LIGHTING SYSTEM TERMINALS OF ECU


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

    A01VAOXN02
    A01V8PBC04
    *A Main Body ECU (Multiplex Network Body ECU) with 1 connector *B Main Body ECU (Multiplex Network Body ECU) with 3 connectors
    *1 Main Body ECU (Multiplex Network Body ECU) - -

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

      for LHD:

      Click here

      for RHD:

      Click here

    2. Connect the instrument panel junction block assembly connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A-32 (IG) - Body ground - Ignition power supply Ignition switch ON

      11 to 14 V*1

      10.5 to 14 V*2
      Ignition switch off Below 1 V
      A-30 (BECU) - Body ground - Battery power supply Always 11 to 14 V
      A-29 (ACC) - Body ground - ACC power supply Ignition switch ACC 11 to 14 V
      Ignition switch off Below 1 V
      A-11 (GND1) - Body ground - Ground Always Below 1 Ω

      *1: w/o Stop and Start System

      *2: w/ Stop and Start System

      If the result is not as specified, there may be a malfunction in the wire harness or instrument panel junction block assembly.

    4. Install the main body ECU (multiplex network body ECU).

      for LHD:

      Click here

      for RHD:

      Click here

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G78-1 (RFOG) - Body ground*1 L - Body ground Rear fog light switch input Rear fog light switch on Below 1 V
      Rear fog light switch off 11 to 14 V
      G78-5 (HU) - Body ground Y - Body ground Headlight dimmer switch high signal input Headlight dimmer switch in high position Below 1 V
      Headlight dimmer switch in low position

      Pulse generation*9

      11 to 14 V*10
      G78-8 (HF) - Body ground R - Body ground Headlight dimmer switch high flash signal input Headlight dimmer switch in high flash position Below 1 V
      Headlight dimmer switch not in high flash position 11 to 14 V
      G78-19 (FRCY) - Body ground*2 L - Body ground Front door courtesy light switch RH signal Front door RH open Below 1 V
      Front door RH closed Pulse generation
      G78-20 (CLTB) - G78-22 (CLTE)*3 W - V Automatic light control sensor power supply output Ignition switch off Below 1 V
      Ignition switch ON and headlight dimmer switch in AUTO position 11 to 14 V
      G78-21 (CLTS) - Body ground*3 G - Body ground Automatic light control sensor signal input Ignition switch off Below 1 V

      Ignition switch ON

      Headlight dimmer switch in AUTO position

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

      		 Pulse generation (See waveform 1)
      G78-27 (FFOG) - Body ground*4 GR - Body ground Front fog light switch input Front fog light switch on Below 1 V
      Front fog light switch off

      Pulse generation*9

      11 to 14 V*10
      G78-28 (A) - Body ground*3 G - Body ground Headlight dimmer switch AUTO signal input Headlight dimmer switch in AUTO position Below 1 V
      Headlight dimmer switch not in AUTO position

      Pulse generation*9

      11 to 14 V*10
      G78-29 (HEAD) - Body ground L - Body ground Headlight dimmer switch head signal input Headlight dimmer switch in head position Below 1 V
      Headlight dimmer switch not in head position 11 to 14 V
      G78-30 (TAIL) - Body ground W - Body ground Headlight dimmer switch tail signal input Headlight dimmer switch in tail or head position Below 1 V
      Headlight dimmer switch in neither tail nor head position 11 to 14 V
      G79-21 (RLEW) - Body ground SB - Body ground Light control signal input

      Ignition switch ON

      Headlight dimmer switch not in head position

      		 Pulse generation

      Ignition switch ON

      Headlight dimmer switch off

      		 11 to 14 V
      G79-24 (LLEW) - Body ground L - Body ground Light control signal input

