PUSH-BUTTON START TERMINALS OF ECU


  1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    B0058T7E10

    1. Disconnect the I51 and I53 certification ECU (smart key ECU assembly) 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
      I51-12 (STA) - Body ground Input LG - 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) 106.78 to 115.98 Ω -
      I51-10 (STAR) - Body ground Input/Output W - 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 → 107.05 to 116.33 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 → 107.05 to 116.33 Ω Neutral SW/ Clutch SW
      I51-14 (NE) - Body ground Input W - Body ground Engine speed signal Always 10 kΩ or higher Engine Condition
      I51-2 (STP1) - Body ground Input

      B - Body ground*1

      G - Body ground*2

      		 Stop light switch signal Brake pedal depressed → Brake pedal released 9 V or higher → 1 V or less Stop Light Switch1
      I53-10 (+B) - I53-11 (E) Input W - W-B Power source Always 11 to 14 V -
      I53-23 (SLP) - I53-11 (E) Input GR - W-B Steering lock position signal Steering locked 10 kΩ or higher Steering Unlock Switch
      I53-22 (P) - I53-11 (E) Input B - W-B P position signal Shift lever in P → Shift lever not in P 30 kΩ or higher → Below 200 Ω Shift P Signal
      I53-11 (E) - Body ground - W-B - Body ground GND Always Below 1 Ω -
      I53-18 (SSW2) - Body ground Input G - Body ground

      SSW2 contact signal

      Tech Tips

      Backup for SSW1. Behaves the same way as SSW1.

      		 Engine switch pushed → Engine switch not pushed Below 15 Ω → 10 kΩ or higher Start Switch2
      I53-16 (SSW1) - Body ground Input LG - Body ground SSW1 contact signal Engine switch pushed → Engine switch not pushed Below 15 Ω → 10 kΩ or higher Start Switch1
      I53-9 (ACCD) - Body ground Output L - Body ground ACC signal 20°C (68°F) 130.92 to 190.74 Ω ACC Relay Monitor
      I51-3 (IG1D) - Body ground Output W - Body ground IG signal 20°C (68°F) 87.32 to 127.14 Ω IG Relay Monitor (Outside)
      I51-4 (CUTB) - I53-11 (E) Input P - W-B Dark current cut pin*3 Always 11 to 14 V -
      I53-5 (SPD) - Body ground Input

      G - Body ground*1

      SB - Body ground*2

      		 Vehicle speed signal Always 30 kΩ or higher Vehicle Speed Signal

      • *1: for LHD

      • *2: for RHD

      • *3: 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 I53 and I51 certification ECU (smart key ECU assembly) 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
      I51-12 (STA) - I53-11 (E) Input LG - 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*4 → 1.0 V or less -
      I51-10 (STAR) - I53-11 (E) Input/Output W - 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*4 → 1.0 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 (at 20°C (68°F))

      		 9 V or higher → 2.7 V or less Neutral SW/ Clutch SW
      I51-14 (NE) - I53-11 (E) Input W - W-B Engine speed signal Idling (engine warmed up)

      Pulse generation

      (See waveform 1)

      		 Engine Condition
      I51-2 (STP1) - I53-11 (E) Input

      B - W-B*1

      G - W-B*2

      		 Stop light switch signal Brake pedal released → Brake pedal depressed 1 V or less → 9 V or higher Stop Light Switch1
      I53-23 (SLP) - I53-11 (E) Input GR - W-B Steering lock position signal Steering locked → Steering unlocked 11 to 14 V → 1.5 V or less Steering Unlock Switch
      I53-24 (SLR+) - I53-11 (E) Output L - 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)

      		 -
      I53-22 (P) - I53-11 (E) Input B - 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
      I53-18 (SSW2) - I53-11 (E) Input G - 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
      I53-16 (SSW1) - I53-11 (E) Input LG - W-B SSW1 contact signal Engine switch not pushed → Engine switch pushed 9 V or higher → 1 V or less Start Switch1
      I53-9 (ACCD) - I53-11 (E) Output L - W-B ACC signal Engine switch off → Engine switch on (ACC) 1 V or less → 8.5 V or higher ACC Relay Monitor
      I51-3 (IG1D) - I53-11 (E) Output W - W-B IG signal Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher IG Relay Monitor (Outside)
      I53-5 (SPD) - I53-11 (E) Input

      G - W-B*1

      SB - W-B*2

      		 Vehicle speed signal Vehicle being driven at approx. 5 km/h (3 mph)

      Pulse generation

      (See waveform 3)

      		 Vehicle Speed Signal
      I53-21 (CLG5) - I53-11 (E) Output R - W-B Output to No. 1 indoor electrical key antenna assembly (front floor)

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. Within 30 seconds of closing any door using the door outside handle

      Pulse generation

      (See waveform 4)

      		 Overhead + Front Room (key diagnostic mode)
      I53-20 (CG5B) - I53-11 (E) Output G - W-B Output to No. 1 indoor electrical key antenna assembly (front floor) (terminal on opposite side of component from CLG5 output terminal)

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. Within 30 seconds of closing any door using the door outside handle

      Pulse generation

      (See waveform 4)

      		 Overhead + Front Room (key diagnostic mode)
      I52-15 (CLG6) - I53-11 (E) Output W - W-B Output to No. 2 indoor electrical key antenna assembly (rear floor)

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. Within 30 seconds of closing any door using the door outside handle

      Pulse generation

      (See waveform 4)

      		 Overhead + Rear Room (key diagnostic mode)
      I52-14 (CG6B) - I53-11 (E) Output B - W-B Output to No. 2 indoor electrical key antenna assembly (rear floor) (terminal on opposite side of component from CLG6 output terminal)

