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ECM Terminal Arrangement

WARNING: This page is about a different car, the 2014 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • Before measuring the resistance of CAN bus, turn the ignition OFF and leave the vehicle as is for at least one minute without operating keys, switches, and doors. Disconnect the auxiliary battery and wait for another one minute or more.
  • After IG OFF, you may need to wait for some time before disconnecting the auxiliary battery terminal. Before starting the troubleshooting, refer to the procedure for disconnecting the auxiliary battery terminals. (Refer to WORKING PRECAUTIONS AND NOTES )
NOTE: CAN communication system (ECM and sensor) may contain customized settings due to optional configuration. Before starting the procedure, make sure what type of systems (ECM and sensor) are implemented on the vehicle.
  1. Wiring harness connector (CAN J/C1)
    1. Wiring harness connector (CAN J/C1) (Instrument panel wire on right side of the vehicle) (VBUS)
      Fig 1: Identifying Wiring Harness Connector Terminal (CAN J/C1)
      G08552903Courtesy of SUBARU OF AMERICA, INC.
      ECM/sensor connection Terminal No. Wiring color
      Transmission control computer assembly A17-5 B-W
      A17-16 L
      Skid control ECM (Brake actuator assembly)
      [VBUS main line]      		 A17-6 BR
      A17-17 B-R
      CAN No. 2 junction connector
      [VBUS main line]      		 A17-7 W-B
      A17-18 R-Y
      Power steering computer assembly A17-8 B
      A17-19 W
  2. Wiring harness connector (CAN J/C2)
    1. Wiring harness connector (CAN J/C2) (Instrument panel wire on left side of the vehicle) (VBUS)
      Fig 2: Identifying Wiring Harness Connector Terminal (CAN J/C2)
      G08552904Courtesy of SUBARU OF AMERICA, INC.
      ECM/sensor connection Terminal No. Wiring color
      CAN No. 1 junction connector
      [VBUS main line]      		 D43-1 W-B
      D43-12 R-Y
      Combination meter assembly D43-2 BR
      D43-13 BR-W
      Main body ECM (Multiplex network body computer) D43-3 P
      D43-14 LG
      Collation ECM (Smart key computer assembly) D43-4 G
      D43-15 R
      Data link connector D43-5 B-Y
      D43-16 LG
      Spiral cable sub-assembly D43-6 G-W
      D43-17 G
      PSP (Accessory bus buffer) D43-7 P
      D43-18 L
      Airbag sensor assembly D43-8 P-L
      D43-19 R-W
      Engine control computer
      [VBUS main line]      		 D43-9 ◦
      D43-20 B-P
      Air conditioner amplifier assembly D43-10 L-W
      D43-21 L-Y
  3. Data link connector
    1. Inspection of data link connector (VBUS sub-line)
      1. Disconnect the battery ground terminal.
      2. Measure the resistance between the terminals.

      Resistance

      VBUS SUB-LINE

      Inspection terminals Inspection conditions Standard value
      D10-6↔D10-14 Disconnection of the battery ground terminal 57 to 63 Ω
      D10-6↔D10-4 Disconnection of the battery ground terminal 200 Ωor more
      D10-14↔D10-4 Disconnection of the battery ground terminal 200 Ωor more
      D10-6↔D10-16 Disconnection of the battery ground terminal 6 kΩ or more
      D10-14↔D10-16 Disconnection of the battery ground terminal 6 kΩ or more
      Fig 3: Identifying Data Link Connector Terminals
      G08552905Courtesy of SUBARU OF AMERICA, INC.
  4. Engine control computer
    1. Terminal arrangement
      Fig 4: Engine Control Computer Terminal Layout
      G08552906Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. terminal symbol
      A33-19 -
      A33-18 -
    2. Inspection of vehicle harness of engine control computer (VBUS main line)
      1. Disconnect the battery ground terminal, and then disconnect the vehicle harness connector A33 from the engine control computer.
      2. Measure the resistance between the terminals.

