PUSH-BUTTON START TERMINALS OF ECU


  1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    B002EKSC19
    *A for LHD *B for RHD

    1. Disconnect the A21 and K74 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
      A21-7 (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) 100 to 150 Ω -
      A21-5 (STAR) - Body ground Input/Output G - Body ground

        Outputs voltage to the starter relay:

      • Outputs voltage (12 V) to the starter relay when starting the engine. (Max. 30 seconds 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 →100 to 150 Ω -
      A21-5 (STAR) - Body ground Input/Output G - Body ground

        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 → 100 to 150 Ω

      Neutral SW/

      Clutch SW
      A21-16 (NE) - Body ground Input W - Body ground Engine speed signal Always 10 kΩ or higher Engine Condition
      A21-9 (IG2D) - Body ground Output B - Body ground IG2 signal 20°C (68°F) 500 to 750 Ω IG2 Relay Monitor (Outside)
      A21-18 (STP1) - Body ground Input

      L - Body ground*1

      R - Body ground*2

      		 Stop light switch signal Brake pedal released → Brake pedal depressed 9 V or higher → 1 V or less Stop Light Switch1
      A21-2 (+B) - A21-11 (E) Input W - W-B Power source Always 11 to 14 V -
      K74-26 (SLP) - A21-11 (E) Input L - W-B Steering lock position signal Always 10 kΩ or higher Steering Unlock Switch
      K74-25 (P) - A21-11 (E) Input G - 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
      A21-11 (E) - Body ground - W-B - Body ground GND Always Below 1 Ω -
      K74-30 (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 1 Ω → 10 kΩ or higher Start Switch2
      K74-28 (SSW1) - Body ground Input V - Body ground SSW1 contact signal Engine switch pushed → Engine switch not pushed Below 1 Ω → 10 kΩ or higher Start Switch1
      K74-4 (ACCD) - Body ground Output Y - Body ground ACC signal 20°C (68°F) 181.81 to 272.72 Ω ACC Relay Monitor
      K74-6 (IG1D) - Body ground Output L - Body ground IG1 signal 20°C (68°F) 45.45 to 68.18 Ω IG1 Relay Monitor (Outside)
      A21-10 (CUTB) - A21-11 (E) Input

      P - W-B*1

      B - W-B*2

      		 Dark current cut pin*3 Always 11 to 14 V -
      K74-27 (SPD) - Body ground Input SB - Body ground 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 A21 and K74 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
      A21-7 (STA) - A21-11 (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*3 → 1.5 V or less -
      A21-5 (STAR) - A21-11 (E) Input/Output G - 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*5 → 1.5 V or less -
      A21-5 (STAR) - A21-11 (E) Input/Output G - W-B

        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
      A21-16 (NE) - A21-11 (E) Input W - W-B Engine speed signal Idling (engine warmed up) Pulse generation (See waveform 1) Engine Condition
      A21-9 (IG2D) - A21-11 (E) Output B - W-B IG2 signal Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher IG2 Relay Monitor (Outside)
      A21-18 (STP1) - A21-11 (E) Input

      L - W-B*1

      R - W-B*2

      		 Stop light switch signal Brake pedal released → Brake pedal depressed 1 V or less → 9 V or higher Stop Light Switch1
      K74-26 (SLP) - A21-11 (E) Input L - W-B Steering lock position signal Steering wheel locked → Steering wheel unlocked*4 11 to 14 V → 1.2 V or less Steering Unlock Switch
      K74-29 (SLR+) - A21-11 (E) Output W - W-B 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*5 Pulse generation (See waveform 2) -
      K74-25 (P) - A21-11 (E) Input G - W-B P position signal Shift lever in P → Shift lever not in P 9 V or higher → 2.7 V or less Shift P Signal
      K74-30 (SSW2) - A21-11 (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
      K74-28 (SSW1) - A21-11 (E) Input V - W-B SSW1 contact signal Engine switch not pushed → Engine switch pushed 9 V or higher → 1 V or less Start Switch1
      K74-4 (ACCD) - A21-11 (E) Output Y - W-B ACC signal Engine switch off → Engine switch on (ACC) 1 V or less → 8.5 V or higher ACC Relay Monitor
      K74-6 (IG1D) - A21-11 (E) Output L - W-B IG1 signal Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher IG1 Relay Monitor (Outside)
      K74-27 (SPD) - A21-11 (E) Input SB - W-B Vehicle speed signal Vehicle being driven at approximately 5 km/h (3 mph) Pulse generation (See waveform 3) Vehicle Speed Signal
      K74-3 (CLG5) - A21-11 (E) Output GR - 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. Door is open

