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Problem Symptoms Table

WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

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 ).

SYMPTOM (IGNITION SWITCH AND KEY UNLOCK WARNING SWITCH)

Symptom Suspect Area Action
Ignition switch is not set to each position.
  1. Ignition switch
  2. Power source circuit
  1. INSPECTION
  2. -
Ignition key illumination does not comes on.
  1. Transponder key amplifier with coil
  2. Wire Harness
  3. Body ECU (Main)
  1. INSPECTION
  2. -
  3. HOW TO PROCEED WITH TROUBLESHOOTING
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
  1. INSPECTION
  2. INSPECTION
  3. -
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
  1. INSPECTION
  2. -

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 ).

SYMPTOM (HEADLIGHT AND TAILLIGHT SYSTEM)

Symptom Suspect Area Action
"Automatic light control system" does not operate.
  1. Automatic Light Control Sensor
  2. Light Control Switch
  3. Door Courtesy Switch
  4. Wire Harness
  5. Body ECU (Main)
  1. INSPECTION
  2. INSPECTION
  3. INSPECTION
  4. -
  5. HOW TO PROCEED WITH TROUBLESHOOTING
Auto turn-off system does not operate when the driver's door is opened.
  1. Drivers Door Courtesy Switch
  1. INSPECTION
Auto turn-off system: Headlight and taillight do not come on.
  1. Wire Harness
  2. Body ECU (Main)
  1. -
  2. HOW TO PROCEED WITH TROUBLESHOOTING
Auto turn-off system: Headlight and taillight stay on.
  1. Wire Harness
  2. Body ECU (Main)
  1. -
  2. HOW TO PROCEED WITH TROUBLESHOOTING
Only one headlight comes on.
  1. Bulb
  2. Daytime Running Light No. 3, 4 Relays
  3. Wire Harness
  4. Body ECU (Main)
  1. -
  2. INSPECTION
  3. -
  4. INSPECTION
"LO-beam" does not come on (All).
  1. Engine Room J/B Relay Circuit
  2. Wire Harness
  3. Body ECU (Main)
  1. INSPECTION
  2. -
  3. INSPECTION
"LO-beam" does not come on (One side).
  1. Bulb
  2. H-LP L-LWR Fuse
  3. H-LP R-LWR Fuse
  4. Wire Harness
  1. -
  2. -
  3. -
  4. -
"Hl-beam" does not come on (All).
  1. Headlight Dimmer Switch
  2. Wire Harness
  3. Body ECU (Main)
  1. INSPECTION
  2. -
  3. INSPECTION
"Hl-beam" does not come on (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
  1. -
  2. -
  3. -
  4. INSPECTION
  5. -
"Flash" does not come on.
  1. Headlight Dimmer Switch
  2. Wire Harness
  3. Body ECU (Main)
  1. INSPECTION
  2. -
  3. INSPECTION
Headlight does not come on.
  1. Bulb
  2. Headlight Dimmer Switch
  3. Light Control Switch
  4. Daytime Running Light No. 3, 4 Relays
  5. Engine Room J/B Relay Circuit
  6. Wire Harness
  7. Body ECU (Main)
  1. -
  2. INSPECTION
  3. INSPECTION
  4. INSPECTION
  5. INSPECTION
  6. -
  7. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Headlight does not come on with light control switch in HEAD.
  1. Light Control Switch
  2. Wire Harness
  3. Body ECU (Main)
  1. INSPECTION
  2. -
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Headlight does not go off with light control switch in OFF.
  1. Engine Room J/B Relay Circuit
  2. Wire Harness
  3. Body ECU (Main)
  1. LOCATION
  2. -
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Headlight flickers.
  1. Bulb
  2. Wire Harness
  1. -
  2. -
Headlight is dark.
  1. Bulb
  2. Wire Harness
  1. -
  2. -
Taillight does not come on with light control switch in TAIL.
  1. Light Control Switch
  2. Engine Room J/B Relay Circuit
  3. Wire Harness
  4. Body ECU (Sub)
  5. Body ECU (Main)
  1. INSPECTION
  2. INSPECTION
  3. -
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  5. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Taillight does not go off with light control switch in OFF.
  1. Light Control Switch
  2. Engine Room J/B Relay Circuit
  3. Wire Harness
  4. Body ECU (Sub)
  5. Body ECU (Main)
  1. INSPECTION
  2. INSPECTION
  3. -
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  5. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Headlight does not come on with engine running and light control switch in OFF.
  1. ECU-B2 Fuse
  2. ECU-IG1 Fuse
  3. Daytime Running Light No. 3, 4 Relays
  4. Generator L Terminal
  5. Parking Brake Switch
  6. Wire Harness
  7. Body ECU (Main)
  1. -
  2. -
  3. INSPECTION
  4. GENERATORS & REGULATORS
  5. INSPECTION
  6. -
  7. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE

