Toyota
Toyota Land Cruiser
 Service Manual
Body Electrical
Troubleshooting

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 ( DI-1038 ).

Symptom

Suspect Area

Ignition switch is not set to each position. 4. Ignition switch 5. Power source circuit
Ignition key illumination does not light up. 1. Bulb
2. Body ECU
3. Wire Hauness
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 ( DI-1038 ).

Symptom

Suspect Area

"Automatic light control system" does not operate. 1. Automatic Light Control Sensor 2. Light Control Switch 3. Door Courtesy Switch 4. Wire Harness
Auto turn-off system does not operate when the driver's door is opened. 1. Drivers Door Courtesy Switch
Auto turn-off system: Headlight and taillight do not come on. 1. Body ECU
2. Wire Harness
Auto turn-off system: Headlight and taillight stay on. 1. Body ECU
2. Wire Harness
Only one headlight comes on. 1. Daytime Running Light No.3, 4 Relays 2. Body ECU
3. Bulb
4. Wire Harness
"LO-beam" does not light (All). 1. Engine Room J/B Relay Circuit 2. Wire Harness
"LO-beam" does not light (One side). 1. Bulb
2. H-LP L-LWR Fuse
3. H-LP R-LWR Fuse
4. Wire Harness
"HI-beam" does not light (All). 1. Headlight Dimmer Switch 2. Body ECU
3. Wire Harness
"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, 4 Relays 5. Wire Harness
"Flash" does not light. 1. Headlight Dimmer Switch 2. Body ECU
3. Wire Harness
Headlight does not come on. 1. Engine Room J/B Relay Circuit 2. Body ECU
3. Daytime Running Light No.3, 4 Relays 4. Headlight Dimmer Switch 5. Light Control Switch 6. Wire Harness
7. Bulb
Headlight does not come on with light control switch in HEAD. 1. Light Control Switch 2. Wire Harness
Headlight does not go out with light control switch in OFF. 1. Engine Room J/B Relay Circuit 2. Wire Harness
Headlight flickers. 1. Bulb
2. Wire Harness
Headlight is dark. 1. Bulb
2. Wire Harness
Taillight does not come on with light control switch in TAIL. 1. Engine Room J/B Relay Circuit 2. Light Control Switch 3. Wire Harness
Taillight does not go out with light control switch in OFF. 1. Engine Room J/B Relay Circuit 2. Light Control Switch 3. Wire Harness
Headlight does not come on with engine running and light control switch in OFF 1. ECU-B1 Fuse
2. ECU-IG1 Fuse
3. Body ECU
4. Daytime Running Light No.3, 4 Relays 5. Generator L Terminal 6. Parking Brake Switch 7. Wire Harness

FOG LIGHT SYSTEM:

Symptom

Suspect Area

Fog light does not light up with light control SW HEAD (Headlight is normal.) 1. FOG Fuse
2. Engine Room J/B Relay Circuit 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

"Hazard" and "Turn" do not light up. 1. ECU-IG2 Fuse
2. TURN HAZ Fuse
3. Ignitioin Switch
4. Turn Signal Flasher Relay 5. Wire Harness
Hazard warning light does not light up.

(Turn is normal)

1. Hazard Warning Switch 2. Wire Harness
Turn signal does not light up.

(Hazard is normal)

1. Turn Signal Switch 2. Wire Harness
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

INTERIOR LIGHT SYSTEM: This system uses the body control system, so check the body control system before you proceed with troubleshooting(  DI-1038 ).

Symptom

Suspect Area

All the lights do not come ON. 1. DOME Fuse
2. Body ECU
3. DOME Relay(Cowl Side J/B LH)
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. Boby ECU
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. ACC Fuse
3. ECU-IG1 Fuse
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. Wire Harness
Room light does not light up. 1. Bulb
2. Room Light
3. Rear Personal Light 4. Wire Harness
Front personal light does not light up. 1. Bulb
2. Front Personal Light 3. Room Light
4. Wire Harness
Rear Room light does not light up. 1. Bulb
2. Rear Room Light
3. Wire Harness
Vanity light does not light up. 1. Bulb
2. Vanity Light
3. Wire Harness
Glove compartment light does not light up. 1. Bulb
2. Glove Compartment Courtesy Switch 3. Wire Harness
Courtesy light does not light up. 1. Bulb
2. Door Courtesy Switch 3. Wire Harness

