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


  1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    B007OQEE01

    1. Disconnect the B75 and B76 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
      B76-37 (STA) - Body ground Input R - Body ground When starting the engine, this monitors the voltage sent from terminal STAR to the starter relay to judge whether the engine is "being started". 20°C (68°F) 93.75 to 136.36 Ω -
      B76-16 (STAR) - Body ground Input/Output B - Body ground

      Outputs voltage to the starter relay


      • Outputs voltage (12 V) to the starter relay when starting the engine. (Max. 30 sec. Turns off when an engine speed of 500 rpm or more continues for 500 ms or more.)

      Tech Tips

      When Hi is selected, a start request signal (STAR) will not be output even though a start request signal (STSW) is input.

      		 Shift lever in any position other than P or N → shift lever in P or N (at 20°C (68°F)) 10 kΩ or higher → 93.75 to 136.36 Ω -

      Receives neutral start switch (P, N position detection) signal


      • Monitors whether the neutral start switch is on (P or N) or off (other than P or N). Applies voltage via a resistor (large) in the certification ECU (smart key ECU assembly). When the neutral start switch is on, due to the starter relay coil resistance (small) using some of the voltage, the voltage at terminal STAR will be low (2.7 V or less), and when the neutral start switch is off, the voltage will be high (9 V or more).

      Perform the following operations except while the engine is cranking:


      • Shift lever in any position other than P or N → shift lever in P or N(at 20°C (68°F))

      		 30 kΩ or higher → 93.75 to 136.36 Ω Neutral SW/ Clutch SW
      B75-6 (NE) - Body ground Input V - Body ground Engine speed signal Always 10 kΩ or higher Engine Condition
      B75-11 (STP1) - Body ground Input R - Body ground Stop light switch signal Brake pedal released → Brake pedal depressed 1 V or less → 9 V or higher Stop Light Switch1
      B75-1 (+B) - B75-10 (E) Input L - W-B Power source Always 11 to 14 V -
      B75-22 (SLP) - B75-10 (E) Input LG - W-B Steering lock position signal Always 10 kΩ or higher Steering Unlock Switch
      B75-8 (P) - B75-10 (E) Input BE - W-B P position signal Shift lever in P → Shift lever not in P 40 kΩ or higher → 200 Ω or less Shift P Signal
      B75-10 (E) - Body ground - W-B - Body ground GND Always Below 1 Ω -
      B75-16 (SSW2) - Body ground Input GR - Body ground

      SSW2 contact signal

      Tech Tips

      Backup for SSW1. Behaves the same way as SSW1.

      		 Engine switch pushed → Engine switch not pushed Below 1 Ω → 10 kΩ or higher Start Switch2
      B75-18 (SSW1) - Body ground Input Y - Body ground SSW1 contact signal Engine switch pushed → Engine switch not pushed Below 1 Ω → 10 kΩ or higher Start Switch1
      B75-21 (ACCD) - Body ground Output R - Body ground ACC signal 20°C (68°F) 286.11 to 461.12 Ω ACC Relay Monitor
      B75-20 (IG1D) - Body ground Output B - Body ground IG1 signal 20°C (68°F) 286.12 to 461.13 Ω IG Relay Monitor (Outside)
      B76-33 (CUTB) - B75-10 (E) Input W - W-B Dark current cut pin* Always 11 to 14 V -
      B75-7 (SPD) - Body ground Input P - Body ground Vehicle speed signal Always 30 kΩ or higher Vehicle Speed Signal

      • *: In order to prevent the vehicle battery from being depleted when the vehicle is shipped long distances, a fuse that cuts unnecessary electrical load while the vehicle is being shipped is set in the circuit. If the fuse is removed, the circuit becomes open. If the fuse that is between the vehicle battery and terminal CUTB is removed and the circuit is open, the certification ECU (smart key ECU assembly) changes to a certain control mode (example: the transmission of electric waves every 0.25 seconds that form the detection area stops).

    3. Reconnect the B75 and B76 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
      B76-37 (STA) - B75-10 (E) Input R - W-B When starting the engine, this monitors the voltage sent from terminal STAR to the starter relay to judge whether the engine is "being started". With the brake pedal depressed, the engine switch is pressed and held (starter on) → After approx. 1 sec. has elapsed, the engine switch is released (starter off) 6 V or higher* → 1.5 V or less -
      B76-16 (STAR) - B75-10 (E) Input/Output B - W-B

      Outputs voltage to the starter relay


      • Outputs voltage (12 V) to the starter relay when starting the engine. (Max. 30 sec. Turns off when an engine speed of 500 rpm or more continues for 500 ms or more.)

