LIGHTING SYSTEM TERMINALS OF ECU


  1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    A01M175C11
    *A Main Body ECU (Multiplex Network Body ECU) with 1 Connector - -
    *1 Main Body ECU (Multiplex Network Body ECU) - -
    *a 1 Connector - -
    A01LZ3CC10
    *A Main Body ECU (Multiplex Network Body ECU) with 2 Connectors - -
    *1 Main Body ECU (Multiplex Network Body ECU) - -
    *a 2 Connectors - -

    1. Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      3A-43 (BECU) - Body ground G - Body ground Battery power supply Always 11 to 14 V
      3B-1 - Body ground W - 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.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      3D-12 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω

      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 (multiplex network body ECU) connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      3A-7 - Body ground G - Body ground Clearance light RH drive output Light control switch in tail or head position 11 to 14 V
      Light control switch off Below 1 V
      3A-8 - Body ground G - Body ground Clearance light LH drive output Light control switch in tail or head position 11 to 14 V
      Light control switch off Below 1 V
      3E-17 - Body ground G - Body ground Taillight RH drive output Light control switch in tail or head position 11 to 14 V
      Light control switch off Below 1 V
      3E-32 - Body ground G - Body ground Taillight LH drive output Light control switch in tail or head position 11 to 14 V
      Light control switch off Below 1 V
      3A-35 (HRLY) - Body ground

      B - Body ground*1

      V - Body ground*2

      		 Headlight relay drive output Light control switch in head position Below 1 V
      Light control switch not in head position 11 to 14 V
      3A-53 (DRL) - Body ground*6 P - Body ground Daytime running light system drive output Daytime running light system operating Below 1 V
      Daytime running light system not operating 11 to 14 V
      3E-40 - Body ground*5 SB - Body ground Rear fog light drive output Light control switch in tail or head position, fog light switch in rear position 11 to 14 V
      Light control switch in tail or head position, fog light switch off Below 1 V
      3D-10 - Body ground*3 G - Body ground Front fog light drive output Always 11 to 14 V
      3C-43 (FFGO) - Body ground*3 L - Body ground Front fog light relay drive output Light control switch in tail or head position, fog light switch in front position Below 1 V
      Light control switch in tail or head position, fog light switch off 11 to 14 V
      3A-54 (DIM) - Body ground LG - Body ground High beam headlight drive output Dimmer switch in high or high flash position Below 1 V
      Dimmer switch in low position 11 to 14 V
      3D-47 - Body ground*3 L - Body ground Front fog relay power supply output Light control switch in tail or head position 11 to 14 V
      Light control switch off Below 1 V
      3E-27 - Body ground B - Body ground Parking brake switch input Parking brake switch on Below 1 V
      Parking brake switch off 11 to 14 V
      E22-5 (HU) - Body ground P - Body ground Dimmer switch high position signal input Dimmer switch in high position Below 1 V
      Dimmer switch not in high position Pulse generation
      E22-8 (HF) - Body ground R - Body ground Dimmer switch high flash position signal input Dimmer switch in high flash position Below 1 V
      Dimmer switch not in high flash position Pulse generation
      E22-20 (CLTB) - E22-22 (CLTE)*4 W - V Automatic light control sensor power supply output Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      E22-21 (CLTS) - Body ground*4 Y - Body ground Automatic light control sensor signal input Ignition switch off Below 1 V
      Automatic light control system operating

      Pulse generation

      (See waveform 1)
      E22-1 (RFOG) - Body ground*5 SB - Body ground Fog light switch rear position input Fog light switch in rear position Below 1 V
      Fog light switch off Pulse generation
      E22-27 (FFOG) - Body ground*3 G - Body ground Fog light switch front position input Fog light switch in front position Below 1 V
      Fog light switch off Pulse generation
      E22-28 (A) - Body ground*4 V - Body ground Light control switch AUTO position signal input Light control switch in AUTO position Below 1 V
      Light control switch not in AUTO position Pulse generation
      E22-29 (HEAD) - Body ground L - Body ground Light control switch head position input Light control switch in head position Below 1 V
      Light control switch not in head position, ignition switch off Pulse generation
      E22-30 (TAIL) - Body ground W - Body ground Light control switch tail position signal input Light control switch in tail or head position Below 1 V
      Light control switch not in tail or head position, ignition switch off Pulse generation

      • *1: w/ Headlight Cleaner

      • *2: w/o Headlight Cleaner

      • *3: w/ Front Fog Light

      • *4: w/ Automatic Light Control

      • *5: w/ Rear Fog Light

      • *6: w/ Daytime Running Light

      If the result is not as specified, the main body ECU (multiplex network body ECU) or instrument panel junction block assembly may be malfunctioning.


      1. A01M082N01

        Waveform 1

        Item Content
        Tool setting 5 V/DIV., 5 ms./DIV.

        Tech Tips

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

  2. CHECK COMBINATION METER ASSEMBLY

    A01LZ42N05

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E45-3 (HAZ) - Body ground GR - Body ground Hazard warning signal switch input Ignition switch ON, hazard warning switch off 11 to 14 V
      Ignition switch ON, hazard warning switch on Below 1 V
      E45-9 (ER) - Body ground P - Body ground Turn signal switch right signal input Turn signal switch in neutral position 11 to 14 V
      Turn signal switch in right turn position Below 1 V
      E45-10 (EL) - Body ground LG - Body ground Turn signal switch left signal input Turn signal switch in neutral position 11 to 14 V
      Turn signal switch in left turn position Below 1 V

  3. CHECK HEADLIGHT SWIVEL ECU ASSEMBLY

    A01M2QUN03

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A93-6 (INL) - Body ground P - Body ground LED headlight LH operation signal input Ignition switch ON, light control switch off 4.5 to 5.5 V
      Ignition switch ON, light control switch in head position Pulse generation
      A93-7 (INR) - Body ground G - Body ground LED headlight RH operation signal input Ignition switch ON, light control switch off 4.5 to 5.5 V
      Ignition switch ON, light control switch in head position Pulse generation

      • If the result is not as specified, the headlight swivel ECU assembly may be malfunctioning.