STEERING LOCK SYSTEM Unable to Unlock Steering Wheel

DESCRIPTION

The main body 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

A001ANFE09
*a from Battery
*b Steering Lock Motor
*c Main Body ECU
*d 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.

PROCEDURE


  1. CHECK ENGINE SWITCH


    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:

        OK
        off → on(ACC) → on(IG) → off
        Result
        Result Proceed to
        OK A
        NG (for 1UR-FE) B
        NG (for 1UR-FSE) C

    B
    C
    A
  2. CHECK FOR DTC (MAIN BODY ECU)


    1. Check the DTCs of the main body ECU by following the prompts displayed on the intelligent tester screen (See page for 1UR-FE: , for 1UR-FSE: Click here).

      OK
      No DTCs related to main body ECU are output.
      Result
      Result Proceed to
      OK A
      NG (for 1UR-FE) B
      NG (for 1UR-FSE) C

    B
    C
    A
  3. CHECK FOR DTC (CERTIFICATION ECU)


    1. Check the DTCs of the certification ECU by following the prompts displayed on the intelligent tester screen Click here.

      OK
      No DTCs related to certification ECU are output.

    NG
    OK
  4. READ VALUE USING INTELLIGENT TESTER (LOCK/UNLOCK RECEIVE)


    1. Within 10 seconds of the engine switch being turned on (IG), check the Data List and read the value displayed on the intelligent tester screen.

      Entry & Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Lock / Unlock Receive Steering lock command reception record/ YES or NO

      YES: Steering lock / unlock signal received

      NO: Steering lock / unlock signal not received

      -
      OK
      YES is displayed on the intelligent tester screen.

    NG
    OK
  5. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BODY GROUND)


    1. Disconnect the L33 steering lock ECU connector.

    2. A001C4NE03
      *1 Front view of wire harness connector: (to Steering Lock Actuator)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L33-7 (B) - L33-1 (GND) Always 11 to 14 V
      L33-7 (B) - L33-2 (SGND) Always 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      L33-1 (GND) - Body ground Always Below 1 Ω
      L33-2 (SGND) - Body ground Always Below 1 Ω

    NG
    OK
  6. CHECK STEERING LOCK ECU


    1. Move the shift lever to P.

    2. A001BFYE10
      *1 Component with harness connected: (Steering Lock Actuator)

      Immediately after turning the engine switch on (IG), inspect the voltage between terminals 3 (IGE) and 2 (SGND) of the steering lock ECU.

      Result
      Result Proceed to
      Measurement is 11 to 14 V, and measurement never becomes 1 V or less A
      Immediately after turning engine switch on (IG), measurement is 1 V or less (w/o VGRS) B
      Immediately after turning engine switch on (IG), measurement is 1 V or less (for 2WD with VGRS) C
      Immediately after turning engine switch on (IG), measurement is 1 V or less (for AWD with VGRS) D

    A
    B
    C
    D
  7. 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 match record/ NG or OK

      NG: S code not matched

      OK: S code matched

      -
      OK
      OK is displayed on the intelligent tester.

    NG
    OK
  8. 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 match record/ NG or OK

      NG: L code not matched

      OK: L code matched

      -
      OK
      OK is displayed on the intelligent tester.

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


    1. Replace the steering lock actuator assembly (steering lock ECU) (See page w/o VGRS: , for 2WD with VGRS: , for AWD with VGRS: Click here).


    NEXT
  10. 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
  11. REPLACE ID CODE BOX


    1. Replace the ID code box.


    NEXT
  12. 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 match record/ NG or OK

      NG: S code not matched

      OK: S code matched

      -
      OK
      OK is displayed on the intelligent tester.

    OK
    NG
  13. REPLACE ID CODE BOX


    1. Replace the ID code box.


    NEXT
  14. 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 match record/ NG or OK

      NG: L code not matched

      OK: L code matched

      -
      OK
      OK is displayed on the intelligent tester.
      Result
      Result Proceed to
      OK A
      NG (w/o VGRS) B
      NG (for 2WD with VGRS) C
      NG (for AWD with VGRS) D

    A
    B
    C
    D