1998 TOYOTA LAND CRUISER stop start

SYSTEM INDEX
M OVERALL ELECTRICAL WIRING DIAGRAM
2004 LAND CRUISER (EWD548U)
412
SYSTEMS LOCATION SYSTEMS LOCATION
Air Conditioning (Front) 31-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Conditioning (Rear) 31-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auto Antenna 28-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Glare-Resistant EC Mirror with Compass 15-3. . . . . . . . . . .
Back-Up Light 10-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Center Differential Lock 14-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cigarette Lighter 21-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combination Meter 30-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise Control 5-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electronically Controlled Transmission and A/T Indicator 5-6. . . . . . . . . .
Engine Control 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Immobiliser System 4-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Wiper and Washer 18-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Garage Door Opener 15-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horn 18-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Illumination 9-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mirror Heater 11-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Moon Roof 17-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multi-Display (w/o Navigation System) 29-3. . . . . . . . . . . . . . . . . . . . . . .
Multiplex Communication System 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
* Automatic Light Control
* Door Lock Control
* Front Fog Light
* Headlight
* Interior Light
* Key Reminder* Light Auto Turn Off
* Power Window
* Theft Deterrent
* Wireless Door Lock Control
Navigation System 26-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Outlet 20-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Rear Quarter Window 11-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Seat 22-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Source 1~31-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Tilt and Power Telescopic 23-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radio and Player (w/ Navigation System) 26-5. . . . . . . . . . . . . . . . . . . . .
Radio and Player (w/o Navigation System) 27-3. . . . . . . . . . . . . . . . . . . .
Rear Window Defogger 11-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Wiper and Washer 19-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Control Mirror 16-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seat Belt Warning 25-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seat Heater 21-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shift Lock 24-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SRS 13-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stop Light 10-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Taillight 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TOYOTA Parking Assist (Rear View Monitor) 26-12. . . . . . . . . . . . . . . . .
Trailer Towing 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turn Signal and Hazard Warning Light 6-2. . . . . . . . . . . . . . . . . . . . . . . . . .
VSC 12-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

L
CodePart Name Part NumberCodePart Name Part Number
2004 LAND CRUISER (EWD548U)
409
R31Rear Wiper Relay90980-10797
R32Remote Control Mirror LH90980-1 1573R33Remote Control Mirror RH90980-11573
R34Room Temp. Sensor (Rear)90980-1 1918
R36Radio and Player90980-12038
R37Radio and Player90980-12183
R38Radio and Player90980-12259
R39Rear Seat Audio Controller90980-12200
R40Roll Sensing of Curtain Shield Airbags
Cutoff SW90980-10957
S 1Starter90980-1 1400
S 2Starter90980-09585
S 3Seat Heater SW (Driver's Seat)90980-10797
S 4Seat Heater SW (Front Passenger's Seat)90980-10996
S 5Stop Light SW90980-1 1118
S 6Stereo Component Amplifier90980-10848
S 7Stereo Component Amplifier90980-10807
S 8Seat Belt Warning Occupant Detection
Sensor90980-10860
S 9Seat Heater (Driver's Seat)90980-10907S10Seat Heater (Front Passenger's Seat)90980-10907
S11Side Airbag Sensor Front LH
S12Side Airbag Sensor Front RH90980-12225S13Side Airbag Sensor Rear LH90980-12225
S14Side Airbag Sensor Rear RH
S15Seat Heater (Driver's Seat Cushion)
S16Seat Heater (Front Passenger's Seat
Cushion)90980-10794
S17Seat Position Sensor90980-12195
S18Side Airbag Squib LH90980-1 1864S19Side Airbag Squib RH90980-1 1864
T 1Theft Deterrent Horn90980-10619
T 4Telescopic Motor90980-10799
T 5Theft Deterrent ECU90980-12169
T 7Tilt and Telescopic ECU90980-10799
T 8Tilt and Telescopic ECU90980-10848
T 9Tilt Motor90980-10799
T10Ignition Key Cylinder Light90980-12092T10Transponder Key Amplifier90980-12092
T11Turn Signal Flasher90980-10799
T12Trailer Socket82824-34030
T13Tweeter LH90980-1 1300T14Tweeter RH90980-1 1300
T15Towing Converter Relay90980-1 1535
T16Throttle Control Motor and Sensor90980-1 1858
T17Turbine Speed Sensor90980-1 1156
T18Towing Brake Controller90980-1 1603
T19Transponder Key Computer90980-1 1911
T20Television Camera90980-12381
T21Television Camera ECU90980-12169
T22Television Camera ECU90980-10997
T23Towing Hitch Relay82660-20340
U 1Unlock Warning SW90980-10860
V 1Vapor Pressure Sensor90980-1 1143V 2Vehicle Speed Sensor (Combination Meter)90980-1 1143
V 3Vehicle Speed Sensor (Electronically
Controlled Transmission)
90980-1 1156
V 4VSV (EVAP)
90980 1 1156
V 6Vanity Light LH90980-1 1918V 7Vanity Light RH90980-1 1918
V 8VSC Warning Buzzer90980-10906
V 9VSV (Canister Closed Valve)90980-1 1162
V10VSV (Pressure Switching Valve)90980-1 1859
W 1Washer Motor90980-1 1294
W 4Woofer (Speaker)90980-10795
Y 1Yaw Rate Sensor90980-12080
Z 1Option Connector (Glass Breakage Sensor)90980-10825

2004 LAND CRUISER (EWD548U)
11 8Engine Control
The engine control system utilizes a microcomputer and maintains overall control of the engine, transmission etc. An outline
of the engine control is given here.