      Resistance

      Fig 5: Identifying Engine Control Computer Connector Terminals
      G08552907Courtesy of SUBARU OF AMERICA, INC.
      VBUS MAIN LINE

      Inspection terminals Inspection conditions Standard value
      A33-19↔A33-18 Disconnection of the battery ground terminal 114 to 126 Ω
      A33-19↔GND Disconnection of the battery ground terminal 200 Ωor more
      A33-18↔GND Disconnection of the battery ground terminal 200 Ωor more
      A33-19↔+B Disconnection of the battery ground terminal 6 kΩ or more
      A33-18↔+B Disconnection of the battery ground terminal 6 kΩ or more
  5. Transmission control computer assembly (Transmission A/T)
    1. Terminal arrangement
      Fig 6: Transmission Control Computer Assembly Terminal Layout (Transmission A/T)
      G08552908Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. terminal symbol
      A18-29 -
      A18-28 -
    2. Inspection of vehicle harness of transmission control computer assembly (VBUS sub-line)
      1. Disconnect the battery ground terminal, and then disconnect the vehicle harness connector A18 from the transmission control computer assembly.
      2. Measure the resistance between the terminals.

      Resistance

      Fig 7: Identifying Transmission Control Computer Assembly Connector Terminals
      G08552909Courtesy of SUBARU OF AMERICA, INC.
      VBUS SUB-LINE

      Inspection terminals Inspection conditions Standard value
      A18-29↔A18-28 Disconnection of the battery ground terminal 57 to 63 Ω
      A18-29↔GND Disconnection of the battery ground terminal 200 Ωor more
      A18-28↔GND Disconnection of the battery ground terminal 200 Ωor more
      A18-29↔+B Disconnection of the battery ground terminal 6 kΩ or more
      A18-28↔+B Disconnection of the battery ground terminal 6 kΩ or more
  6. Power steering computer assembly
    1. Terminal arrangement
      Fig 8: Power Steering Computer Assembly Terminal Layout
      G08552910Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. terminal symbol
      A15-1 -
      A15-7 -
    2. Inspection of vehicle harness of power steering computer assembly (VBUS sub-line)
      1. Disconnect the battery ground terminal, and then disconnect the vehicle harness connector A15 from the power steering computer assembly.
      2. Measure the resistance between the terminals.

      Resistance

      Fig 9: Identifying Power Steering Computer Assembly Connector Terminals
      G08552911Courtesy of SUBARU OF AMERICA, INC.
      VBUS SUB-LINE

      Inspection terminals Inspection conditions Standard value
      A15-1↔A15-7 Disconnection of the battery ground terminal 57 to 63 Ω
      A15-1↔GND Disconnection of the battery ground terminal 200 Ωor more
      A15-7↔GND Disconnection of the battery ground terminal 200 Ωor more
      A15-1↔+B Disconnection of the battery ground terminal 6 kΩ or more
      A15-7↔+B Disconnection of the battery ground terminal 6 kΩ or more
  7. Combination meter assembly
    1. Terminal arrangement
      Fig 10: Combination Meter Assembly Terminal Layout
      G08552912Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. terminal symbol
      D7-6 -
      D7-7 -
    2. Inspection of vehicle harness of combination meter assembly (VBUS sub-line)
      1. Disconnect the battery ground terminal, and then disconnect the vehicle harness connector D7 from the combination meter assembly.
      2. Measure the resistance between the terminals.

      Resistance

      Fig 11: Identifying Combination Meter Assembly Connector Terminals
      G08552913Courtesy of SUBARU OF AMERICA, INC.
      VBUS SUB-LINE

      Inspection terminals Inspection conditions Standard value
      D7-6↔D7-7 Disconnection of the battery ground terminal 57 to 63 Ω
      D7-6↔GND Disconnection of the battery ground terminal 200 Ωor more
      D7-7↔GND Disconnection of the battery ground terminal 200 Ωor more
      D7-6↔+B Disconnection of the battery ground terminal 6 kΩ or more
      D7-7↔+B Disconnection of the battery ground terminal 6 kΩ or more
  8. Main body ECM (Multiplex network body computer)
    1. Terminal arrangement
      Fig 12: Main Body ECM (Multiplex Network Body Computer) Terminal Layout
      G08552914Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. terminal symbol
      D5-14 -
      D5-13 -
    2. Inspection of vehicle harness of main body ECM (Multiplex network body computer) (VBUS sub-line)
      1. Disconnect the battery ground terminal, and then disconnect the vehicle harness connector D5 from the main body ECM (Multiplex network body computer).
      2. Measure the resistance between the terminals.

