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Home >> Subaru >> 2019 >> BRZ Limited, Automatic Trans >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Engine Immobilizer System (W/ Entry Start) (Diagnostics And Symptom Tests) >> Engine Immobilizer System (With Entry & Start System) >> ECM Terminal Arrangement

ECM Terminal Arrangement

  1. Check the engine switch.
    1. Measure the resistance and voltage based on the following table.
      G12589397Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. (symbol) Input/output Terminal description Conditions Specified condition Related [Data monitor] item/DTC
      D25-6 (AGND) - Chassis ground - Transponder key amplifier GND-output short Always 1Ω or less -
      D25-7 (TXCT) - D25-6 (AGND) Input Clock signal When IG OFF, and the brake pedal(1) or clutch pedal(2) is depressed, and after 30 seconds or more have passed after the driver opens and closes the door. 1 V or less -
      D25-8 (CODE) - D25-6 (AGND) Input/output Dual directional data communication When IG OFF, and the brake pedal(1) or clutch pedal(2) is depressed, and after 30 seconds or more have passed after the driver opens and closes the door. 1 V or less -
      D25-10 (VC5) - D25-6 (AGND) Input Transponder key amplifier power supply When IG OFF, and the brake pedal(1) or clutch pedal(2) is depressed, and after 30 seconds or more have passed after the driver opens and closes the door. 1 V or less -
      (1) With automatic transmission

      (2) With manual transmission
    2. Confirm the pulse based on the following table.
      Terminal No. (symbol) Input/output Terminal description Conditions Specified condition Related [Data monitor] item/DTC
      D25-7 (TXCT) - D25-6 (AGND) Input Clock signal IG is turned OFF, the key is brought outside the vehicle, and within 30 seconds after the engine switch is pushed. Pulse generation (Refer to waveform 1, see Fig 1)  
      • BCC fault
      • Abnormal condition
      • Different encryption code
      • Different serial code
      NOTE: If the immobilizer key code collation communication is not operated correctly, the fault may be displayed in one or several items listed in the [Data monitor] described above.
      D25-8 (CODE) - D25-6 (AGND) Output Dual directional data communication IG is turned to OFF, the key is held above the engine switch, and the engine switch is pushed*. Pulse generation (Refer to waveform 2, see Fig 2)
      D25-10 (VC5) - D25-6 (AGND) Input Transponder key amplifier power supply IG is turned OFF, the key is brought outside the vehicle, and within 30 seconds after the engine switch is pushed. Pulse generation (Refer to waveform 3, see Fig 3)
      NOTE: *: Before performing this inspection, remove the transmitter battery.
    3. Inspect using an oscilloscope.
      CAUTION: The waveform shown in the figure is an example for reference. The noise and chattering are not shown in the figure.
      1. Waveform 1 (reference)
        PART DESCRIPTION - MEASURING CONDITIONS

        Item Contents
        Tester connection D25-7 (TXCT) - D25-6 (AGND)
        Tool setting 2V/DIV., 200ms./DIV.
        Conditions IG is turned OFF, the key is brought outside the vehicle, and within 30 seconds after the engine switch is pushed.
        Fig 1: Waveform 1
        G12589398Courtesy of SUBARU OF AMERICA, INC.
      2. Waveform 2 (reference)
        Fig 2: Waveform 2
        G12589399Courtesy of SUBARU OF AMERICA, INC.
        PART DESCRIPTION - MEASURING CONDITIONS

        Item Contents
        Tester connection D25-8 (CODE) - D25-6 (AGND)
        Tool setting 2V/DIV., 200ms./DIV.
        Conditions IG is turned to OFF, the key is held above the engine switch, and the engine switch is pushed*.
        NOTE: *: Before performing this inspection, remove the transmitter battery.
      3. Waveform 3 (reference)
        PART DESCRIPTION - MEASURING CONDITIONS

        Item Contents
        Tester connection D25-10 (VC5) - D25-6 (AGND)
        Tool setting 2V/DIV., 200ms./DIV.
        Conditions IG is turned OFF, the key is brought outside the vehicle, and within 30 seconds after the engine switch is pushed.
        Fig 3: Waveform 3
        G12589400Courtesy of SUBARU OF AMERICA, INC.
  2. Check the collation ECM (smart key ECM ASSY).
    G12589401Courtesy of SUBARU OF AMERICA, INC.
    1. Disconnect the D48 collation ECM (smart key ECM ASSY) connector.
    2. Measure the resistance and voltage based on the following table.
      Terminal No. (symbol) Input/output Terminal description Conditions Specified condition Related [Data monitor] item/DTC
      D48-2 (+B) - D48- 11 (GND) Input +B power supply Always 11 to 14 V -
      D48-11 (GND) - Chassis ground - Ground Always 1 Ω or less -
    3. Reconnect the D48 connector of the collation ECM (smart key ECM ASSY).
    4. Measure the resistance and voltage based on the following table.
      Terminal No. (symbol) Input/output Terminal description Conditions Specified condition Related [Data monitor] item/DTC
      D41-5 (IG2) - D48-11 (GND) Input Engine switch power supply Engine switch OFF →ON (IG) 1V or less →11 to 14V [Ignition]
      D41-9 (TXCT) - D41-24 (AGND) Output Clock signal When IG OFF, and the brake pedal(1) or clutch pedal(2) is depressed, and after 30 seconds or more have passed after the driver opens and closes the door. 1 V or less  
      • BCC fault
      • Abnormal condition
      • Different encryption code
      • Different serial code
      D41-7 (CODE) - D41-24 (AGND) Input Signal input from transponder key amplifier power When IG OFF, and the brake pedal(1) or clutch pedal(2) is depressed, and after 30 seconds or more have passed after the driver opens and closes the door. 1 V or less
      D41-1 (VC5) - D41-24 (AGND) Output Transponder key amplifier power supply When IG OFF, and the brake pedal(1) or clutch pedal(2) is depressed, and after 30 seconds or more have passed after the driver opens and closes the door. 1 V or less
      D41-24 (AGND) - chassis ground - Transponder key amplifier GND-out-put short Always 1Ω or less
      D48-13 (EFIO) -D48-11 (GND)(3) Input/output EFI communication signal (from collation ECM (smart key ECM ASSY) to ECM) IG ON 11 to 14V  
      • B1571
      • B1572
      • Engine start request
      • EFI code reception
      (1) With automatic transmission

      (2) With manual transmission

      (3) Without ID code box
    5. Confirm the pulse based on the following table.
      Terminal No. (symbol) Input/output Terminal description Conditions Specified condition Related [Data monitor] item/DTC
      D41-9 (TXCT) - D41-24 (AGND) Output Clock signal IG is turned OFF, the key is brought outside the vehicle, and within 30 seconds after the engine switch is pushed. Pulse generation (Refer to waveform 1, see Fig 4)  
      • BCC fault
      • Abnormal condition
      • Different encryption code
      • Different serial code
      D41-7 (CODE) - D41-24 (AGND) Input Signal input from transponder key amplifier power IG is turned to OFF, the key is held above the engine switch, and the engine switch is pushed(1). Pulse generation (Refer to waveform 2, see Fig 5)
      D41-1 (VC5) - D41-24 (AGND) Output Transponder key amplifier power supply IG is turned OFF, the key is brought outside the vehicle, and within 30 seconds after the engine switch is pushed. Pulse generation (Refer to waveform 3, see Fig 6)
      D48-13 (EFIO) -D48-11 (GND)(2) Input/output EFI communication signal (from collation ECM (smart key ECM ASSY) to ECM) Engine switch OFF →ON (IG) Pulse generation (Refer to waveform 4, see Fig 7)  
      • B1571
      • B1572
      • Engine start request
      • EFI code reception
      (1) Before performing this inspection, remove the transmitter battery.

