battery LEXUS GS400 2000 Service Manual Online

I01254
Wire Harness Side
4 3 2 1
± BODY ELECTRICALHEADLIGHT AND TAILLIGHT SYSTEM
BE±43
2344 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
19. INSPECT LIGHTS±ON CONDITION
(a) Open the driver's door while the ignition switch is OFF.
(b) Turn the light control switch to AUTO leaving the door
open and cover the top of the sensor, and verify that the
lights go on when the ignition switch is turned ON.
20. INSPECT AUTOMATIC LIGHT CONTROL SENSOR
CIRCUIT
Connector disconnected:
Disconnect the connector from the sensor and inspect the con-
nector on the wire harness side, as shown in the table.
Tester connectionConditionSpecified condition
3 ± GroundConstantContinuity
1 ± GroundIgnition switch LOCK or ACCNo voltage
1 ± GroundIgnition switch ONBattery positive voltage
4 ± GroundIgnition switch LOCK or ACCNo voltage
4 ± GroundIgnition switch ON5.2 ± 9.0 V
If circuit is as specified, perform the inspection on the following
page.
If the circuit is not as specified, inspect the circuit connected to
other parts.

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.

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)

I04035
From Back Side
1 2 3
I04044
I04045
Wire Harness Side
± BODY ELECTRICALTURN SIGNAL AND HAZARD WARNING SYSTEM
BE±57
2358 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
3. INSPECT TURN SIGNAL SWITCH CIRCUIT
Connector connected:
Connect the wire harness side connector to the combination
switch and inspect the connector form the back side, as shown.
Tester connectionConditionSpecified condition
2 ± GroundIgnition switch ON and turn signal switch NeutralNo voltage
1 ± GroundIgnition switch ON and turn signal switch LeftBattery positive voltage e 0 V
3 ± GroundIgnition switch ON and turn signal switch RightBattery positive voltage e 0 V
If circuit is not as specified, inspect the circuits connected to oth-
er parts.
4. INSPECT HAZARD WARNING SWITCH CONTINUITY
Switch positionTester connectionSpecified condition
Switch OFF7 ± 10Continuity
Switch ON7 ± 8Continuity
Illumination circuit2 ± 3Continuity
If continuity is not as specified, replace the switch.
5. INSPECT HAZARD WARNING SWITCH CIRCUIT
(See page DI±814)
Disconnect the switch connector and inspect the connection on
the wire harness side, as shown.
Tester connectionConditionSpecified condition
8 ± GroundConstantContinuity
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

I04046
Wire Harness Side BE±58
± BODY ELECTRICALTURN SIGNAL AND HAZARD WARNING SYSTEM
2359 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
6. INSPECT TURN SIGNAL FLASHER CIRCUIT
Disconnect the connector from the combination switch and in-
spect the connector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
2 ± GroundConstantContinuity
3 ± GroundConstantContinuity
5 ± GroundTurn signal switch RIGHT or OFFNo continuity
5 ± GroundTurn signal switch LEFTContinuity
6 ± GroundTurn signal switch LEFT or OFFNo continuity
6 ± GroundTurn signal switch RIGHTContinuity
7 ± GroundConstantContinuity
8 ± GroundHazard warning switch OFFNo continuity
8 ± GroundHazard warning switch ONContinuity
1 ± GroundIgnition switch LOCK or ACCNo voltage
1 ± GroundIgnition switch ONBattery positive voltage
4 ± GroundConstantBattery positive voltage
If circuit is as specified, replace the relay.
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

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.

I04051
Wire Harness Side
I04061
Open Close
1 2
BE±62
± BODY ELECTRICALINTERIOR LIGHT SYSTEM
2363 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
6. INSPECT VANITY 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
1 ± GroundConstantBattery positive voltage
If circuit is not as specified, inspect power source or wire har-
ness.
7. Front door:
INSPECT DOOR COURTESY SWITCH CONTINUITY
(a) Connect the connector to the front 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.
8. Front door:
INSPECT DOOR COURTESY SWITCH CIRCUIT
Driver side: (See page DI±868)
Passenger side: (See page DI±900)

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.