STEERING LOCK SYSTEM Steering Lock Motor Drive Power Circuit

DESCRIPTION

The main body ECU supplies the power to activate the motor of the steering lock actuator assembly.

The diagnosis information of the steering lock ECU is transmitted to the tester via the certification ECU as the steering lock ECU is not connected to the CAN communication system.

WIRING DIAGRAM

A000ZTVE14
*a Steering Lock Motor
*b Main Body ECU (Driver Side Junction Block Assembly)
*c Steering Lock Actuator Assembly (Steering Lock ECU)

CAUTION / NOTICE / HINT

Tech Tips

When the power 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 power switch OFF, open the driver door. Then (with the power 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 power switch OFF and the shift lever on P, open and close the driver side door to record the current lock position into the steering lock ECU. If this is not performed, the hybrid control system may not start.

PROCEDURE


  1. CHECK VEHICLE CONDITION


    1. Check the problem symptom of the steering lock system.

      Result
      Condition Proceed to
      Steering lock cannot be released A
      Steering lock cannot be locked B

    B

    INSPECT STEERING LOCK ECU Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (LOCK / UNLOCK 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 / 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 tester screen.

    NG

    GO TO ENTRY AND START SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    OK

  3. INSPECT STEERING LOCK ECU

    A000YVXE02
    *1 Component with harness connected: (Steering Lock ECU)

    1. Immediately after turning the power switch ON (IG), measure the voltage between terminals L33-3 (IGE) and L33-1 (GND) of the steering lock ECU.

      Result
      Result Proceed to
      11 to 14 V (measured voltage never becomes below 1 V) A
      Below 1 V B

    B

    GO TO ENTRY AND START SYSTEM (PROBLEM SYMPTOMS TABLE) Click here

    A

  4. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - MAIN BODY ECU)

    A000ZD2E02
    *1 Front view of wire harness connector: (to Main Body ECU)
    *2 Front view of wire harness connector: (to Steering Lock ECU)

    1. Disconnect the L33 steering lock ECU connector.

    2. Disconnect the L13 main body ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L33-3 (IGE) - L13-19 (SLR+) Always Below 1 Ω
      L33-3 (IGE) or L13-19 (SLR+) - Body ground Always 10 kΩ or higher

    OK

    REPLACE MAIN BODY ECU

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. INSPECT STEERING LOCK ECU

    A000YVXE02
    *1 Component with harness connected: (Steering Lock ECU)

    1. Shift the shift lever to the P position.

    2. Turn the power switch OFF.

    3. Open the driver side door.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      L33-3 (IGE) - L33-1 (GND) Steering lock motor is operating Below 1 V
      L33-3 (IGE) - L33-1 (GND) Steering lock motor is not operating 11 to 14 V

    OK

    GO TO ENTRY AND START SYSTEM (PROBLEM SYMPTOMS TABLE) Click here

    NG

  6. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - MAIN BODY ECU)

    A000ZD2E02
    *1 Front view of wire harness connector: (to Main Body ECU)
    *2 Front view of wire harness connector: (to Steering Lock ECU)

    1. Disconnect the L33 steering lock ECU connector.

    2. Disconnect the L13 main body ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L33-3 (IGE) - L13-19 (SLR+) Always Below 1 Ω
      L33-3 (IGE) or L13-19 (SLR+) - Body ground Always 10 kΩ or higher

    OK

    REPLACE MAIN BODY ECU

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR