SMART KEY SYSTEM (for Start Function) TERMINALS OF ECU


  1. CHECK POWER MANAGEMENT CONTROL ECU

    A01I28JE45

    1. Disconnect the A39, I3 and I4 connectors.

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

      Tech Tips

      Measure the values on the wire harness side with the connector disconnected.

      Tester Connection Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item
      A39-2 (IG2D) - Body ground Output R - Body ground IG2 signal 20°C (68°F) Approximately 302.97 Ω IG2 Relay Monitor(Outside)
      I4-10 (STP) - Body ground Input W - Body ground Stop light switch signal Brake pedal released → Brake pedal depressed 9 V or higher → 1 V or less Stop Light Switch1
      I3-1 (AM22) - Body ground Input SB - Body ground Power source Power switch off 11 to 14 V -
      I4-7 (AM21) - Body ground Input L - Body ground Power source Power switch off 11 to 14 V -
      I4-12 (SLP) - Body ground Input P - Body ground Steering lock position signal Always 10 kΩ or higher Steering Unlock Switch
      I3-5 (E01) - Body ground - W-B - Body ground Ground Always Below 1 Ω -
      I4-5 (E02) - Body ground - W-B - Body ground Ground Always Below 1 Ω -
      I3-6 (E1) - Body ground - BR - Body ground Ground Always Below 1 Ω -
      I4-4 (E12) - Body ground - BR - Body ground Ground Always Below 1 Ω -
      I4-17 (SSW2) - Body ground Input V - Body ground

      SSW2 contact signal

      Tech Tips

      Backup for SSW1. Behaves the same way as SSW1.

      		 Power switch pushed → Power switch not pushed Below 1 Ω → 10 kΩ or higher Start Switch2
      I3-7 (SSW1) - Body ground Input R - Body ground SSW1 contact signal Power switch pushed → Power switch not pushed Below 1 Ω → 10 kΩ or higher Start Switch1
      I4-2 (IG1D) - Body ground Output P - Body ground IG1 signal 20°C (68°F) 40.74 to 59.49 Ω IG1 Relay Monitor(Outside)
      I4-1 (ACCD) - Body ground Output W - Body ground ACC signal 20°C (68°F) 81.49 to 118.98 Ω ACC Relay Monitor
      I3-16 (SPDI) - I3-6 (E1) Input V - BR Vehicle speed signal Always 30 kΩ or higher Vehicle Speed Signal
      I4-14 (P2) - I3-6 (E1) Input R - BR P position signal Always 40 kΩ or higher → 200 Ω or less Shift P Signal

    3. Reconnect the A39, I3 and I4 connectors.

    4. Measure the voltage and check for pulses according to the value(s) in the table below.

      Tester Connection Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item
      A39-2 (IG2D) - I3-6 (E1) Output R - BR IG2 signal Power switch on (ACC) → Power switch on (IG) 1 V or less → 9 V or higher IG2 Relay Monitor(Outside)
      I4-12 (SLP) - I3-6 (E1) Input P - BR Steering lock position signal Steering wheel locked → Steering wheel unlocked*1 11 to 14 V → 1.2 V or less Steering Unlock Switch
      I4-6 (SLR+) - I3-6 (E1) Output SB - BR Steering lock motor operation command signal (Steering lock motor operation permission signal sent from the certification ECU (smart key ECU assembly)) Steering lock motor stopped → Steering lock motor operating → Steering lock motor stopped*2 Pulse generation (See waveform 1) -
      I4-14 (P2) - I3-6 (E1) Input R - BR P position signal Shift lever in P → Shift lever not in P 9 V or higher → 1.5 V or less Shift P Signal
      I4-17 (SSW2) - I3-6 (E1) Input V - BR

      SSW2 contact signal

      Tech Tips

      Backup for SSW1. Behaves the same way as SSW1.

      		 Power switch not pushed → Power switch pushed 9 V or higher → 1 V or less Start Switch2
      I3-7 (SSW1) - I3-6 (E1) Input R - BR SSW1 contact signal Power switch not pushed → Power switch pushed 9 V or higher → 1 V or less Start Switch1
      I4-1 (ACCD) - I3-6 (E1) Output W - BR ACC signal Power switch off → Power switch on (ACC) 1 V or less → 8.5 V or higher ACC Relay Monitor
      I4-2 (IG1D) - I3-6 (E1) Output P - BR IG1 signal Power switch on (ACC) → Power switch on (IG) 1 V or less → 9 V or higher IG1 Relay Monitor(Outside)
      I3-16 (SPDI) - I3-6 (E1) Input V - BR Vehicle speed signal Vehicle being driven at approx. 5 km/h (3 mph)

      Pulse generation

      (See waveform 2)

      		 Vehicle Speed Signal

      Tech Tips


      • *1: When the power switch is turned off with the shift lever in P and any of the doors are opened or closed, the steering wheel will be locked. When the power switch is turned on (ACC) or on (IG), the steering wheel will be unlocked.

      • *2: When all of the following conditions are met, open any of the doors to operate the steering lock motor.


        • The shift lever is in P.

        • The power switch is off.

        • While carrying the electrical key transmitter sub-assembly, the power switch is turned on (IG) and the steering is unlocked.

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


      1. A01I4MLE01
        Text in Illustration
        *a Steering lock motor not operating
        *b Steering lock motor operating

        Waveform 1

        Item Content
        Tester Connection I4-6 (SLR+) - I3-6 (E1)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Vehicle Condition

        Steering lock motor stopped →

        Steering lock motor operating →

        Steering lock motor stopped

        Tech Tips

        When all of the following conditions are met, open any of the doors to operate the steering lock motor.


        • The shift lever is in P.

        • While carrying the electrical key transmitter sub-assembly, the power switch is turned on (IG) and the steering is unlocked.

        • The power switch is off.

      2. A01I4WME01

        Waveform 2

        Item Content
        Tester Connection I3-16 (SPDI) - I3-6 (E1)
        Tool Setting 5 V/DIV., 20 ms./DIV.
        Vehicle Condition Power switch on (IG), vehicle being driven at approx. 5 km/h (3 mph)

        Tech Tips

        The wavelength becomes shorter as the vehicle speed increases.