AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM TERMINALS OF ECU


  1. CHECK HEADLIGHT LEVELING ECU (HEADLIGHT SWIVEL ECU ASSEMBLY)

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    1. Disconnect the A80 headlight leveling ECU (headlight swivel ECU assembly) connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A80-14 (IGS) - Body ground V - Body ground Headlight swivel motor RH and LH (leveling function) power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A80-15 (IG) - Body ground LG - Body ground IG power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A80-22 (E1) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the A80 headlight leveling ECU (headlight swivel ECU assembly) connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A80-1 (SMBL) - A80-22 (E1) SB - W-B Headlight swivel motor LH (leveling function) power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A80-2 (SMBR) - A80-22 (E1) W - W-B Headlight swivel motor RH (leveling function) power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A80-11 (RH+) - A80-22 (E1) P - W-B Headlight swivel motor RH (leveling function) LIN communication Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A80-12 (CANH) - A80-22 (E1) B - W-B CAN communication Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A80-13 (CANL) - A80-22 (E1) W - W-B CAN communication Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A80-18 (SBR) - A80-21 (SGR) B - G Rear height control sensor sub-assembly power supply Engine switch off Below 1 V
      Engine switch on (IG) 4.7 to 5.2 V
      A80-19 (SHRL) - A80-21 (SGR) L - G Rear height control sensor sub-assembly signal Engine switch off Below 1 V
      Engine switch on (IG) 0.5 to 4.5 V
      A80-21 (SGR) - A80-22 (E1) G - W-B Rear height control sensor sub-assembly ground Always Below 1 Ω
      A80-27 (SMGL) - A80-22 (E1) GR - W-B Headlight swivel motor LH (leveling function) ground Always Below 1 Ω
      A80-28 (SMGR) - A80-22 (E1) B - W-B Headlight swivel motor RH (leveling function) ground Always Below 1 Ω
      A80-30 (LH+) - A80-22 (E1) G - W-B Headlight swivel motor LH (leveling function) LIN communication Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation

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