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


  1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    B003RYUE02

    1. Disconnect the G16 and G17 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
      G17-37 (STA) - Body ground Input G - 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 -
      G17-16 (STAR) - Body ground*1 Input/Output L - 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
      G17-16 (STAR) - Body ground*2 Input/Output L - 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.)

      		 Clutch pedal released → Clutch pedal depressed 10 kΩ or higher → 93.75 to 136.36 Ω -

      Receives clutch start switch signal


      • Monitors whether the clutch start switch is on (clutch pedal depressed) or off (clutch pedal released). Applies voltage via a resistor (large) in the certification ECU (smart key ECU assembly). When the clutch 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 clutch start switch is off, the voltage will be high (9 V or more).

      Perform the following operations except while the engine is cranking:


      • Clutch pedal released → Clutch pedal depressed

      		 30 kΩ or higher → 93.75 to 136.36 Ω Neutral SW/ Clutch SW
      G16-6 (NE) - Body ground Input B - Body ground Engine speed signal Always 10 kΩ or higher Engine Condition
      G16-11 (STP1) - Body ground*1 Input L - Body ground Stop light switch signal Brake pedal depressed → Brake pedal released 9 V or higher → 1 V or less Stop Light Switch1
      G16-1 (+B) - G16-10 (E) Input P - BR Power source Always 11 to 14 V -
      G16-22 (SLP) - G16-10 (E) Input R - BR Steering lock position signal Steering locked 10 kΩ or higher Steering Unlock Switch
      G16-8 (P) - G16-10 (E)*1 Input Y - BR P position signal Shift lever in P → Shift lever not in P 30 kΩ or higher → Below 200 Ω Shift P Signal
      G16-10 (E) - Body ground - BR - Body ground GND Always Below 1 Ω -
      G16-16 (SSW2) - Body ground Input W - 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
      G16-18 (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
      G16-21 (ACCD) - Body ground Output B - Body ground ACC signal 20°C (68°F) 163 to 238 Ω ACC Relay Monitor
      G16-20 (IG1D) - Body ground Output L - Body ground IG1 signal 20°C (68°F) 54.32 to 79.32 Ω IG1 Relay Monitor(Outside)
      G17-33 (CUTB) - G16-10 (E) Input W - BR Dark current cut pin*3 Always 11 to 14 V -
      G16-7 (SPD) - Body ground Input V - Body ground Vehicle speed signal Always 30 kΩ or higher Vehicle Speed Signal

      • *1: for Automatic Transmission

      • *2: for Manual Transmission

      • *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.

    3. Reconnect the G16 and G17 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
      G17-37 (STA) - G16-10 (E) Input G - BR 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 approximately 1 second has elapsed, the engine switch is released (starter off) 6 V or higher*3 → 1.5 V or less -
      G17-16 (STAR) - G16-10 (E)*1 Input/Output L - BR

      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.

      		 With the brake pedal depressed, the engine switch is pressed and held → After approximately 1 second has elapsed, the engine switch is released 6 V or higher*3 → 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 (at 20°C (68°F))

      		 9 V or higher → 2.7 V or less Neutral SW/ Clutch SW
      G17-16 (STAR) - G16-10 (E)*2 Input/Output L - BR

      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.

      		 With the clutch pedal depressed, the engine switch is pressed and held → After approximately 1 second has elapsed, the engine switch is released 6 V or higher*3 → 1.5 V or less -

      Receives clutch start switch signal


      • Monitors whether the clutch start switch is on (clutch pedal depressed) or off (clutch pedal released). Applies voltage via a resistor (large) in the certification ECU (smart key ECU assembly). When the clutch 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 clutch start switch is off, the voltage will be high (9 V or more).

      Perform the following operations except while the engine is cranking:


      • Clutch pedal released → Clutch pedal depressed

      		 9 V or higher → 2.7 V or less Neutral SW/ Clutch SW
      G16-6 (NE) - G16-10 (E) Input B - BR Engine speed signal Idling (engine warmed up)

      Pulse generation

      (See waveform 1)

      		 Engine Condition
      G16-11 (STP1) - G16-10 (E)*1 Input L - BR Stop light switch signal Brake pedal released → Brake pedal depressed 1 V or less → 9 V or higher Stop Light Switch1
      G16-22 (SLP) - G16-10 (E) Input R - BR Steering lock position signal Steering wheel locked → Steering wheel unlocked 11 to 14 V → 1.2 V or less Steering Unlock Switch
      G16-17 (SLR+) - G16-10 (E) Output L - 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

      Pulse generation

      (See waveform 2)

      		 -
      G16-8 (P) - G16-10 (E)*1 Input Y - 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
      G16-16 (SSW2) - G16-10 (E) Input W - BR

      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
      G16-18 (SSW1) - G16-10 (E) Input V - BR SSW1 contact signal Engine switch not pushed → Engine switch pushed 9 V or higher → 1 V or less Start Switch1
      G16-21 (ACCD) - G16-10 (E) Output B - BR ACC signal Engine switch off → Engine switch on (ACC) 1 V or less → 8.5 V or higher ACC Relay Monitor
      G16-20 (IG1D) - G16-10 (E) Output L - BR IG1 signal Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher IG1 Relay Monitor(Outside)
      G16-7 (SPD) - G16-10 (E) Input V - BR Vehicle speed signal Vehicle being driven at approximately 5 km/h (3 mph)

