AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM TERMINALS OF ECU

  1. CHECK HEADLIGHT LEVELING ECU

    E101528N10

    1. Disconnect the A67 headlight leveling ECU connector.

    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

      A67-1 (IG) - Body ground

      L - Body ground

      Ignition power supply

      Ignition switch off

      Below 1 V

      Ignition switch ON

      11 to 14 V

      A67-9 (E1) - 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 A67 headlight leveling ECU connector.

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

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      A67-3 (HDLP) - A67-9 (E1)

      BR - W-B

      Low beam headlight signal input

      Low beam headlights on

      Below 1 V

      Low beam headlights off

      11 to 14 V

      A67-5 (INIT) - A67-9 (E1)

      Y - W-B

      Initialization signal input

      Terminal LVL and terminal CG of DLC3 connected

      Below 1 V

      Terminal LVL and terminal CG of DLC3 not connected

      4.5 to 5.5 V

      A67-6 (WNG) - A67-9 (E1)

      LG - W-B

      Warning light drive output

      Warning light on

      Below 1 V

      Warning light off

      11 to 14 V

      A67-10 (RH+) - A67-9 (E1)

      G - W-B

      Leveling motor RH power supply

      Ignition switch off

      Below 1 V

      Ignition switch ON

      11 to 14 V

      A67-11 (LH+) - A67-9 (E1)

      W - W-B

      Leveling motor LH power supply

      Ignition switch off

      Below 1 V

      Ignition switch ON

      11 to 14 V

      A67-12 (SBR) - A67-21 (SGR)

      R - BR

      Rear height control sensor power supply

      Ignition switch off

      Below 1 V

      Ignition switch ON

      4.75 to 5.25 V

      A67-16 (SPDR) - A67-9 (E1)

      V - W-B

      Vehicle speed signal input

      Vehicle is driven at approximately 20 km/h (12 mph)

      Pulse generation (See waveform 1)

      A67-17 (RHT) - A67-9 (E1)

      Y - W-B

      Leveling motor RH operation signal input

      With low beam headlights on, vehicle height not changed

      Below 1 V

      With low beam headlights on, vehicle height changed and maintained for more than 3 seconds

      1.0 to 14.4 V

      A67-18 (LHT) - A67-9 (E1)

      BR - W-B

      Leveling motor LH operation signal input

      With low beam headlights on, vehicle height not changed

      Below 1 V

      With low beam headlights on, vehicle height changed and maintained for more than 3 seconds

      1.0 to 14.4 V

      A67-19 (SHRL) - A67-21 (SGR)

      Y - BR

      Rear height control sensor signal input

      Ignition switch off

      Below 1 V

      Ignition switch ON

      0.5 to 4.5 V

      A67-21 (SGR) - A67-9 (E1)

      BR - W-B

      Rear height control sensor ground

      Always

      Below 1 Ω

      A67-23 (RH-) - A67-9 (E1)

      W-B - W-B

      Leveling motor RH ground

      Always

      Below 1 Ω

      A67-24 (LH-) - A67-9 (E1)

      W-B - W-B

      Leveling motor LH ground

      Always

      Below 1 Ω
      1. E251775N01

        Waveform 1

        Item

        Content

        Terminal No. (Symbol)

        A67-16 (SPDR) - A67-9 (E1)

        Tool setting

        5 V/DIV., 20 ms./DIV.

        Condition

        Vehicle is driven at approximately 20 km/h (12 mph)
        Tip:

        When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.