IMMOBILISER SYSTEM TERMINALS OF ECU


  1. CHECK ENGINE SWITCH

    A01QCF0N56

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

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      K35-6 (AGND) - Body ground - Y - Body ground Transponder key amplifier ground Always Below 1 Ω -
      K35-7 (TXCT) - K35-6 (AGND) Input V - Y Immobiliser communication input Engine switch off, brake pedal not depressed, 30 seconds or more elapsed after driver door opened and then closed Below 1 V -
      K35-8 (CODE) - K35-6 (AGND) Output G - Y Immobiliser communication output Engine switch off, brake pedal not depressed, 30 seconds or more elapsed after driver door opened and then closed Below 1 V -
      K35-10 (VC5) - K35-6 (AGND) Input L - Y Transponder key amplifier power supply Engine switch off, brake pedal not depressed, 30 seconds or more elapsed after driver door opened and then closed Below 1 V -

    2. Check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      K35-7 (TXCT) - K35-6 (AGND) Input V - Y

      Signal input from certification ECU (smart key ECU assembly)

      (Code sent from certification ECU (smart key ECU assembly) to transponder key amplifier built into engine switch, and then transmitted by transponder key amplifier antenna as radio waves)

      		 Engine switch off, key not in cabin, within 30 seconds after engine switch pressed

      Pulse generation

      (See waveform 1)

      • BCC Malfunction

      • Abnormal Status

      • Different Encrypt Code

      • Different Serial Number

      • Frame Error

      • Response

        Tech Tips

        If immobiliser key code verification communication is not performed correctly, the malfunction may be indicated by one or more of the Data List items listed above
      K35-8 (CODE) - K35-6 (AGND) Output G - Y

      Signal output to certification ECU (smart key ECU assembly)

      (Radio waves from transponder key amplifier built into engine switch used to detect key information. Key information then sent to certification ECU (smart key ECU assembly))

      		 Engine switch off, engine switch pressed with key held near engine switch*

      Pulse generation

      (See waveform 2)
      K35-10 (VC5) - K35-6 (AGND) Input L - Y

      Transponder key amplifier power supply

      (Power supplied from certification ECU (smart key ECU assembly) when transponder key amplifier built into engine switch activated)

      		 Engine switch off, key not in cabin, within 30 seconds after engine switch pressed

      Pulse generation

      (See waveform 3)

      Tech Tips

      *: Remove the transmitter battery before performing this inspection.

    3. Using an oscilloscope, check the waveform.

      Note

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


      1. A01Q9CBN18

        Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection K35-7 (TXCT) - K35-6 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Engine switch off, key not in cabin, within 30 seconds after engine switch pressed
      2. A01QD8ME05

        Waveform 2 (Reference)

        Measurement Condition
        Item Content
        Tester Connection K35-8 (CODE) - K35-6 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Engine switch off, engine switch pressed with key held near engine switch*

        Tech Tips

        *: Remove the transmitter battery before performing this inspection.

      3. A01Q9VSN05

        Waveform 3 (Reference)

        Measurement Condition
        Item Content
        Tester Connection K35-10 (VC5) - K35-6 (AGND)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Condition Engine switch off, key not in cabin, within 30 seconds after engine switch pressed

  2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    A01QC7PC04
    *A for LHD *B for RHD

    1. Disconnect the A21 certification ECU (smart key ECU assembly) connector.

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

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      A21-2 (+B) - A21-11 (E) Input W- W-B +B power supply Always 11 to 14 V -
      A21-11 (E) - Body ground - W-B - Body ground Ground Always Below 1 Ω -

    3. Reconnect the A21 certification ECU (smart key ECU assembly) connector.

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

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      K74-5 (IG) - A21-11 (E) Input B - W-B Ignition power supply Engine switch off → on (IG) Below 1 V → 11 to 14 V Ignition switch
      K74-9 (TXCT) - K74-24 (AGND) Output V - Y Signal output to transponder key amplifier Engine switch off, brake pedal not depressed, 30 seconds or more elapsed after driver door opened and then closed Below 1 V