1. Input Signals
(1) Engine coolant temp. signal circuit
The engine coolant temp. sensor detects the engine coolant temp. and has a built-in thermistor with a resistance which
varies according to the engine coolant temp. The engine coolant temp. is input into TERMINAL THW of the engine
control module as a control signal.
(2) Intake air temp. signal circuit
The intake air temp. sensor is installed in the mass air flow meter and detects the intake air temp., which is input as a
control signal to TERMINAL THA of the engine control module.
(3) Oxygen sensor signal circuit
The oxygen density in the exhaust emission is detected and is input as a control signal from the heated oxygen sensors
to TERMINALS OX1A, OX1B, OX2A, OX2B of the engine control module.
(4) RPM signal circuit
The camshaft position is detected by the camshaft position sensor and is input into TERMINAL G2+ of the engine
control module as a control signal. Also, the engine RPM is detected by the crankshaft position sensor and the signal is
input into TERMINAL NE+ of the engine control module.
(5) Throttle position sensor signal circuit
The throttle position sensor detects the throttle valve opening angle as a control signal, which is input into TERMINALS
VTA1, VTA2 of the engine control module.
(6) Vehicle speed circuit
The vehicle speed sensor (Combination meter) detects the vehicle speed, and the signal is input into TERMINAL SPD
of the engine control module via the combination meter.
(7) Battery signal circuit
Voltage is constantly applied to TERMINAL BATT of the engine control module. When the ignition SW is turned on, the
voltage for engine control module start up power supply is applied through the EFI OR ECD relay, to TERMINALS +B,
+B2 of the engine control module. The current from the IGN fuse flows to TERMINAL IGSW of the engine control
module, and voltage is constantly applied to TERMINAL +BM.
(8) Intake air volume signal circuit
The intake air volume is detected by the mass air flow meter, and is input as a control signal to TERMINAL VG of the
engine control module.
(9) Stop light SW signal circuit
The stop light SW is used to detect whether the vehicle is braking or not, and the signal is input into TERMINAL STP of
the engine control module as a control signal.
(10) Starter signal circuit
To confirm whether the engine is cranking, the voltage applied to the starter motor when the engine is cranking is
detected, and is input into TERMINAL STA of the engine control module as a control signal.
(11) Engine knock signal circuit
Engine knocking is detected by the knock sensors, and is input into TERMINALS KNK1, KNK2 of the engine control
module as a control signal.
System Outline

2004 LAND CRUISER (EWD548U)
218Electronically Controlled Transmission and A/T Indicator
Previous automatic transmissions have selected each gear shift using mechanically controlled throttle hydraulic pressure,
governor hydraulic pressure and lock-up hydraulic pressure. The electronically controlled transmission, however, electrically
controls the line pressure, throttle pressure, lock-up pressure and accumulator pressure etc. through the solenoid valve. The
electronically controlled transmission is a system which precisely controls gear shift timing and lock-up timing in response to
the vehicle's driving conditions and the engine condition detected by various sensors. It makes smooth driving possible by
shift selection for each gear which is the most appropriate to the driving conditions at that time, and by preventing downing,
squat and gear shift shock when starting off.
1. Gear Shift Operation
When driving, the engine warm up condition is input as a signal to TERMINAL THW of the engine control module from the
engine coolant temp. sensor and the vehicle speed signal from vehicle speed sensor is input to TERMINAL SP2+ of the
engine control module. At the same time, the throttle valve opening signal from the throttle position sensor is input to
TERMINALS VTA1 and VTA2 of the engine control module as throttle angle signal.