      Ignition switch ON

      Headlight dimmer switch not in head position

      		 Pulse generation

      Ignition switch ON

      Headlight dimmer switch off

      		 11 to 14 V
      3B-37 (HRLY) - Body ground BR - Body ground H-LP relay drive output Headlight dimmer switch in head position Below 1 V
      Headlight dimmer switch not in head position 11 to 14 V
      3B-52 (DRLE) - Body ground*5, *7 B - Body ground DRL relay drive output Daytime running light on Below 1 V
      Daytime running light off 11 to 14 V
      3D-10 (DRLE) - Body ground*5, *8 B - Body ground DRL relay drive output Daytime running light on Below 1 V
      Daytime running light off 11 to 14 V
      3B-54 (DIM) - Body ground LG - Body ground Running light relay drive output Headlight dimmer switch in high or high flash position Below 1 V
      Headlight dimmer switch not in high or high flash position 11 to 14 V
      3B-56 (FFGO) - Body ground*4 W - Body ground Front fog light signal output Headlight dimmer switch in tail position and front fog light switch on Below 1 V
      Front fog light switch off 11 to 14 V
      3D-34 (PKB) - Body ground*5 B - Body ground Parking brake switch input Parking brake switch on Below 1 V
      Parking brake switch off 11 to 14 V
      3D-52 (RFGO) - Body ground*1 W - Body ground Rear fog light signal output Headlight dimmer switch in tail position and rear fog light switch on Below 1 V
      Rear fog light switch off 11 to 14 V
      3E-40 (FLCY) - Body ground*6 W - Body ground Front door courtesy light switch LH signal Front door LH open Below 1 V
      Front door LH closed Pulse generation

      *1: w/ Rear Fog Light

      *2: for RHD

      *3: w/ Automatic Light Control System

      *4: w/ Front Fog Light

      *5: w/ Daytime Running Light

      *6: for LHD

      *7: w/ Front Power Seat Control System (w/ Memory)

      *8: w/ Front Power Seat Control System (w/o Memory)

      *9: Main Body ECU (multiplex network body ECU) with 3 Connectors

      *10: Main Body ECU (multiplex network body ECU) with 1 Connector


      1. A01VABNE01

        Waveform 1

        Item Content
        Terminal No. (Symbol) G78-21 (CLTS) - Body ground
        Tool setting 5 V/DIV., 5 ms./DIV.
        Condition

        Ignition switch ON

        Headlight dimmer switch in AUTO position

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

        Tech Tips

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

  2. CHECK COMBINATION METER ASSEMBLY

    A01V788N04

    1. Disconnect the G16 and G17 combination meter connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G16-21 (ET) - Body ground BR - Body ground Ground Always Below 1 Ω
      G16-39 (IG+) - Body ground

      B - Body ground*1

      P - Body ground*2

      		 Ignition power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      G16-40 (B) - Body ground Y - Body ground Battery power supply Always 11 to 14 V
      G17-1 (B) - Body ground L - Body ground Battery power supply Always 11 to 14 V

      *1: w/o Stop and Start System

      *2: w/ Stop and Start System

    3. Reconnect the G16 and G17 combination meter connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G16-29 (HAZ) - Body ground BE - Body ground Headlight dimmer switch (turn signal switch) left or right turn position signal input

      Ignition switch ON

      Headlight dimmer switch (turn signal switch) off

      		 11 to 14 V

      Ignition switch ON

      Headlight dimmer switch (turn signal switch) in left or right turn position

      		 Below 1 V
      G17-3 (HAZ) - Body ground GR - Body ground Hazard warning signal switch signal input Hazard warning signal switch off 11 to 14 V
      Hazard warning signal switch on Below 1 V
      G17-9 (ER) - Body ground SB - Body ground Headlight dimmer switch (turn signal switch) right turn position signal input

      Ignition switch ON

      Headlight dimmer switch (turn signal switch) off

      		 11 to 14 V

      Ignition switch ON

      Headlight dimmer switch (turn signal switch) in right turn position

      		 Below 1 V
      G17-10 (EL) - Body ground LG - Body ground Headlight dimmer switch (turn signal switch) left turn position signal input

      Ignition switch ON

      Headlight dimmer switch (turn signal switch) off

      		 Below 1 V

      Ignition switch ON

      Headlight dimmer switch (turn signal switch) in right turn position

      		 Below 1 V ←→ 11 to 14 V
      G17-7 (LR) - Body ground L - Body ground RH turn signal light signal output

      Ignition switch ON

      RH turn signal light off

      		 Below 1 V

      Ignition switch ON

      RH turn signal light blinking

      		 Below 1 V ←→ 11 to 14 V
      G17-13 (LL) - Body ground Y - Body ground LH turn signal light signal output

      Ignition switch ON

      LH turn signal light off

      		 Below 1 V

      Ignition switch ON

      LH turn signal light blinking

      		 Below 1 V ←→ 11 to 14 V