Lexus GS300/400 (2000 year). Manual — part 76

BE–4

–

BODY ELECTRICAL

TROUBLESHOOTING

2305

”HI–Beam” does not light (One side).

1. Bulb

2. H–LP L–UPR Fuse

3. H–LP R–UPR Fuse

4. Wire Harness

–

BE–21

BE–21

–

”Flash” does not light.

1. H–LP L–UPR Fuse

2. H–LP R–UPR Fuse

3. Headlight Dimmer Switch

4. *Light Control ECU

5. Wire Harness

BE–21

BE–21

BE–37

–

–

”Flash” does not light.

1. Bulb

2. *Light Control ECU

3. Wire Harness

–

–

–

Headlight does not come on.

1. Headlight Control Relay

2. Light Control Switch

3. *Light Control ECU

4. Wire Harness

BE–37

BE–37

–

–

Headlight does not come on.

1. Bulb

2. *Light Control ECU

3. Wire Harness

–

–

–

Headlight flickers.

1. Bulb

2. *Light Control ECU

3. Wire Harness

–

–

–

Headlight is dark.

1. Bulb

2. *Light control ECU

3. Wire Harness

–

–

–

Only one taillight comes on.

1. Bulb

2. Wire Harness

–

–

Taillight does not come on.

(Headlight is normal)

1. TAIL Fuse

2. GAUGE Fuse

3. Taillight Control Relay

4. Light Failure Relay

5. Light Control Switch

6. Wire Harness

BE–21

BE–21

BE–37

BE–92

BE–37

–

Taillight does not come on.

(Headlight does not light)

1. Light Control Switch

2. Wire Harness

BE–37

–

Rear combination light does not come on.

1. Light Failure Relay

2. Wire Harness

3. Bulb

BE–92

–

–

*: HID Type

CANADA:

Symptom

Suspect Area

See page

Only one headlight comes on.

1. Daytime Running Light No.2, 3, 4 Relay

2. Daytime Running Light Main Relay

3. Bulb

4. *Light Control ECU

5. Wire Harness

BE–37

BE–37

–

–

–

”LO–Beam” does not light (All).

1. Headlight Control Relay

2. *Light Control ECU

3. Wire Harness

BE–37

–

–

”LO–Beam” does not light (One side).

1. Bulb

2. H–LP L–LWR Fuse

3. H–LP R–LWR Fuse

4. *Light Control ECU

5. Wire Harness

–

BE–21

BE–21

–

–

–

BODY ELECTRICAL

TROUBLESHOOTING

BE–5

2306

”HI–Beam” does not light (All).

1. Headlight Dimmer Switch

2. Daytime Running Light Main Relay

3. Wire Harness

BE–37

BE–37

–

”HI–Beam” does not light (One side).

1. Bulb

2. H–LP L–UPR Fuse

3. H–LP R–UPR Fuse

4. Daytime Running Light No.3 Relay

5. Wire Harness

–

BE–21

BE–21

BE–37

–

”Flash” does not light.

1. Headlight Dimmer Switch

2. Daytime Running Light Main Relay

3. Wire Harness

BE–37

BE–37

–

Headlight does not come on.

1. Headlight Control Relay

2. Daytime Running Light Main Relay

3. Daytime Running Light No.2, 3, 4 Relay

4. Headlight Dimmer Switch

5. Light Control Switch

6. Wire Harness

7. *Light Control ECU

8. Bulb

BE–37

BE–37

BE–37

BE–37

BE–37

–

–

–

Headlight does not come on with light control switch in HEAD.

1. Light Control Switch

2. *Light Control ECU

3. Wire Harness

BE–37

–

–

Headlight does not go out with light control switch in OFF.

1. Headlight Control Relay

2. *Light Control ECU

3. Wire Harness

BE–37

–

–

Headlight flickers.

1. Bulb

2. *Light Control ECU

3. Wire Harness

–

BE–37

–

Headlight is dark.

1. Bulb

2. *Light control ECU

3. Wire Harness

–

–

–

Taillight does not come on with light control switch in TAIL.

1. Taillight Control Relay (Instrument Panel J/B)

2. Light Control Switch

3. Wire Harness

BE–37

–

–

Taillight does not go out with light control switch in OFF.

1. Taillight Control Relay

2. Light Control Switch

3. Wire Harness

BE–37

BE–37

–

Headlight does not come on with engine running and light control

switch in OFF.

