power steering TOYOTA LAND CRUISER 1986 Factory Service Manual

DI23B-1 1
F05526
Tilt and Telescopic ECUTelescopic Motor
Manual SwitchTilt Motor
- DIAGNOSTICSPOWER TILT AND POWER TELESCOPIC STEERING
COLUMNDI-661
854 Author
: Date
:
2004 LAND CRUISER (RM1071U)
PARTS LOCATION

F05340
TOYOTA Hand-held Tester
DLC3
DI239-15
N09214
DLC3 DI-658
- DIAGNOSTICSPOWER TILT AND POWER TELESCOPIC STEERING
COLUMN
851 Author
: Date
:
2004 LAND CRUISER (RM1071U)
PRE-CHECK
1. DESCRIPTION
(a) DIAGNOSIS SYSTEM
When troubleshooting Multiplex OBD (M-OBD) vehicles,
the only difference from the usual troubleshooting proce-
dure is that you connect the TOYOTA hand-held tester
to vehicle, and read off various data output from the ve-
hicle's Power Tilt and Telescopic Steering ECU.
The Power Tilt and Telescopic Steering ECU records the
applicable DTCs when the computer detects a malfunc-
tion in the computer itself or its circuit.
To check the DTCs, connect a TOYOTA hand-held tester
to DLC3 on the vehicle. The TOYOTA hand-held tester
enables you to erase the DTCs and activate the several
actuators and check freeze frame data and various forms
on steering data.
(b) DATA LINK CONNECTOR 3 (DLC3)
The Power Tilt and Telescopic Steering ECU uses ISO
14230 for communication. The terminal arrangement of
DLC3 complies with SAE J1962 and matches the ISO
14230 format.
Terminal No.ConnectionVoltage or ResistanceCondition
7Bus + LinePulse generationDuring transmission
4Chassis Grounde Body Ground 1 W or lessAlways
5Signal Grounde Body Ground 1 W or lessAlways
16Battery Positivee Body Ground 9 - 14 VAlways
HINT:
If your display shows ºUNABLE TO CONNECT TO VEHICLEº
when you have connected the cable of TOYOTA hand-held
tester to DLC3, turned the ignition switch ON and operated the
TOYOTA hand-held tester, there is a problem on the vehicle
side or tester side.

If communication is normal when the tester is connected
to another vehicle, inspect DLC3 on the original vehicle.

If communication is still not possible when the tester is
connected to another vehicle, the problem is probably in
the tester itself, so consult the Service Department listed
in the tester's Operator's Manual.

F05340
TOYOTA Hand-held Tester
DLC3
- DIAGNOSTICSPOWER TILT AND POWER TELESCOPIC STEERING
COLUMNDI-659
852 Author
: Date
:
2004 LAND CRUISER (RM1071U)
2. DIAGNOSIS INSPECTION
(a) Check the DTC.
(1) Prepare the TOYOTA hand-held tester.
(2) Connect the TOYOTA hand-held tester to DLC3 at
the lower of the instrument panel.
(3) Turn the ignition switch ON and turn the TOYOTA
hand-held tester switch ON.
(4) Use the TOYOTA hand-held tester to check the
DTCs and freeze frame data, note or print them
(See the Operator's Manual for operating instruc-
tions.).
(5) See page DI-660 to confirm the details of the DTC.
(b) Clear the DTC.
The following actions will erase the DTC and freeze frame
data.

When using the TOYOTA hand-held tester:
Operating the TOYOTA hand-held tester to erase
the DTCs (See the Operator's Manual for operating
instructions.).

When not using the TOYOTA hand-held tester:
Disconnecting the battery terminals.

