STEERING LOCK SYSTEM TERMINALS OF ECU


  1. TERMINAL INSPECTION


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

      for LHD
      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item
      L1-1 (GND) - Body ground - W-B - Body ground Ground*1 Always Below 1 Ω -
      L1-3 (IGE) - L1-1 (GND) Input SB - 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)

        Entry&Start

      • Power Supply Short

      • Unlock Request Receive

      • Lock Request Receive
      L1-4 (SLP1) - L1-1 (GND) Output GR - W-B Steering lock bar position signal (output signal from steering unlock sensor) Steering locked → unlocked 11 to 14 V → Below 1.5 V

        Entry&Start

      • Sensor Value
      L1-5 (LIN) - L1-1 (GND) Input/Output R - W-B LIN communication line - -

        Entry&Start

      • Steering Lock Start Cond
      L1-6 (IG2) - L1-1 (GND) Input P - W-B Power source mode signal (IG2 power supply input for entire steering lock actuator or upper bracket assembly)*1 Engine switch off → engine switch on (IG) Below 1 V → 11 to 14 V -
      L1-7 (B) - Body ground Input V - Body ground Power source*1 Always 11 to 14 V -
      for RHD
      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item
      J26-1 (GND) - Body ground - W-B - Body ground Ground*1 Always Below 1 Ω -
      J26-3 (IGE) - J26-1 (GND) Input SB - 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)

        Entry&Start

      • Power Supply Short

      • Unlock Request Receive

      • Lock Request Receive
      J26-4 (SLP1) - J26-1 (GND) Output SB - W-B Steering lock bar position signal (output signal from steering unlock sensor) Steering locked → unlocked 11 to 14 V → Below 1.5 V

        Entry&Start

      • Sensor Value
      J26-5 (LIN) - J26-1 (GND) Input/Output R - W-B LIN communication line - -

        Entry&Start

      • Steering Lock Start Cond
      J26-6 (IG2) - J26-1 (GND) Input

      V - W-B*2

      P - W-B*3

      		 Power source mode signal (IG2 power supply input for entire steering lock actuator or upper bracket assembly)*5 Engine switch off → engine switch on (IG) Below 1 V → 11 to 14 V -
      J26-7 (B) - Body ground Input V - Body ground Power source*5 Always 11 to 14 V -

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

      • *2: for 8AR-FTS

      • *3: for 2GR-FKS

      Note

      There is 1 motor and 2 sensors built into the steering lock actuator or upper bracket 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).

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


      1. A01RDTHC19
        *a Steering Lock Motor not Operating
        *b Steering Lock Motor Operating

        Waveform

        for LHD
        Item Content
        Tester Connection L1-3 (IGE) - L1-1 (GND)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Vehicle Condition Steering lock motor not operating → Operating → Not operating
        for RHD
        Item Content
        Tester Connection J26-3 (IGE) - J26-1 (GND)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Vehicle Condition Steering lock motor not operating → Operating → Not operating