AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM(for Single Beam Headlight) TERMINALS OF ECU


  1. CHECK HEADLIGHT LEVELING ECU ASSEMBLY


    1. Disconnect the A61 headlight leveling ECU assembly connector.

      A01WXFUN32

    2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

      Standard Voltage
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A61-1 (IG) - Body ground B - 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
      A61-9 (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 A61 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
      A61-21 (SGR) - Body ground LG - Body ground Rear height control sensor sub-assembly LH ground Always Below 1 Ω
      A61-23 (RH-) - Body ground V - Body ground Headlight leveling motor RH ground Always Below 1 Ω
      A61-24 (LH-) - Body ground BE - Body ground Headlight leveling motor LH ground Always Below 1 Ω
      Standard Voltage
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A61-10 (RH+) - Body ground BE - Body ground Headlight leveling motor RH power supply Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      A61-11 (LH+) - Body ground W - Body ground Headlight leveling motor LH power supply Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      A61-12 (SBR) - Body ground GR - Body ground Rear height control sensor sub-assembly LH power supply Power switch off Below 1 V
      Power switch on (IG) 4.75 to 5.25 V
      A61-17 (RHT) - Body ground SB - Body ground Headlight 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
      A61-18 (LHT) - Body ground SB - Body ground Headlight 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
      A61-19 (SHRL) - Body ground G - Body ground Rear height control sensor sub-assembly LH 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 be malfunctioning.