LIGHTING SYSTEM TERMINALS OF ECU


  1. CHECK MAIN BODY ECU (NETWORK GATEWAY ECU)

    A004IJ6E02
    Text in Illustration
    *1 Instrument Panel Junction Block Assembly *2 Main Body ECU (Network Gateway ECU)

    1. Remove the main body ECU (network gateway ECU) from the instrument panel junction block assembly.

    2. Disconnect the A73 and D6 main body ECU (network gateway ECU) connectors.

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

      Terminal No. Wiring Color Terminal Description Condition Specified Condition
      A73-4(GND) - Body ground B-Y - Body ground Ground Always Below 1 Ω
      D6-1(GND) - Body ground B - Body ground Ground Always Below 1 Ω
      3C-4 - Body ground None - Body ground Ignition switch power supply Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      3C-7 - Body ground None - Body ground Battery power supply Always 11 to 14 V
      3E-1 - Body ground None - Body ground Battery power supply Always 11 to 14 V

      If the result is not as specified, there may be a malfunction in the wire harness.

    4. Reconnect the instrument panel junction block assembly and main body ECU (network gateway ECU) connectors.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      D6-13 (CLTE)* - Body ground G - Body ground Automatic light control sensor ground Always Below 1 Ω

      • *: w/ Automatic Light Control System

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      D5-26 (RFOG)*1 - Body ground Y - Body ground Rear fog light switch signal Rear fog light switch on Below 1 V
      Rear fog light switch off

      Pulse generation

      (See waveform 2 or 3)
      MB-21 (HU) - Body ground None - Body ground Dimmer switch high signal Dimmer switch in high position Below 1 V
      Dimmer switch in low position 11 to 14 V
      MB-18 (HF) - Body ground None - Body ground Dimmer switch high flash signal Dimmer switch in high flash position Below 1 V
      Dimmer switch not in high flash position

      Pulse generation

      (See waveform 2 or 3)
      D6-15 (CLTB)*2 - Body ground R - Body ground Automatic light control sensor power supply Ignition switch ON 11 to 14 V
      D6-14 (CLTS)*2 - Body ground LG - Body ground Automatic light control sensor signal Ignition switch off Below 1 V
      Automatic light control system operates

      Pulse generation

      (See waveform 1)
      D5-24 (FFOG)*3 - Body ground W - Body ground Front fog light switch signal Front fog light switch on Below 1 V
      Front fog light switch off 11 to 14 V
      D5-23 (A)*2 - Body ground SB - Body ground Light control switch AUTO signal Light control switch in AUTO position Below 1 V
      Light control switch not in AUTO position

      Pulse generation

      (See waveform 2 or 3)
      D5-2 (HEAD1) - Body ground W - Body ground Light control switch head signal Light control switch in head position Below 1 V
      Light control switch not in head position 11 to 14 V
      D5-25 (TAIL) - Body ground) BE - Body ground Light control switch tail signal Light control switch in tail or head position Below 1 V
      Light control switch in neither tail nor head position 11 to 14 V
      MB-30 (FFGO)*3 - Body ground None - Body ground Front fog relay drive output Light control switch in tail and front fog light switch on Below 1 V
      Light control switch in tail and front fog light switch off 11 to 14 V
      A73-2 (HRLY) - Body ground L - Body ground Headlight relay drive output Light control switch in head Below 1 V
      Light control switch not in head 11 to 14 V
      A73-11 (DIM) - Body ground G - Body ground Dimmer relay drive output Dimmer switch in high or high flash position Below 1 V
      Dimmer switch in low position 11 to 14 V

      • *1: w/ Rear Fog Light

      • *2: w/ Automatic Light Control System

      • *3: w/ Front Fog Light

      Tech Tips

      If the result is not as specified, the main body ECU (network gateway ECU) may have a malfunction.


      1. A004I58E01

        Waveform 1

        Item Content
        Terminal No. (Symbol) D6-14 (CLTS)*1 - Body ground
        Tool setting 5 V/DIV., 5 ms./DIV.
        Condition

        Ignition switch ON

        Light control switch AUTO

        Automatic light control sensor with a hand → Automatic light control sensor covered exposed to ambient light

        Tech Tips

        If the ambient light becomes brighter, width A becomes narrower.

      2. A004KGTE02

        Waveform 2

        Item Content
        Terminal No. (Symbol) D5-26 (RFOG)*2 - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition

        Ignition switch ON

        Rear fog light switch off
        Item Content
        Terminal No. (Symbol) MB-18 (HF) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition

        Ignition switch ON

        Dimmer switch not in high flash position
        Item Content
        Terminal No. (Symbol) D5-23 (A)*1 - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition

        Ignition switch ON

        Light control switch not in AUTO position
      3. A004I3ZE04

        Waveform 3

        Item Content
        Terminal No. (Symbol) D5-26 (RFOG)*2 - Body ground
        Tool setting 5 V/DIV., 60 ms./DIV.
        Condition

        Ignition switch ON

        Rear fog light switch off
        Item Content
        Terminal No. (Symbol) MB-18 (HF) - Body ground
        Tool setting 5 V/DIV., 60 ms./DIV.
        Condition

        Ignition switch ON

        Dimmer switch not in high flash position
        Item Content
        Terminal No. (Symbol) D5-23 (A)*1 - Body ground
        Tool setting 5 V/DIV., 60 ms./DIV.
        Condition

        Ignition switch ON

        Light control switch not in AUTO position

    • *1: w/ Automatic Light Control System

    • *2: w/ Rear Fog Light

  2. HEADLIGHT LEVELING ECU ASSEMBLY

    A004I77E02
    Text in Illustration
    *1 Headlight Leveling ECU Assembly - -

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

      Terminal No. Wiring Color Terminal Description Condition Specified Condition
      A16-13(R-DIAG) - Body ground V - Body ground Headlight drive output Always Below 1.5 V
      A16-15(L-DIAG) - Body ground V-W - Body ground Headlight drive output Always Below 1.5 V