ENTRY AND START SYSTEM (for Start Function) TERMINALS OF ECU


  1. CHECK POWER MANAGEMENT CONTROL ECU

    A01IOLCE05

    1. Disconnect the H71 power management control 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
      H71-1 (AM22) - Body ground L - Body ground +B power supply Always 9.5 to 16 V
      H71-2 (AM21) - Body ground B - Body ground +B power supply Always 9.5 to 16 V
      H71-5 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      H71-6 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      H71-17 (SSW2) - Body ground L - Body ground Engine switch signal Engine switch pushed Below 1 Ω
      H71-17 (SSW2) - Body ground L - Body ground Engine switch signal Engine switch not pushed 10 kΩ or higher
      H71-18 (SSW1) - Body ground R - Body ground Engine switch signal Engine switch pushed Below 1 Ω
      H71-18 (SSW1) - Body ground R - Body ground Engine switch signal Engine switch not pushed 10 kΩ or higher
      H71-24 (LIN2) - Body ground V - Body ground LIN line Always 10 kΩ or higher

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

    3. Reconnect the H71 power management control 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
      H71-3 (SLP) - H71-6 (GND) G - W-B Steering lock actuator position signal Steering lock released

      Pulse generation

      (See waveform 1)
      H71-3 (SLP) - H71-6 (GND) G - W-B Steering lock actuator position signal Steering lock locked

      Pulse generation

      (See waveform 1)
      H71-8 (SLR+) - H71-6 (GND) P - W-B Steering lock motor signal Steering lock motor operating Below 1 V
      H71-8 (SLR+) - H71-6 (GND) P - W-B Steering lock motor signal Steering lock motor not operating 11 to 14 V
      H71-10 (INDW) - H71-6 (GND) W - W-B Warning signal

        for Manual Transaxle:

      • Clutch pedal depressed

      • Engine switch on (ACC) or on (IG)


        except Manual Transaxle:

      • Brake pedal depressed

      • Shift lever in P

      • Engine switch on (ACC) or on (IG)

      		 8 to 14 V
      H71-16 (P) - H71-6 (GND) BE - W-B Shift lock signal Shift lever in P*1 8 to 14 V
      H71-16 (P) - H71-6 (GND) BE - W-B Shift lock signal Shift lever not in P*1 Below 1 V
      H71-19 (ACCD) - H71-6 (GND) GR - W-B ACC signal Engine switch on (ACC) 8 to 14 V
      H71-19 (ACCD) - H71-6 (GND) GR - W-B ACC signal Engine switch off Below 1 V
      H71-20 (IG1D) - H71-6 (GND) W - W-B IG1 signal Engine switch on (IG) 8 to 14 V
      H71-20 (IG1D) - H71-6 (GND) W - W-B IG1 signal Engine switch on (ACC) Below 1 V
      H71-22 (INDS) - H71-6 (GND) G - W-B Vehicle condition signal

        for Manual Transaxle:

      • Clutch pedal depressed


        except Manual Transaxle:

      • Brake pedal depressed

      • Shift lever in P

      		 8 to 14 V
      H71-23 (SPD) - H71-6 (GND) Y - W-B Vehicle speed signal Engine switch on (IG), vehicle being driven at approx. 20 km/h (12 mph)

      Pulse generation

      (See waveform 2)
      H70-2 (STA) - H71-6 (GND) LG - W-B Park/neutral position switch*1 or clutch start switch*2 signal

        for Manual Transaxle:

      • Clutch pedal depressed


        except Manual Transaxle:

      • Shift lever in P or N

      		 Below 1 V
      H70-3 (STAR) - H71-6 (GND) R - W-B Starter signal

        for Manual Transaxle:

      • Clutch pedal depressed

      • Engine cranking


        except Manual Transaxle:

      • Brake pedal depressed

      • Shift lever in P

      • Engine cranking

      		 8 to 14 V*3
      H70-8 (IG2D) - H71-6 (GND) GR - W-B IG2 signal Engine switch on (IG) 8 to 14 V
      H70-8 (IG2D) - H71-6 (GND) GR - W-B IG2 signal Engine switch on (ACC) Below 1 V
      H70-11 (STP1) - H71-6 (GND) Y - W-B Stop light signal Brake pedal depressed*1 8 to 14 V
      H70-11 (STP1) - H71-6 (GND) Y - W-B Stop light signal Brake pedal released*1 Below 1 V

      • *1: except Manual Transaxle

      • *2: for Manual Transaxle

      • *3: Voltage is output for 0.3 seconds when the engine is cranking. Disconnect the A51 connector from the ECM before measuring the voltage.

      If the result is not as specified, the ECU may have a malfunction.

    5. Using an oscilloscope, check the signal waveform of the ECU.


      1. A01ITS7E03

        Waveform 1

        Waveform 1 (Reference)
        Terminal No. (Symbol) H71-3 (SLP) - H71-6 (GND)
        Tool Setting 2 V/DIV., 100 ms./DIV.
        Vehicle Condition Steering lock locked or released
      2. A01IO9ME01

        Waveform 2

        Waveform 2 (Reference)
        Terminal No. (Symbol) H71-23 (SPD) - H71-6 (GND)
        Tool Setting 5 V/DIV., 10 ms./DIV.
        Vehicle Condition Engine switch on (IG), vehicle being driven at approx. 5 km/h (3 mph)

        Tech Tips

        As the vehicle speed increases, the wavelength shortens.

  2. CHECK CERTIFICATION ECU

    A01IOA4E11

    1. Disconnect the H51 certification 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
      H51-1 (+B) - Body ground W - Body ground +B power supply Always 11 to 14 V
      H51-15 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
      H51-29 (LIN) - Body ground V - Body ground LIN line Always 10 kΩ or higher

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

  3. 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) - Body ground B - Body ground Ignition power supply Engine switch on (IG) 11 to 14 V
      H54-6 (IG2) - Body ground B - Body ground Ignition power supply Engine switch off Below 1 V
      H54-7 (B) - Body ground L - Body ground +B power supply 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
      H54-4 (SLP1) - H54-1 (GND) G - W-B Steering lock actuator position signal Steering lock locked 11 to 14 V
      H54-4 (SLP1) - H54-1 (GND) G - W-B Steering lock actuator position signal Steering lock released Below 1 V

      • If the result is not as specified, the ECU may have a malfunction.