STEERING LOCK SYSTEM TERMINALS OF ECU


  1. TERMINAL INSPECTION


    1. Measure the voltage, resistance and check for pulses 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
      G19-1 (GND) - Body ground - W-B - Body ground Ground*2 Always Below 1 Ω -
      G19-3 (IGE) - G19-1 (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*1

      • 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
      G19-4 (SLP1) - G19-1 (GND) Output R - 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
      G19-5 (LIN) - G19-1 (GND) Input/Output V - W-B LIN communication line - -

        Entry&Start

      • Steering Lock Start Cond
      G19-6 (IG2) - G19-1 (GND) Input P - W-B Power source mode signal (IG2 power supply input for entire steering lock actuator assembly)*2 Engine switch off → engine switch on (IG) Below 1 V → 11 to 14 V -
      G19-7 (B) - Body ground Input W - Body ground Power source*2 Always 11 to 14 V -

      • *1: for Automatic Transmission

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

      Note

      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 electrical key transmitter sub-assembly 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.


      • *: for Automatic Transmission


      1. B003QSFC35
        *a Steering lock motor not operating
        *b Steering lock motor operating

        Waveform

        Item Content
        Tester Connection G19-3 (IGE) - G19-1 (GND)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Vehicle Condition Steering lock motor not operating → Operating → Not operating