FOG LIGHT SYSTEM: 

SYMPTOM (FOG LIGHT SYSTEM)

Symptom Suspect Area Action
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
  1. INSPECTION
  2. INSPECTION
  3. INSPECTION
  4. -
Fog light does not come on with light control SW HEAD (Headlight does not light).
  1. (1) Other Parts
  2. Wire Harness
  1. -
  2. -
Only one light does not come on.
  1. Bulb
  2. Wire Harness
  1. -
  2. -
(1) Inspect Headlight System

TURN SIGNAL AND HAZARD WARNING SYSTEM: 

TURN SIGNAL AND HAZARD WARNING SYSTEM

Symptom Suspect Area Action
"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
  1. -
  2. -
  3. INSPECTION
  4. INSPECTION
  5. -
Hazard warning light does not come on. (Turn is normal)
  1. Hazard Warning Switch
  2. Wire Harness
  1. INSPECTION
  2. -
Turn signal does not come on. (Hazard is normal)
  1. Turn Signal Switch
  2. Wire Harness
  1. INSPECTION
  2. -
Turn signal does not come on in one direction.
  1. Turn Signal Switch
  2. Wire Harness
  1. INSPECTION
  2. -
Only one bulb does not come on.
  1. Bulb
  2. Wire Harness
  1. -
  2. -

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 ).

INTERIOR LIGHT SYSTEM

Symptom Suspect Area Action
All the lights do not come ON.
  1. DOME Fuse
  2. DOME Relay (Cowl Side J/B LH)
  3. Body ECU (Main)
  1. -
  2. INSPECTION
  3. HOW TO PROCEED WITH TROUBLESHOOTING
The light does not come ON when the driver's door is opened.
  1. Driver's Door Courtesy Switch
  2. Wire Harness
  1. INSPECTION
  2. -
The light does not come ON when the passenger's door is opened.
  1. Passenger's Door Courtesy Switch
  2. Wire Harness
  1. INSPECTION
  2. -
The light does not come on when the rear-right door is opened.
  1. Rear-Right Door Courtesy Switch
  2. Wire Harness
  1. INSPECTION
  2. -
The light does not come on when the rear-left door is opened.
  1. Rear-Left Door Courtesy Switch
  2. Wire Harness
  1. INSPECTION
  2. -
Only one of the bulbs comes ON.
  1. Bulb
  1. -
The illumination does not fade out when all the doors are closed.
  1. Courtesy Switch
  2. Wire Harness
  3. Body ECU (Main)
  1. INSPECTION
  2. -
  3. HOW TO PROCEED WITH TROUBLESHOOTING
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)
  1. -
  2. -
  3. INSPECTION
  4. -
  5. HOW TO PROCEED WITH TROUBLESHOOTING
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
  1. INSPECTION
  2. -
Room light does not come on.
  1. Bulb
  2. Room Light
  3. Rear Personal Light
  4. Wire Harness
  1. -
  2. INSPECTION
  3. INSPECTION
  4. -
Front personal light does not come on.
  1. Bulb
  2. Front Personal Light
  3. Room Light
  4. Wire Harness
  1. -
  2. INSPECTION
  3. INSPECTION
  4. -
Rear Room light does not come on
  1. Bulb
  2. Rear Room Light
  3. Wire Harness
  1. -
  2. INSPECTION
  3. -
Vanity light does not come on.
  1. Bulb
  2. Vanity Light
  3. Wire Harness
  1. -
  2. INSPECTION
  3. -
Glove compartment light does not come on.
  1. Bulb
  2. Glove Compartment Courtesy Switch
  3. Wire Harness
  1. -
  2. INSPECTION
  3. -
Courtesy light does not come on.
  1. Bulb
  2. Door Courtesy Switch
  3. Wire Harness
  1. -
  2. INSPECTION
  3. -
Foot light does not come on.
  1. Wire Harness
  2. Bulb (LED)
  3. Body ECU (Sub)
  4. Body ECU (Main)
  1. -
  2. -
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Center Console Spot light does not come on.
  1. Wire Harness
  2. Bulb (LED)
  3. Body Control ECU (Sub)
  1. -
  2. -
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Side Step and Outer Foot light does not come on.
  1. Wire Harness
  2. Bulb (LED)
  3. Body ECU (Sub)
  4. Body ECU (Main)
  1. -
  2. -
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Inside Door Handle Illumination does not come on.
  1. Wire Harness
  2. Bulb (LED)
  3. Body ECU (Sub)
  4. Body ECU (Main)
  1. -
  2. -
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE

