LIGHTING SYSTEM TERMINALS OF ECU


  1. CHECK HEADLIGHT SWIVEL ECU ASSEMBLY

    A01FEJCE03

    1. Disconnect the A7 headlight swivel ECU connector.

    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
      A7-14 (IGS) - Body ground LG - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A7-15 (IG) - Body ground L - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A7-22 (E1) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the A7 headlight swivel ECU connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A7-1 (SMBL) - A7-22 (E1)*1 SB - W-B Headlight swivel motor LH power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A7-2 (SMBR) - A7-22 (E1)*1 B - W-B Headlight swivel motor RH power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A7-3 (LHT) - A7-22 (E1)*2 V - W-B Headlight swivel motor LH (leveling portion) power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A7-4 (RHT) - A7-22 (E1)*2 G - W-B Headlight swivel motor RH (leveling portion) power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A7-7 (INIT) - A7-22 (E1) V - W-B Initialization signal Engine switch on (IG), terminals LVL and GND of DLC3 connected Below 1 V
      Engine switch on (IG), terminals LVL and GND of DLC3 not connected 4.5 to 5.5 V
      A7-10 (SMR) - A7-22 (E1)*1 W - W-B Headlight swivel motor RH LIN communication Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A7-11 (RH+) - A7-22 (E1) P - W-B Headlight swivel motor RH (leveling portion) LIN communication Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A7-18 (SBR) - A7-21 (SGR) B - R Rear height control sensor LH power supply Engine switch off Below 1 V
      Engine switch on (IG) 4.5 to 5.5 V
      A7-19 (SHRL) - A7-21 (SGR) P - R Rear height control sensor LH signal Engine switch off Below 1 V
      Engine switch on (IG)

      Approximately 2.5 V (When vehicle level)

      (The value changes according to the vehicle height)
      A7-21 (SGR) - A7-22 (E1) R - W-B Rear height control sensor LH ground Always Below 1 Ω
      A7-23 (SMGL) - A7-22 (E1) LG - W-B Headlight swivel motor LH ground Always Below 1 Ω
      A7-24 (SMGR) - A7-22 (E1) L - W-B Headlight swivel motor RH ground Always Below 1 Ω
      A7-29 (SML) - A7-22 (E1)*1 Y - W-B Headlight swivel motor LH LIN communication Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A7-30 (LH+) - A7-22 (E1) R - W-B Headlight swivel motor LH (leveling portion) LIN communication Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A7-32 (MSW) - Body ground*1 GR - Body ground Headlight swivel main switch signal Engine switch on (IG), headlight swivel main switch on Below 1 V
      Engine switch on (IG), headlight swivel main switch off 11 to 14 V

      • *1: w/ AFS

      • *2: w/o AFS

  2. CHECK COWL SIDE JUNCTION BLOCK LH, MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    A01FG8NE01
    Text in Illustration
    *1 Main Body ECU (Multiplex Network Body ECU) - -

    1. Remove the main body ECU from the cowl side junction block LH Click here.

    2. Connect the cowl side junction block LH connectors.

    3. Measure the resistance and voltage 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 Engine switch on (IG) 11 to 14 V
      A-30 (BECU) - Body ground - Battery power supply Always 11 to 14 V
      A-29 (ACC) - Body ground - ACC power supply Engine switch on (ACC) 11 to 14 V
      A-11 (GND1) - Body ground - Ground Always Below 1 Ω

    4. Install the main body ECU 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
      N12-5 (HU) - Body ground P - Body ground Headlight dimmer switch high signal input Headlight dimmer switch in high position Below 1 V
      Headlight dimmer switch in low position 11 to 14 V
      N12-8 (HF) - Body ground L - 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
      N12-28 (A) - Body ground R - Body ground Headlight dimmer switch AUTO signal input Headlight dimmer switch in AUTO position Below 1 V
      Headlight dimmer switch not in AUTO position 11 to 14 V
      N12-29 (HEAD) - Body ground LG - 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
      N12-30 (TAIL) - Body ground B - 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
      N12-20 (CLTB) - N12-22 (CLTE) GR - W Automatic light control sensor power supply output Engine switch off Below 1 V
      Engine switch on (IG) and headlight dimmer switch in AUTO position 11 to 14 V
      N12-21 (CLTS) - Body ground R - Body ground Automatic light control sensor signal input Engine switch off Below 1 V

      Engine switch on (IG)

