Steering Lock System Unable To Unlock Steering Wheel (Engine Cannot Start)


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ENGINE SWITCH (SWITCH CONDITION)

READ VALUE USING INTELLIGENT TESTER (UNLOCK REQUEST RECEIVE)

CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BATTERY AND BODY GROUND)

INSPECT STEERING LOCK ECU (IGE VOLTAGE)

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 Unlock Steering Wheel (Engine cannot Start)


DESCRIPTION

The power management control ECU supplies the power to activate the motor of the steering lock actuator assembly.
The steering lock actuator activates the steering lock motor and moves the lock bar into the steering column to lock the steering wheel.
The steering lock may not release when the lock bar gets stuck in the lock hole of the steering column. In this case, if an engine start operation is performed while shaking the steering wheel in the same manner as is done for a vehicle with a mechanical key, the lock bar will release.
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 Unlock Steering Wheel (Engine Cannot Start)


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.CHECK ENGINE SWITCH (SWITCH CONDITION)

  1. Check the power source mode change.

    1. When the key is inside the vehicle and the shift lever is in P*, check that pressing the engine switch causes the power source mode to change as follows:

      1. *: for Automatic Transmission
      OK:
      off → on (ACC) → on (IG) → off


NG
GO TO ENTRY AND START SYSTEM (FOR START FUNCTION) (PROBLEM SYMPTOMS TABLE) (LandCruiser RM000000XI60N9X.html)
OK


2.READ VALUE USING INTELLIGENT TESTER (UNLOCK 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
    Unlock Request Receive
    		Steering lock unlock command reception status/NG or OK
    		NG: Unlock request not received
    OK: Unlock request received
    		-
    OK:
    The certification ECU receives an unlock request signal within 10 seconds of starting the engine, and OK is displayed on the intelligent tester screen.


NG
Go to step 5
OK


3.CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BATTERY AND BODY GROUND)


    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 Unlock Steering Wheel (Engine Cannot Start)

  1. Disconnect the G35 steering lock ECU connector.

  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
    G35-7 (B) - Body ground
    		Always
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Steering Lock ECU)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT STEERING LOCK ECU (IGE VOLTAGE)


    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 Unlock Steering Wheel (Engine Cannot Start)

  1. Move the shift lever to P.*

    1. *: for Automatic Transmission

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

    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)

    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

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 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)