BACK-UP LIGHT SYSTEM: 

BACK-UP LIGHT SYSTEM

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

STOP LIGHT SYSTEM: 

STOP LIGHT SYSTEM

Symptom Suspect Area Action
Stop light does not come on.
  1. STOP Fuse
  2. Stop Light Switch
  3. Wire Harness
  4. Body ECU (Sub)
  1. -
  2. INSPECTION
  3. -
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Stop light always comes on.
  1. Stop Light Switch
  2. Wire Harness
  3. Body ECU (Sub)
  1. INSPECTION
  2. -
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Only one light always comes on.
  1. Wire Harness
  1. -
Only one light does not come on.
  1. Bulb
  2. Wire Harness
  1. -
  2. -

WIPER AND WASHER SYSTEM: 

WIPER AND WASHER SYSTEM

Symptom Suspect Area Action
Front wiper and washer do not operate.
  1. RR WIPER Fuse
  2. Wiper Switch
  3. Wiper Motor
  4. Wire Harness
  5. Wiper Control ECU
  1. -
  2. INSPECTION
  3. INSPECTION
  4. -
  5. HOW TO PROCEED WITH TROUBLESHOOTING
Front wiper does not operate in LO or HI.
  1. Wiper Switch
  2. Wiper Motor
  3. Wire Harness
  4. Wiper Control ECU
  1. INSPECTION
  2. INSPECTION
  3. -
  4. HOW TO PROCEED WITH TROUBLESHOOTING
Front wiper does not operate in INT.
  1. Wiper Switch
  2. Wiper Motor
  3. Wire Harness
  4. Wiper Control ECU
  1. INSPECTION
  2. INSPECTION
  3. -
  4. HOW TO PROCEED WITH TROUBLESHOOTING
Front wiper does not operate in AUTO.
  1. Wiper Switch
  2. Rain Sensor
  3. Wire Harness
  4. Wiper Control ECU
  1. INSPECTION
  2. HOW TO PROCEED WITH TROUBLESHOOTING
  3. HOW TO PROCEED WITH TROUBLESHOOTING
  4. HOW TO PROCEED WITH TROUBLESHOOTING
Front washer motor does not operate.
  1. WASHER Fuse
  2. Washer Switch
  3. Washer Motor
  4. Wire Harness
  1. -
  2. INSPECTION
  3. INSPECTION
  4. -
Front wiper does not operate when washer switch is ON.
  1. WASHER Fuse
  2. Washer Switch
  3. Wiper Motor
  4. Wire Harness
  1. -
  2. INSPECTION
  3. INSPECTION
  4. -
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)
  1. -
  2. INSPECTION
  3. INSPECTION
  4. INSPECTION
  5. -
  6. HOW TO PROCEED WITH TROUBLESHOOTING
Rear wiper does not operate in INT or ON position.
  1. Rear Wiper Switch
  2. Wire Harness
  3. Body ECU (Sub)
  1. INSPECTION
  2. -
  3. HOW TO PROCEED WITH TROUBLESHOOTING
Rear wiper does not return to OFF position.
  1. Rear Wiper Motor
  2. Wire Harness
  1. INSPECTION
  2. -
Rear washer motor does not operate.
  1. Rear Washer Motor
  2. Rear Washer Switch
  3. Wire Harness
  1. INSPECTION
  2. INSPECTION
  3. -
Washer fluid does not operate.
  1. Washer Hose and Nozzle
  1. -

*1 : Inspect wiper arm and blade set positions.

