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Home >> Lexus >> 2005 >> LX 470 >> Repair and Diagnosis >> Electrical >> Body Electrical >> Troubleshooting (Electrical) >> Problem Symptoms Table

Problem Symptoms Table

IGNITION SWITCH AND KEY UNLOCK WARNING SWITCH: 

This system uses the body control system, so check the body control system before you proceed with troubleshooting (See HOW TO PROCEED WITH TROUBLESHOOTING ).

PROBLEM SYMPTOMS TABLE - IGNITION SWITCH AND KEY UNLOCK WARNING SWITCH

Symptom Suspect Area
Ignition switch is not set to each position.
  • 6. Ignition switch
  • 7. Power source circuit
Ignition key illumination does not comes on.
  1. Transponder key amplifier with coil
  2. Wire Harness
  3. Body ECU (Main)
Key unlock warning system does not operate. (The buzzer does not sound when the driver's door is opened with the ignition OFF and key inserted)
  1. Key Unlock Warning Switch
  2. Door Courtesy Switch
  3. Wire Harness
Key unlock warning system does not operate. (The buzzer sounds when the ignition key is in ACC or ON)
  1. Ignition Switch
  2. Wire Harness

HEADLIGHT AND TAILLIGHT SYSTEM: 

This system uses the body control system, so check the body control system before you proceed with troubleshooting (See HOW TO PROCEED WITH TROUBLESHOOTING ).

Fig 1: Headlight And Taillight System - Problem Symptoms Table (1 Of 2)
G02994130Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Headlight And Taillight System - Problem Symptoms Table (2 Of 2)
G02994131Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

FOG LIGHT SYSTEM: 

PROBLEM SYMPTOMS TABLE - FOG LIGHT SYSTEM

Symptom Suspect Area
Fog light does not come on with light control SW HEAD (Headlight is normal).
  1. FOG Fuse
  2. Fog Light Switch
  3. Engine Room J/B Relay Circuit
  4. Wire Harness
Fog light does not come on with light control SW HEAD (Headlight does not light).
  1. (1) Other Parts
  2. Wire Harness
Only one light does not come on.
  1. Bulb
  2. Wire Harness
(1) Inspect Headlight System

TURN SIGNAL AND HAZARD WARNING SYSTEM: 

PROBLEM SYMPTOMS TABLE - TURN SIGNAL AND HAZARD WARNING SYSTEM

Symptom Suspect Area
"Hazard" and "Turn" do not come on.
  1. ECU-IG2 Fuse
  2. TURN HAZ Fuse
  3. Ignition Switch
  4. Turn Signal Flasher Relay
  5. Wire Harness
Hazard warning light does not come on. (Turn is normal)
  1. Hazard Warning Switch
  2. Wire Harness
Turn signal does not come on. (Hazard is normal)
  1. Turn Signal Switch
  2. Wire Harness
Turn signal does not come on in one direction.
  1. Turn Signal Switch
  2. Wire Harness
Only one bulb does not come on.
  1. Bulb
  2. Wire Harness

INTERIOR LIGHT SYSTEM: 

This system uses the body control system, so check the body control system before you proceed with troubleshooting (See HOW TO PROCEED WITH TROUBLESHOOTING ).

PROBLEM SYMPTOMS TABLE - INTERIOR LIGHT SYSTEM

Symptom Suspect Area
All the lights do not come ON.
  1. DOME Fuse
  2. DOME Relay (Cowl Side J/B LH)
  3. Body ECU (Main)
The light does not come ON when the driver's door is opened.
  1. Driver's Door Courtesy Switch
  2. Wire Harness
The light does not come ON when the passenger's door is opened.
  1. Passenger's Door Courtesy Switch
  2. Wire Harness
The light does not come on when the rear-right door is opened.
  1. Rear-Right Door Courtesy Switch
  2. Wire Harness
The light does not come on when the rear-left door is opened.
  1. Rear-Left Door Courtesy Switch
  2. 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. Wire Harness
  3. Body ECU (Main)
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. ACC Fuse
  2. ECU-IG1 Fuse
  3. Ignition Switch
  4. Wire Harness
  5. Body ECU (Main)
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
Room light does not come on.
  1. Bulb
  2. Room Light
  3. Rear Personal Light
  4. Wire Harness
Front personal light does not come on.
  1. Bulb
  2. Front Personal Light
  3. Room Light
  4. Wire Harness
Rear Room light does not come on.
  1. Bulb
  2. Rear Room Light
  3. Wire Harness
Vanity light does not come on.
  1. Bulb
  2. Vanity Light
  3. Wire Harness
Glove compartment light does not come on.
  1. Bulb
  2. Glove Compartment Courtesy Switch
  3. Wire Harness
Courtesy light does not come on.
  1. Bulb
  2. Door Courtesy Switch
  3. Wire Harness
Foot light does not come on.
  1. Wire Harness
  2. Bulb (LED)
  3. Body ECU (Sub)
  4. Body ECU (Main)
Center Console Spot light does not come on.
  1. Wire Harness
  2. Bulb (LED)
  3. Body Control ECU (Sub)
Side Step and Outer Foot light does not come on.
  1. Wire Harness
  2. Bulb (LED)
  3. Body ECU (Sub)
  4. Body ECU (Main)
Inside Door Handle Illumination does not come on.
  1. Wire Harness
  2. Bulb (LED)
  3. Body ECU (Sub)
  4. Body ECU (Main)