      • BCC Malfunction

      • Abnormal Status

      • Different Encrypt Code

      • Different Serial Number

      • Frame Error

      • Response
      K74-7 (CODE) - K74-24 (AGND) Input G - Y Signal input from transponder key amplifier Engine switch off, brake pedal not depressed, 30 seconds or more elapsed after driver door opened and then closed Below 1 V
      K74-1 (VC5) - K74-24 (AGND) Output L - Y Transponder key amplifier power supply Engine switch off, brake pedal not depressed, 30 seconds or more elapsed after driver door opened and then closed Below 1 V
      K74-24 (AGND) - Body ground - Y - Body ground Transponder key amplifier ground Always Below 1 Ω
      K74-18 (IND) - A21-11 (E) Output LG - W-B Security indicator output Engine switch off → on (IG) Pulse generation → Below 2 V -

    5. Check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      K74-9 (TXCT) - K74-24 (AGND) Output V - Y

      Signal output to transponder key amplifier

      (Code sent from certification ECU (smart key ECU assembly) to transponder key amplifier built into engine switch, and then transmitted by transponder key amplifier antenna as radio waves)

      		 Engine switch off, key not in cabin, within 30 seconds after engine switch pressed

      Pulse generation

      (See waveform 1)

      • BCC Malfunction

      • Abnormal Status

      • Different Encrypt Code

      • Different Serial Number

      • Frame Error

      • Response
      K74-7 (CODE) - K74-24 (AGND) Input G - Y

      Signal input from transponder key amplifier

      (Radio waves from transponder key amplifier built into engine switch used to detect key information. Key information then sent to certification ECU (smart key ECU assembly))

      		 Engine switch off, engine switch pressed with key held near engine switch*

      Pulse generation

      (See waveform 2)
      K74-1 (VC5) - K74-24 (AGND) Output L - Y

      Transponder key amplifier power supply

      (Power supplied from certification ECU (smart key ECU assembly) when transponder key amplifier built into engine switch activated)

      		 Engine switch off, key not in cabin, within 30 seconds after engine switch pressed

      Pulse generation

      (See waveform 3)

      Tech Tips

      *: Remove the transmitter battery before performing this inspection.

    6. Using an oscilloscope, check the waveform.

      Note

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


      1. A01Q9CBN19

        Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection K74-9 (TXCT) - K74-24 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Engine switch off, key not in cabin, within 30 seconds after engine switch pressed
      2. A01QD8ME05

        Waveform 2 (Reference)

        Measurement Condition
        Item Content
        Tester Connection K74-7 (CODE) - K74-24 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Engine switch off, engine switch pressed with key held near engine switch*

        Tech Tips

        *: Remove the transmitter battery before performing this inspection.

      3. A01Q9VSN06

        Waveform 3 (Reference)

        Measurement Condition
        Item Content
        Tester Connection K74-1 (VC5) - K74-24 (AGND)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Condition Engine switch off, key not in cabin, within 30 seconds after engine switch pressed

  3. CHECK ID CODE BOX (IMMOBILISER CODE ECU)

    A01QD9YN74

    1. Disconnect the K60 ID code box (immobiliser code ECU) connector.

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

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      K60-1 (+B) - Body ground Input GR - Body ground +B power supply Always 11 to 14 V B2789
      K60-5 (GND) - Body ground - W-B - Body ground Ground Always Below 1 Ω B2789

    3. Reconnect the K60 ID code box (immobiliser code ECU) connector.

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

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      K60-3 (EFII) - K60-5 (GND) Input L - W-B

      SFI communication input

      (Signal input from ECM to ID code box (immobiliser code ECU))

      		 Engine switch off 11 to 14 V

      • B2799

      • B279A

      • EFI Code Receive

      • Engine Start Request
      K60-4 (EFIO) - K60-5 (GND) Output LG - W-B

      SFI communication output

      (Signal output from ID code box (immobiliser code ECU) to ECM)

      		 Engine switch off 11 to 14 V
      K60-3 (EFII) - K60-5 (GND) Input L - W-B

      SFI communication input

      (Signal input from ECM to ID code box (immobiliser code ECU))

      		 Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

      Pulse generation

      (See waveform 1)
      K60-4 (EFIO) - K60-5 (GND) Output LG - W-B

      SFI communication output

      (Signal output from ID code box (immobiliser code ECU) to ECM)

      		 Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

      Pulse generation

      (See waveform 2)

