Page 624 of 3115

STEERING WHEEL PAD (with Airbag)
When removing the steering wheel pad or handling a new steering wheel pad, it should be placed
with the pad top surface facing up.
In this case, the twin-lock type connector lock lever should be in the locked state and care should be
taken to place it so the connector will not be damaged. In addition do not store a steering wheel pad
on top of another one. Storing the pad with its metallic surface up may lead to a serious accident if
the airbag inflates for some reason.
Never measure the resistance of the airbag squib. (This may cause the airbag to deploy, which is
very dangerous.)
Grease should not be applied to the steering wheel pad and-the pad should not be cleaned with de-
tergents of any kind.
Store the steering wheel pad where the ambient temperature remains below 93°C (200°F), without
high humidity and away from electrical noise.
When using electric welding, first disconnect the airbag connector (yellow color and 2 pins) under the
steering column near the combination switch connector before starting work.
When disposing of a vehicle or the steering wheel pad alone, the airbag should be deployed using
an SST before disposal.
Carry out the operation in a safe place away from electrical noise.
FRONT PASSENGER AIRBAG ASSEMBLY
Always store a removed or new front passenger airbag assembly with the airbag deployment direc-
tion facing up. Storing the airbag assembly with the airbag deployment direction facing down could
cause a serious accident if the airbag inflates.
Never measure the resistance of the airbag squib.
(This may cause the airbag deploy, which is very dangerous.)
Grease should not be applied to the front passenger airbag assembly and the airbag door should not
be cleaned with detergents of any kind.
Store the airbag assembly where the ambient temperature remains below 93°C (200°F), without
high humidity and away from electrical noise.
When using electric welding, first disconnect the airbag connector (yellow color and 2 pins) installed
on the glove compartment finish plate at the left side of the glove compartment before starting work.
When disposing of a vehicle or the airbag assembly alone, the airbag should be deployed using an
SST before disposal.
Perform the operation in a safe place away from electrical noise.
SEAT BELT PRETENSIONER
Before doing any operation which will apply a strong shock to the vehicle, or before removing the
seat belt pretensioner, be sure to apply the sensor shock.
Never disassemble the seat belt pretensioner.
Do not subject the seat belt pretensioner to shocks or bring magnets close to it.
Do not expose the seat belt pretensioner to high temperature or fire.
Do not drop the seat belt pretensioner. Never use a seat belt pretensioner which has been dropped.
Never install the seat belt pretensioner in another vehicle.
Store removed seat belt pretensioners on a flat, stable surface.
After frontal collision, always check whether the seat belt pretensioners have been activated.
When disposing of a vehicle or the pretensioner by itself, always activate the pretensioner before
disposal.
The seat belt pretensioner is hot when activated, so let it cool down fully before you dispose of it.
Never apply water to the seat belt pretensioner.
INTRODUCTIONIN-7
Page 798 of 3115

DI-546- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
739 Author: Date:
2004 LAND CRUISER (RM1071U)
DTCC1231 / 31, C1335 / 35Steering Angle Sensor Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1231 / 31
Detection of any of the conditions 1. through 3.:
1. When the condition that ECU terminal IG1 voltage is 9.5
V or more, and does not receive data from steering
angle sensor continues for 1 sec. or more.
2. When the steering angle sensor value changes by 360°
or more with SSC signal from steering angle sensor
remaining ON or OFF.
3. When the condition that difference between the steering
angle value at edge occurring in SSC signal and the
value at edge occurring in SSC signal after turning the
steering wheel one-turn is out of the range from 355.5°
- 364.5° occurs 10 times or more.
Steering angle sensor
Steering angle sensor circuit
C1335 / 35
When the ECU IG1 terminal voltage is 9.5 V or more, data
transmission from the steering angle sensor is impossible
for 1 sec. or more.Steering angle sensor
Steering angle sensor circuit
DIC9J-02
Page 800 of 3115

F17609
ESS (-)
IG (+)
BAT (+)
DI-548- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
741 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the hand-held tester and start from step 2 in case of not
using the hand-held tester.
1 Check output value of the steering angle sensor.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Select the DATALIST mode on the hand-held tester.
CHECK:
Check that the steering wheel turning angle value of the steering angle position sensor displayed on the
hand-held tester is changing when turning the steering wheel.
HINT:
After certifying ºZeroº point calibration of the steering angle sensor (Speed: 21 mph (35 km/h), driving straight
ahead for 10 sec. or more), the value will change.
OK:
Steering wheel turning angle value must be changing.
OK Go to step 5.
NG
2 Check input voltage of the steering angle sensor.
PREPARATION:
Remove the column lower cover.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals 1 and 2, 2 and 9 of
the combination switch wire harness side connector.
OK:
Voltage: 10 to 14 V
NG Check and replace harness and connector.
OK
Page 801 of 3115