BACK-UP LIGHT SYSTEM: 

PROBLEM SYMPTOMS TABLE - BACK UP LIGHT SYSTEM

Symptom Suspect Area
Back-up Light does not come on.
  1. GAUGE 2 Fuse
  2. Bulb
  3. Ignition Switch
  4. Wire Harness
Back-up Light remains always on.
  1. Park/Neutral Position Switch
  2. Wire Harness
Only one light does not come on.
  1. Bulb
  2. Wire Harness

STOP LIGHT SYSTEM: 

PROBLEM SYMPTOMS TABLE - STOP LIGHT SYSTEM

Symptom Suspect Area
Stop light does not come on.
  1. STOP Fuse
  2. Stop Light Switch
  3. Wire Harness
  4. Body ECU (Sub)
Stop light always comes on.
  1. Stop Light Switch
  2. Wire Harness
  3. Body ECU (Sub)
Only one light always comes on.
  1. Wire Harness
Only one light does not come on.
  1. Bulb
  2. Wire Harness

WIPER AND WASHER SYSTEM: 

PROBLEM SYMPTOMS TABLE - WIPER AND WASHER SYSTEM

Symptom Suspect Area
Front wiper and washer do not operate.
  1. RR WIPER Fuse
  2. Wiper Switch
  3. Wiper Motor
  4. Wire Harness
  5. Wiper Control ECU
Front wiper does not operate in LO or HI.
  1. Wiper Switch
  2. Wiper Motor
  3. Wire Harness
  4. Wiper Control ECU
Front wiper does not operate in INT.
  1. Wiper Switch
  2. Wiper Motor
  3. Wire Harness
  4. Wiper Control ECU
Front wiper does not operate in AUTO.
  1. Wiper Switch
  2. Rain Sensor
  3. Wire Harness
  4. Wiper Control ECU
Front washer motor does not operate.
  1. WASHER Fuse
  2. Washer Switch
  3. Washer Motor
  4. Wire Harness
Front wiper does not operate when washer switch is ON.
  1. WASHER Fuse
  2. Washer Switch
  3. Wiper Motor
  4. Wire Harness
Rear wiper does not operate.
  1. WIPER Fuse
  2. Rear Wiper Motor
  3. Rear Wiper Switch
  4. Back Door Courtesy Switch
  5. Wire Harness
  6. Body ECU (Sub)
Rear wiper does not operate in INT or ON position.
  1. Rear Wiper Switch
  2. Wire Harness
  3. Body ECU (Sub)
Rear wiper does not return to OFF position.
  1. Rear Wiper Motor
  2. Wire Harness
Rear washer motor does not operate.
  1. Rear Washer Motor
  2. Rear Washer Switch
  3. Wire Harness
Washer fluid does not operate.
  1. Washer Hose and Nozzle
*1 : Inspect wiper arm and blade set positions.

COMBINATION METER (Meter Gauges and Illumination): 

Fig 3: Combination Meter (Meter Gauges And Illumination) - Problem Symptoms Table (1 Of 2)
G02994138Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 4: Combination Meter (Meter Gauges And Illumination) - Problem Symptoms Table (2 Of 2)
G02994139Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

COMBINATION METER (Warning Light): 

PROBLEM SYMPTOMS TABLE - WARNING LIGHTS

Symptom Suspect Area
Warning lights do not come on. (Except discharge, open door and SRS)
  1. GAUGE 1 Fuse
  2. Wire Harness
  3. Combination Meter
Fuel level warning light does not come on.
  1. Fuel Sender Gauge
  2. Wire Harness
  3. Combination Meter
ABS warning light does not come on.
  1. ABS ECU
  2. Wire Harness
  3. Combination Meter
Seat belt warning light does not come on.
  1. Seat Belt Buckle Switch
  2. Wire Harness
  3. Combination Meter
  4. Body ECU (Main)
Discharge warning light does not come on.
  1. METER Fuse
  2. Generator
  3. Wire Harness
  4. Combination Meter
Brake warning light does not come on.
  1. Parking Brake Switch
  2. Brake Fluid Level Warning Switch
  3. Wire Harness
  4. Combination Meter
SRS warning light does not come on.
  1. ECU-B2
  2. Airbag Sensor Assembly
  3. Wire Harness
  4. Combination Meter
Open door warning light does not comes on.
  1. DOME Fuse
  2. Door Courtesy Switch
  3. Wire Harness
  4. Combination Meter
A/T oil temperature warning light does not comes on.
  1. Combination Meter
  2. Wire Harness
  3. ECM