      (2) Without ID code box
    6. Inspect using an oscilloscope.
      CAUTION: The waveform shown in the figure is an example for reference. The noise and chattering are not shown in the figure.
      1. Waveform 1 (reference)
        PART DESCRIPTION - MEASURING CONDITIONS

        Item Contents
        Tester connection D41-9 (TXCT) - D41-24 (AGND)
        Tool setting 2V/DIV., 200ms./DIV.
        Conditions IG is turned OFF, the key is brought outside the vehicle, and within 30 seconds after the engine switch is pushed.
        Fig 4: Waveform 1
        G12589402Courtesy of SUBARU OF AMERICA, INC.
      2. Waveform 2 (reference)
        Fig 5: Waveform 2
        G12589403Courtesy of SUBARU OF AMERICA, INC.
        PART DESCRIPTION - MEASURING CONDITIONS

        Item Contents
        Tester connection D41-7 (CODE) - D41-24 (AGND)
        Tool setting 2V/DIV., 200ms./DIV.
        Conditions IG is turned to OFF, the key is held above the engine switch, and the engine switch is pushed*.
        NOTE: *: Before performing this inspection, remove the transmitter battery.
      3. Waveform 3 (reference)
        PART DESCRIPTION - MEASURING CONDITIONS

        Item Contents
        Tester connection D41-1 (VC5) - D41-24 (AGND)
        Tool setting 2V/DIV., 200ms./DIV.
        Conditions IG is turned OFF, the key is brought outside the vehicle, and within 30 seconds after the engine switch is pushed.
        Fig 6: Waveform 3
        G12589404Courtesy of SUBARU OF AMERICA, INC.
      4. Waveform 4 (reference)
        PART DESCRIPTION - MEASURING CONDITIONS

        Item Contents
        Tester connection D48-13 (EFIO) - D48-11 (GND)
        Tool setting 5 V/DIV., 100 ms./DIV.
        Conditions Within 3 seconds after engine start, or within 3 seconds from engine switch ON (IG) after battery cable disconnection and reconnection
        Fig 7: Waveform 4
        G10216357Courtesy of SUBARU OF AMERICA, INC.
  3. Confirm the ID code box (immobilizer code ECM) (with ID code box).
    G12589406Courtesy of SUBARU OF AMERICA, INC.
    1. Disconnect the connector A30 of the ID code box (immobilizer code ECM).
    2. Measure the resistance and voltage based on the following table.
      Terminal No. (symbol) Input/output Terminal description Conditions Specified condition Related [Data monitor] item/DTC
      A30-1 (+B) - A30- 5 (GND) Input +B power supply Always 11 to 14V -
      A30-5 (GND) - Chassis ground - Ground Always 1Ω or less -

      If the specified result is not obtained, there may be the defect in the wire harness side.

    3. Reconnect the connector A30 of the ID code box (immobilizer code ECM).
    4. Refer to the table below and measure the voltage and check for a pulse.
      Terminal No. (symbol) Input/output Terminal description Conditions Specified condition Related [Data monitor] item/DTC
      A30-4 (IMO1) - A30-5 (GND) Input/output EFI communication signal (from ID code box (immobilizer code ECM) to ECM) IG OFF 11 to 14V  
      • B1571
      • B1572
      • Engine start request
      • EFI code reception
      EFI communication signal (from ID code box (immobilizer code ECM) to ECM) IG OFF → IG ON Pulse generation (Refer to waveform 1, see Fig 8)
    5. Inspect using an oscilloscope.
      CAUTION: The waveform shown in the figure is an example for reference. The noise and chattering are not shown in the figure.
      1. Waveform 1 (reference)
        PART DESCRIPTION - MEASURING CONDITIONS