      Tech Tips

      When Hi is selected, a start request signal (STAR) will not be output even though a start request signal (STSW) is input.

      		 With the brake pedal depressed, the engine switch is pressed and held → After approx. 1 sec. has elapsed, the engine switch is released 6 V or higher* → 1.5 V or less -

      Receives neutral start switch (P, N position detection) signal


      • Monitors whether the neutral start switch is on (P or N) or off (other than P or N). Applies voltage via a resistor (large) in the certification ECU (smart key ECU assembly). When the neutral start switch is on, due to the starter relay coil resistance (small) using some of the voltage, the voltage at terminal STAR will be low (2.7 V or less), and when the neutral start switch is off, the voltage will be high (9 V or more).

      Perform the following operations except while the engine is cranking:


      • Shift lever in any position other than P or N → shift lever in P or N

      		 9 V or higher → 2.7 V or less Neutral SW/ Clutch SW
      B75-6 (NE) - B75-10 (E) Input V - W-B Engine speed signal Idling (engine warmed up)

      Pulse generation

      (See waveform 1)

      		 Engine Condition
      B75-11 (STP1) - B75-10 (E) Input R - W-B Stop light switch signal Brake pedal released → Brake pedal depressed 1 V or less → 9 V or higher Stop Light Switch1
      B75-22 (SLP) - B75-10 (E) Input LG - W-B Steering lock position signal Steering wheel locked → Steering wheel unlocked 11 to 14 V → 1.5 V or less Steering Unlock Switch
      B75-17 (SLR+) - B75-10 (E) Output V - W-B

      Steering lock motor operation command signal

      (Steering lock motor operation permission signal sent from the certification ECU (smart key ECU assembly))

      When a door is opened, the steering lock motor will be operated if all of the following conditions are met:


      • The steering is unlocked.

      • The engine switch is off.

      • The shift lever is in P.

      Pulse generation

      (See waveform 2)

      		 -
      B75-8 (P) - B75-10 (E) Input BE - W-B P position signal Shift lever in P → Shift lever not in P 9 V or higher → 2.76 V or less Shift P Signal
      B75-16 (SSW2) - B75-10 (E) Input GR - W-B

      SSW2 contact signal

      Tech Tips

      Backup for SSW1. Behaves the same way as SSW1.

      		 Engine switch not pushed → Engine switch pushed 9 V or higher → 1 V or less Start Switch2
      B75-18 (SSW1) - B75-10 (E) Input Y - W-B SSW1 contact signal Engine switch not pushed → Engine switch pushed 9 V or higher → 1 V or less Start Switch1
      B75-21 (ACCD) - B75-10 (E) Output R - W-B ACC signal Engine switch off → Engine switch on (ACC) 1 V or less → 8.5 V or higher ACC Relay Monitor
      B75-20 (IG1D) - B75-10 (E) Output B - W-B IG1 signal Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher IG Relay Monitor (Outside)
      B75-7 (SPD) - B75-10 (E) Input P - W-B Vehicle speed signal Vehicle being driven at approx. 5 km/h (3 mph)

      Pulse generation

      (See waveform 3)

      		 Vehicle Speed Signal

      Tech Tips


      • *: While the engine is cranking, the battery voltage may drop to approximately 6 V.

      • The waveform of the steering lock actuator motor stopped can be checked without performing any particular operation.

      • The waveform of the steering lock actuator motor operating can be checked if either of the following operations is performed:


        • To unlock the steering, bring the electrical key transmitter sub-assembly into the cabin and turn the engine switch on (ACC) or on (IG).

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

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

      Tech Tips

      The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.


      1. B007SY9E01

        Waveform 1

        Item Content
        Tester Connection B75-6 (NE) - B75-10 (E)
        Tool Setting 2 V/DIV., 2 ms./DIV.
        Vehicle Condition Idling (engine warmed up)

        Tech Tips

        The wavelength becomes shorter as the engine speed increases.

      2. B007QVHE01
        Text in Illustration
        *a Steering Lock Motor not Operating
        *b Steering Lock Motor Operating

        Waveform 2

        Item Content
        Tester Connection B75-17 (SLR+) - B75-10 (E)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Vehicle Condition Steering lock motor not operating → Operating → Not operating
      3. B007QA1E01

        Waveform 3

        Item Content
        Tester Connection B75-7 (SPD) - B75-10 (E)
        Tool Setting 5 V/DIV., 20 ms./DIV.
        Vehicle Condition Engine switch on (IG), vehicle being driven at approx. 5 km/h (3 mph)

        Tech Tips

        The wavelength becomes shorter as the vehicle speed increases.

  2. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) Click here

  3. CHECK ID CODE BOX (IMMOBILISER CODE ECU) Click here