Based on these signals, the engine control module selects the best shift position for the driving conditions and sends current
to the electronically controlled transmission solenoid.
2. Line Hydraulic Pressure Control
The engine control module adjusts the line hydraulic pressure to the optimal level by controlling TERMINAL SLT+ of the
module according to the engine torque data. This realizes the smooth gear shifting.
3. High Response Gear Shifting Control
The engine control module performs the high response engine torque up control to control the ignition-timing lag as well as
opening the electronic throttle when shifting down. By doing this, the gear shifting is performed in a short period of time.
Moreover, the engine control module uses the orifice switching control, which optimizes the speed of applying and reducing
the hydraulic pressure. And it realizes the fine shifting condition by applying and reducing hydraulic pressure slowly when
the gear shifting shock is important and quickly when the high response is required.
4. Clutch Hydraulic Pressure Control
The engine control module controls the clutch operation in the optimal timing and with the best hydraulic pressure according
to the engine torque data and the number of the clutch revolution
5. Lock-Up and Flexible Lock-Up Control
The engine control module carries out the lock-up control by controlling the TERMINAL SLU+ of the module according to
the shift position, vehicle speed, throttle opening degree and running conditions. The engine control module also steadily
keeps applying the lock-up clutch a delicate slippage to improve the transmission efficiency (Fuel efficiency) of the torque
converter.
6. Stop Light SW Circuit
If the brake pedal is depressed (Stop light SW on) when driving in lock-up condition, a signal is input to TERMINAL STP of
the engine control module. The engine control module operates and cuts the current to the solenoid to release lock-up.
7. Ai-Shift Control
The engine control module judges whether the road is downslope or upslope by detecting the throttle opening degree or the
vehicle's speed. Moreover it can expect the winding roads by detecting the turning condition of the vehicle. The engine
control module keeps unnecessary shifting up from the fourth gear from operating and carries out the automatic shifting
down to the third gear in order to control the vehicle running according to the road conditions. The engine control module
also reads the driver's intention during driving from his (her) accelerating operation and the running conditions of the vehicle.
As a result of that, ideal shifting patters for each driver are automatically selected without any switching operations.
8. Electronically Controlled Transmission Pattern Select SW Circuit
When the electronically controlled transmission pattern select SW is switched to PWR, a signal is input to TERMINAL PWR
of the engine control module. This enables shift-up and shift-down at a higher speed range.
9. Transfer Shift Operation
When the transfer shift lever is moved to L position, a signal is input into TERMINAL L4 of the engine control module.
In addition when the transfer shift lever is moved to N position a signal is input to engine control module TERMINAL TFN.
The engine control module detects the transfer condition through this.
System Outline

2004 LAND CRUISER (EWD548U)
225
The cruise control system is a constant vehicle speed controller which controls the opening angle of the engine throttle valve
by the SW, and allows driving at a constant speed without depressing the accelerator pedal.
Set Operation
When the ON-OFF SW is turned on, the systems starts preparations for cruise control and turns on the indicator light in the
combination meter.
Set Speed Control
When the - SET SW is operated with the ON-OFF SW turned on during driving, the speed is controlled at a constant speed.
Coast Control
When the - SET SW is kept turned on during cruise control driving, the engine control module controls the throttle valve to
decelerate the vehicle speed.
Every time the - SET SW is turned on instantaneously, the vehicle speed is decelerated approx. 1.5 km/h.
Accel Control
When the + RES SW is kept turned on during cruise control driving, the engine control module controls the throttle valve to
accelerate the vehicle speed.
Every time the + RES SW is turned on instantaneously, the vehicle speed is accelerated approx. 1.5 km/h.
Resume Control
If the vehicle speed is within the low speed limit (Approx. 40 km/h, 25 mph) when canceling the cruise control, operation of
the + RES SW accelerates the vehicle speed and resumes the level before canceling the cruise control.
Manual Cancel Mechanism
If any of the following signals are input during cruise control driving, the cruise control is canceled.
*The stop light SW is on
*The CANCEL SW is turned on
*The ON-OFF SW is turned off
Auto Cancel Function
If any of the following conditions are detected, the cruise control is canceled:
*Failure in the stop light SW wiring
*Abnormality in the vehicle speed signal
*Malfunction in the electronically controlled throttle parts
Overdrive Function
The overdrive may be canceled if the vehicle travels on a upward slope during cruise control driving. After the overdrive is
canceled, if the vehicle speed exceeds the overdrive return speed (Set speed ( 2 km/h, 1.2 mph) ) and it is determined that
the slope has finished, and the vehicle returns to overdrive mode again.
