AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM TERMINALS OF ECU

  1. CHECK HEADLIGHT SWIVEL ECU ASSEMBLY

    E261582N02

    1. Disconnect the A93 headlight swivel ECU assembly connector.

    2. Measure the 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

      A93-22 (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. Measure the voltage 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

      A93-14 (IGS) - Body ground

      V - Body ground

      Headlight leveling motor RH and LH power supply

      Ignition switch off

      Below 1 V

      Ignition switch ON

      11 to 14 V

      A93-15 (IG) - Body ground

      L - 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 in the wire harness.

    4. Reconnect the A93 headlight swivel ECU assembly connector.

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

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      A93-21 (SGF) - A93-22 (E1)

      L - W-B

      Rear height control sensor sub-assembly ground

      Always

      Below 1 Ω

      A93-27 (LL1-) - A93-22 (E1)

      SB - W-B

      Headlight leveling motor LH ground

      Always

      Below 1 Ω

      A93-28 (LR1-) - A93-22 (E1)

      B - W-B

      Headlight leveling motor RH ground

      Always

      Below 1 Ω

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

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

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      A93-1 (SMBL) - A93-22 (E1)

      W - W-B

      Headlight leveling motor LH power supply

      Ignition switch off

      Below 1 V

      Ignition switch ON

      11 to 14 V

      A93-2 (SMBR) - A93-22 (E1)

      Y - W-B

      Headlight leveling motor RH power supply

      Ignition switch off

      Below 1 V

      Ignition switch ON

      11 to 14 V

      A93-11 (RHT) - A93-22 (E1)

      W - W-B

      Headlight leveling motor RH LIN communication

      Ignition switch off

      Below 1 V

      Ignition switch ON

      Pulse generation

      A93-12 (CANH) - A93-22 (E1)

      Y - W-B

      CAN communication

      Ignition switch off

      Below 1 V

      Ignition switch ON

      Pulse generation

      A93-13 (CANL) - A93-22 (E1)

      W - W-B

      CAN communication

      Ignition switch off

      Below 1 V

      Ignition switch ON

      Pulse generation

      A93-18 (B) - A93-21 (SGF)

      SB - L

      Rear height control sensor sub-assembly power supply

      Ignition switch off

      Below 1 V

      Ignition switch ON

      4.7 to 5.2 V

      A93-19 (SHRL) - A93-21 (SGF)

      GR - L

      Rear height control sensor sub-assembly signal

      Ignition switch off

      Below 1 V

      Ignition switch ON

      0.5 to 4.5 V

      A93-30 (LHT) - A93-22 (E1)

      LG - W-B

      Headlight leveling motor LH LIN communication

      Ignition switch off

      Below 1 V

      Ignition switch ON

      Pulse generation

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