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ECM Terminal Arrangement

  1. Main body ECM (multiplex network body computer)
    Fig 1: ECM Connector Terminal Arrangement
    G08557580Courtesy of SUBARU OF AMERICA, INC.
    1. Inspection of the main body ECM (multiplex network body computer) and the instrument panel junction block assembly
      1. Disconnect the connector of the main body ECM (multiplex network body computer).
      2. Measure the voltage between the connector terminals on the vehicle wiring harness side.
        STANDARD VALUE

        Terminal No. (Terminal symbol) Inspection conditions Standard value
        D5-22 (ACC) ↔chassis ground (1) ACC ON 11 to 14 V
        (1) When there is a smart entry & start system
        NOTE: If it is out of the standard value, it can be judged as malfunction of the vehicle.
      3. Disconnect the connector of the instrument panel junction block assembly.
      4. Measure the voltage and resistance between the connector terminals on the vehicle wiring harness side.
        STANDARD VALUE

        Terminal No. (Terminal symbol) Inspection conditions Standard value
        3A-12 ↔chassis ground Always Less than 1 Ω
        3A-13 ↔chassis ground Always Less than 1 Ω
        3A-15 ↔chassis ground IG ON 11 to 14 V
        3A-20 ↔chassis ground ACC ON 11 to 14 V
        3A-27 ↔chassis ground Always 11 to 14 V
        3C-19 ↔chassis ground Always 11 to 14 V
        3E-1 ↔chassis ground Always 11 to 14 V
        A73-4 (GND) ↔chassis ground Always Less than 1 Ω
        D6-1 (GND) ↔chassis ground Always Less than 1 Ω
        NOTE: If it is out of the standard value, it can be judged as malfunction of the vehicle.
      5. Connect the connectors of the main body ECM (multiplex network body computer) and the instrument panel junction block assembly.
      6. Measure the voltage or waveform between the connector terminals.
      STANDARD VALUE

      Terminal No. (Terminal symbol) Inspection conditions Standard value
      3B-13 ↔chassis ground With driver's door closed →opened 11 to 14V →Less than 1V
      3A-28 ↔chassis ground With passenger's door closed →opened 11 to 14V →Less than 1V
      3D-26 ↔chassis ground With trunk closed →opened 11 to 14V →Less than 1V
      D5-5 (FRCL) ↔chassis ground Driver's side courtesy light ON →OFF 11 to 14V →Less than 1V
      D5-6 (FLCL) ↔chassis ground Passenger's side courtesy light ON →OFF 11 to 14V →Less than 1V
      D5-7 (DOMR) ↔chassis ground Map light assembly OFF →ON Less than 1 V →11 to 14 V
      D5-28 (ILL) ↔chassis ground (2) Transponder key amplifier (key cylinder light) ON →OFF Less than 1 V →11 to 14 V
      D6-11 (LSFD) ↔chassis ground (1) Driver's side door locked →unlocked Pulse generation →less than 1 V
      D6-12 (LSFP) ↔chassis ground (1) Passenger's side door locked →unlocked Pulse generation →less than 1 V
      (1) When there is a smart entry & start system
      (2) When there is no smart entry & start system
      NOTE: If the measured value is not within the range of the standard value, it can be determined that the main body ECM (multiplex network body computer) has a fault.
  2. Smart key computer assembly (collation ECM)
    Fig 2: Identifying Smart Key Computer Assembly Connector
    G08557581Courtesy of SUBARU OF AMERICA, INC.
    1. Inspection of the smart key computer assembly (collation ECM)
      1. Disconnect the connector D48 of the smart key computer assembly (collation ECM).
      2. Measure the voltage and resistance between the connector terminals of the smart key computer assembly (collation ECM) on the vehicle side.
        STANDARD VALUE

        Terminal No. (Terminal symbol) Input/Output Item Inspection conditions Standard value
        D41-5 (IG2) ↔chassis ground Input Voltage IG ON 11 to 14 V
        D48-2 (+B) ↔D48-11 Input Voltage Always 11 to 14 V
        D48-11 (GND) ↔chassis ground - Resistance Always Less than 1 Ω
        NOTE: If it is out of the standard value, it can be judged as malfunction of the vehicle.
      3. Connect the connector D48 of the smart key computer assembly (collation ECM).
      4. Measure the voltage between the connector terminals.
      STANDARD VALUE

      Terminal No. (Terminal symbol) Input/Output Item Inspection conditions Standard value
      D41-16 (SWIL) ↔D41-24 (AGND) Output Voltage Push button start switch ON →OFF 11 to 14V →Less than 1V
      NOTE: If the measured value is not within the range of the standard value, it can be determined that the smart key computer assembly (collation ECM) has a fault.
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