COMBINATION METER (Indicator Light): 

PROBLEM SYMPTOMS TABLE - INDICATOR LIGHTS

Symptom Suspect Area
Cruise control indicator light does not come on.
  1. Combination Meter
  2. Wire Harness
  3. ECM
High-beam indicator light does not come on.
  1. Combination Meter
  2. Wire Harness
  3. Headlight System
Turn indicator light does not come on.
  1. Combination Meter
  2. Wire Harness
  3. Turn Signal and Hazard Warning System
Shift indicator lights do not come on.
  1. Park/Neutral Position Switch
  2. Wire Harness
  3. Combination Meter
  4. ECM
Only one shift indicator does not come on.
  1. Combination Meter
Malfunction indicator light does not come on.
  1. Combination Meter
  2. Wire Harness
  3. ECM
ECT PWR indicator light does not come on.
  1. ECT Pattern Select Switch
  2. Wire Harness
  3. Combination Meter
  4. ECT System
2nd start ETCS indicator light does not come on.
  1. Combination Meter
  2. Wire Harness
  3. ECM
Center Diff. lock indicator light does not come on.
  1. Bulb
  2. Transfer 4WD Position Detection Switch
  3. Wire Harness
  4. Combination Meter
Indicator lights do not light up. (Except Turn, Hi-beam and security)
  1. MET Fuse
  2. Wire Harness

DEFOGGER SYSTEM: 

PROBLEM SYMPTOMS TABLE - DEFOGGER SYSTEM

Symptom Suspect Area
All defogger systems do not operate.
  1. DEFOG Fuse
  2. DEFOG Relay
  3. Wire Harness
  4. Defogger Switch (Integration Control Panel Assembly)
Rear window defogger does not operate.
  1. Defogger Wire
  2. Choke Coil
  3. Wire Harness
  4. Rear Defogger Switch (Integration Control Panel Assembly)
Mirror defogger does not operate.
  1. MIR HTR Fuse
  2. Engine Room J/B Relay Circuit
  3. Wire Harness
  4. Mirror Defogger Switch (Integration Control Panel Assembly)

POWER WINDOW CONTROL SYSTEM: 

This system uses the multiplex communication system, so check diagnosis system of the multiplex communication system before you proceed with troubleshooting.

PROBLEM SYMPTOMS TABLE - POWER WINDOW CONTROL SYSTEM

Symptom Suspect Area
All the power windows do not operate. (Power Door Lock System is normal.)
  1. P/W (FL, FR, RL, RR) Fuse
  2. Wire Harness
  3. Power Window Master Switch
Only the driver's window does not operate.
  1. Power Window Master Switch
  2. Power Window Switch
  3. Power Window Motor
  4. Wire Harness
  5. Body ECU (Main)
"Window lock function" does not operate.
  1. Power Window Master Switch

POWER DOOR LOCK CONTROL SYSTEM: 

This system uses the body control system, so check diagnosis system of the body control system before you proceed with troubleshooting.

PROBLEM SYMPTOMS TABLE - POWER DOOR LOCK CONTROL SYSTEM

Symptom Suspect Area
All the doors cannot be locked or unlocked. (Power Window Control System is normal.)
  1. DOOR Fuse
  2. Door Lock Control Switch
  3. Wire Harness
  4. Body ECU (Main)
Only one side door lock control does not operate.
  1. Door Lock Motor
  2. Wire Harness
Door key related function does not operate.
  1. Door Key Lock and Unlock Switch
  2. Wire Harness
  3. Body ECU (Main)
Key confinement prevention function does not operate.
  1. Key Unlock Warning Switch
  2. Door Courtesy Switch
  3. Wire Harness

POWER SEAT CONTROL SYSTEM: 

