TOYOTA LAND CRUISER 1998 Factory Repair Manual

2004 LAND CRUISER (EWD548U)
234VSC
1. ABS Operation
If the brake pedal is depressed suddenly, the ABS controls the hydraulic pressure of the wheel cylinders for all the four
wheels to automatically avoid wheel locking and ensure the directional and steering stability of the vehicle. If the brake pedal
is depressed suddenly, the ABS & BA & TRAC & VSC ECU controls the solenoids in the actuators using the signals from the
sensors to move the brake fluid to the reservoir in order to release the braking pressure applied to the wheel cylinder. If the
ABS & BA & TRAC & VSC ECU detects that the fluid pressure in the wheel cylinder is insufficient, the ECU controls the
solenoids in the actuators to increase the braking pressure.
2. Traction Control Operation
The traction control system controls the engine torque, the hydraulic pressure of the driving wheel cylinders, slipping of the
wheels which may occur at start or acceleration of the vehicle, to ensure an optimal driving power and vehicle stability
corresponding to the road conditions.
3. VSC Operation
Unexpected road conditions, vehicle speed, emergency situation, and any other external factors may cause large under- or
over-steering of the vehicle. If this occurs, the VSC system automatically controls the engine power and wheel brakes to
reduce the under- or over-steering.
To reduce large over-steering :
If the VSC system determines that the over-steering is large, it activates the brakes for the outer turning wheels depending
on the degree of the over-steering to produce the moment toward the outside of the vehicle and reduce the over-steering.
To reduce large under-steering :
If the VSC system determines that the under-steering is large, it controls the engine power and activates the rear wheel
brakes to reduce the under-steering.
VSC indicator light
If an error occurs in the VSC system, the VSC indicator lights up to warn the driver.
4. Traction Mode and VSC Function
When the center differential of the transfer is locked, the VSC function is turned off. At this time, the VSC OFF indicator light
in the combination meter will come on, and informs the driver that the VSC function is OFF.
5. Mutual System Control
To efficiently operate the VSC system at its optimal level, the VSC system and other control systems are mutually controlled
while the VSC system is being operated.
Engine throttle control
The engine power does not interfere with the VSC brake control by controlling the opening of the throttle and reducing the
engine output.
Engine control and electronically controlled transmission control
The strong braking force does not interfere with the braking force control of the VSC system by turning off the accel. and
reducing changes in the driving torque at shift-down.
VSC system operation indication
The slip indicator light flashes and the buzzer sounds intermittently to warn the driver that the current road is slippery, while
the VSC system is being operated.
6. Fail Safe Function
If an error occurs in the ABS & BA & TRAC & VSC ECU, sensor signals, and/or actuators, the ABS & BA & TRAC & VSC
ECU inhibits the brake actuator control and inputs the error signal to the engine control module. According to the error signal,
the brake actuator turns off the solenoid and the engine control module rejects any electronically controlled throttle open
request from the VSC system. As a result, the vehicle functions without the ABS, BA, TRAC, and VSC systems.
System Outline