      Resistance

      VBUS SUB-LINE

      Inspection terminals Inspection conditions Standard value
      D5-14↔D5-13 Disconnection of the battery ground terminal 57 to 63 Ω
      D5-14↔GND Disconnection of the battery ground terminal 200 Ωor more
      D5-13↔GND Disconnection of the battery ground terminal 200 Ωor more
      D5-14↔+B Disconnection of the battery ground terminal 6 kΩ or more
      D5-13↔+B Disconnection of the battery ground terminal 6 kΩ or more
      Fig 13: Identifying Main Body ECM (Multiplex Network Body Computer) Connector Terminal
      G08552915Courtesy of SUBARU OF AMERICA, INC.
  9. Collation ECM (Smart key computer assembly) (with smart entry)
    1. Terminal arrangement
      Fig 14: ECM Terminal Layout (With Smart Entry)
      G08552916Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. terminal symbol
      D41-14 -
      D41-15 -
    2. Inspection of vehicle harness of collation ECM (Smart key computer assembly) (VBUS sub-line)
      1. Disconnect the battery ground terminal, and then disconnect the vehicle harness connector D41 from the collation ECM (Smart key computer assembly).
      2. Measure the resistance between the terminals.

      Resistance

      VBUS SUB-LINE

      Inspection terminals Inspection conditions Standard value
      D41-14↔D41-15 Disconnection of the battery ground terminal 57 to 63 Ω
      D41-14↔GND Disconnection of the battery ground terminal 200 Ωor more
      D41-15↔GND Disconnection of the battery ground terminal 200 Ωor more
      D41-14↔+B Disconnection of the battery ground terminal 6 kΩ or more
      D41-15↔+B Disconnection of the battery ground terminal 6 kΩ or more
      Fig 15: Identifying Collation ECM (Smart Key Computer Assembly) Connector Terminals
      G08552917Courtesy of SUBARU OF AMERICA, INC.
  10. Spiral cable sub-assembly (with sensor)
    1. Terminal arrangement
      Fig 16: Spiral Cable Sub-Assembly Terminal Layout (With Sensor)
      G08552918Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. terminal symbol
      D56-3 -
      D56-2 -
    2. Inspection of vehicle harness of spiral cable sub-assembly (with sensor) (VBUS sub-line)
      1. Disconnect the battery ground terminal, and then disconnect the vehicle harness connector D56 from the spiral cable sub-assembly (with sensor).
      2. Measure the resistance between the terminals.

      Resistance

      Fig 17: Identifying Spiral Cable Sub-Assembly Connector Terminals (With Sensor)
      G08552919Courtesy of SUBARU OF AMERICA, INC.
      VBUS SUB-LINE

      Inspection terminals Inspection conditions Standard value
      D56-3↔D56-2 Disconnection of the battery ground terminal 57 to 63 Ω
      D56-3↔GND Disconnection of the battery ground terminal 200 Ωor more
      D56-2↔GND Disconnection of the battery ground terminal 200 Ωor more
      D56-3↔+B Disconnection of the battery ground terminal 6 kΩ or more
      D56-2↔+B Disconnection of the battery ground terminal 6 kΩ or more
  11. PSP (Accessory bus buffer)
    1. Inspection of PSP (Accessory bus buffer) (VBUS sub-line)
      1. Disconnect the battery ground terminal.
      2. Measure the resistance between the terminals.

