LIGHTING SYSTEM(for Triple Beam Headlight) TERMINALS OF ECU


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

    B0077UOC40
    *1 Main Body ECU (Multiplex Network Body ECU) - -

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

    2. Measure the voltage on the wire harness side connector according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      4F-1 - Body ground B - Body ground Battery power supply Always 11 to 14 V
      4E-1 - Body ground B - 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 on the wire harness side connector according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      4B-7 - 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
      4C-5 - Body ground B - Body ground Parking light drive output Light control switch in tail or head position 11 to 14 V
      Light control switch off Below 1 V
      4D-28 - Body ground V - Body ground Taillight drive output Light control switch in tail or head position 11 to 14 V
      Light control switch off Below 1 V
      4C-29 - Body ground R - Body ground H-LP LH relay drive output Light control switch in tail or head position Below 1 V
      Light control switch off 11 to 14 V
      4D-12 - Body ground*2 BE - 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
      4C-27 - Body ground*1 L - Body ground Front fog light 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
      O2-1 (DIM) - Body ground V - Body ground H-LP RH relay drive output Light control switch in tail or head position Below 1 V
      Light control switch off 11 to 14 V
      4C-15 - Body ground GR - Body ground Parking brake switch input Parking brake switch on Below 1 V
      Parking brake switch off 11 to 14 V
      O2-24 (HU) - Body ground V - Body ground Dimmer switch high position signal input Dimmer switch in high position Below 1 V
      Dimmer switch not in high position Pulse generation
      O2-10 (HF) - Body ground L - 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
      O2-19 (CLTB) - O2-21 (CLTE) GR - W Automatic light control sensor power supply output Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      O2-20 (CLTS) - Body ground R - Body ground Automatic light control sensor signal input Engine switch off Below 1 V
      Automatic light control system operating

      Communication waveform generation

      (See waveform 1)
      O2-23 (RFOG) - Body ground*2 P - Body ground Fog light switch rear position input Fog light switch in rear position Below 1 V
      Fog light switch off Pulse generation
      O2-26 (FFOG) - Body ground*1 W - Body ground Fog light switch front position input Fog light switch in front position Below 1 V
      Fog light switch off Pulse generation
      O2-8 (A) - Body ground P - 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
      O2-12 (HEAD) - Body ground Y - Body ground Light control switch head position input Light control switch in head position Below 1 V
      Light control switch not in head position Pulse generation
      O2-22 (TAIL) - Body ground B - 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 Pulse generation
      O1-4 (MILE) - Body ground LG - Body ground Outside handle foot lights drive output Outside handle foot light illuminates 11 to 14 V
      Outside handle foot light off Below 3 V

      • *1: w/ Front Fog Light

      • *2: w/ Rear Fog 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. B0075NDN01

        Waveform 1

        Item Content
        Tool setting 2 V/DIV., 10 ms./DIV.

        Tech Tips

        The communication waveform changes according to the surrounding brightness.

  2. CHECK HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH

    B0075BIN05

    1. Disconnect the A36 headlight light control ECU sub-assembly LH connector.

    2. Measure the resistance and voltage on the wire harness side connector according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A36-4 (IG) - Body ground B - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A36-13 (ECUB) - Body ground W - Body ground Battery power supply Light control switch off Below 1 V
      Light control switch in tail or head position 11 to 14 V
      A36-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the A36 headlight light control ECU sub-assembly LH connector.

      Tech Tips

      Since the headlight light control ECU sub-assembly LH uses a waterproof connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A36-8 (RLD2) - Body ground G - Body ground Daytime running light/clearance light drive output Daytime running light or clearance light on Below 1 V
      Daytime running light and clearance light off Pulse generation
      A36-11 (TNS) - Body ground G - Body ground LH turn signal light signal input Engine switch on (IG), LH turn signal light off Below 1 V
      Engine switch on (IG), LH turn signal light blinking 11 to 14 V ←→ Below 1 V
      A36-16 (SBR) - A36-15 (SGR) GR - LG Rear height control sensor power supply Engine switch on (IG) 4.75 to 5.25 V
      A36-17 (SHRL) - A36-15 (SGR) G - LG Rear height control sensor signal input Engine switch on (IG), vehicle unloaded, vehicle stopped

      Approximately 2.5 V

      (value decreases as the front of the vehicle is raised)
      A36-20 (LINL) - Body ground LG - Body ground LIN communication Engine switch on (IG) Pulse generation

  3. CHECK HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH

    B0075BIN06

    1. Disconnect the A7 headlight light control ECU sub-assembly RH connector.

    2. Measure the resistance and voltage on the wire harness side connector according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A7-4 (IG) - Body ground B - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A7-13 (ECUB) - Body ground G - Body ground Battery power supply Light control switch off Below 1 V
      Light control switch in tail or head position 11 to 14 V
      A7-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the A7 headlight light control ECU sub-assembly RH connector.

      Tech Tips

      Since the headlight light control ECU sub-assembly RH uses a waterproof connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A7-8 (RLD2) - Body ground G - Body ground Daytime running light/clearance light drive output Daytime running light or clearance light on Below 1 V
      Daytime running light and clearance light off Pulse generation
      A7-11 (TNS) - Body ground R - Body ground RH turn signal light signal input Engine switch on (IG), RH turn signal light off Below 1 V
      Engine switch on (IG), RH turn signal light blinking 11 to 14 V ←→ Below 1 V
      A7-20 (LINL) - Body ground LG - Body ground LIN communication Engine switch on (IG) Pulse generation

  4. CHECK COMBINATION METER ASSEMBLY

    B0075AIN12

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      O4-4 (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
      O4-5 (EL) - Body ground GR - 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
      O4-11 (HZSW) - Body ground W - Body ground Hazard warning signal switch signal (Input) Engine switch on (IG), hazard warning signal switch not pressed 11 to 14 V
      Engine switch on (IG), hazard warning signal switch pressed Below 1 V
      O4-12 (HAZM) - Body ground B - Body ground Hazard warning signal switch signal (Output) Engine switch on (IG), hazard warning signal switch not pressed 11 to 14 V
      Engine switch on (IG), hazard warning signal switch pressed Below 1 V