STEERING LOCK SYSTEM TERMINALS OF ECU


  1. TERMINAL INSPECTION


    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
      K28-1 (GND) - Body ground - W-B - Body ground Ground* Always Below 1 Ω -
      K28-3 (IGE) - K28-1 (GND) Input W - 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 power switch on (IG)

      • After above conditions met, power switch turned off

      		 Pulse generation (see waveform)

        Entry&Start

      • Power Supply Short

      • Unlock Request Receive

      • Lock Request Receive
      K28-4 (SLP1) - K28-1 (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
      K28-5 (LIN) - K28-1 (GND) Input/Output V - W-B LIN communication line - -

        Entry&Start

      • Steering Lock Start Cond
      K28-6 (IG2) - K28-1 (GND) Input B - W-B Power source mode signal (IG2 power supply input for entire steering lock actuator assembly)* Power switch off → power switch on (IG) Below 1 V → 11 to 14 V -
      K28-7 (B) - Body ground Input G - 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.

      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 key and turn the power switch on (ACC) or on (IG).

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


      1. A011PT7C19
        *a Steering Lock Motor not Operating
        *b Steering Lock Motor Operating

        Waveform

        Item Content
        Tester Connection K28-3 (IGE) - K28-1 (GND)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Vehicle Condition Steering lock motor not operating → Operating → Not operating