STEERING LOCK SYSTEM Unable to Lock Steering Wheel

DESCRIPTION

The steering lock ECU sends an unlock position signal to the power management control ECU. On 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

A004R0SE44
*a Power Management Control ECU
*b Steering Lock Actuator Assembly (Steering Lock ECU)

CAUTION / NOTICE / HINT

Tech Tips

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.

Note


  • If the steering lock actuator assembly (steering lock ECU) is replaced, with the engine switch off, 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.

  • 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.

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
    OK
  2. INSPECT STEERING LOCK ECU (IGE VOLTAGE)


    1. A004RE4E02
      Text in Illustration
      *1

      Component with harness connected

      (Steering Lock ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D57-3 (IGE) - D57-1 (GND) Steering lock motor operating immediately after turning engine switch from off to on (IG) Below 1 V
      D57-3 (IGE) - D57-1 (GND) Steering lock motor not operating 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      D57-1 (GND) - Body ground Always Below 1 Ω

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


    1. Disconnect the D111 power management control ECU connector.

      A004TQHE02
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      *2

      Front view of wire harness connector

      (to Steering Lock ECU)

    2. Disconnect the D57 steering lock ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D57-3 (IGE) - D111-8 (SLR+) Always Below 1 Ω
      D57-3 (IGE) or D111-8 (SLR+) - Body ground Always 10 kΩ or higher

    OK
    NG
  4. READ VALUE USING INTELLIGENT TESTER (DRIVER SIDE DOOR COURTESY SWITCH)


    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
      D Door Courtesy SW Driver side door courtesy switch condition/ON or OFF

      ON: Driver side door courtesy switch on

      OFF: Driver side door courtesy switch off

      -
      OK
      Driver side door courtesy switch is functioning properly.

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


    1. Replace the steering lock actuator assembly (steering lock ECU) Click here.


    NEXT
  8. CHECK STEERING LOCK RELEASE OPERATION


    1. Turn the engine switch on (IG).

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

      OK
      Steering lock is released.

    OK
    NG
  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.

    OK
    NG
  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

      -

    OK
    NG