E7 (C), E8 (D), E9 (E) Engine Control Module
BATT-E1 : Always 9.0-14.0 volts
IGSW-E1 : 9.0-14.0 volts with ignition SW at ON or ST position
STP-E1 : 7.5-14 volts with brake pedal is depressed
: Below 1.5 volts with brake pedal is released
C18 Combination SW
5-4 : Approx. 1540 W with CANCEL SW on
: Approx. 240 W with + RES SW on
: Approx. 630 W with - SET SW on
: Parts Location
CodeSee PageCodeSee PageCodeSee Page
A1470D770G470
A4570E5A70J1471
C12A70E6B70P169
C15D70E7C70S571
C1870E8D70T1669
D168E9E70V269
System Outline
Service Hints

2004 LAND CRUISER (EWD548U)
257
In this system, the HALL IC in the moon roof control ECU detects the changes in motor rotation, and allows opening/closing,
tilting up/down of the moon roof by one touch operation.
In addition, catching prevention function during moon roof operation is also provided.
Voltage is constantly applied from the SUN ROOF fuse to the moon roof control ECU TERMINAL 5 of the moon roof control
ECU.
When the ignition SW is turned on, the current flows from the ECU-IG1 fuse to TERMINAL 8 of the moon roof control ECU.
1. Slide Open Operation
When the moon roof control SW is kept pressed to OPEN position for approx. 0.3 seconds or longer (Limit SW No.1 off, limit
SW No.2 on), a signal is input from the moon roof control SW TERMINAL 5 to the moon roof control ECU TERMINAL 9. This
activates the moon roof control ECU and rotates the motor to open the moon roof automatically. However, in case of
pressing the moon roof control SW for 0.3 seconds or less, the moon roof can be operated manually. Then, when the limit
SW No.1 is turned on and then turned off again, the pulse signal sent from the HALL IC activates the moon roof control ECU,
and determines that the moon roof is fully open, and stops the motor. If other operation SW or the open SW is operated while
the moon roof is being opened, the moon roof control ECU is activated to stop the moon roof operation. In addition, when the
moon roof is tilted up, the slide open operation does not function.
2. Slide Close Operation
When the moon roof control SW is kept pressed to CLOSE position for approx. 0.3 seconds or longer (Limit SW No.1 off,
limit SW No.2 off), a signal is input from the moon roof control SW TERMINAL 4 to the moon roof control ECU TERMINAL
10. This activates the moon roof control ECU and rotates the motor to close the moon roof automatically. However, in case of
pressing the moon roof control SW for 0.3 seconds or less, the moon roof can be operated manually. Then, when the limit
SW No.2 is turned on, the pulse signal sent from the HALL IC activates the moon roof control ECU, and determines that the
moon roof is closed fully, and stops the motor. If other operation SW or the close SW is operated while the moon roof is
being closed, the moon roof control ECU is activated to stop the moon roof operation.
3. Tilt Up Operation
When the moon roof control SW is kept pressed to UP position for approx. 0.3 seconds or longer (Limit SW No.1 off, limit SW
No.2 on), a signal is input from the moon roof control SW TERMINAL 1 to the moon roof control ECU TERMINAL 4. This
activates the moon roof control ECU and rotates the motor to tilt up the moon roof automatically. If the pulse signal is not
input from the HALL IC for 0.5 seconds or longer, it determines that the moon roof is fully tilted up, and stops the motor. If
other operation SW or the tilt up SW is operated while the moon roof is being tilted up, the moon roof control ECU is
activated to stop the moon roof operation. In addition, when the moon roof is opened, the tilt up operation does not function.
4. Tilt Down Operation
When the moon roof control SW is kept pressed to DOWN position for approx. 0.3 seconds or longer (Limit SW No.1 on, limit
SW No.2 on), a signal is input from the moon roof control SW TERMINAL 2 to the moon roof control ECU TERMINAL 3. This
activates the moon roof control ECU and rotates the motor to tilt down the moon roof automatically.
Then, when the limit SW No.1 is turned off, the pulse signal sent from the HALL IC activated the moon roof control ECU, and
determines that the moon roof is closed fully, and stops the motor.
If other operation SW or the tilt down SW is operated while the moon roof is being tilted down, the moon roof control ECU is
activated to stop the moon roof operation.
5. Catching Prevention Function
During slide close or tilt down operation, if the moon roof control ECU detects a catching load from the changes in the
rotation of the motor, the operation is stopped, and the motor is rotated in the reverse direction.
*Slide close operation
The moon roof is moved approx. 200 mm in the reverse direction (Slide open) after a catching load has been detected.
However, if the full open position is detected before moving approx. 200 mm, the reverse movement is stopped.
