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ECM terminal arrangement

  1. Main body ECM (network gateway computer), instrument panel junction block ASSY
    Fig 1: Identifying Main Body ECM (Network Gateway Computer) And Instrument Panel Junction Block ASSY Connectors Terminals
    G08557964Courtesy of SUBARU OF AMERICA, INC.
    1. Inspection of the instrument panel junction block ASSY and the main body ECM (network gateway computer)
      1. Remove the main body ECM (network gateway computer) from the instrument panel junction block ASSY.
      2. Measure the voltage and resistance between terminals.
        STANDARD VALUE

        Terminal No. (Terminal symbol) Inspection conditions Standard value
        A73-2 (HRLY) ↔chassis ground Always 11 to 14 V
        A73-3 (RFGO) ↔chassis ground Always 11 to 14 V
        A73-4 (GND) ↔chassis ground Always Less than 1 Ω
        A73-23 ↔chassis ground Always 11 to 14 V
        MB-30 (FFGO) ↔chassis ground When the tail lights are on 11 to 14 V
        D6-1 (GND) ↔chassis ground Always Less than 1 Ω
        3C-4 ↔chassis ground IG ON 11 to 14 V
        3C-7 ↔chassis ground Always 11 to 14 V
        3E-1 ↔chassis ground Always 11 to 14 V
        NOTE: If it is outside the standard values, the vehicle is defective.
      3. Install the main body ECM (network gateway computer) on the instrument panel junction block ASSY.
      4. Measure the resistance between the terminals.
        STANDARD VALUE

        Terminal No. Inspection conditions Standard value
        D6-13 (CLTE)(1) ↔chassis ground Always Less than 1 Ω
        (1) When there is auto light control
      5. Measure the voltage between the terminals.
        STANDARD VALUE

        Terminal No. (Terminal symbol) Inspection conditions Standard value
        A73-11 (DIM) ↔chassis ground When in key SW OFF, IG OFF, or ACC OFF, light control switch OFF →HEAD Less than 1 V →11 to 14 V
        A73-12 ↔chassis ground IG ON, light control switch OFF →HEAD 11 to 14 V →Less than 1 V
        D5-2 (HEAD) ↔chassis ground Key SW ON, light control switch OFF →HEAD(1) 11 to 14 V →Less than 1 V
        ACC ON, light control switch OFF →HEAD(2)
        D5-23 (A)(3) ↔chassis ground Light control switch OFF →AUTO 11 to 14 V →Less than 1 V
        D5-24 (FFOG) ↔chassis ground Front fog light switch OFF →ON 11 to 14 V →Less than 1 V
        D5-25 (TAIL) ↔chassis ground Light control switch OFF →TAIL 11 to 14 V →Less than 1 V
        D5-26 (RFOG) ↔chassis ground Rear fog light switch OFF →ON 11 to 14 V →Less than 1 V
        D6-14 (CLTS)(3) ↔chassis ground IG ON, light control switch is AUTO, automatic control sensor is covered by something that doesn't let light through →exposed Pulse generation (changes according to the light) (waveform 1)
        D6-15 (CLTB)(3) ↔chassis ground IG ON 11 to 14 V
        MB-18 (HF) ↔chassis ground Headlight dimmer switch (flashing) OFF→ON 11 to 14 V →Less than 1 V
        MB-21 (HU) ↔chassis ground When the light control switch is set to HEAD, LO beam →HI beam 11 to 14 V →Less than 1 V
        (1) When there is no smart entry & start system
        (2) When there is a smart entry & start system
        (3) When there is auto light control
    2. Waveform 1
      Item Contents
      Inspection terminals D6-14 ↔chassis ground
      Equipment setting 5V/DIV, 5ms/DIV
      Inspection conditions IG ON, light control switch is AUTO, automatic control sensor is covered by something that doesn't let light through →exposed
      *: When there is auto light control
      NOTE: The brighter the area becomes, the shorter the A interval becomes.
      Fig 2: Auto Light Control Signal Waveform 1
      G08557965Courtesy of SUBARU OF AMERICA, INC.
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