F03003
1 2
6 3 (+)(-)
(+)
(-)
(Oscilloscope) LOCK
F04441
(Reference)
3 ms
2,288 ms
104 ms 5 V
0 V
5 V
0 V
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-549
742 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check steering angle sensor.
PREPARATION:
(a) Remove the steering wheel lower No. 2 and No. 3 covers,
steering wheel pad, steering wheel column upper and
lower covers (See page SR-29).
(b) Disconnect the combination switch connector (for steer-
ing angle sensor).
(c) Connect the oscilloscope to terminals 3 and 6 of the com-
bination switch connector (for steering angle sensor).
(d) Apply battery positive voltage between terminals 1 and 2.
CHECK:
Turn the steering wheel slowly and check the signal waveform.
OK:
HINT:
The above signal waveform does not repeat ON and OFF regu-
larly and this combination changes case by case according to
the data.
NG Replace steering angle sensor.
OK
4 Check that slits of the steering sensor disc are clogged up.
NG Repair or replace steering sensor disc.
OK
Page 802 of 3115
DI-550- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
743 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check for open and short circuit in harness and connector between steering
position sensor and ABS & BA & TRAC & VSC ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and replace ABS & BA & TRAC & VSC
ECU.
Page 860 of 3115

DI-608- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
801 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC C1290 / 66 Zero Point Calibration of Steering Sen-
sor Undone
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1290 / 66
The steering sensor zero point calibration position vastly
differs from the recorded value.
(The angle becomes larger)Yaw rate sensor zero point calibration undone
Steering angle sensor zero point calibration undone
INSPECTION PROCEDURE
1 Perform zero point calibration. (See page DI-505)
HINT:
This code is output when a problem occurs in a zero point calibration of the steering angle sensor and yaw
rate sensor.
Therefore, clear the stored zero point calibration data and correct the zero points.
(a) Clear the zero point calibration data.
(b) Perform a zero point calibration of the steering sensor and yaw rate sensor.
NEXT
2 Is DTC output?
(a) Clear the DTCs.
(b) Turn the ignition switch to the ON position.
(c) Are the same DTCs detected?
NO Proceed to next circuit inspection shown in
problem symptoms table.
YES
No problem.
HINT:
When the registered data is not equal to the input data, the DTC will be output.
DICA0-01
Page 872 of 3115

BR3795
OK NG
W04200
Normal Signal Waveform
1 V / Division2 m/s / DivisionGND
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-619
812 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Check sensor installation.
CHECK:
Check the speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between the sensor and front steering
knuckle or rear axle carrier.
Torque: 8.0 N´m (82 kgf´cm, 71 in.´lbf)
NG Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI-505).
OK
5 Check speed sensor and sensor rotor serrations.
(REFERENCE) INSPECTION USING OSCILLOSCOPE
PREPARATION:
(a) Remove the skid control ECU with connectors still con-
nected.
(b) Connect the oscilloscope to each of terminals FR+ - FR-,
FL+ - FL-, RR+ - RR- or RL+ - RL- of the skid control
ECU.
CHECK:
Drive the vehicle at about 12 mph (20 km/h), and check the sig-
nal waveform.
HINT:
As vehicle speed (rpm of the wheels) increase, a cycle of
the waveform narrows and the fluctuation in the output
voltage becomes greater.
When noise is identified in the waveform on the oscillo-
scope, error signals are generated due to the speed sen-
sor rotor's scratches, looseness or foreign matter depos-
ited on it.
OK Check and replace skid control ECU.
NG
Page 893 of 3115

Inspector 's
Name:
Customer 's Name
Date Vehicle
Brought InRegistration DateRegistration No.
Frame No.
Odometer Reading/ /
/ /
Date Problem First Occurred
Frequency Problem Occurs/ /
ContinuousIntermittent ( times a day)
TRAC does not operate. (Wheels spin when starting rapidly.)
DisplaysDoes not display
DTC Check1st Time
2nd TimeNormal Code
Malfunction Code (Code )
Normal CodeMalfunction Code (Code )
Symptomskm
miles
Light Abnormal TRAC OFF Indicator
Light Abnormal SLIP Indicator
Remains ONDoes not light up
Check Item
NormalMalfunction Code (Code )
NormalMalfunction Code (Code )
ABS Warning Light
Malfunction
Indicator Light TRAC & VSC Check Sheet
Remains ONDoes not light up
VSC does not operate. (Wheels sideslip at the time of sharp turning.)
VSC TRC Warning
Indicator Abnormal
Skid Control
Buzzer AbnormalDoes not soundSounds
VSC/TRC OFF SW
SYSTEMFreeze Frame Data
SHIFT POSITION
YAW RATON
OFF
VSC/TRC
P, NR
D
deg/s
VFAIL
23
4L
MAS CYL PRESS
THROTTLE
MAS PRESS GRADE
G (RIGHT&LEFT)
G (BACK&FORTH)
STEERING ANG
deg
deg
MPa/s
G
G DI-504
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
697 Author: Date:
2004 LAND CRUISER (RM1071U)