LIGHTING SYSTEM(w/o Automatic Headlight Beam Level Control System) TERMINALS OF ECU


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

    B0070ETN01

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

    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
      3B-3 - Body ground LA - Body ground Ground Always Below 1 Ω
      3C-1 - Body ground LG - Body ground Battery power supply Always 11 to 14 V
      3F-1 - Body ground

      W - Body ground*1

      B - Body ground*2

      		 Battery power supply Always 11 to 14 V

      • *1: Alternator 100A Type

      • *2: Alternator 130A Type

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

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      3A-40 - Body ground LA-G - Body ground BKUP LP relay drive output Ignition switch off Below 1 V
      Ignition switch ACC 11 to 14 V
      3C-19 - Body ground BE - Body ground BKUP LP relay drive output Ignition switch off, shift lever not in R Below 1 V
      Ignition switch ON, shift lever in R 11 to 14 V
      3C-23 - Body ground LA-P - Body ground BKUP LP relay drive output Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      3C-25 - Body ground* BE - Body ground FOG FR relay 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 position 11 to 14 V
      3C-28 - Body ground GR - Body ground Daytime running light system drive output Daytime running light system operating Below 1 V
      Daytime running light system not operating 11 to 14 V
      3C-31 - Body ground V - Body ground H-LP LH relay drive output Light control switch in head position Below 1 V
      Light control switch off 11 to 14 V
      3C-32 - Body ground LA-B - Body ground Clearance lights drive output Light control switch in tail or head position 11 to 14 V
      Light control switch off Below 1 V
      3D-10 - Body ground LG - Body ground Back-up lights drive output Ignition switch off, shift lever not in R Below 1 V
      Ignition switch ON, shift lever in R 11 to 14 V
      3D-21 - Body ground LG - 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 position Below 1 V
      3D-30 - Body ground LA-B - Body ground Taillights and license plate lights drive output Light control switch in tail or head position 11 to 14 V
      Light control switch off Below 1 V
      K51-14 (LLEW) - Body ground GR - Body ground Light control ECU signal input Ignition switch ON, light control switch off 11 to 14 V
      Ignition switch ON, light control switch in head position Pulse generation
      K51-15 (RLEW) - Body ground R - Body ground Light control ECU signal input Ignition switch ON, light control switch off 11 to 14 V
      Ignition switch ON, light control switch in head position Pulse generation
      K51-19 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      K52-12 (HRY2) - Body ground BE - Body ground H-LP RH relay drive output Light control switch in head position Below 1 V
      Light control switch off 11 to 14 V
      K52-13 (DIM) - Body ground G - Body ground High beam headlight drive output Light control switch in head position and dimmer switch in high or high flash position Below 1 V
      Dimmer switch not in high or high flash position 11 to 14 V
      K52-16 (HEAD) - Body ground LG - Body ground Light control switch head position input Light control switch in head position Below 1 V
      Light control switch not in head position 11 to 14 V
      K52-23 (CLTB) - K52-25 (CLTE) BE - GR Automatic light control sensor power supply output Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      K52-24 (CLTS) - Body ground R - Body ground Automatic light control sensor signal input Ignition switch off Below 1 V
      Ignition switch ON

      Pulse generation

      (See waveform 1)

      • *: w/ Front Fog Light


      1. B0070APN01

        Waveform 1

        Item Content
        Tester Connection K52-24 (CLTS) - Body ground
        Tool setting 2 V/DIV., 10 ms./DIV.
        Condition Ignition switch ON

        Tech Tips

        The communication waveform changes according to the surrounding brightness.

  2. CHECK COMBINATION METER ASSEMBLY

    Click here

  3. CHECK STEERING SENSOR

    Click here