace the relay.
If circuit is not as specified, wiring diagram and inspect the cir-
cuits connected to other parts.
25. INSPECT ENGINE OIL LEVEL WARNING LIGHT
(a) Disconnect the connector from the switch.
(b) Run the engine.
(c) Turn the ignition switch ON, check that the warning light
lights up approximatery 40 seconds later.
If the warning light does not light up, inspect bulb or wire har-
ness.