      Pulse generation

      (See waveform 3)

      		 Vehicle Speed Signal
      G17-31 (CLG1) - G16-10 (E) Input/Output Y - BR Output to No. 1 indoor electrical key antenna assembly (front floor)

      Procedure:


      1. All doors closed

      2. Engine switch off

      3. Electrical key transmitter sub-assembly not inside vehicle

      4. Door is open

      5. Door is closed

      6. Within 30 seconds

      		 Pulse generation (See waveform 4) Overhead + Room (key diagnostic mode)
      G17-30 (CG1B) - G16-10 (E) Input/Output L - BR Output to No. 1 indoor electrical key antenna assembly (front floor) (terminal on opposite side of component from CLG1 output terminal)

      Procedure:


      1. All doors closed

      2. Engine switch off

      3. Electrical key transmitter sub-assembly not inside vehicle

      4. Door is open

      5. Door is closed

      6. Within 30 seconds

      		 Pulse generation (See waveform 4) Overhead + Room (key diagnostic mode)
      G17-6 (CLG2) - G16-10 (E) Input/Output W - BR Output to No. 2 indoor electrical key antenna assembly (rear floor)

      Procedure:


      1. All doors closed

      2. Engine switch off

      3. Electrical key transmitter sub-assembly not inside vehicle

      4. Door is open

      5. Door is closed

      6. Within 30 seconds

      		 Pulse generation (See waveform 4) Overhead + Room2 (key diagnostic mode)
      G17-23 (CG2B) - G16-10 (E) Input/Output B - BR Output to No. 2 indoor electrical key antenna assembly (rear floor) (terminal on opposite side of component from CLG2 output terminal)

      Procedure:


      1. All doors closed

      2. Engine switch off

      3. Electrical key transmitter sub-assembly not inside vehicle

      4. Door is open

      5. Door is closed

      6. Within 30 seconds

      		 Pulse generation (See waveform 4) Overhead + Room2 (key diagnostic mode)
      G17-28 (CLG7) - G16-10 (E) Input/Output R - BR Output to No. 2 indoor electrical key antenna assembly (inside luggage)

      Procedure:


      1. All doors closed

      2. Engine switch off

      3. Electrical key transmitter sub-assembly not inside vehicle

      4. Door is open

      5. Door is closed

      6. Within 30 seconds

      		 Pulse generation (See waveform 4) Overhead + Room3 (key diagnostic mode)
      G17-29 (CG7B) - G16-10 (E) Input/Output G - BR Output to No. 2 indoor electrical key antenna assembly (inside luggage) (terminal on opposite side of component from CLG7 output terminal)

      Procedure:


      1. All doors closed

      2. Engine switch off

      3. Electrical key transmitter sub-assembly not inside vehicle

      4. Door is open

      5. Door is closed

      6. Within 30 seconds

      		 Pulse generation (See waveform 4) Overhead + Room3 (key diagnostic mode)

      • *1: for Automatic Transmission

      • *2: for Manual Transmission

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

      Tech Tips


      • When the engine switch is turned off with the shift lever in P (for Automatic Transmission) 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.

      • 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 (for Automatic Transmission).

        • The engine switch is off.

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

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


      1. B003NTRE04

        Waveform 1

        Item Content
        Tester Connection G16-6 (NE) - G16-10 (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. B003QSFC33
        *a Steering lock motor not operating
        *b Steering lock motor operating

        Waveform 2

        Item Content
        Tester Connection G16-17 (SLR+) - G16-10 (E)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Vehicle Condition

        Steering lock motor stopped →

        Steering lock motor operating →

        Steering lock motor stopped*1

        Tech Tips

        *1: 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 (for Automatic Transmission).

        • 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.

      3. B003Q8LE03

        Waveform 3

        Item Content
        Tester Connection G16-7 (SPD) - G16-10 (E)
        Tool Setting 5 V/DIV., 20 ms./DIV.
        Vehicle Condition Vehicle being driven at approximately 5 km/h (3 mph)

        Tech Tips

        The wavelength becomes shorter as the vehicle speed increases.

      4. B003KS7C03
        *a Door open
        *b After approximately 30 seconds from when the door is closed

        Waveform 4

        Item Content
        Tester Connection

        G17-31 (CLG1) - G16-10 (E)

        G17-30 (CG1B) - G16-10 (E)

        G17-6 (CLG2) - G16-10 (E)

        G17-23 (CG2B) - G16-10 (E)

        G17-28 (CLG7) - G16-10 (E)

        G17-29 (CG7B) - G16-10 (E)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Vehicle Condition

        Procedure:


        1. All doors closed

        2. Engine switch off

        3. Electrical key transmitter sub-assembly not inside vehicle

        4. Door is open

        5. Door is closed

        6. Within 30 seconds