AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM TERMINALS OF ECU


  1. CHECK HEADLIGHT LEVELING ECU

    A00YRVIN10

    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. A00YR7PN01

        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)

        Tech Tips

        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.