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. Within 30 seconds of closing any door using the door outside handle

      Pulse generation

      (See waveform 4)

      		 Overhead + Rear Room (key diagnostic mode)
      I52-4 (CLG7) - I53-11 (E) Output W - W-B Output to No. 3 indoor electrical key antenna assembly (inside luggage)

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. Within 30 seconds of closing any door using the door outside handle

      Pulse generation

      (See waveform 4)

      		 Overhead + Back Door (inside) (key diagnostic mode)
      I52-3 (CG7B) - I53-11 (E) Output LG - W-B Output to No. 3 indoor electrical key antenna assembly (inside luggage) (terminal on opposite side of component from CLG7 output terminal)

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. Within 30 seconds of closing any door using the door outside handle

      Pulse generation

      (See waveform 4)

      		 Overhead + Back Door (inside) (key diagnostic mode)
      I52-18 (RCO) - I53-11 (E) Output R - W-B

      Output to door control receiver

      (Power supply for door control receiver. Certification ECU (smart key ECU assembly) outputs 5 V when receiver starts operating.)

      Procedure:


      1. Electrical key transmitter sub-assembly brought outside but kept inside wireless function operational area

      2. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

      Pulse generation

      (See waveform 5)

      		 -
      I52-19 (CSEL) - I53-11 (E) Output B - W-B Communication channel switching circuit

      Procedure:


      1. Engine switch off

      2. All doors closed

      		 Below 1 V → pulse generation -
      I52-20 (RDAM) - I53-11 (E) Input L - W-B

      Door control receiver verifies data received from electrical key transmitter sub-assembly.

      Door control receiver sends data from electrical key transmitter sub-assembly to certification ECU (smart key ECU assembly) (Door control receiver intermittently grounds 12 V signal from certification ECU (smart key ECU assembly)).

      Proceed:


      1. Engine switch off

      2. All doors locked

      3. Electrical key transmitter sub-assembly not inside vehicle

      4. Electrical key transmitter sub-assembly brought outside but kept inside wireless function operational area

      5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

      Pulse generation

      (See waveform 6)

      		 -
      I52-21(ASEL) - I53-11(E)*3 Output LG - W-B Output wireless charging system

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly inside vehicle

      3. Engine switch off → Engine switch on (ACC)

      Below 1 V → 4.5 to 6 V

      (Engine switch on (ACC) for 1 second)

      		 -

      • *1: for LHD

      • *2: for RHD

      • *3: w/ Wireless Charging System

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

      Tech Tips


      • 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.

      Note

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


      1. B0059QGE07

        Waveform 1

        Item Content
        Tester Connection I51-14 (NE) - I53-11 (E)
        Tool Setting 2 V/DIV., 2 ms./DIV.
        Condition Idling (engine warmed up)

        Tech Tips

        The wavelength becomes shorter as the engine speed increases.

      2. B005A3EC22
        *a Steering lock motor not operating
        *b Steering lock motor operating

        Waveform 2

        Item Content
        Tester Connection I53-24 (SLR+) - I53-11 (E)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Condition Steering lock motor stopped → Steering lock motor operating → Steering lock motor stopped
      3. B005A3GE08

        Waveform 3

        Item Content
        Tester Connection I53-5 (SPD) - I53-11 (E)
        Tool Setting 5 V/DIV., 200 ms./DIV.
        Condition Vehicle being driven at approx. 5 km/h (3 mph)

        Tech Tips

        The wavelength becomes shorter as the vehicle speed increases.

      4. B0057FCC02
        *a For 30 seconds after closing any door using the door outside handle
        *b 30 seconds or more have elapsed after closing any door using the door outside handle

        Waveform 4

        Item Content
        Tester Connection

        I53-21 (CLG5) - I53-11 (E)

        I53-20 (CG5B) - I53-11 (E)

        I52-15 (CLG6) - I53-11 (E)

        I52-14 (CG6B) - I53-11 (E)

        I52-4 (CLG7) - I53-11 (E)

        I52-3 (CG7B) - I53-11 (E)
        Tool Setting 2 V/DIV., 500 ms/DIV.
        Condition

        Procedure:


        1. Engine switch off

        2. Electrical key transmitter sub-assembly not inside vehicle

        3. Within 30 seconds of closing any door using the door outside handle
      5. B00585HC12
        *a Before lock or unlock switch of electrical key transmitter sub-assembly pressed
        *b After lock or unlock switch of electrical key transmitter sub-assembly pressed

        Waveform 5

        Item Content
        Tester Connection I52-18 (RCO) - I53-11 (E)
        Tool Setting 2 V/DIV., 500 ms/DIV.
        Condition

        Procedure:


        1. Engine switch off

        2. Electrical key transmitter sub-assembly brought outside but kept inside wireless function operational area

        3. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed
      6. B00576IC12
        *a Before lock or unlock switch of electrical key transmitter sub-assembly pressed
        *b After lock or unlock switch of electrical key transmitter sub-assembly pressed

        Waveform 6

        Item Content
        Tester Connection I52-20 (RDAM) - I53-11 (E)
        Tool Setting 5 V/DIV., 500 ms/DIV.
        Condition

        Procedure:


        1. Engine switch off

        2. All doors locked

        3. Electrical key transmitter sub-assembly not inside vehicle

        4. Electrical key transmitter sub-assembly brought outside but kept inside wireless function operational area

        5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

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

    Click here

  3. CHECK ID CODE BOX (IMMOBILISER CODE ECU)

    Click here

  4. CHECK ENGINE SWITCH

    Click here