2004 LAND CRUISER (EWD548U)
235
A41 (A), A42 (B), A44 (D) ABS & BA & TRAC & VSC ECU
(D)15-Ground : Always approx. 12 volts
(B) 6-Ground : Approx. 12 volts with ignition SW at ON or ST position
(D)22-Ground : Approx. 12 volts with ignition SW at ON or ST position
(B)10-Ground : Approx. 12 volts with brake pedal depressed
(A) 6, (A) 31, (B) 8, (B) 17-Ground : Always continuity
A12 ABS Speed Sensor Front LH
2-4 : Approx. 1.07 kW (20 °C, 68 °F)
A13 ABS Speed Sensor Front RH
1-2 : Approx. 1.07 kW (20 °C, 68 °F)
A35, A36 ABS Speed Sensor Rear LH, RH
1-2 : Approx. 1.2 kW (25 °C, 77 °F)
: Parts Location
CodeSee PageCodeSee PageCodeSee Page
A1268A42B70D770
A1368A43C70E970
A3572A44D70J271
A3672C12A70M469
A37A68C13B70P169
A38B68C14C70P873
A39C68C15D70S571
A40D68C1770V871
A41A70D168Y171
:Relay Blocks
CodeSee PageRelay Blocks (Relay Block Location)
122Engine Room R/B (Engine Compartment Left)
:Junction Block and Wire Harness Connector
CodeSee PageJunction Block and Wire Harness (Connector Location)
2A28Engine Room No 2 Wire and Cowl Side J/B LH (Left Kick Panel)2B28Engine Room No.2 Wire and Cowl Side J/B LH (Left Kick Panel)
2D28Dash Wire and Cowl Side J/B LH (Left Kick Panel)
2K28Floor No.1 Wire and Cowl Side J/B LH (Left Kick Panel)
2Q30Instrument Panel Integration Wire and Cowl Side J/B LH (Left Kick Panel)
3A40Engine Room No 2 Wire and Cowl Side J/B RH (Right Kick Panel)3B40Engine Room No.2 Wire and Cowl Side J/B RH (Right Kick Panel)
3E40Dash Wire and Cowl Side J/B RH (Right Kick Panel)
3Q42Instrument Panel Integration Wire and Cowl Side J/B RH (Right Kick Panel)
5C56Dash Wire and J/B No.5 (Behind the Combination Meter)
5D56Engine Room No.2 Wire and J/B No.5 (Behind the Combination Meter)
6C60Dash Wire and J/B No.6 (Behind the Grove Box)
6D60Engine Wire and J/B No.6 (Behind the Grove Box)
7B64Dash Wire and J/B No.7 (Behind the Grove Box)
7D64Engine Room No.2 Wire and J/B No.7 (Behind the Grove Box)
Service Hints

2004 LAND CRUISER (EWD548U)
236VSC
:Connector Joining Wire Harness and Wire Harness
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IA278Engine Room No.2 Wire and Floor No.1 Wire (Left Kick Panel)
IG178Engine Room No 2 Wire and Dash Wire (Behind the Combination Meter)IG478Engine Room No.2 Wire and Dash Wire (Behind the Combination Meter)
IH280Instrument Panel Integration Wire and Column Wire (Near the Ignition SW)
II380Dash Wire and Column Wire (Near the Ignition SW)
IN280Engine Wire and Dash Wire (Behind the Glove Box)
IU482Instrument Panel Integration Wire and Dash Wire (Behind the Glove Box)
IX182Instrument Panel Integration Wire and Engine Wire (Behind the Glove Box)
Ib284Dash Wire and Dash Wire (Behind the Combination Meter)
BD386Floor No.3 Wire and Floor No.1 Wire (Left Rear Side Quarter Panel)
BF286Frame Wire and Floor No.3 Wire (Left Side of Rear Floor Crossmember)
:Ground Points
CodeSee PageGround Points Location
EC76Rear Bank of Right Cylinder Head
EE76Front Left Side of Fender Apron
IF78Set Bolt of Cowl Side J/B LH
:Splice Points
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
E1376Engine Room No 2 WireI280Engine Room No.2 Wire
E1476Engine Room No.2 Wire

2004 LAND CRUISER (EWD548U)
237 SRS
NOTICE: When inspecting or repairing the SRS, perform the operation in accordance with the following precautionary
instructions and the procedure and precautions in the Repair Manual for the applicable model year.

Malfunction symptoms of the SRS are difficult to confirm, so the DTCs become the most important source of information
when troubleshooting. When troubleshooting the SRS, always inspect the DTCs before disconnecting the battery.

Work must be started after 90 seconds from when the ignition switch is turned to the ºLOCKº position and the
negative (-) terminal cable is disconnected from the battery.
(The SRS is equipped with a back-up power source so that if work is started within 90 seconds from
disconnecting the negative (-) terminal cable of the battery, the SRS may be deployed.)

