AUTOMATIC HIGH BEAM SYSTEM TERMINALS OF ECU


  1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND 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

      B002HZ8C13
      *1 Main Body ECU (Multiplex Network Body ECU) - -

    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 Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      A-31 (BECU) - Body ground - Auxiliary battery power supply Power switch off 11 to 14 V
      A-30 (ACC) - Body ground - ACC power supply Power switch off Below 1 V
      Power switch on (ACC) 11 to 14 V
      A-11 (GND1) - Body ground - Ground Always Below 1 Ω

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

      for LHD:

      Click here

      for RHD:

      Click here

    5. Measure the voltage and check the waveform between each connector terminal using an oscilloscope according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      I48-20 (CLTS) - Body ground P - Body ground Automatic light control sensor signal input Power switch off Below 1 V
      Power switch on (IG), headlight dimmer switch in AUTO position, material which blocks light used to cover and then uncover top of automatic light control sensor

      Communication waveform generation

      (See waveform 1)
      I48-24 (HU) - Body ground Y - Body ground Headlight dimmer switch high signal input

      • Headlight dimmer switch in low position (When vehicle has the dimmer switch off position)

      • Low beams illuminated with headlight dimmer switch in AUTO position (When vehicle does not have the dimmer switch off position)*

      		 11 to 14 V
      Headlight dimmer switch in high position Below 1 V
      I48-13 (CANL) - Body ground W - Body ground CAN communication line Power switch on (IG) Pulse generation
      I48-14 (CANH) - Body ground Y - Body ground CAN communication line Power switch on (IG) Pulse generation
      I47-23 (AHBI) - Body ground P - Body ground Auto high beam switch signal input Combination switch assembly (automatic high beam main switch) on Below 1 V
      Combination switch assembly (automatic high beam main switch) off 11 to 14 V

      *: Low beams do not illuminate in daytime mode. It is necessary to cover the top of the automatic light control sensor with a material which blocks light to activate nighttime mode.


      1. B002L30E02

        Waveform 1

        Item Content
        Terminal No. (Symbol) I48-20 (CLTS) - Body ground
        Tool setting 2 V/DIV., 10 ms./DIV.
        Condition Power switch on (IG), headlight dimmer switch in AUTO position, material which blocks light used to cover and then uncover top of automatic light control sensor

        Tech Tips

        The communication waveform changes according to the surrounding brightness.

  2. CHECK LANE DEPARTURE WARNING CAMERA

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