AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM TERMINALS OF ECU


  1. CHECK HEADLIGHT LEVELING ECU ASSEMBLY


    1. Disconnect the A63 headlight leveling ECU assembly connector.

      A0041CYE30

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

      Standard Voltage
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A63-1 (IG) - Body ground LG - Body ground IG power supply Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      Standard Resistance
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A63-9 (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 A63 headlight leveling ECU assembly connector.

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

      Standard Resistance
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A63-21 (SGR) - Body ground Y - Body ground Rear height control sensor ground Always Below 1 Ω
      A63-23 (RH-) - Body ground BR - Body ground Leveling motor RH ground Always Below 1 Ω
      A63-24 (LH-) - Body ground LG - Body ground Leveling motor LH ground Always Below 1 Ω
      Standard Voltage
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A63-3 (HDLP) - Body ground V - Body ground Low beam headlight signal input Low beam headlights on Below 1.5 V
      Low beam headlights off 5 V or higher
      A63-5 (INIT) - Body ground B - Body ground Initialization signal input Power switch on (IG), terminals LVL and GND of DLC3 connected Below 1 V
      Power switch on (IG), terminals LVL and GND of DLC3 not connected Approx. 5 V
      A63-6 (WNG) - Body ground L - Body ground Warning indicator drive output Power switch on (IG), warning indicator on Below 1 V
      Power switch on (IG), warning indicator off 11 to 14 V
      A63-10 (RH+) - Body ground W - Body ground Leveling motor RH power supply Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      A63-11 (LH+) - Body ground R - Body ground Leveling motor LH power supply Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      A63-12 (SBR) - Body ground P - Body ground Rear height control sensor power supply Power switch off Below 1 V
      Power switch on (IG) 4.75 to 5.25 V
      A63-16 (SPDR) - Body ground V - Body ground Vehicle speed signal input Vehicle is driven at approx. 20 km/h (12mph)

      Pulse generation

      (See waveform 1)
      A63-17 (RHT) - Body ground B - Body ground Leveling motor RH operation signal input With low beam headlights on, vehicle height not changed Below 1 V
      With low beam headlights on, change vehicle height and keep for more than 3 seconds 1.0 to 14.4 V
      A63-18 (LHT) - Body ground G - Body ground Leveling motor LH operation signal input With low beam headlights on, vehicle height not changed Below 1 V
      With low beam headlights on, change vehicle height and keep for more than 3 seconds 1.0 to 14.4 V
      A63-19 (SHRL) - Body ground SB - Body ground Rear height control sensor signal input Power switch off Below 1 V
      Power switch on (IG) 0.5 to 4.5 V

      If the result is not as specified, the headlight leveling ECU assembly may have a malfunction.


      1. A003ZX5

        Waveform 1

        Item Content
        Tool setting 2 V/DIV., 2 ms./DIV.