Lexus GS300/400 (2000 year). Service manual - part 85

I04035

From Back Side

11

I01200

2

1

3

5

2

5

1

3

BE–54

–

BODY ELECTRICAL

FOG LIGHT SYSTEM

2355

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 connection

Condition

Specified condition

11 – Ground

Light control switch HEAD and headlight dimmer

switch LO and fog light switch ON

No voltage

11 – Ground

Light control switch HEAD and headlight dimmer

switch HI or FLASH and fog light switch ON

Battery positive voltage

If circuit is not as specified, inspect the wire harness.

4.

INSPECT FOG LIGHT RELAY CONTINUITY

Condition

Tester connection

Specified condition

Constant

1 – 2

Continuity

Apply  B+ between

terminals 1 and 2.

3 – 5

Continuity

If continuity is not as specified, replace the relay.
5.

INSPECT FOG LIGHT RELAY CIRCUIT 
(See page 

BE–21

)

BE0H0–06

I01353

Turn Signal Lights

Engine 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 Fuse

Cowl Side No.5
Junction Block

 Turn Signal Flaher

–

BODY ELECTRICAL

TURN SIGNAL AND HAZARD WARNING SYSTEM

BE–55

2356

TURN SIGNAL AND HAZARD WARNING SYSTEM

LOCATION



The vehicle shown in this illustration is ”GS400”.



All components of ”GS300” other than the ones used for engine are same as ”GS400”.

BE0H1–02

I04043

Right turn

Left turn

I04034

Wire Harness Side

2

BE–56

–

BODY ELECTRICAL

TURN SIGNAL AND HAZARD WARNING SYSTEM

2357

INSPECTION

1.

INSPECT TURN SIGNAL SWITCH CONTINUITY

Switch position

Tester connection

Specified  condition

Left turn

1 – 2

Continuity

Neutral

–

No continuity

Right turn

2 – 3

Continuity

If continuity is not as specified, replace the switch.

2.

INSPECT TURN SIGNAL SWITCH CIRCUIT
Connector disconnected:

Disconnect the connector from the combination switch and in-
spect the connector on the wire harness side, as shown.

Tester connection

Condition

Specified condition

2 – Ground

Constant

Continuity

If circuit is not as specified, inspect the wire harness.

I04035

From Back Side

1

2

3

I04044

I04045

Wire Harness Side

–

BODY ELECTRICAL

TURN SIGNAL AND HAZARD WARNING SYSTEM

BE–57

2358

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 connection

Condition

Specified condition

2 – Ground

Ignition switch ON and turn signal switch Neutral

No voltage

1 – Ground

Ignition switch ON and turn signal switch Left

Battery positive voltage 

↔

 0 V

3 – Ground

Ignition switch ON and turn signal switch Right

Battery positive voltage 

↔

 0 V

If circuit is not as specified, inspect the circuits connected to oth-
er parts.

4.

INSPECT HAZARD WARNING SWITCH CONTINUITY

Switch position

Tester connection

Specified condition

Switch OFF

7 – 10

Continuity

Switch ON

7 – 8

Continuity

Illumination circuit

2 – 3

Continuity

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 connection

Condition

Specified condition

8 – Ground

Constant

Continuity

If circuit is not as specified, inspect the circuits connected to oth-
er parts.