AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM TERMINALS OF ECU


  1. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH

    B0058SBC06
    *A for Triple Beam Headlight - -

    1. Disconnect the A19 headlight sub-assembly LH 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
      A19-4 (IG) - Body ground L - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A19-13 (ECUB) - Body ground R - Body ground Power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A19-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the A19 headlight ECU sub-assembly LH connector.

      Tech Tips

      Since the headlight ECU sub-assembly LH uses waterproof connectors, the voltage, resistance and waveform cannot be checked directly. The voltage, resistance and waveform are indicated for reference only.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A19-16 (SBR) - A19-15 (SGR) R - P Rear height control sensor power supply Engine switch on (IG) Approximately 5 V
      A19-17 (SHRL) - A19-15 (SGR) L - P Rear height control sensor signal input (No passengers, no luggage, vehicle not moving)

      Approximately 2.5 V

      (vehicle level) (value decreases as the front of the vehicle is raised)

  2. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH

    B0058SBC07
    *A for Triple Beam Headlight - -

    1. Disconnect the A20 headlight ECU sub-assembly RH 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
      A20-4 (IG) - Body ground G - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A20-13 (ECUB) - Body ground B - Body ground Power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A20-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

  3. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY, MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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