DI23D-13
- DIAGNOSTICSPOWER TILT AND POWER TELESCOPIC STEERING
COLUMNDI-663
856 Author
: Date
:
2004 LAND CRUISER (RM1071U)
PROBLEM SYMPTOMS TABLE
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
The table below will be useful for you in troubleshooting these electrical systems. The most likely causes
of the malfunction are shown in the order of their probability. Inspect each part in the order shown, and re-
place the part when it is found to be faulty.
If the instruction ºProceed to next circuit inspection shown on the chartº is given in the flow chart
for each circuit, proceed to the circuit with the next highest number in the table to continue the
check.
If the problem still occurs even though there are no abnormalities in any of the other circuits, then
check and replace ECU.
SymptomSuspect AreaSee page
Both tilt and telescopic:
Manual, auto away/return and memory functions
 Do not operate
 Stop part way
 Do not stop
1. Multiplex communication system
2. ECU power source circuit
3. Key unlock warning switch
4. Body ECU
5. Actuator power source circuit
6. Sensor power source circuit
7. Tilt motor circuit
8. Telescopic motor circuit
9. Tilt and telescopic ECU-
DI-673
BE-29
DI-1038
DI-676
DI-679
DI-681
DI-684
IN-36
Tilt only:
Manual, auto away/return and memory functions
 Do not operate
 Stop part way
 Do not stop1. Multiplex communication system
2. Sensor power source circuit
3. Tilt motor circuit
4. Tilt and telescopic ECU-
DI-679
DI-681
IN-36
Telescopic only:
Manual, auto away/return and memory functions
 Do not operate
 Stop part way
 Do not stop1. Multiplex communication system
2. Sensor power source circuit
3. Telescopic motor circuit
4. Tilt and telescopic ECU-
DI-679
DI-684
IN-36
Both tilt and telescopic:
Only tilt and telescopic manual switch function does not operate
1. Multiplex communication system
2. Tilt and telescopic manual switch circuit
3. Tilt motor circuit
4. Telescopic motor circuit
5. Tilt and telescopic ECU-
DI-687
DI-681
DI-684
IN-36
Tilt only:
Only tilt and telescopic manual switch function does not operate
1. Multiplex communication system
2. Tilt and telescopic manual switch circuit
3. Tilt motor circuit
4. Tilt and telescopic ECU-
DI-687
DI-681
IN-36
Telescopic only:
Only tilt and telescopic manual switch function does not operate
1. Multiplex communication system
2. Tilt and telescopic manual switch circuit
3. Telescopic motor circuit
4. Tilt and telescopic ECU-
DI-687
DI-684
IN-36

DI-664- DIAGNOSTICSPOWER TILT AND POWER TELESCOPIC STEERING
COLUMN
857 Author
: Date
:
2004 LAND CRUISER (RM1071U)Symptom
Suspect AreaSee page
Both away and return:
Only auto away/return function does not operate
1. Check status of auto away function using TOYOTA
hand-held tester
2. Multiplex communication system
3. Ignition switch
4. Key unlock warning switch
5. Tilt motor circuit
6. Telescopic motor circuit
7. Tilt and telescopic ECU
-
-
BE-29
BE-29
DI-681
DI-684
IN-36
Only away:
Only Auto away/return function does not operate
1. Multiplex communication system
2. Key unlock warning switch
3. Ignition switch
4. Tilt motor circuit
5. Telescopic motor circuit
6. Tilt and telescopic ECU-
BE-29
BE-29
DI-681
DI-684
IN-36
Only return:
Only auto away/return function does not operate
1. Multiplex communication system
2. Key unlock warning switch
3. Ignition switch
4. Tilt motor circuit
5. Telescopic motor circuit
6. Tilt and telescopic ECU-
BE-29
BE-29
DI-681
DI-684
IN-36

DI23C-14
F05341
1
1 3
8 2
2
9 3 4
10 11 12 13 14 15 16765
4 5 6 87
T7T8
DI-662- DIAGNOSTICSPOWER TILT AND POWER TELESCOPIC STEERING
COLUMN
855 Author
: Date
:
2004 LAND CRUISER (RM1071U)
TERMINALS OF ECU
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
IG (T7 4) GND (T7 6)BW WBIG switch ON10 - 14 (DC)IG (T7-4) - GND (T7-6)B-W - W-BIG switch LOCKBelow 1 (DC)
VC (T7-2) - GND (T7-6)V - W-BAlways4.5 - 5.5 (DC)
GND (T7-6) - Body GroundW-B -
Body GroundAlwaysBelow 1 (DC)
ECUB (T7-1) - Body GroundL-W -
Body GroundAlways10 - 14 (DC)
ECUB (T7-1) - GND (T7-6)L-W - W-BAlways10 - 14 (DC)
Tilt up by manual switch1.30 - 1.70 (DC)
Tilt down by manual switch0.30 - 0.50 (DC)
MSW (T7-5) - GND (T7-6)V-Y - W-BTelescopic extended by manual switch2.05 - 2.75 (DC)MSW (T7 5) GND (T7 6)VY WB
Telescopic contracted by manual switch0.65 - 0.95 (DC)
Manual switch is not operatingBelow 0.20 (DC)
+B (T8-4) - GND (T7-6)G-B - W-BAlways10 - 14 (DC)
S5V1 (T8-13) - SG1 (T8-14)G-W - G-YIG switch ON4.5 - 5.5 (DC)
S5V2 (T8-12) - SG2 (T8-10)B-W - B-YIG switch ON4.5 - 5.5 (DC)
A1 (T8-7) - COM1 (T8-15)P - GIG switch ON, tilt up or down by manual switch190 - 230 (AC)
B1 (T8-16) - COM1 (T8-15)V - GIG switch ON, tilt up or down by manual switch190 - 230 (AC)
A2 (T8-1) - COM2 (T8-9)W - BIG switch ON, telescopic extend or contracted by manual switch190 - 230 (AC)
B2 (T8-8) - COM2 (T8-9)G - BIG switch ON, telescopic extend or contracted by manual switch190 - 230 (AC)

