Lexus LS400 (2000 year). Service manual — part 48
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BODY ELECTRICAL
TROUBLESHOOTING
BE–7
1870
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. PWR–IG Fuse (Engine Room J/B)
2. Headlight Beam Level Control Actuator
3. Headlight Beam Level Control ECU
4. Wire Harness Side
Beam axis is not controlled. (It is initialized.)
Headlight Beam Level Control System does not operate.
1. Headlight Beam Level Control ECU
2. Power Source Circuit
3. Height Control Sensor
4. Suspension ECU
5. Headlight Beam Level Control ECU
6. Wire Harness Side
Controlled angle of head light is nnusual. (The angle is controlled.)
1. Height Control Sensor
2. Suspension ECU
3. Headlights
4. Wire Harness Side
Beam axis position is not stable during driving.
1. ABS System
2. Headlights
3. Wire Harness Side
FOG LIGHT SYSTEM
Symptom
Suspect Area
See page
Fog light does not light up with light control SW HEAD
(Headlight is normal.)
1. FOG Fuse (Instrument Panel J/B)
2. Fog Light Relay (Instrument Panel J/B)
3. Fog Light Switch
4. Wire Harness
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
Symptom
Suspect Area
See page
”Hazard” and ”Turn” do not light up.
1. Hazard Warning Switch
2. Turn Signal Switch
3. Turn Signal Flasher
4. Wire Harness
The flashing frequency is abnormal.
1. Bulb
2. Turn Signal Switch
3. Wire Harness
Hazard warning light does not light up.
(Turn is normal)
1. HAZ Fuse (Engine Room J/B)
2. Wire Harness
Hazard warning light does not light up in one direction.
1. Hazard Warning Switch
2. Wire Harness
*
1
Turn signal does not light up.
1. Ignition Switch
2. TURN Fuse (Instrument Panel J/B)
3. Turn Signal Switch
4. Wire Harness
*
2
Turn signal does not light up.
1. TURN Fuse (Instrument Panel J/B)
2. Turn Signal Switch
3. Wire Harness
BE–8
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BODY ELECTRICAL
TROUBLESHOOTING
1871
Turn signal does not light up in one direction.
1. Turn Signal Switch
2. Wire Harness
Only one bulb does not light up.
1. Bulb
2. Wire Harness
*
1
: Combination Meter, Wiper and Washer do not operate.
*
2
: Combination Meter, Wiper and Washer are normal.
ILLUMINATION 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
Illumination light do not light.
(Taillight is normal)
1. PANEL Fuse (Instrument Panel J/B)
2. Rheostat Light Control
3. Wire Harness
Illumination light do not light.
(Taillight does not light)
1. Taillight Control Relay (Instrument Panel J/B)
2. Taillight System
3. Rheostat Light Control
4. Wire Harness
5. PANEL Fuse (Instrument Panel J/B)
Only one light does not light.
1. Bulb
2. Wire Harness
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 (Engine Room J/B)
2. DOME Fuse (Engine Room J/B)
3. Body ECU
The light does not come ON when the driver’s door is opened.
1. Driver’s Door Courtesy Switch
2. Driver Door ECU
3. Multiplex Communication Circuit
4. Body ECU
5. Wire Harness
The light does not come ON when the passenger’s door is
opened.
1. Passenger’s Door Courtesy Switch
2. Front Passenger Door ECU
3. Multiplex Communication Circuit
4. Body ECU
5. Wire Harness
The light does not come on when the rear–right door is opened.
1. Rear–Right Door Courtesy Switch
2. Body ECU
3. Wire Harness
The light does not come on when the rear–left door is opened.
1. Rear–Left Door Courtesy Switch
2. Body ECU
3. Wire Harness
Only one of the bulbs comes ON.
1. Bulb
The illumination does not fade out when all the doors are closed.