COMBINATION METER (Meter Gauges and Illumination): 

COMBINATION METER

Symptom Suspect Area Action
Tachometer, fuel gauge and engine coolant temperature gauge do not operate.
  1. GAUGE 1 Fuse
  2. Wire Harness
  3. Combination Meter
  1. -
  2. -
  3. CIRCUIT
Speedometer does not operate.
  1. GAUGE 1 Fuse
  2. Speed Sensor
  3. Wire Harness
  4. Combination Meter
  1. -
  2. INSPECTION
  3. -
  4. CIRCUIT
Tachometer does not operate.
  1. Igniter
  2. Wire Harness
  3. Combination Meter
  1. IGNITION SYSTEMS
  2. -
  3. CIRCUIT
Fuel gauge does not operate or is in abnormal operation.
  1. Fuel Receiver Gauge
  2. Fuel Sender Gauge
  3. Wire Harness
  4. Combination Meter
  1. INSPECTION
  2. INSPECTION
  3. -
  4. CIRCUIT
Oil pressure gauge does not operate.
  1. Oil Pressure Receiver Gauge
  2. Oil Pressure Sender Gauge
  3. Wire Harness
  4. Combination Meter
  1. INSPECTION
  2. INSPECTION
  3. -
  4. CIRCUIT
Voltmeter does not operate.
  1. Voltmeter
  2. Wire Harness
  3. Combination Meter
  1. INSPECTION
  2. -
  3. CIRCUIT
Engine coolant temperature gauge does not operate or is in abnormal operation.
  1. Engine Coolant Temperature Receiver Gauge
  2. Engine Coolant Temperature Sender Gauge
  3. Wire Harness
  4. Combination Meter
  1. INSPECTION
  2. INSPECTION
  3. -
  4. CIRCUIT
All illumination lights do not light up.
  1. Light Control Rheostat
  2. Wire Harness
  1. INSPECTION
  2. -
Brightness does not change even when rheostat is turned.
  1. Wire Harness
  2. Combination Meter
  1. -
  2. INSPECTION
Only one illumination light does not come on.
  1. Wire Harness
  2. Combination Meter
  1. -
  2. -

COMBINATION METER (Warning Light): 

COMBINATION METER (WARNING LIGHT)

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

COMBINATION METER (indicator Light): 

SYMPTOM COMBINATION METER (indicator Light)

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

DEFOGGER SYSTEM: 

SYMPTOM DEFOGGER SYSTEM

Symptom Suspect Area Action
All defogger systems do not operate.
  1. DEFOG Fuse
  2. DEFOG Relay
  3. Wire Harness
  4. Defogger Switch (Integration Control Panel Assembly)
  1. -
  2. INSPECTION
  3. -
  4. INSPECTION
Rear window defogger does not operate.
  1. Defogger Wire
  2. Choke Coil
  3. Wire Harness
  4. Rear Defogger Switch (Integration Control Panel Assembly)
  1. INSPECTION
  2. -
  3. -
  4. INSPECTION
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)
  1. -
  2. INSPECTION
  3. -
  4. INSPECTION

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.

SYMPTOM POWER WINDOW CONTROL SYSTEM

Symptom Suspect Area Action
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
  1. -
  2. -
  3. INSPECTION
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)
  1. INSPECTION
  2. INSPECTION
  3. INSPECTION
  4. -
  5. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
"Window lock function" does not operate.
  1. Power Window Master Switch
  1. INSPECTION

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.