When the negative (-) terminal cable is disconnected from the battery, the memory of the clock and audio system will be
canceled. So before starting work, make a record of the contents memorized in the audio memory system. When work is
finished, reset the audio systems as they were before and adjust the clock. This vehicle has power tilt and power
telescopic steering, power seat and power outside rear view mirror which are all equipped with memory function.
However, it is not possible to make a record of the memory contents. So when the work is finished, it will be necessary
to explain this fact tot the customer, and ask the customer to adjust the features and reset the memory. To avoid erasing
the memory in each memory system, never use a back-up power supply from outside the vehicle.

Before repairs, remove the airbag sensor if shocks are likely to be applied to the sensor during repairs.

Do not expose the steering wheel pad, front passenger airbag assembly, side airbag assembly, curtain shield airbag
assembly, seat belt pretensioner, center airbag sensor assembly, front airbag sensor assembly or side airbag sensor
assembly directly to hot air or flames.

Even in cases of a minor collision where the SRS does not deploy, the steering wheel pad, front passenger airbag
assembly, side airbag assembly, curtain shield airbag assembly, seat belt pretensioner, center airbag sensor assembly,
front airbag sensor assembly and side airbag sensor assembly should be inspected.

Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.

Never disassemble and repair the steering wheel pad, front passenger airbag assembly, side airbag assembly, curtain
shield airbag assembly, seat belt pretensioner, center airbag sensor assembly, front airbag sensor assembly or side
airbag sensor assembly in order to reuse it.

If the steering wheel pad, front passenger airbag assembly, side airbag assembly, curtain shield airbag assembly, seat
belt pretensioner, center airbag sensor assembly, front airbag sensor assembly or side airbag sensor assembly has
been dropped, or if there are cracks, dents or other defects in the case, bracket or connector, replace them with new
ones.

Use a volt/ohmmeter with high impedance (10 kW/V minimum) for troubleshooting the system's electrical circuits.

Information labels are attached to the periphery of the SRS components. Follow the instructions on the notices.

After work on the SRS is completed, perform the SRS warning light check.

If the vehicle is equipped with a mobile communication system, refer to the precaution in the IN section of the Repair
Manual.

2004 LAND CRUISER (EWD548U)
238SRS
RSCA OFFSRS
A 10
C 4B19 7. 5A
MET
3Q 7
C12(
A)
, C13(
B)
, C14(
C)SB
B 25
3F 2
3Q 69B 3
3F 8
3Q 11 3E11B 12
3F 1
3E 12B 19
3F 10
3E 14
J157B 7
7B 87B 4
7B 5
713 11
D 7
IH 3F 63F9 B 27 B28 A7
A 1A 8(
*1)
A 2(
*2)
21
P21 B 5 7. 5A
IGN From Power Source System (
See Page 94)
3F 3
B 20 B 9IT1 2IT11 21 A16
B 26 B 15IB1 2IB11 EF1 1EF121 2 A15
C25(
A)
, C26(
B)
, C27(
C)
B- R
W- R
BR
B- W
BR- W W- R
BR
B- W
BR- W W- R
BR
B- W
BR- W B- W
B- Y
V- W
P- B P- B V- W B- YSB SBSB SB
V- W
P- B
W- B
W- B
Y
Y- B
C
CSBIG2 +SL+SL - SL
-SL+SR - SR
+SR - SR
(
*1)
(
*1)
(
*1)
(
*1)
RMIL LA SIL TC E1 E2 PL- PL+
A/B SIL TCEA1 2 EA11 Air bag Sensor Front LH Airbag Sensor Fr ont RH
Combination Meter
Data Link Connector 3 Pretensioner LHCenter Airbag Sensor Assembly
Junction Connector

