LIGHTING SYSTEM TERMINALS OF ECU


  1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU

    A00483FC08
    *A for LHD *B for RHD
    *1 Instrument Panel Junction Block Assembly *2 Main Body ECU

    1. Remove the main body ECU.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      MB-11 (GND1) - Body ground - Ground Always Below 1 Ω
      MB-29 (ACC) - Body ground - Ignition power supply (ACC signal) Ignition switch ACC 11 to 14 V
      MB-30 (BECU) - Body ground - Battery power supply Always 11 to 14 V
      MB-32 (IG)- Body ground - Ignition power supply (IG signal) Ignition switch ON 11 to 14 V

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

    3. Reinstall the main body ECU.

    4. Measure the voltage, resistance and check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F76-1 (RFOG) - Body ground LG - Body ground Rear fog light switch signal Rear fog light switch on Below 1 V
      Rear fog light switch off Pulse generation
      F76-5 (HU) - Body ground P - Body ground Dimmer switch high signal Dimmer switch in high position Below 1 V
      Dimmer switch in low position Pulse generation
      F76-8 (HF) - Body ground P - 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
      F76-15 (DRLE) - Body ground L - Body ground Daytime running light drive output Daytime running lights on Below 1 V
      Daytime running lights off 11 to 14 V
      F76-20 (CLTB) - Body ground*1 W - Body ground Automatic light control sensor power supply Ignition switch ON 11 to 14 V
      F76-21 (CLTS) - Body ground*1 B - Body ground Automatic light control sensor signal Ignition switch off Below 1 V
      Ignition switch ON and light control switch in AUTO

      Pulse generation

      (See waveform 1)
      F76-22 (CLTE) - Body ground*1 G - Body ground Automatic light control sensor ground Ignition switch off Below 1 Ω
      F76-27 (FFOG) - Body ground*2 G - Body ground Front fog light switch signal Front fog light switch on Below 1 V
      Front fog light switch off Pulse generation
      F76-28 (A) - Body ground*1 V - 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
      F76-29 (HEAD) - Body ground L - Body ground Light control switch head signal Light control switch in head position Below 1 V
      Light control switch not in head position Pulse generation
      F76-30 (TAIL) - Body ground SB - 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 Pulse generation
      3A-15 (FFGO) - Body ground*2 P - Body ground Front fog relay drive output Light control switch in head Below 1 V
      Light control switch not in head 11 to 14 V
      3C-18 (HRLY) - Body ground V - Body ground Headlight relay drive output Light control switch in head Below 1 V
      Light control switch not in head 11 to 14 V
      3C-35 (DIM) - Body ground P - 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/ Automatic Light Control System

      • *2: w/ Front Fog Light

      Tech Tips

      If the result is not as specified, the main body ECU or instrument panel junction block assembly may have a malfunction.


      1. A0047MSE06

        Waveform 1

        Item Content
        Terminal No. (Symbol) F76-21 (CLTS) - Body ground
        Tool setting 5 V/DIV., 5 ms./DIV.
        Condition Ignition switch ON and light control switch in AUTO

        Tech Tips

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

  2. CHECK COMBINATION METER ASSEMBLY

    A0047UIE01

    1. Disconnect the F3 combination meter assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F3-1 (B) - Body ground R - Body ground Battery power supply Always 11 to 14 V

      Tech Tips

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

    3. Reconnect the combination meter assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F3-3 (HAZ) - Body ground L - Body ground Hazard warning signal switch signal Hazard warning signal switch off 11 to 14 V
      Hazard warning signal switch on Below 1 V
      F3-7 (LR) - Body ground V - Body ground Turn signal light RH drive output Turn signal light RH turned on 11 to 14 V
      Turn signal light RH turned off Below 1 V
      F3-9 (ER) - Body ground B - Body ground Turn signal switch RH signal Turn signal switch RH on Below 1 V
      Turn signal switch RH off 11 to 14 V
      F3-10 (EL) - Body ground Y - Body ground Turn signal switch LH signal Turn signal switch LH on Below 1 V
      Turn signal switch LH off 11 to 14 V
      F3-13 (LL) - Body ground LG - Body ground Turn signal light LH drive output Turn signal light LH turned on 11 to 14 V
      Turn signal light LH turned off Below 1 V

      Tech Tips

      If the result is not as specified, the combination meter assembly may have a malfunction.