Steering Lock System Unable To Lock Steering Wheel


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (LOCK REQUEST RECEIVE)

INSPECT STEERING LOCK ECU

CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT CONTROL ECU)

READ VALUE USING INTELLIGENT TESTER (FL AND FR DOOR COURTESY)

READ VALUE USING INTELLIGENT TESTER (S CODE CHECK)

READ VALUE USING INTELLIGENT TESTER (L CODE CHECK)

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

CHECK STEERING LOCK RELEASE OPERATION

REPLACE ID CODE BOX

READ VALUE USING INTELLIGENT TESTER (S CODE CHECK)

REPLACE ID CODE BOX

READ VALUE USING INTELLIGENT TESTER (L CODE CHECK)

STEERING LOCK SYSTEM - Unable to Lock Steering Wheel


DESCRIPTION

The steering lock ECU sends an unlock position signal to the power management control ECU. Upon receiving the signal, the power management control ECU permits an engine start. This prevents the engine from being started with the steering locked.
The steering lock actuator activates the steering lock motor and moves the lock bar into the steering column to lock the steering wheel.
When the steering lock is operating, the steering lock may not lock when the lock bar is not aligned with the lock hole of the steering column. In this case, the steering lock can be locked by turning the steering wheel a little in the same manner as is done for a vehicle with a mechanical key to change the position of the lock hole.
The diagnosis information of the steering lock ECU is transmitted to the intelligent tester via the certification ECU as the steering lock ECU is not connected to the CAN communication system.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Steering Column.Power Tilt And Power Telescopic Steering Column System.Steering Lock System Unable To Lock Steering Wheel


INSPECTION PROCEDURE

HINT:
When the engine switch is off, the main body ECU may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following steps to wake up the ECU:
With the engine switch off, open the driver door. Then (with the engine switch still off) open and close any door several times at 1.5 second intervals.
NOTICE:
  1. If the steering lock actuator assembly (steering lock ECU) is replaced, with the engine switch off and the shift lever in P (for Automatic Transmission), open and close the driver side door to record the current lock position into the steering lock ECU. If this is not performed, the engine may not start.
  2. When replacing the steering lock ECU, ID code box or certification ECU, registration must be performed. Refer to the Service Bulletin for the registration procedure.
1.READ VALUE USING INTELLIGENT TESTER (LOCK REQUEST RECEIVE)

  1. Use the Data List to check if the steering lock command is functioning properly.

    Entry&Start
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Lock Request Receive
    		Steering lock lock command reception status/NG or OK
    		NG: Lock request not received
    OK: Lock request received
    		-
    OK:
    The certification ECU receives a lock request signal within 10 seconds of turning the engine switch from on (IG) to off and opening a door, and OK is displayed on the intelligent tester screen.


NG
Go to step 4
OK


2.INSPECT STEERING LOCK ECU

  1. Move the shift lever to P.*

    1. *: for Automatic Transmission


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Steering Column.Power Tilt And Power Telescopic Steering Column System.Steering Lock System Unable To Lock Steering Wheel

  1. Measure the resistance and voltage according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G35-1 (GND) - Body ground
    		Always
    		Below 1 Ω
    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G35-3 (IGE) - G35-1 (GND)
    		Steering lock motor operating immediately after turning engine switch from off to on (IG)
    		Below 1 V
    G35-3 (IGE) - G35-1 (GND)
    		Steering lock motor not operating
    		11 to 14 V
    Text in Illustration
    *a
    		Component with harness connected
    (Steering Lock ECU)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT CONTROL ECU)

  1. Disconnect the G51 power management control ECU connector.

  1. Disconnect the G35 steering lock ECU connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G35-3 (IGE) - G51-8 (SLR+)
    		Always
    		Below 1 Ω
    G35-3 (IGE) or G51-8 (SLR+) - Body ground
    		Always
    		10 kΩ or higher