2004 LAND CRUISER (EWD548U)
239
C 10
C 6C 9
C 5
21
P22A 4
A 3A 3(
*1)
A 8(
*2)
21
S17BM2 1BM22 B 14 B13 B16 B17 1243 A28
II4 1 II42II44II43
B 10 B11 B8B7 1234 A27
A 11 A 122 1 S18
C 16 C13 C15 C17
3214A 9A10
12
Y
Y
C25(
A)
, C26(
B)
, C27(
C)
Y- B
Y
Y- V
Y- O Y- B
Y
Y- V
Y- O
Y- R
Y- G
Y- GR
Y- P
Y- R
Y- G Y
Y- B
L- R
R L- R
R
L- Y
LG
GR
P
Y- V
Y- O
D+ D- D2+ D2- P+ P- P2+ P2-
PR- PR+ LSP+ LSP-* 2 : w/o Side Airbag * 1 : w/ Side Airbag
(
*1)
(
*1)
SFL+ SFL-
S12 C29
(
*1)
(
*1)
(
*1)
(
*1)
(
*1)
(
*1)
SSR+ SSR- ESR VUPR ICL+ ICL-
SSR+ SSR- ESR VUPR
2 1 Airbag Squib (
Front Passenger Airbag Assembly)
Airbag Squib (
Steering Wheel Pad)
Pretensioner RHSide Air bag Squib LH
Curtain Shield
Air bag Squib LH Center Airbag Sensor Assembly
Side Ai rbag Sensor Front RH Seat Position
Sensor

2004 LAND CRUISER (EWD548U)
240SRS
S11
3
A 1
164 2
A 20 18 17 A AC 6 C 52 1 S19
18 4 C
320 C CC19
214C 8C7
12
Y
Y
3D 30
4E 19
143F 5
4C 4
SB G- WB B
IU1 8
IF IF1 34 3
C
2Q 43 C
(
*1) (
*1)
E 9F/ PS
S14 C30C25(
A)
, C26(
B)
, C27(
C)
G- WL- W
LG- B
GR - L
P- L
Y- R
Y- G L- W
LG- B
GR- R
L- B
Y- V
Y- O(
*1)
(
*1)
(
*1)
(
*1)
SSL+ SSL- ESL VUPL SSL+ SSL- ESL VUPLS13
3
A 1
144 2
A 113 15 A A
L- Y
LG- B
G
R (
*1)
(
*1)
(
*1)
(
*1)
CSL+ CSL- ESCL VUCL CSL+ CSL- ESCL VUCL
W- BSB
(
*1)
(
*1)
SFR+ SFR-
(
*1)
(
*1)
(
*1)
(
*1)
(
*1)
(
*1)
CSR+ CSR- ESCR VUCR ICR+ ICR-
CSR+ CSR- ESCR VUCR
(
*1) (
*1) (
*1)
12
Engine Control
Module Side Airbag Sensor Front LH Side Ai rbag Sensor Rear LH
Center Airbag Sensor AssemblySide Air bag Squib RH
Side Airbag Sensor Rear RH Curtain Shield
Airbag Squib RH
Roll Sensing of
Curtain Shield
Airbags Cutoff SW R40
B 23GSW2
B
RMSW
21 B
Ia1 1
G- W
(
*1)
SB
IF2 11
A A
SB
(
*1) (
*1)Junction
Connector J 7
Junction
Connector J12
G- W
(
*1)

2004 LAND CRUISER (EWD548U)
241
BM2 3
A 11
W- BG
W- BG
W- B GG G
C25(
A)
, C26(
B)
, C27(
C)
10 2G2K 18BU1 3 5BM2
BJ B11
BM BU1 1 4BM23
E 21
E
J22B 5
W- B W- B
W- BG
LBE+A 19(
*1)
(
*2)* 1 : w/ Side Airbag
* 2 : w/o Side Air bag
Buckle SW LH
Junction
Connector Center Airbag Sensor Assembly
DBKL 22 B
B
MPX2
(
*1)
2G 42Q 7 MPX13
T 7
Tilt and
Telescopic
ECU3D 41
B
MPX2 3F 73Q 37
BSB
SB G
GBody ECU B 7
13 23

