battery LEXUS GS400 2000 Service Owners Manual

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.

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.

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.

I04072
4 3
I04073
54
I04074
1
54 2
I04076
Wire Harness Side BE±78
± BODY ELECTRICALWIPER AND WASHER SYSTEM
2379 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
4. INSPECT WIPER MOTOR OPERATION
High speed:
Connect the positive (+) lead from the battery to terminal 3 and
the negative (±) lead to terminal 4, check that the motor oper-
ates 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 5.
(b) Connect terminals 1 and 5.
(c) Connect the positive (+) lead from the battery to terminal
2 and negative (±) lead to terminal 4, check that the motor
stops running at the stop position after the motor operates
again.
If operation is not as specified, replace the motor.
6. INSPECT WIPER MOTOR CIRCUIT
Connector disconnected:
Disconnect the connector from the motor and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
4 ± GroundConstantContinuity
2 ± GroundIgnition switch LOCK or ACCNo voltage
2 ± GroundIgnition switch ONBattery positive voltage
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

I01272
2
1
I04077
Wire Harness Side
± BODY ELECTRICALWIPER AND WASHER SYSTEM
BE±79
2380 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
7. INSPECT WASHER MOTOR OPERATION
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.
8. INSPECT WASHER MOTOR 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 ± GroundIgnition switch ONBattery positive voltage
If circuit is not as specified, inspect the power source, wire har-
ness and wiper switch.

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.

I04085
AD
C
B
I04086
Fuel Receiver Gauge
Battery Ignition
Switch
Main
Sender
Gauge Wire Harness
Side
I04087
Battery Ignition
SwitchFuel Receiver Gauge
Wire Harness
SideSub
Sender
Gauge12
I04089
AD
C
B
I04090
F
1/2
E32
± BODY ELECTRICALCOMBINATION METER
BE±97
2398 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
9. INSPECT TACHOMETER 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 meter.
10. INSPECT FUEL RECEIVER GAUGE OPERATION
(See page DI±752)
(a) Disconnect the connector from the main sender gauge.
(b) Turn the ignition switch ON, check that the receiver gauge
needle indicates EMPTY.
(c) Connect the main sender gauge.
(d) Disconnect the connector from the sub sender gauge.
(e) Turn the ignition switch ON, check that the receiver gauge
needle indicates EMPTY.
HINT:
Because of the silicon oil in the gauge, it will take a short time
for needle to stabilize.
If operation is not as specified, inspect the receiver gauge resis-
tance.
11. INSPECT FUEL RECEIVER 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.
12. INSPECT FUEL MAIN SENDER GAUGE RESISTANCE
Measure the resistance between terminals 1 and 2 for each
float position.
Float position mm (in.)Resistance (W)
F: Approx. 34.6 (1.36) ± 3 (0.12)Approx. 2.0 ± 1.0
1/2: Approx. 52.4 (2.06) ± 3 (0.12)Approx. 26.1 ± 3.0
E: Approx. 134.9 (5.31) ± 3 (0.12)Approx. 48.7 ± 1.0
If resistance value is not as specified, replace the main sender
gauge.

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)