    Result
    Result
    		Proceed to
    NG
    		A
    OK
    		for Manual Tilt and Manual Telescopic Steering Column
    		B
    for Power Tilt and Power Telescopic Steering Column
    		C


B
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) (LandCruiser RM0000039SJ01JX.html)

C
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) (LandCruiser RM0000039SJ01KX.html)
A

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.READ VALUE USING INTELLIGENT TESTER (FL AND FR DOOR COURTESY)

  1. Use the Data List to check if the driver side door courtesy switch is functioning properly.

    Main Body
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    FL Door Courtesy
    		Front door courtesy switch LH/ON or OFF
    		ON: Front door courtesy switch LH on
    OFF: Front door courtesy switch LH off
    		-
    FR Door Courtesy
    		Front door courtesy switch RH/ON or OFF
    		ON: Front door courtesy switch RH on
    OFF: Front door courtesy switch RH off
    		-
    OK:
    Driver side door courtesy switch is functioning properly.


NG
GO TO LIGHTING SYSTEM (DOOR COURTESY SWITCH CIRCUIT) (LandCruiser RM0000011T30D0X.html)
OK


5.READ VALUE USING INTELLIGENT TESTER (S CODE CHECK)

  1. Use the Data List to check if the S code certification is functioning properly.

    Entry&Start
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    S Code Check
    		S code certification result/NG or OK
    		OK: S code certification result normal
    NG: S code certification result abnormal
    		-
    OK:
    OK is displayed on the intelligent tester.


NG
Go to step 9
OK


6.READ VALUE USING INTELLIGENT TESTER (L CODE CHECK)

  1. Use the Data List to check if the L code certification is functioning properly.

    Entry&Start
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    L Code Check
    		L code certification result/NG or OK
    		OK: L code certification result normal
    NG: L code certification result abnormal
    		-
    OK:
    OK is displayed on the intelligent tester.


NG
Go to step 11
OK


7.REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

  1. Replace the steering lock actuator assembly (steering lock ECU) (LandCruiser RM0000039SJ01JX.html for Manual Tilt and Manual Telescopic Steering Column, LandCruiser RM0000039SJ01KX.html for Power Tilt and Power Telescopic Steering Column).


NEXT


8.CHECK STEERING LOCK RELEASE OPERATION

  1. Turn the engine switch on (IG).

  1. Operate the steering wheel and check the steering lock condition.

    OK:
    Steering lock is released.


NG
REPLACE CERTIFICATION ECU
OK

END (STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) IS DEFECTIVE)

9.REPLACE ID CODE BOX

  1. Replace the ID code box.


NEXT


10.READ VALUE USING INTELLIGENT TESTER (S CODE CHECK)

  1. Use the Data List to check if the S code certification is functioning properly.

    Entry&Start
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    S Code Check
    		S code certification result/NG or OK
    		OK: S code certification result normal
    NG: S code certification result abnormal
    		-
    OK:
    OK is displayed on the intelligent tester.


NG
REPLACE CERTIFICATION ECU
OK

END (ID CODE BOX IS DEFECTIVE)

11.REPLACE ID CODE BOX

  1. Replace the ID code box.


NEXT


12.READ VALUE USING INTELLIGENT TESTER (L CODE CHECK)

  1. Use the Data List to check if the L code certification is functioning properly.

    Entry&Start
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    L Code Check
    		L code certification result/NG or OK
    		OK: L code certification result normal
    NG: L code certification result abnormal
    		-

    Result
    Result
    		Proceed to
    OK is displayed on the intelligent tester.
    		A
    NG is displayed on the intelligent tester.
    		for Manual Tilt and Manual Telescopic Steering Column
    		B
    for Power Tilt and Power Telescopic Steering Column
    		C


B
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) (LandCruiser RM0000039SJ01JX.html)

C
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) (LandCruiser RM0000039SJ01KX.html)
A

END (ID CODE BOX IS DEFECTIVE)