LIGHTING SYSTEM TERMINALS OF ECU


  1. CHECK COWL SIDE JUNCTION BLOCK LH AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    A01WTE2E03
    Text in Illustration
    *1 Main Body ECU (Multiplex Network Body ECU) - -

    1. Disconnect the cowl side junction block LH 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
      2F-1 - Body ground W - Body ground Battery power supply Always 11 to 14 V
      2G-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 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
      2J-1 - 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 cowl side junction block LH 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
      2K-3 - Body ground G - Body ground Taillight drive output Light control switch in tail or head position 11 to 14 V
      Light control switch off Below 1 V
      2H-30 - Body ground B - 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
      2K-25 - Body ground* 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
      2H-31 - Body ground 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
      E118-1 (DIM) - Body ground B - 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
      E118-24 (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
      E118-10 (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
      E118-19 (CLTB) - E118-21 (CLTE) GR - W Automatic light control sensor power supply output Engine switch off Below 1 V
      Engine switch on (IG), light control switch in AUTO position 11 to 14 V
      E118-20 (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)
      E118-23 (RFOG) - Body ground* P - Body ground Fog light switch rear position input Fog light switch in rear position Below 1 V
      Fog light switch off Pulse generation
      E118-26 (FFOG) - Body ground W - Body ground Fog light switch front position input Fog light switch in front position Below 1 V
      Fog light switch off Pulse generation
      E118-8 (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
      E118-12 (HEAD) - Body ground R - 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
      E118-22 (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

      • *: w/ Rear Fog Light

      If the result is not as specified, the main body ECU (multiplex network body ECU) or cowl side junction block LH may be malfunctioning.


      1. A01WV7LE01

        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 ECU SUB-ASSEMBLY LH

    A01WVGCE03

    1. Disconnect the A64 headlight 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
      A64-4 (IG) - Body ground G - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A64-13 (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
      A64-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the A64 headlight ECU sub-assembly LH connector.

      Tech Tips


      • Since the A64 connector of the headlight ECU sub-assembly LH uses a waterproof connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.

      • Since the B connector of the headlight ECU sub-assembly LH is connected to the connector inside the headlight assembly, 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
      A64-9(CRSL) - Body ground P - Body ground Cornering light drive output Cornering light off 11 to 14 V
      Cornering light on Pulse generation
      A64-11 (TNS) - Body ground L - 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
      A64-20 (LINL) - Body ground LG - Body ground LIN communication Engine switch on (IG) Pulse generation
      B-1 - B-10*1 - Low beam headlights/high beam headlights switching signal output High beam headlights off Below 1 V
      High beam headlights on 11 to 14 V
      B-3 - B-4 - Low beam headlighs drive output Low beam headlights off Below 1 V
      Low beam headlights on 16.05 to 25.65 V
      B-6 - B-14 - Headlight fan power source Low beam headlights off Below 1 V
      Low beam headlights on 4.5 to 5.5 V
      B-7 - B-17 - Headlight leveling motor power source Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      B-8 - B-17 - Headlight leveling motor signal output Engine switch on (IG), when low beam headlights turn on, vehicle height not changed Below 1 V
      Engine switch on (IG), when low beam headlights turn on, vehicle height changed andmaintained for more than 3 seconds 1.0 to 14 V
      C-13 - Body ground - Headlight leveling motor signal output Engine switch off (IG), Below 1 V
      Engine switch on (IG), Pulse generation
      B-9 - B-13 - Left turn signal light signal output Engine switch on (IG), LH turn signal light off Below 1 V
      Engine switch on (IG), LH turn signal light blinkin 11 to 14 V ←→ Below 1 V
      B-11 - B-16 - Daytime running lights/clearance lighs duty control signal output Daytime running lights and clearance lights off Below 1 V
      Daytime running lights or clearance lights on Pulse generation
      B-15 - B-14 - Headlight fan duty control signal input Low beam headlights off Below 1 V
      Low beam headlights on Pulse generation
      B-11 - B-20 - Daytime running lights/clearance lighs power source Daytime running lights and clearance lights off Below 1 V
      Daytime running lights or clearance lights on 11 to 14 V
      C-7 - C-8 - high beam headlights drive output High beam headlights off Below 1 V
      High beam headlights on

      6 to 11.55 V*1

      16.05 to 25.65 V*2

      *1: w/ Adaptive High Beam System

      *2: w/o Adaptive High Beam System

  3. CHECK HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH

    A01WWRFE03

    1. Disconnect the A65 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
      A65-4 (IG) - Body ground G - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A65-13 (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
      A65-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the A65 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
      A65-9(CRSR) - Body ground P - Body ground Cornering light drive output Cornering light off 11 to 14 V
      Cornering light on Pulse generation
      A65-11 (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
      A65-20 (LINL) - Body ground LG - Body ground LIN communication Engine switch on (IG) Pulse generation
      B-1 - B-10*1 - Low beam headlights/high beam headlights switching signal output High beam headlights off Below 1 V
      High beam headlights on 11 to 14 V
      B-3 - B-4 - Low beam headlighs drive output Low beam headlights off Below 1 V
      Low beam headlights on 16.05 to 25.65 V
      B-6 - B-14 - Headlight fan power source Low beam headlights off Below 1 V
      Low beam headlights on 4.5 to 5.5 V
      B-7 - B-17 - Headlight leveling motor power source Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      B-8 - B-17 - Headlight leveling motor signal output Engine switch on (IG), when low beam headlights turn on, vehicle height not changed Below 1 V
      Engine switch on (IG), when low beam headlights turn on, vehicle height changed andmaintained for more than 3 seconds 1.0 to 14 V
      C-13 - Body ground - Headlight leveling motor signal output Engine switch off (IG), Below 1 V
      Engine switch on (IG), Pulse generation
      B-9 - B-13 - Left turn signal light signal output Engine switch on (IG), RH turn signal light off Below 1 V
      Engine switch on (IG), RH turn signal light blinkin 11 to 14 V ←→ Below 1 V
      B-11 - B-16 - Daytime running lights/clearance lighs duty control signal output Daytime running lights and clearance lights off Below 1 V
      Daytime running lights or clearance lights on Pulse generation
      B-15 - B-14 - Headlight fan duty control signal input Low beam headlights off Below 1 V
      Low beam headlights on Pulse generation
      B-11 - B-20 - Daytime running lights/clearance lighs power source Daytime running lights and clearance lights off Below 1 V
      Daytime running lights or clearance lights on 11 to 14 V
      C-7 - C-8 - high beam headlights drive output High beam headlights off Below 1 V
      High beam headlights on

      6 to 11.55 V*1

      16.05 to 25.65 V*2

      *1: w/ Adaptive High Beam System

      *2: w/o Adaptive High Beam System

  4. CHECK COMBINATION METER ASSEMBLY

    A01WWB3E03

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E121-9 (ER) - Body ground B - 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
      E121-10 (EL) - Body ground L - 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
      E121-11 (HZSW) - Body ground P - 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
      E121-5 (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 not pressed Below 1 V
      E121-4 (SW) - Body ground P - Body ground Turn signal switch (full turn position) signal input Engine switch on (IG), turn signal switch off 11 to 14 V
      Engine switch on (IG), turn signal switch in full turn position Below 1 V