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 RHD:

      Click here

      for LHD:

      Click here

      B005AH5C13
      *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 Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A-31 (BECU) - Body ground - Battery power supply Engine switch off 11 to 14 V
      A-30 (ACC) - Body ground - ACC power supply Engine switch off Below 1 V
      Engine 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 Engine switch off Below 1 V
      Engine 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 Engine switch on (IG) Pulse generation
      I48-14 (CANH) - Body ground Y - Body ground CAN communication line Engine 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. B0056ZRE02

        Waveform 1

        Item Content
        Terminal No. (Symbol) I48-20 (CLTS) - Body ground
        Tool setting 2 V/DIV., 10 ms./DIV.
        Condition Engine 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

    Click here

  3. CHECK LANE DEPARTURE WARNING CAMERA (w/ Steering Control)

    Click here