DI-704
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
897 Author
: Date
:
2004 LAND CRUISER (RM1071U)B1183/22
(DI-898)

Short in D squib (2nd step) circuit
(to B+)
Steering wheel pad (D squib, 2nd step)

Spiral cable

Airbag sensor assembly

Dash wire

Column wire
ON
B1185/57
(DI-903)
Short in P squib (2nd step) circuit
Front passenger airbag assembly (squib)

Airbag sensor assembly

Dash wire
ON
B1186/58
(DI-907)
Open in P squib (2nd step) circuit
Front passenger airbag assembly (squib)

Airbag sensor assembly

Dash wire
ON
B1187/55
(DI-910)
Short in P squib (2nd step) circuit
(to ground)
Front passenger airbag assembly (squib)

Airbag sensor assembly

Dash wire
ON
B1188/56
(DI-913)
Short in P squib (2nd step) circuit
(to B+)
Front passenger airbag assembly (squib)

Airbag sensor assembly

Dash wire
ON
B1628/29
(*1)
(DI-913)
RSCA cutoff switch indicator
RSCA cutoff switch

Airbag sensor assembly

Dash wire

Instrument panel wire
Blink
Nl
System normal-OFFNormal
(DI-923)
Voltage source drop
Battery

Airbag sensor assemblyON
*1: w/ Side Airbag
HINT:

When the SRS warning light remains lit up and the DTC is the normal code, a voltage source drop is
possible.
This malfunction is not stored in memory by the airbag sensor assembly and if the power source volt-
age returns to normal, the SRS warning light will automatically go out.

When 2 or more codes are indicated, smaller numbered code will be shown first.

If a code not listed on the chart is displayed, the airbag sensor assembly is at fault.

In the case of any malfunction concerning any open circuit, ground short, or B+ short due to any squib,
another malfunction code may not be detected. In this case, correct the malfunction currently indicated
and then perform malfunction diagnosis again. Another malfunction code may then be detected.

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)
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)
300Power Tilt and Power Telescopic
This system provides the automatic tilt and telescopic mechanisms using the motor drive, tilt and telescopic ECU control,
allowing variable steering movement in the back and forth, and vertical directions. This makes it possible to set the steering
to the desired steering position.
T7 (A), T8 (B) Tilt and Telescopic ECU
(A) 1-Ground : Always approx. 12 volts
(B) 4-Ground : Always approx. 12 volts
(A) 4-Ground : Approx. 12 volts with ignition SW at ON or ST position
(A) 6-Ground : Always continuity
C17 Combination SW
16-8 : Approx. 160 W with telescopic long operation
: Approx. 360 W with tilt up operation
: Approx. 790 W with telescopic short operation
: Approx. 1.99 kW with tilt down operation
: Parts Location
CodeSee PageCodeSee PageCodeSee Page
B770J171T8B71
C1770T471T971
C2670T7A71
: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)
2Q30Instrument Panel Integration Wire and Cowl Side J/B LH (Left Kick Panel)
3D40Dash Wire and Cowl Side J/B RH (Right Kick Panel)3F40Dash Wire and Cowl Side J/B RH (Right Kick Panel)
3Q42Instrument Panel Integration Wire and Cowl Side J/B RH (Right Kick Panel)
:Connector Joining Wire Harness and Wire Harness
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
II380Dash Wire and Column Wire (Near the Ignition SW)II580Dash Wire and Column Wire (Near the Ignition SW)
:Ground Points
CodeSee PageGround Points Location
II78Set Bolt of Cowl Side J/B RH
:Splice Points
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
I980Column Wire
System Outline
Service Hints