BACK-UP LIGHT SYSTEM:

Symptom

Suspect Area

Back-up Light does not light up. 1. GAUGE2 Fuse
2. Ignition Switch
3. Wire Harness
4. Bulb
Back-up Light remains always on 1. Park/ Neutral Position Switch 2. Wire Harness
Only one light does not light up. 1. Bulb
2. Wire Harness

STOP LIGHT SYSTEM:

Symptom

Suspect Area

Stop light does not light up. 1. STOP Fuse
2. Stop Light Switch
3. 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

WIPER AND WASHER SYSTEM:

Symptom

Suspect Area

Front wiper and washer do not operate 1. WIPER Fuse
2. Wiper Switch
3. Wiper Motor
4. Wire Harness
Front wiper does not operate in LO or HI 1. Wiper Switch
2. Wiper Motor
3. Wire Harness
Front wiper does not operate in INT. 1. Wiper Switch
2. Wiper Motor
3. Wire Harness
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. RR WIPER Fuse
2. Rear Wiper Motor
3. Rear Wiper Switch
4. Rear Wiper Relay
5. Wire Harness
Rear wiper does not operate in INT or ON position. 1. Rear Wiper Switch 2. Rear Wiper Relay
3. Wire Harness
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):

Symptom

Suspect Area

Tachometer, fuel gauge and engine coolant temperature gauge do not operate 1. GAUGE2 Fuse
2. Combination Meter
3. Wire Harness
Speedometer does not operate. 1. Speed Sensor
2. Combination Meter
3. Wire Harness
Tachometer does not operate. 1. Igniter
2. Combination Meter
3. Wire Harness
Fuel gauge does not operate or is in abnormal operation. 1. Fuel Receiver Gauge 2. Fuel Sender Gauge
3. Combination Meter
4. Wire Harness
Oil pressure gauge does not operate. 1. Oil Pressure Receiver Gauge 2. Oil Pressure Sender Gauge 3. Combination Meter
4. Wire Harness
Voltmeter does not operate. 1. Voltmeter
2. Combination Meter
3. Wire Harness
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. Combination Meter
4. Wire Harness
All illumination lights do not light up. 1. Light Control Rheostat 2. Wire Harness
Brightness does not change even when rheostat is turned. 1. Bulb
2. Wire Harness
Only one illumination light does not light up. 1. Bulb
2. Wire Harness

COMBINATION METER (Warning Light):

Symptom

Suspect Area

Warning lights do not light up. (Except discharge, open door and SRS) 1. GAUGE1 Fuse
2. Combination Meter
3. Wire Harness
Fuel level warning light does not light up. 1. LED
2. Combination Meter
3. Fuel Sender Gauge
4. Wire Harness
ABS warning light does not light up. 1. LED
2. ABS ECU
3. Wire Harness
Seat belt warning light does not light up. 1. LED
2. Seat Belt Buckle Switch 3. Wire Harness
4. Body ECU
Discharge warning light does not light up. 1. METER Fuse
2. LED
3. Wire Harness
4. Generator
Brake warning light does not light up. 1. LED
2. Parking Brake Switch 3. Brake Fluid Level Warning Switch 4. LED Check Relay
5. Combination Meter
6. Wire Harness
SRS warning light does not light up. 1. ECU-B2 Fuse
2. LED
3. Airbag Sensor Assembly 4. Combination Meter
5. Wire Harness
Open door warning light does not light up. 1. DOME Fuse
2. LED
3. Door Courtesy Switch 4. Combination Meter
5. Wire Harness
A/T oil temperature warning light does not light up. 1. LED
2. Combination Meter
3. Wire Harness
4. ECM

COMBINATION METER (Indicator Light):

