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LIGHTING SYSTEM TERMINALS OF ECU

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  1. A017DINE12

    CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)


    1. Disconnect the 1A, 1F and 1M junction block connectors.

    2. Measure the voltage and resistance between the specified terminals of the wire harness side connectors and body ground.

      Standard voltage
      Symbols Wiring Color Terminal Description Condition Specified Condition
      1A-1 - Body ground B - Body ground Battery power supply Always 11 to 14 V
      Standard resistance
      Symbols Wiring Color Terminal Description Condition Specified Condition
      1F-10 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      1M-9 (GND2) - 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 1A, 1F and 1M junction block connectors.

    4. Measure the resistance and voltage between the specified terminals of the junction block connectors and body ground.

      Standard resistance
      Symbols Wiring Color Terminal Description Condition Specified Condition

      D6-18 (CLTE)*2 - Body ground

      		 BR - Body ground Automatic light control ground Always Below 1 Ω
      Standard voltage
      Symbols Wiring Color Terminal Description Condition Specified Condition
      1D-3 (HRLY) - Body ground P - Body ground Headlight relay drive output Light control switch in HEAD Below 1 V
      Light control switch not in HEAD 11 to 14 V
      1D-9 (DIM) - Body ground L - Body ground High beam headlights drive output Dimmer switch in HIGH or HIGH FLASH Below 1 V
      Dimmer switch in LOW 11 to 14 V

      1I-10 (ILE)*1 - Body ground

      		 BR - Body ground Ignition key cylinder light drive output Ignition key cylinder light ON Below 1 V
      Ignition key cylinder light OFF 11 to 14 V
      1N-2 (HU) - Body ground LG - Body ground Dimmer switch HIGH input Dimmer switch in HIGH or HIGH FLASH Below 1 V
      Dimmer switch in LOW 11 to 14 V
      1O-7 (LCTY) - Body ground B - Body ground Rear door courtesy switch LH input Rear door LH open Below 1 V
      Rear door LH closed 11 to 14 V
      1P-5 (LSWL) - Body ground G - Body ground Rear door lock position switch LH input Rear door LH locked 11 to 14 V
      Rear door LH unlocked Below 1 V
      1R-5 (ILE) - Body ground SB - Body ground Interior lights drive output Interior lights ON Below 1 V
      Interior lights OFF 11 to 14 V

      D6-4 (MLRY)*3 - Body ground

      		 R - Body ground Door mirror foot light drive output Door mirror foot light ON Below 1 V
      Door mirror foot light OFF 11 to 14 V
      D6-5 (LSWR) - Body ground B - Body ground Rear door lock position switch RH input Rear door RH locked 11 to 14 V
      Rear door RH unlocked Below 1 V
      D6-7 (RCTY) - Body ground GR - Body ground Rear door courtesy switch RH input Rear door RH open Below 1 V
      Rear door RH closed 11 to 14 V

      D6-9 (RFOG)*5 - Body ground

      		 SB - Body ground Rear fog light switch input Rear fog light switch ON Below 1 V
      Rear fog light switch OFF 11 to 14 V
      D6-17 (HEAD) - Body ground P - Body ground Light control switch HEAD input Light control switch in HEAD Below 1 V
      Light control switch not in HEAD 11 to 14 V

      D6-19 (CLTS)*2 - Body ground

      		 G - Body ground Automatic light control sensor signal input Ignition switch off Below 1 V
      Automatic light control system operates

      Pulse generation

      (See waveform 1)

      D6-20 (CLTB)*2 - Body ground

      		 B - Body ground Automatic light control sensor power supply output Ignition switch off Below 1 V
      Ignition switch on (IG) and light control switch in AUTO 11 to 14 V
      D6-21 (PCTY) - Body ground

      SB (for LHD) - Body ground

      G (for RHD) - Body ground

      		 Front passenger side door courtesy switch input Front passenger side door open Below 1 V
      Front passenger side door closed 11 to 14 V
      D6-25 (BCTY) - Body ground L - Body ground Back door courtesy switch input Back door open Below 1 V
      Back door closed 11 to 14 V
      D6-27 (LSWP) - Body ground

      SB (for LHD) - Body ground

      W (for RHD) - Body ground

      		 Front passenger side door lock position switch input Front passenger side door locked 11 to 14 V
      Front passenger side door unlocked Below 1 V

      D6-28 (FFOG)*4 - Body ground

      		 O - Body ground Front fog light switch input Front fog light switch ON Below 1 V
      Front fog light switch OFF 11 to 14 V

      D7-4 (FFGO)*4 - Body ground

      		 O - Body ground Front fog light relay drive output Light control switch in HEAD and front fog light switch ON Below 1 V
      Front fog light switch OFF 11 to 14 V
      D7-9 (LSWD) - Body ground GR - Body ground Driver side door lock position switch input Driver side door locked 11 to 14 V
      Driver side door unlocked Below 1 V
      D7-13 (HF) - Body ground R - Body ground Dimmer switch HIGH FLASH signal input Dimmer switch in HIGH FLASH position Below 1 V
      Dimmer switch not in HIGH FLASH position 11 to 14 V

      D7-21 (A)*2 - Body ground

      		 G - Body ground Light control switch AUTO signal input Light control switch in AUTO Below 1 V
      Light control switch not in AUTO 11 to 14 V
      D7-23 (TAIL) - Body ground SB - Body ground Light control switch TAIL signal input Light control switch in TAIL or HEAD Below 1 V
      Light control switch in neither TAIL nor HEAD 11 to 14 V
      D7-24 (DCTY) - Body ground

      G (for LHD) - Body ground

      SB (for RHD) - Body ground

      		 Driver side door courtesy switch input Driver side door open Below 1 V
      Driver side door closed 11 to 14 V

      D7-25 (SWIL)*2 - Body ground

      		 R - Body ground Engine switch illumination drive output Engine switch illumination ON 11 to 14 V
      Engine switch illumination OFF Below 1 V

      D8-14 (RFGO)*5 - Body ground

      		 R - Body ground Rear fog light relay drive output Light control switch in HEAD and rear fog light switch ON Below 1 V
      Rear fog light switch OFF 11 to 14 V

      If the result is not as specified, the main body ECU (Instrument panel junction block) may have a malfunction.

      Tip:

      *1: w/o Smart Entry and Start System

      *2: w/ Smart Entry and Start System

      *3: w/ Door Mirror Foot Light

      *4: w/ Front Fog Light

      *5: w/ Rear Fog Light


      1. A017BDQE01

        Waveform 1

        Item Contents
        Tool setting 5 V/DIV., 5 ms./DIV.
        Tip:

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