*Tilt down operation
If a catching load is detected, the moon roof is moved in the reverse direction until fully tilted up.
6. Key Off Moon Roof Operation
Within approx. 43 seconds after the ignition SW is turned from on to off, the moon roof can be operated. However, if the
driver or front passenger door is opened during this period of time, the moon roof operation is stopped even though 43
seconds have not elapsed.
7. Fail-Safe Function
If the moon roof is operated continuously in the same direction, the current flowing to the motor is cut off when the time
shown below has elapsed after the motor operation has been started.
*Slide open/close operation by the moon roof SW approx. 20 seconds
*Tilt up/down operation by the moon roof SW approx. 2 second
*Slide open operation for reverse movement in case of catching prevention function approx. 20 seconds
*Tilt up operation for reverse movement in case of catching prevention function approx. 2 seconds
System Outline

2004 LAND CRUISER (EWD548U)
93 SYSTEM CIRCUITS H
2004 LAND CRUISER
ELECTRICAL WIRING DIAGRAM
SYSTEM CIRCUITS
Page
Air Conditioning (Front) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
356
Air Conditioning (Rear) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366
Auto Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322
Automatic Glare-Resistant EC Mirror with Compass . . . . . . . . . . . . . . . . . . . 304
Automatic Light Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Back-Up Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Center Differential Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246
Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Cigarette Lighter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Combination Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
Cruise Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
Door Lock Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
Electronically Controlled Transmission and A/T Indicator . . . . . . . . . . . . . . . 212
Engine Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Engine Immobiliser System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Front Fog Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Front Wiper and Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Garage Door Opener . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Headlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Illumination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Interior Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Key Reminder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316
Light Auto Turn Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Mirror Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314
Moon Roof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256
Multi-Display (w/o Navigation System) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348
Multiplex Communication System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Multiplex Communication System (Communication Bus) . . . . . . . . . . . . . . . 168
Navigation System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336
Power Outlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Power Rear Quarter Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306
Power Seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294
Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Power Tilt and Power Telescopic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298
Power Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
Radio and Player (w/ Navigation System) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324
Radio and Player (w/o Navigation System) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330
Rear Window Defogger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312
Rear Wiper and Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Remote Control Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302
Seat Belt Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 320
Seat Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308
Shift Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
SRS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Stop Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Taillight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Theft Deterrent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282
TOYOTA Parking Assist (Rear View Monitor) . . . . . . . . . . . . . . . . . . . . . . . . . . . 336
Trailer Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Turn Signal and Hazard Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
VSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
Wireless Door Lock Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270

V07268
VIBRATION METHOD: When vibration seems to be the major cause.
CONNECTORS
WIRE HARNESS
PARTS AND SENSOR1
Slightly shake the connector vertically and horizontally.
Slightly shake the wire harness vertically and horizontally.
The connector joint, fulcrum of the vibration, and body
through portion are the major areas to be checked thorough-
ly.
Apply slight vibration with a finger to the part of the sensor
considered to be the problem cause and check that the mal-
function occurs.Shake Slightly
Swing Slightly
Vibrate Slightly
HINT:
Applying strong vibration to relays may result in open relays. IN-30
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
30 Author
: Date
:
2004 LAND CRUISER (RM1071U)
3. SYMPTOM SIMULATION
The most difficult case in troubleshooting is when there are no problem symptoms occurring. In such cases,
a thorough customer problem analysis must be carried out, then simulate the same or similar conditions and
environment in which the problem occurred in the customer's vehicle. No matter how much experience a
technician has, or how skilled he may be, if he proceeds to troubleshoot without confirming the problem
symptoms he will tend to overlook something important in the repair operation and make a wrong guess
somewhere, which will only lead to a standstill. For example, for a problem which only occurs when the en-
gine is cold, or for a problem which occurs due to vibration caused by the road during driving, etc., the prob-
lem can never be determined so long as the symptoms are confirmed with the engine hot condition or the
vehicle at a standstill. Since vibration, heat or water penetration (moisture) is likely cause for problem which
is difficult to reproduce, the symptom simulation tests introduced here are effective measures in that the ex-
ternal causes are applied to the vehicle in a stopped condition.
Important Points in the Symptom Simulation Test:
In the symptom simulation test, the problem symptoms should of course be confirmed, but the problem area
or parts must also be found out. To do this, narrow down the possible problem circuits according to the symp-
toms before starting this test and connect a tester beforehand. After that, carry out the symptom simulation
test, judging whether the circuit being tested is defective or normal and also confirming the problem symp-
toms at the same time. Refer to the problem symptoms table for each system to narrow down the possible
causes of the symptom.