1. ECU–B Fuse

2. GAUGE Fuse

3. Daytime Running Light Main Relay

4. Daytime Running Light No.2, 3, 4 Relay

5. Generator L Terminal

6. Parking Brake Switch

7. Wire Harness

BE–21

BE–21

BE–37

BE–37

DI–853

BE–92

–

*: HID Type

BE–6

–

BODY ELECTRICAL

TROUBLESHOOTING

2307

HEADLIGHT BEAM LEVEL CONTROL SYSTEM

Symptom

Suspect Area

See page

Beam axis is not controlled. (It is not initialized.)

Headlight Beam Level Control System does not operate.

1. ECU–IG Fuse

2. Headight Beam Level Control Actuator

3. Headlight Beam Level Control ECU

4. Wire Harness Side

BE–21

BE–50

BE–50

–

Beam axis is not controlled. (It is initialized.)

Headlight Beam Level Control System does not operate.

1. Height Control Sensor

2. Headlight Beam Level Control ECU

3. Wire Harness Side

BE–50

BE–50

–

Controlled angle of head light is unusual.

(The angle is controlled.)

1. Height Control Sensor

2. Headlight Beam Level Control ECU

3. Headlights

4. Wire Harness Side

–

BE–50

BE–3

–

Beam axis position is not stable during driving.

1. ABS System

2. Headlights

3. Wire Harness

DI–387

BE–3

–

FOG LIGHT SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.

Symptom

Suspect Area

See page

Fog light does not light up with light control SW HEAD

(Headlight is normal.)

1. FOG Fuse

2. Fog Light Relay

3. Fog Light Switch

4. Wire Harness

5. Body No.2 ECU

BE–21

BE–53

BE–53

–

–

Fog light does not light up with light control SW HEAD

(Headlight does not light).

1.

*1

Other Parts

2. Wire Harness

–

–

Only one light does not light up.

1. Bulb

2. Wire Harness

–

–

*1: Inspect Headlight System
TURN SIGNAL AND HAZARD WARNING SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.

Symptom

Suspect Area

See page

”Hazard” and ”Turn” do not light up.

1. GAUGE Fuse

2. TURN HAZ Fuse

3. Ignitioin Switch

4. Turn Signal Flasher Relay

5. Wire Harness

BE–21

BE–21

BE–31

BE–56

–

Hazard warning light does not light up.

(Turn is normal)

1. Hazard Warning Switch

2. Wire Harness

BE–56

–

Turn signal does not light up.

(Hazard is normal)

1. Turn Signal Switch

2. Wire Harness

BE–56

–

Turn signal does not light up in one direction.

1. Turn Signal Switch

2. Wire Harness

BE–56

–

Only one bulb does not light up.

1. Bulb

2. Wire Harness

–

–

–

BODY ELECTRICAL

TROUBLESHOOTING

BE–7

2308

INTERIOR LIGHT SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.

Symptom

Suspect Area

See page

All the lights do not come ON.

1. DOME Fuse

2. Body ECU NO.2

BE–21

–

The light does not come ON when the driver’s door is opened.

1. Driver’s Door Courtesy Switch

2. Wire Harness

BE–60

–

The light does not come ON when the passenger’s door is

opened.

1. Passenger’s Door Courtesy Switch

2. Wire Harness

BE–60

–

The light does not come on when the rear–right door is opened.

1. Rear–Right Door Courtesy Switch

2. Wire Harness

BE–60

–

The light does not come on when the rear–left door is opened.

1. Rear–Left Door Courtesy Switch

2. Wire Harness

BE–60

–

Only one of the bulbs comes ON.

Bulb

–

The illumination does not fade out when all the doors are closed.

1. Courtesy Switch

2. Wire Harness

BE–60

–

The illumination does not fade out immediately when the ignition

switch is turned to ACC or ON within 15 seconds after all the

doors are closed.

1. Ignition Switch

2. RADIO NO.2 Fuse

3. GAUGE Fuse

4. Wire Harness

BE–31

BE–21

BE–21

–

The illumination does not fade out immediately when all the doors

are locked within 15 seconds after they are closed.

1. Door Unlock Detection Switch

2. Wire Harness

BE–131

–

Interior light does not light up.

(in front personal light)

1. Bulb

2. Front Personal Light

3. Wire Harness

–

BE–60

–

Front personal light does not light up.

1. Bulb

2. Front Personal Light

3. Wire Harness

–

BE–60

–

Rear personal light does not light up.

1. Bulb

2. Rear Personal Light

3. Wire Harness

–

BE–60

–

Vanity light does not light up.

1. Bulb

2. Vanity Light

3. Wire Harness

–

BE–60

–

Luggage compartment light does not light up.

1. Bulb

2. Luggage Compartment Door Courtesy Switch

3. Wire Harness

–

BE–60

–

Courtesy light does not light up.

1. Bulb

2. Door Courtesy Switch

3. Wire Harness

–

BE–60

–