        Item Contents
        Tester connection A30-4 (IMO1) - A30-5 (GND)
        Tool setting 5 V/DIV., 100 ms./DIV.
        Conditions IG OFF →IG ON
        Fig 8: Waveform 1
        G10216357Courtesy of SUBARU OF AMERICA, INC.
  4. Confirm the steering lock actuator ASSY (steering lock ECM).
    1. Refer to the table below and measure the resistance and the voltage and check for a pulse.
      G12589408Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. (symbol) Input/output Terminal description Conditions Specified condition Related [Data monitor] item/DTC
      D59-1 (GND) - Chassis ground - Ground Always 1Ω or less -
      D59-3 (SLR+) - Chassis ground Input Motor drive command signal sent from the steering lock motor drive command signal (collation ECM (smart key ECM ASSY) After establishing the necessary conditions, the steering lock motor operates when any one of the doors opens.
      • Shift lever positioned in P(1) or N(2)
      • The key is held in hand and engine switch is ON (IG), and steering lock is unlocked beforehand.
      • If the above conditions are met turn off the engine switch.
      		 Pulse generation (Refer to waveform 1, see Fig 9)  
      • Power supply short
      • Unlock request reception
      • Lock request reception
      D59-4 (SLR) - Chassis ground Output Steering lock bar position signal (output signal from steering unlock sensor) Steering lock →unlock (3) 11 to 14 V →1.2 V or less  
      • Push button start error
      • Sensor value
      D59-6 (IGN1) - Chassis ground Input Power supply mode signal (IG2 power supply input for all steering lock actuator ASSY) Engine switch OFF →ON (IG) 1V or less →11 to 14V  
      • B2788
      • IG
      D59-7 (B) - Chassis ground Input Power supply Always 11 to 14V B2788
      (1) With automatic transmission

      (2) With manual transmission
      NOTE:
      • (3) With shift lever positioned in P (for automatic transmission), if any one of the doors opens, the steering is locked and IG is turned OFF. With ACC ON, the steering is unlocked.
    2. Inspect using an oscilloscope.
      CAUTION: The waveform shown in the figure is an example for reference. The noise and chattering are not shown in the figure.
      1. Waveform 1 (reference)
        Fig 9: Waveform 1
        G12589409Courtesy of SUBARU OF AMERICA, INC.
        PART DESCRIPTION - MEASURING CONDITIONS

        Item Contents
        Tester connection D59-3 (SLR+) - D59-1 (GND)
        Tool setting 2V/DIV., 200ms./DIV.
        Conditions If both conditions are met, the steering motor operates and door opens:
        • Shift lever positioned in P*
        • The key is held in hand and engine switch is ON (IG), and steering lock is unlocked beforehand.
        • If the above conditions are met turn off the engine switch.

        *1: With automatic transmission

  5. CHECK ECM
    G12589410Courtesy of SUBARU OF AMERICA, INC.
    1. Refer to the table below and measure the resistance and the voltage and check for a pulse.
      Terminal No. (symbol) Input/output Terminal description Conditions Specified condition Related [Data monitor] item/DTC
      A36-4 (GNDEG1) - Chassis ground - Ground Always 1Ω or less -
      A33-2 (BATT) - A36-4 (GNDEG1) Input +B power supply Always 11 to 14 V -
      A33-1 (VBEC2) - A36-4 (GNDEG1) Input +B power supply IG ON 11 to 14 V -
      A34-6 (VBEC1) - A36-4 (GNDEG1) Input +B power supply IG ON 11 to 14 V -
      A35-25 (IMO1) - A36-4 (GNDEG1) Input ID code box (immo-bilizer code ECM) (1) or the collation ECM
      (smart key ECM ASSY) communication ID code box (immobilizer code ECM) communication input      		 IG OFF 11 to 14 V -
      IG ON Pulse generation (Refer to waveform 1, see Fig 10) -
      (1) With ID code box

      If you cannot get the specified result, there could be a problem in the ECM.

    2. Inspect using an oscilloscope.
      CAUTION: The waveform shown in the figure is an example for reference. The noise and chattering are not shown in the figure.
      1. Waveform 1 (reference)
        PART DESCRIPTION - MEASURING CONDITIONS

        Item Contents
        Tester connection A30-4 (IMO1) - A30-5 (GND)
        Tool setting 2V/DIV., 500ms./DIV.
        Conditions IG OFF →IG ON
        Fig 10: Waveform 1
        G12589411Courtesy of SUBARU OF AMERICA, INC.
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