      Resistance

      VBUS SUB-LINE

      Inspection terminals Inspection conditions Standard value
      D29-4↔D29-5 Disconnection of the battery ground terminal 57 to 63 Ω
      D29-4↔GND Disconnection of the battery ground terminal 200 Ωor more
      D29-5↔GND Disconnection of the battery ground terminal 200 Ωor more
      D29-4↔+B Disconnection of the battery ground terminal 6 kΩ or more
      D29-5↔+B Disconnection of the battery ground terminal 6 kΩ or more
      Fig 18: Identifying PSP (Accessory Bus Buffer) Connector Terminals
      G08552920Courtesy of SUBARU OF AMERICA, INC.
  12. Airbag sensor assembly
    1. Terminal arrangement
      Fig 19: Airbag Sensor Assembly Terminal Layout
      G08552921Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. terminal symbol
      D27-13 -
      D27-22 -
    2. Inspection of vehicle harness of airbag sensor assembly (VBUS sub-line)
      1. Disconnect the battery ground terminal, and then disconnect the vehicle harness connector D27 from the airbag sensor assembly.
      2. Measure the resistance between the terminals.

      Resistance

      VBUS SUB-LINE

      Inspection terminals Inspection conditions Standard value
      D27-13↔D27-22 Disconnection of the battery ground terminal 57 to 63 Ω
      D27-13↔GND Disconnection of the battery ground terminal 200 Ωor more
      D27-22↔GND Disconnection of the battery ground terminal 200 Ωor more
      D27-13↔+B Disconnection of the battery ground terminal 6 kΩ or more
      D27-22↔+B Disconnection of the battery ground terminal 6 kΩ or more
      Fig 20: Identifying Airbag Sensor Assembly Connector Terminals
      G08552922Courtesy of SUBARU OF AMERICA, INC.
  13. Air conditioner amplifier assembly (Automatic air conditioning system)
    1. Terminal arrangement
      Fig 21: Air Conditioner Amplifier Assembly Terminal Layout (Automatic Air Conditioning System)
      G08552923Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. terminal symbol
      D19-13 -
      D19-12 -
    2. Inspection of vehicle harness of air conditioner amplifier assembly (VBUS sub-line)
      1. Disconnect the battery ground terminal, and then disconnect the vehicle harness connector D19 from the air conditioner amplifier assembly.
      2. Measure the resistance between the terminals.

      Resistance

      Fig 22: Identifying Air Conditioner Amplifier Assembly Connector Terminals
      G08552924Courtesy of SUBARU OF AMERICA, INC.
      VBUS SUB-LINE

      Inspection terminals Inspection conditions Standard value
      D19-13↔D19-12 Disconnection of the battery ground terminal 57 to 63 Ω
      D19-13↔GND Disconnection of the battery ground terminal 200 Ωor more
      D19-12↔GND Disconnection of the battery ground terminal 200 Ωor more
      D19-13↔+B Disconnection of the battery ground terminal 6 kΩ or more
      D19-12↔+B Disconnection of the battery ground terminal 6 kΩ or more
  14. Brake actuator assembly
    1. Terminal arrangement
      Fig 23: Brake Actuator Assembly Terminal Layout
      G08552925Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. terminal symbol
      A5-26 -
      A5-14 -
    2. Inspection of vehicle harness of brake actuator assembly (VBUS main line)
      1. Disconnect the battery ground terminal, and then disconnect the vehicle harness connector A5 from the brake actuator assembly.
      2. Measure the resistance between the terminals.

      Resistance

      VBUS MAIN LINE

      Inspection terminals Inspection conditions Standard value
      A5-26↔A5-14 Disconnection of the battery ground terminal 114 to 126 Ω
      A5-26↔GND Disconnection of the battery ground terminal 200 Ωor more
      A5-14↔GND Disconnection of the battery ground terminal 200 Ωor more
      A5-26↔+B Disconnection of the battery ground terminal 6 kΩ or more
      A5-14↔+B Disconnection of the battery ground terminal 6 kΩ or more
      Fig 24: Identifying Brake Actuator Assembly Connector Terminals
      G08552926Courtesy of SUBARU OF AMERICA, INC.
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