PROBLEM SYMPTOMS TABLE - POWER SEAT CONTROL SYSTEM

Symptom Suspect Area
Both driver and passenger power seats do not operate. (Door lock does not operate.)
  1. ALTS Fuse
  2. Wire Harness
Driver's seat does not operate.
  1. LH-SEAT Fuse
  2. Power Seat Control Switch ((1))
  3. Wire Harness
  4. Power Seat Control ECU
Passenger's seat does not operate.
  1. RH-SEAT Fuse
  2. Wire Harness
  3. Power Seat Control Switch ((2))
"Slide operation" does not operate.
  1. Power Seat Control Switch ((2))
  2. Power Seat Control Switch ((1))
  3. Wire Harness
  4. Slide Motor ((1), (2))
  5. Power Seat Control ECU ((1))
"Front vertical operation" does not operate.
  1. Power Seat Control Switch ((2))
  2. Power Seat Control Switch ((1))
  3. Wire Harness
  4. Front Vertical Motor ((1), (2))
  5. Power Seat Control ECU ((1))
"Lifter operation" does not operate.
  1. Power Seat Control Switch ((2))
  2. Power Seat Control Switch ((1))
  3. Wire Harness
  4. Lifter Motor ((1), (2))
  5. Power Seat Control ECU ((1))
"Reclining operation" does not operate.
  1. Power Seat Control Switch ((2))
  2. Power Seat Control Switch ((1))
  3. Wire Harness
  4. Reclining Motor ((1), (2))
  5. Power Seat Control ECU ((1))
"Lumbar support operation" does not operate.
  1. Power Seat Control Switch ((1))
  2. Wire Harness
  3. Lumbar Support Motor ((1))
  4. Power Seat Control ECU ((1))
(1) Driver's Seat

(2) Passenger's Seat

POWER MIRROR CONTROL SYSTEM: 

PROBLEM SYMPTOMS TABLE - POWER MIRROR CONTROL SYSTEM

Symptom Suspect Area
Mirror does not operate.
  1. ECU-B2 Fuse
  2. ACC Fuse
  3. Mirror Switch
  4. Wire Harness
Mirror operates abnormally.
  1. Mirror Switch
  2. Mirror Motor
  3. Wire Harness

SEAT HEATER SYSTEM: 

PROBLEM SYMPTOMS TABLE - SEAT HEATER SYSTEM

Symptom Suspect Area
Seat heaters do not operate. (Driver's and Passenger's)
  1. SEAT HTR Fuse
  2. Seat Heater Switch (D, P)
  3. Wire Harness
  4. Seat Heater
Driver's seat heater does not operate.
  1. Seat Heater Switch (D, P)
  2. Wire Harness
Passenger's seat heater does not operate.
  1. Seat Heater Switch (D, P)
  2. Wire Harness
Seat heater temperature is too hot.
  1. Seat Heater

AUDIO SYSTEM: 

AUDIO SYSTEM - PROBLEM SYMPTOMS

Symptom Suspect Area Refer To
Audio system abnormal operation. TROUBLESHOOTING TROUBLESHOOTING

MULTI DISPLAY SYSTEM: 

MULTI DISPLAY SYSTEM - PROBLEM SYMPTOMS

Symptom Suspect Area Refer To
Clock loses or gains time. TROUBLESHOOTING NO.2 TROUBLESHOOTING
Drive monitor function malfunction. TROUBLESHOOTING NO.3 TROUBLESHOOTING
Outer temperature display malfunction. TROUBLESHOOTING NO.4 TROUBLESHOOTING
Security indicator does not come on. TROUBLESHOOTING SECURITY INDICATOR CIRCUIT , see SECURITY INDICATOR LIGHT CIRCUIT

GARAGE DOOR OPENER SYSTEM: 

PROBLEM SYMPTOMS TABLE - GARAGE DOOR OPENER SYSTEM

Symptom Suspect Area
The equipment of which code has been registered does not operate.
  1. Garage Door Opener Switch
  2. Wire Harness
  3. (1)
LED does not light up. (Even though either switch is pressed.)
  1. Garage Door Opener Switch
  2. Wire Harness
LED does not light up. (Only one switch is pressed.) Garage Door Opener Switch
(1) As the GARAGE DOOR OPENER on the vehicle side seems to be normal, check the OPENER on the equipment side, of which code has been registered.

ENGINE IMMOBILIZER SYSTEM: 

ENGINE IMMOBILIZER SYSTEM - PROBLEM SYMPTOMS

Symptom Suspect Area Refer To
Engine immobilizer system does not operate. DIAGNOSIS SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

HORN SYSTEM: 

PROBLEM SYMPTOMS TABLE - HORN SYSTEM

Symptom Suspect Area
Horn system does not operate.
  1. HORN Fuse
  2. Horn
  3. Horn Switch
  4. Wire Harness
  5. Engine Room J/B Relay Circuit
Horns blow all the time.
  1. Horn Switch
  2. Wire Harness
  3. Engine Room J/B Relay Circuit
One horn operates but the other horn does not operate.
  1. Horn
  2. Wire Harness
Horns operate abnormally.
  1. Engine Room J/B Relay Circuit
  2. Horn
  3. Wire Harness
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