2004 LAND CRUISER (EWD548U)
242SRS
*The SRS airbag are provided for the driver and front passenger. The SRS airbags have been designed to help reducing
the shocks to the heads and chests of the driver and front passenger in the event of a severe frontal impact collision as
supplements to the seat belts.
This system is a 3-sensor type airbag system to detect the impact during a front collision using the center airbag sensor
assembly and airbag sensor front LH, RH, and to make the airbag system and pretensioner operate as well.
*In this system, a front side collision is detected by the side airbag sensor front LH, RH in order to simultaneously deploy
the side and curtain shield airbags. A rear side collision is detected by the side airbag sensor rear LH, RH in order to
deploy only the curtain shield airbag.
*Roll sensing of curtain shield airbags control has been adopted in order to deploy the curtain shield airbags and the
pretensioners for the driver and front passenger, in the event that the vehicle rolls over.
A roll sensing of curtain shield airbags cutoff SW is provided on the driver side of the instrument panel to enable the driver
to disable this system.
*Dual-stage SRS airbags system, that controls the airbag inflating output optimum by judging the extent of impact and seat
position (Driver seat), has been used for the driver and front passenger airbags.
*In accordance with the adoption of the dual-stage SRS airbag system, a seat position sensor has been established for the
driver seat.
*This system has adopted a fuel cut control that stops the fuel pump when the airbag is deployed.
: Parts Location
CodeSee PageCodeSee PageCodeSee Page
A1568C27C70R4071
A1668C2972S1173
A2770C3072S1273
A2870D770S1373
B574E970S1473
B770J771S1774
C12A70J1271S1874
C13B70J1571S1974
C14C70J2272T771
C25A70P2173
C26B70P2273
:Junction Block and Wire Harness Connector
CodeSee PageJunction Block and Wire Harness (Connector Location)
2G28Dash Wire and Cowl Side J/B LH (Left Kick Panel)
2K28Floor No.1 Wire and Cowl Side J/B LH (Left Kick Panel)
2Q30Instrument Panel Integration Wire and Cowl Side J/B LH (Left Kick Panel)
3D
3E40Dash Wire and Cowl Side J/B RH (Right Kick Panel)
3F
(g )
3Q42Instrument Panel Integration Wire and Cowl Side J/B RH (Right Kick Panel)
4C52Dash Wire and J/B No 4 (Instrument Panel Center)4E52Dash Wire and J/B No.4 (Instrument Panel Center)
7B64Dash Wire and J/B No.7 (Behind the Grove Box)
System Outline

2004 LAND CRUISER (EWD548U)
243
:Connector Joining Wire Harness and Wire Harness
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
EA176Engine Room Main Wire and Engine Room No.2 Wire (Engine Compartment Right)
EF176Engine Room No.2 Wire and Engine Room Main Wire (Under the Engine Room J/B)
IB178Engine Room No.2 Wire and Dash Wire (Left Kick Panel)
IF178Instrument Panel Integration Wire and Instrument Panel Wire (Left Side of Instrument Panel)IF278Instrument Panel Integration Wire and Instrument Panel Wire (Left Side of Instrument Panel)
II480Dash Wire and Column Wire (Near the Ignition SW)
IT180Engine Room No.2 Wire and Dash Wire (Right Kick Panel)
IU182Instrument Panel Integration Wire and Dash Wire (Behind the Glove Box)
Ia184Dash Wire and Dash Wire (Behind the Combination Meter)
BM290Floor No.1 Wire and Front Seat LH Wire (Front Side Under the Driver's Seat)
BU188Floor No.1 Wire and Floor No.1 Wire (Near the Left Rear Suspension Support)
:Ground Points
CodeSee PageGround Points Location
IF78Set Bolt of Cowl Side J/B LH
IH78Set Bolt of Cowl Side J/B RH
BJ86Under the Driver's Seat
BM86Left Rear Side Quarter Panel
:Splice Points
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
B1188Floor No.1 Wire