1. Courtesy Switch
2. Driver Door ECU
3. Front Passenger Door ECU
4. Multiplex Communication Circuit
5. Body ECU
6. Wire Harness
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BODY ELECTRICAL
TROUBLESHOOTING
BE–9
1872
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 (Instrument Panel J/B)
3. GAUGE Fuse (Instrument Panel J/B)
4. Body ECU
5. Wire Harness
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. Driver Door ECU
3. Front Passenger Door ECU
4. Multiplex Communication Circuit
5. Body ECU
6. Wire Harness
Interior light does not light up.
(in front personal light)
1. Bulb
2. Front Personal Light
3. Wire Harness
Front personal light does not light up.
1. Bulb
2. Front Personal Light
3. Wire Harness
Rear personal light does not light up.
1. Bulb
2. Rear Personal Light
3. Wire Harness
Vanity light does not light up.
1. Bulb
2. Vanity Light
3. Wire Harness
Luggage compartment light does not light up.
1. Bulb
2. Luggage Compartment Door Courtesy Switch
3. Wire Harness
Courtesy light does not light up.
1. Bulb
2. Door Courtesy Switch
3. Wire Harness
STOP LIGHT SYSTEM
Symptom
Suspect Area
See page
Stop light does not light up.
1. STOP Fuse (Instrument Panel J/B)
2. Stop Light Switch
3. Light Failure Sensor
4. Wire Harness
Stop light always lights up.
1. Stop Light Switch
2. Wire Harness
Only one light always lights up.
1. Wire Harness
Only one light does not light up.
1. Bulb
2. Wire Harness
HEADLIGHT CLEANER SYSTEM
Symptom
Suspect Area
See page
”Headlight Cleaner System” does not operate
(Using light control switch)
1. Light control switch
2. Wire Harness
”Headlight Cleaner System” does not operate
(When operating ”Running Light System”)
1. Daytime Running Light Relay (Main)
2. Wire Harness
BE–10
–
BODY ELECTRICAL
TROUBLESHOOTING
1873
”Headlight Cleaner System” does not operate
(All)
1. AM1 H–Fuse
2. WIPER Fuse
3. Ignition Switch
4. Headlight Cleaner Switch
5. Headlight Cleaner Relay
6. Headlight Cleaner Motor
7. Headlight Cleaner Nozzle and Hose
8. Wire Harness
Washer fluid does not spray
1. Headlight Cleaner Nozzle and Hose
WIPER AND WASHER 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
Wiper and washers do not operate.
1. WIPER Fuse (Instrument Panel J/B)
2. Wiper Switch
3. Wiper Motor
4. Body ECU
5. Wire Harness
Wipers do not operate in LO, HI or MIST.
1. Wiper Switch
2. Wiper Motor
3. Wire Harness
Wipers do not operate in INT.
1. Wiper Switch
2. Wiper Motor
3. Body ECU
4. Wire Harness
Washer motor does not operate.
1. Washer Switch
2. Washer Motor
3. Wire Harness
Wipers do not operate when washer switch in ON.
1. Washer Motor
2. Body ECU
3. Wire Harness
Washer fluid does not operate.
1. Washer Hose and Nozzle
When wiper switch is at HI position, the wiper blade is in
contact with the body.
When the wiper switch is OFF, the wiper blade does not
retract or the retract position wrong.
1. Wiper Motor *
2. Wire harness *
3. Body ECU
*: Inspect wiper arm and blade set position.
COMBINATION METER
Symptom
Suspect Area
See page
SRS warning light does not light up.
1. MPX–B Fuse
2. Bulb
3. Meter Circuit Plate
4. Wire Harness
5. Airbag Sensor Assembly
Hi–beam indicator light does not light up.
1. Bulb
2. Meter Circuit Plate
3. Wire Harness
4. Headlight System
Turn indicator light does not light up.
1. Bulb
2. Meter Circuit Plate
3. Wire Harness
4. Turn Signal and Hazard Warning System
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