Text in Illustration

    Component without harness connected

    (Steering Lock ECU (Steering Lock Actuator Assembly))

    - -

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

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item
      H18-1 (GND) - Body ground - W-B - Body ground Ground* Always Below 1 Ω -
      H18-3 (IGE) - H18-1 (GND) Input L - W-B Steering lock motor activation command signal (motor activation command signal sent from certification ECU (smart key ECU assembly))

      Any door opened when conditions below met, and then steering lock motor activated:

      • Shift lever in P

      • Steering lock unlocked in advance by carrying key and turning engine switch on (IG)

      • After above conditions met, engine switch turned off

      Pulse generation (see waveform)


      • Power Supply Short

      • Unlock Request Receive

      • Lock Request Receive

      H18-4 (SLP1) - H18-1 (GND) Output P - W-B Steering lock bar position signal (output signal from steering unlock sensor) Steering locked → unlocked 11 to 14 V → Below 1.2 V


      • Push Start Error

      • Sensor Value

      H18-5 (LIN) - H18-1 (GND) Input/Output B - W-B LIN communication line - -


      • Steering Lock Start Cond

      H18-6 (IG2) - H18-1 (GND) Input LG - W-B Power source mode signal (IG2 power supply input for entire steering lock actuator assembly)* Engine switch off → engine switch on (IG) Below 1 V → 11 to 14 V


      • Ignition Switch

      H18-7 (B) - Body ground Input B - Body ground Power source* Always 11 to 14 V -

      • *: When there is a problem with the power source input, the certification ECU (smart key ECU assembly) may store DTC B2786.


      There is 1 motor and 2 sensors built into the steering lock actuator assembly.

      Tech Tips

      • When taking measurements when the lock motor is stopped, it is not necessary to perform any operations.

      • In order to take measurements when the lock motor is operating, perform either of the following operations:

        • To unlock the steering, carry the key and turn the engine switch on (ACC) or on (IG) with the shift lever in P.

        • To lock the steering, turn the engine switch off with the shift lever in P, and then open a door.

      1. A01G9PKE01
        Text in Illustration
        *a Steering lock motor not operating
        *b Steering lock motor operating


        Item Content
        Tester Connection H18-3 (IGE) - H18-1 (GND)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Vehicle Condition Steering lock motor not operating → Steering lock motor operating → Steering lock motor not operating