      4. Door is closed

      5. Within 30 seconds

      		 Pulse generation (See waveform 4) Over Head + Front Room (key diagnostic mode)
      K74-2 (CG5B) - A21-11 (E) Output B - 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. Door is open

      4. Door is closed

      5. Within 30 seconds

      		 Pulse generation (See waveform 4) Over Head + Front Room (key diagnostic mode)

      T1-11 (CLG6) - A21-11 (E)*1

      U1-11 (CLG6) - A21-11 (E)*2

      		 Output Y - 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. Door is open

      4. Door is closed

      5. Within 30 seconds

      		 Pulse generation (See waveform 4) Over Head + Rear Room (key diagnostic mode)

      T1-10 (CG6B) - A21-11 (E)*1

      U1-10 (CG6B) - A21-11 (E)*2

      		 Output L - 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. Door is open

      4. Door is closed

      5. Within 30 seconds

      		 Pulse generation (See waveform 4) Over Head + Rear Room (key diagnostic mode)

      T1-9 (CLG7) - A21-11 (E)*1

      U1-9 (CLG7) - A21-11 (E)*2

      		 Output P - W-B Output to No. 3 indoor electrical key antenna assembly (inside luggage)

      Proceed:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. All doors closed

      4. Driver door lock sensor not touched → touched

      		 Pulse generation (See waveform 5) Over Head + Luggage (inside) (key diagnostic mode)

      T1-8 (CG7B) - A21-11 (E)*1

      U1-8 (CG7B) - A21-11 (E)*2

      		 Output W - W-B Output to No. 3 indoor electrical key antenna assembly (inside luggage) (terminal on opposite side of component from CLG7 output terminal)

      Proceed:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. All doors closed

      4. Driver door lock sensor not touched → touched

      		 Pulse generation (See waveform 5) Over Head + Luggage (inside) (key diagnostic mode)

      T1-5 (RCO) - A21-11 (E)*1

      U1-5 (RCO) - A21-11 (E)*2

      		 Output

      SB - W-B*1

      LG - W-B*2

      Output to electrical key and TPMS receiver assembly

      (Power supply for electrical key and TPMS receiver assembly. Certification ECU (smart key ECU assembly) outputs 5 V when receiver starts operating.)

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly brought outside vehicle

      3. Electrical key transmitter sub-assembly brought outside detection area*3 but kept inside wireless function operational area*4

      4. Lock or unlock switches of electrical key transmitter sub-assembly not pressed → pressed

      		 Pulse generation (See waveform 6) -

      T1-17 (RDAM) - A21-11 (E)*1

      U1-17 (RDAM) - A21-11 (E)*2

      		 Input

      LG - W-B*1

      R - W-B*2

      		 Electrical key and TPMS receiver assembly verifies data received from electrical key transmitter sub-assembly. Electrical key and TPMS receiver assembly sends data to ECU and intermittently grounds 12 V signal from certification ECU (smart key ECU assembly).

      Procedure:


      1. Engine switch off

      2. All doors locked

      3. Electrical key transmitter sub-assembly brought outside detection area*3 but kept inside wireless function operational area*4

      4. Lock or unlock switches of electrical key transmitter sub-assembly not pressed → pressed

      		 Pulse generation (See waveform 7) -

      T1-6 (CSEL) - A21-11 (E)*1

      U1-6 (CSEL) - A21-11 (E)*2

      		 Output P - W-B Communication channel switching circuit.

      Procedure:


      1. Engine switch off

      2. All doors closed

      		 Below 1 V → 4.5 to 6 V → Below 1 V Key diagnostic mode

      • *1: for LHD

      • *2: for RHD

      Tech Tips


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

      • *4: When the engine 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 engine switch is turned on (ACC) or on (IG), the steering wheel will be unlocked.

      • *5: 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 engine switch is turned on (IG) and the steering is unlocked.

        • The engine switch is off.