      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)
      N12-27 (FFOG) - Body ground*1 B - Body ground Front fog light switch input Front fog light switch on Below 1 V
      Front fog light switch off 11 to 14 V
      N13-17 (AHBI) - Body ground*2 Y - Body ground Automatic high beam main switch input Automatic high beam main switch on Below 1 V
      Automatic high beam main switch off 11 to 14 V
      N13-23 (RFOG) - Body ground*3 GR - Body ground Rear fog light switch input Rear fog light switch on Below 1 V
      Rear fog light switch off 11 to 14 V
      5D-9 (HRLY) - Body ground Y - Body ground H-LP LO relay drive output Headlight dimmer switch in head position Below 1 V
      Headlight dimmer switch not in head position 11 to 14 V
      5D-11 (TRLY) - Body ground W - Body ground No. 2 integration relay (TAIL relay) drive output Headlight dimmer switch in tail position Below 1 V
      Headlight dimmer switch not in tail position 11 to 14 V
      5D-21 (DIM) - Body ground LG - Body ground No. 2 integration relay (DIMMER 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
      5D-22 (FFGO) - Body ground*1 GR - 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
      5D-23 (DRL) - Body ground G - Body ground No. 2 integration relay (DRL relay) drive output Daytime running light on Below 1 V
      Daytime running light off 11 to 14 V
      5C-16 (RFGO) - Body ground*3 GR - 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
      5C-44 (FLCY) - Body ground*4 R - Body ground Front door courtesy light switch LH signal Front door LH open Below 1 V
      Front door LH closed Pulse generation
      5A-33 (FRCY) - Body ground*5 R - Body ground Front door courtesy light switch RH signal Front door RH open Below 1 V
      Front door RH closed Pulse generation

      • *1: w/ Front Fog Light

      • *2: w/ Automatic High Beam System

      • *3: w/ Rear Fog Light

      • *4: for LHD

      • *5: for RHD


      1. A01FDTXE01

        Waveform

        Item Content
        Terminal No. (Symbol) N12-21 (CLTS) - Body ground
        Tool setting 5 V/DIV., 5 ms./DIV.
        Condition

        Engine switch on (IG)

        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.

  3. CHECK COMBINATION METER ASSEMBLY

    A01FE14E01

    1. Disconnect the N39 and N40 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
      N40-22 (B) - Body ground P - Body ground Battery power supply Always 11 to 14 V
      N40-21 (IG+) - Body ground B - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      N39-1 (B) - Body ground W - Body ground Battery power supply Always 11 to 14 V
      N39-11 (HZSW) - Body ground P - Body ground Hazard warning signal switch signal input Hazard warning signal switch on Below 1 Ω
      Hazard warning signal switch off 10 kΩ or higher
      N40-30 (ES) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the N39 and N40 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
      N39-9 (ER) - Body ground GR - Body ground Turn signal switch (right turn position) signal input

      Engine switch on (IG)

      Turn signal switch off

      		 11 to 14 V

      Engine switch on (IG)

      Turn signal switch in right turn position

      		 Below 1 V
      N39-10 (EL) - Body ground G - Body ground Turn signal switch (left turn position) signal input

      Engine switch on (IG)

      Turn signal switch off

      		 11 to 14 V

      Engine switch on (IG)

      Turn signal switch in left turn position

      		 Below 1 V
      N39-7 (LL) - Body ground Y - Body ground LH 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 blinking

      		 Below 1 V ←→ 11 to 14 V
      N39-13 (LR) - Body ground G - Body ground RH 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 blinking

      		 Below 1 V ←→ 11 to 14 V

  4. CHECK INNER REAR VIEW MIRROR ASSEMBLY (w/ Automatic High Beam System)

    A01FEHYE01

    1. Disconnect the Y8 inner rear view mirror connector.

    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
      Y8-6 (+B) - Body ground R - Body ground Battery power supply Always 11 to 14 V
      Y8-1 (IG) - Body ground SB - Body ground Ignition power supply Engine switch on (IG) 11 to 14 V
      Y8-2 (E) - Body ground W-B - Body ground Inner rear view mirror ground Always Below 1 Ω

    3. Reconnect the Y8 inner rear view mirror connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      Y8-10 (LIN) - Body ground R - Body ground LIN communication Automatic high beam system operates

      Pulse generation

      (See waveform)

      1. A01FE03E02

        Waveform

        Item Content
        Terminal No. (Symbol) Y8-10 (LIN) - Body ground
        Tool setting 2 V/DIV., 10 ms./DIV.
        Condition Automatic high beam system operates