Symptom

Suspect Area

Cruise control indicator light does not light up. 1. LED
2. Combination Meter
3. Wire Harness
4. ECM
High-beam indicator light does not light up. 1. LED
2. Combination Meter
3. Wire Harness
4. Headlight System
Turn indicator light does not light up. 1. LED
2. Combination Meter
3. Wire Harness
4. Turn Signal and Hazard Warning System
Shift indicator lights do not light up. 1. LED
2. Combination Meter
3. Park/Neutral Position Switch 4. Wire Harness
Only one shift indicator does not light up. 1. LED
2. Combination Meter
Malfunction indicator light does not light up. 1. LED
2. Combination Meter
3. Wire Harness
4. ECM
ECT PWR indicator light does not light up. 1. LED
2. ECT Pattern Select Switch 3. Combination Meter
4. Wire Harness
5. ECT System
2nd start ETCS indicator light does not light up. 1. LED
2. Combination Meter
3. Wire Harness
4. ECM
Center Diff. lock indicator light does not light up. 1. LED
2. Combination Meter
3. Transfer 4WD Position Detection Switch 4. Wire Harness
Indicator lights do not light up. (Except Turn, Hi-beam and security) 1. GAUGE2 Fuse
2. Wire Harness

DEFOGGER SYSTEM:

Symptom

Suspect Area

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

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

Suspect Area

All the power windows do not operate.

(Power Door Lock System is normal.)

1. P/W (FL, FR, RL, RR) Fuse 2. Power Window Master Switch 3. Wire Harness
Only the driver's window does not operate. 1. Power Window Master Switch 2. Body ECU
3. Power Window Motor
4. Wire Harness
"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.

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
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
Key confinement prevention function does not operate 1. Key Unlock Warning Switch 2. Door Courtesy Switch 3. Wire Harness

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 Switch (D) 3. Wire Harness
Passenger's seat does not operate. 1. RH SEAT Fuse
2. Power Seat Switch (P) 3. Wire Harness
"Slide operation" does not operate. 1. Power Seat Switch (D, P) 2. Wire Harness
3. Slide Motor (D, P)
"Front vertical operation" does not operate. 1. Power Seat Switch (D, P) 2. Wire Harness
3. Front Vertical Motor (D, P)
"Lifter operation" does not operate. 1. Power Seat Switch (D, P) 2. Wire Harness
3. Lifter Motor (D, P)
"Reclining operation" does not operate. 1. Power Seat Switch (D, P) 2. Wire Harness
3. Reclining Motor (D, P)
"Lumbar support operation" does not operate. 1. Power Seat Switch (D) 2. Wire Harness
3. Lumbar Support Motor (D)

(D): Driver's Seat
(P): Passenger's Seat

POWER MIRROR CONTROL SYSTEM:

Symptom

Suspect Area

Mirror does not operate. 1. ACC Fuse
2. Mirror Switch
3. Wire Harness
Mirror operates abnormally. 1. Mirror Switch
2. Mirror Motor
3. Wire Harness

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:

Symptom

Suspect Area

Audio system abnormal operation. TROUBLESHOOTINGS

MULTI DISPLAY:

Symptom

Suspect Area

Clock will not operate. TROUBLESHOOTING
Clock loses or gains time. TROUBLESHOOTING

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. *
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

* 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:

Symptom

Suspect Area

Engine immobilizer system does not operate. See DIAGNOSIS SYSTEM

HORN SYSTEM:

Symptom

Suspect Area

Horn system does not operate. 1. HORN Fuse
2. Engine Room J/B Relay Circuit 3. Horn Switch
4. Horn
5. Wire Harness
Horns blow all the time. 1. Engine Room J/B Relay Circuit 2. Horn Switch
3. Wire Harness
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
    More about Body Electrical:

    Antenna

    Audio system

    Body electrical system

    Combination meter

    Combination meter

    Compass

    Defogger system

    Engine immobiliser system

    Fog light system

    Garage door opener system

    Headlight and taillight system

    Horn system

    Interior light system

    Ignition switch and key unlock warning switch

    Multi display

    Overhead junction block

    Power door lock control system

    Power window control system

    Stop light system

    Sliding roof system

    Troubleshooting

    Turn signal and hazard warning system

    Wiper and washer system

    Wireless door lock control system

    Toyota Land Cruiser Service Manual / Body Electrical / Troubleshooting

    Toyota Land Cruiser Service Manual

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