    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. B002EI0E01

        Waveform 1

        Item Content
        Tester Connection A21-16 (NE) - A21-11 (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. B002ET7C32
        *a Steering lock motor not operating
        *b Steering lock motor operating

        Waveform 2

        Item Content
        Tester Connection K74-29 (SLR+) - A21-11 (E)
        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 engine switch is off.

        • The shift lever is in P.

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

      3. B002F0VE01

        Waveform 3

        Item Content
        Tester Connection K74-27 (SPD) - A21-11 (E)
        Tool Setting 5 V/DIV., 20 ms./DIV.
        Vehicle Condition Engine switch on (IG), vehicle being driven at approximately 5 km/h (3 mph)

        Tech Tips

        The wavelength becomes shorter as the vehicle speed increases.

    6. B002ENBC30
      *a Door open
      *b After approximately 30 seconds from when the door is closed

      Using an oscilloscope, check waveform 4.

      Tech Tips

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

      Waveform 4 (Reference)
      Item Content
      Tester Connection

      • K74-3 (CLG5) - A21-11 (E)

      • K74-2 (CG5B) - A21-11 (E)

      • T1-11 (CLG6) - A21-11 (E)*1

      • T1-10 (CG6B) - A21-11 (E)*1

      • U1-11 (CLG6) - A21-11 (E)*2

      • U1-10 (CG6B) - A21-11 (E)*2
      Tool Setting 2 V/DIV., 500 ms./DIV.
      Condition

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. Door is open

      4. Door is closed

      5. Within 30 seconds

      • *1: for LHD

      • *2: for RHD

    7. B002CNQC18
      *a Before driver door lock sensor touched
      *b After driver door lock sensor touched

      Using an oscilloscope, check waveform 5.

      Tech Tips

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

      Waveform 5 (Reference)
      Item Content
      Tester Connection

      • T1-9 (CLG7) - A21-11 (E)*1

      • T1-8 (CG7B) - A21-11 (E)*1

      • U1-9 (CLG7) - A21-11 (E)*2

      • U1-8 (CG7B) - A21-11 (E)*2
      Tool Setting 2 V/DIV., 500 ms./DIV.
      Condition

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. All doors closed

      4. Driver door lock sensor not touched → touched

      • *1: for LHD

      • *2: for RHD

    8. B002DUGC28
      *a Before lock or unlock switches of electrical key transmitter sub-assembly pressed
      *b After lock or unlock switches of electrical key transmitter sub-assembly pressed

      Using an oscilloscope, check waveform 6.

      Tech Tips

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

      Waveform 6 (Reference)
      Item Content
      Tester Connection

      • T1-5 (RCO) - A21-11 (E)*1

      • U1-5 (RCO) - A21-11 (E)*2
      Tool Setting 2 V/DIV., 500 ms./DIV.
      Condition

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly brought outside vehicle

      3. Electrical key transmitter sub-assembly brought outside detection area*3 but kept inside wireless function operational area*4

      4. Lock or unlock switches of electrical key transmitter sub-assembly not pressed → pressed

      • *1: for LHD

      • *2: for RHD

      • *3: For details about the areas that are outside the entry function detection area, refer to Operation Check

        Click here

      • *4: For details about the areas that are inside the wireless function operational area, refer to Operation Check

        Click here

    9. B002DVSC31
      *a Before lock or unlock switches of electrical key transmitter sub-assembly pressed
      *b After lock or unlock switches of electrical key transmitter sub-assembly pressed

      Using an oscilloscope, check waveform 7.

      Tech Tips

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

      Waveform 7 (Reference)
      Item Content
      Tester Connection

      • T1-17 (RDAM) - A21-11 (E)*1

      • U1-17 (RDAM) - A21-11 (E)*2
      Tool Setting 5 V/DIV., 500 ms./DIV.
      Condition

      Proceed:


      1. Engine switch off

      2. All doors locked

      3. Electrical key transmitter sub-assembly brought outside detection area*3 but kept inside wireless function operational area*4

      4. Lock or unlock switches of electrical key transmitter sub-assembly not pressed → pressed

      • *1: for LHD

      • *2: for RHD

      • *3: For details about the areas that are outside the entry function detection area, refer to Operation Check

        Click here

      • *4: For details about the areas that are inside the wireless function operational area, refer to Operation Check

        Click here

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

    Click here

  3. CHECK ID CODE BOX (IMMOBILISER CODE ECU)

    Click here