POWER DOOR LOCK CONTROL SYSTEM (SYMPTOM)

Symptom Suspect Area Action
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)
  1. -
  2. INSPECTION
  3. -
  4. HOW TO PROCEED WITH TROUBLESHOOTING
Only one side door lock control does not operate.
  1. Door Lock Motor
  2. Wire Harness
  1. INSPECTION
  2. -
Door key related function does not operate.
  1. Door Key Lock and Unlock Switch
  2. Wire Harness
  3. Body ECU (Main)
  1. INSPECTION
  2. -
  3. HOW TO PROCEED WITH TROUBLESHOOTING
Key confinement prevention function does not operate.
  1. Key Unlock Warning Switch
  2. Door Courtesy Switch
  3. Wire Harness
  1. INSPECTION
  2. INSPECTION
  3. -

POWER SEAT CONTROL SYSTEM: 

POWER SEAT CONTROL SYSTEM (SYMPTOM)

Symptom Suspect Area Action
Both driver and passenger power seats do not operate. (Door lock does not operate.)
  1. ALTS Fuse
  2. Wire Harness
  1. -
  2. -
Driver's seat does not operate.
  1. LH-SEAT Fuse
  2. Power Seat Control Switch (1)
  3. Wire Harness
  4. Power Seat Control ECU
  1. -
  2. TERMINALS OF ECU
  3. -
  4. TERMINALS OF ECU
Passenger's seat does not operate.
  1. RH-SEAT Fuse
  2. Wire Harness
  3. Power Seat Control Switch (2)
  1. -
  2. -
  3. INSPECTION
"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)
  1. INSPECTION
  2. TERMINALS OF ECU
  3. -
  4. INSPECTION
  5. TERMINALS OF ECU
"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)
  1. INSPECTION
  2. TERMINALS OF ECU
  3. -
  4. INSPECTION
  5. TERMINALS OF ECU
"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)
  1. INSPECTION
  2. TERMINALS OF ECU
  3. -
  4. INSPECTION
  5. TERMINALS OF ECU
"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)
  1. INSPECTION
  2. TERMINALS OF ECU
  3. -
  4. INSPECTION
  5. TERMINALS OF ECU
"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. TERMINALS OF ECU
  2. -
  3. INSPECTION
  4. TERMINALS OF ECU
(1) Driver's Seat
(2) Passenger's Seat

POWER MIRROR CONTROL SYSTEM: 

POWER MIRROR CONTROL SYSTEM (SYMPTOM)

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

SEAT HEATER SYSTEM: 

SEAT HEATER SYSTEM (SYMPTOM)

Symptom Suspect Area Action
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
  1. -
  2. INSPECTION
  3. -
  4. INSPECTION
Driver's seat heater does not operate.
  1. Seat Heater Switch (D, P)
  2. Wire Harness
  1. INSPECTION
  2. -
Passenger's seat heater does not operate.
  1. Seat Heater Switch (D, P)
  2. Wire Harness
  1. INSPECTION
  2. -
Seat heater temperature is too hot.
  1. Seat Heater
  1. INSPECTION

AUDIO SYSTEM: 

AUDIO SYSTEM (SYMPTOM)

Symptom Suspect Area Action
Audio system abnormal operation. TROUBLESHOOTING TROUBLESHOOTING

MULTI DISPLAY SYSTEM: 

MULTI DISPLAY SYSTEM (SYMPTOM)

Symptom Suspect Area Action
Multi display does not operate. TROUBLESHOOTING NO. 1 TROUBLESHOOTING
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
SECURITY INDICATOR LIGHT CIRCUIT

GARAGE DOOR OPENER SYSTEM: 

GARAGE DOOR OPENER SYSTEM (SYMPTOM)

Symptom Suspect Area Action
The equipment of which code has been registered does not operate.
  1. Garage Door Opener Switch
  2. Wire Harness
  3. (1)
  1. INSPECTION
  2. -
  3. -
LED does not light up. (Even though either switch is pressed.)
  1. Garage Door Opener Switch
  2. Wire Harness
  1. INSPECTION
  2. -
LED does not light up. (Only one switch is pressed.) Garage Door Opener Switch INSPECTION
(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 (SYMPTOM)

Symptom Suspect Area Action
Engine immobilizer system does not operate. See ENGINE IMMOBILIZER SYSTEM - DIAGNOSIS HOW TO PROCEED WITH TROUBLESHOOTING

HORN SYSTEM: 

HORN SYSTEM (SYMPTOM)

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