STEERING LOCK SYSTEM TERMINALS OF ECU


  1. CHECK STEERING LOCK ECU

    A01IRL7E11

    1. Disconnect the H54 steering lock ECU connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      H54-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      H54-6 (IG2) - H54-1 (GND) B - W-B IG2 signal input Engine switch off → engine switch on (IG) Below 1 V → 11 to 14 V
      H54-7 (B) - H54-1 (GND) L - W-B Power source Always 11 to 14 V

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the H54 steering lock ECU connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      H54-3 (IGE) - H54-1 (GND) P - W-B Power source for motor drive

      When all conditions are met:


      • Steering lock unlocked

      • Engine switch off

      • Shift lever in P*

      • Driver side door closed → opened

      		 11 to 14 V (Steering lock motor not operating) → Below 1 V (Steering lock motor operating) → 11 to 14 V (Steering lock motor not operating)
      H54-4 (SLP1) - H54-1 (GND) G - W-B Unlock position sensor output signal Steering lock locked → steering lock unlocked 11 to 14 V → Below 1.2 V

      *: except Manual Transaxle

      If the result is not as specified, there may be a malfunction in the steering lock ECU.