STEERING LOCK SYSTEM TERMINALS OF ECU

  1. CHECK STEERING LOCK ECU

    U122579E02

    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.