AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM TERMINALS OF ECU


  1. CHECK HEADLIGHT LEVELING ECU ASSEMBLY


    1. Disconnect the A67 headlight leveling ECU assembly connector.

      A018L45N26

    2. Measure the voltage 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
      A67-1 (IG) - Body ground G - Body ground IG power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V

      If the result is not as specified, there may be a malfunction on the wire harness side.

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

      Standard Resistance
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      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.

    4. Reconnect the A67 headlight leveling ECU assembly connector.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A67-21 (SGR) - Body ground BE - Body ground Rear height control sensor sub-assembly ground Always Below 1 Ω
      A67-23 (RH-) - Body ground BE - Body ground Headlight leveling motor RH ground Always Below 1 Ω
      A67-24 (LH-) - Body ground GR - Body ground Headlight leveling motor LH ground Always Below 1 Ω

      If the result is not as specified, the headlight leveling ECU assembly may be malfunctioning.

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

      Standard Voltage
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A67-10 (RH+) - Body ground LG - Body ground Headlight leveling motor RH power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      A67-11 (LH+) - Body ground SB - Body ground Headlight leveling motor LH power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      A67-12 (SBR) - Body ground L - Body ground Rear height control sensor sub-assembly power supply Ignition switch off Below 1 V
      Ignition switch ON 4.75 to 5.25 V
      A67-17 (RHT) - Body ground W - 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
      A67-18 (LHT) - Body ground R - 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
      A67-19 (SHRL) - Body ground P - Body ground Rear height control sensor sub-assembly signal input Ignition switch off Below 1 V
      Ignition switch ON 0.5 to 4.5 V

      If the result is not as specified, the headlight leveling ECU assembly may be malfunctioning.