    5. Using an oscilloscope, check the waveform.

      Note

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


      1. Waveform 1 (Reference)

        A01QBH1C03
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection K60-3 (EFII) - K60-5 (GND)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

      2. Waveform 2 (Reference)

        A01QC1OC02
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection K60-4 (EFIO) - K60-5 (GND)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

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

    A01QCQIN99

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

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      K20-1 (GND) - Body ground - W-B - Body ground Ground Always Below 1 Ω -
      K20-3 (IGE) - K20-1 (GND) Input W - W-B Steering lock motor operation permission signal (motor operation permission signal supplied by certification ECU (smart key ECU assembly))

      Steering lock motor operates when both conditions met, and then door opened:


      • Shift lever in P

      • Electrical key transmitter sub-assembly carried, engine switch turned on (IG), steering unlocked, and then engine switch turned off

      Pulse generation

      (See waveform 1)

      • Power Supply Short

      • Unlock Request Receive

      • Lock Request Receive
      K20-4 (SLP1) - K20-1 (GND) Output L - W-B Steering lock bar position signal (signal output from steering unlock sensor) Steering locked → unlocked* 11 to 14 V → Below 1.2 V Sensor Value
      K20-6 (IG2) - K20-1 (GND) Input B - W-B IG signal (IG2 power supply input for steering lock motor) Engine switch off → on (IG) Below 1 V → 11 to 14 V B2788
      K20-7 (B) - Body ground Input W - Body ground Constant power supply Always 11 to 14 V B2788

      Tech Tips

      *: The steering locks when any door is opened with the shift lever in P and the engine switch off. The steering unlocks when the engine switch is turned on (ACC).

    2. Using an oscilloscope, check the waveform.

      Note

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


      1. A01QBSUC03
        *a Steering lock motor not operating
        *b Steering lock motor operating

        Waveform 1 (Reference)

        Measurement Condition
        Item Content
        Tester Connection K20-3 (IGE) - K20-1 (GND)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Condition

        Steering lock motor operates when both conditions met, and then door opened:


        • Shift lever in P

        • Electrical key transmitter sub-assembly carried, engine switch turned on (IG), steering unlocked, and then engine switch turned off

  5. CHECK ECM

    B002EX9N01

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

      Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item/DTC
      A12-6 (+B2) - E3-1 (E1) Input P - W-B Ignition power supply Engine switch on (IG) 11 to 14 V -
      A12-7 (+B) - E3-1 (E1) Input Y - W-B Ignition power supply Engine switch on (IG) 11 to 14 V -
      A12-3 (MREL) - E2-2 (E01) Input Y - W-B Ignition power supply Engine switch on (IG) 11 to 14 V -
      A12-5 (BATT) - E3-1 (E1) Input L - W-B +B power supply Always 11 to 14 V -
      E2-2 (E01) - Body ground - W-B - Body ground Ground Always Below 1 Ω -
      E3-1(E1) - Body ground - W-B - Body ground Ground Always Below 1 Ω -
      E2-1 (E02) - Body ground - W-B - Body ground Ground Always Below 1 Ω -
      E1-1 (+BM) - E3-1 (E1) Input L - W-B +B power supply Always 11 to 14 V
      A12-9 (IMO) - E3-1 (E1) Output P - W-B ID code box (immobiliser code ECU) communication output Engine switch off 11 to 14 V -
      A12-9 (IMO) - E3-1 (E1) Output P - W-B ID code box (immobiliser code ECU) communication output Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

      Pulse generation

      (See waveform 1)

      		 -
      A12-8 (IMI) - E3-1 (E1) Input LG - W-B ID code box (immobiliser code ECU) communication input Engine switch off 11 to 14 V -
      A12-8 (IMI) - E3-1 (E1) Input LG - W-B ID code box (immobiliser code ECU) communication input Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

      Pulse generation

      (See waveform 2)

      		 -

    2. Using an oscilloscope, check the waveform.

      Note

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


      1. Waveform 1 (Reference)

        A01QBH1C03
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection A12-9 (IMO) - E3-1 (E1)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

      2. Waveform 2 (Reference)

        A01QC1OC02
        *a Approximately 160 ms *b Approximately 270 ms
        Measurement Condition
        Item Content
        Tester Connection A12-8 (IMI) - E3-1 (E1)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected