FixVault
Home › Lexus › 2003 › LS 430 › Repair and Diagnosis › Accessories & Equipment › Exterior Lights › Headlight Beam Level Control System › Inspection

Headlight Beam Level Control System: Inspection

  1. INSPECT HEADLIGHT BEAM LEVEL CONTROL ACTUATOR RESISTANCE 
    1. Check that continuity exists between terminal 2 and 5.
    2. Check that resistance exists between terminal, as shown in the chart.
      TERMINAL RESISTANCE

      Terminal Resistance Ω
      2 - 1 26 - 30
      2 - 3 26 - 30
      2 - 4 26 - 30
      2 - 6 26 - 30
      5 - 1 26 - 30
      5 - 3 26 - 30
      5 - 4 26 - 30
      5 - 6 26 - 30

      If resistance value is not as specified, replace the actuator.

      Fig 1: Identifying Headlight Beam Level Control Actuator Terminals
      G03376866Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Connector disconnected: INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU CIRCUIT 

    Disconnect the connector from the ECU and inspect the connector on the wire harness side, as shown.

    Fig 2: Identifying Headlight Beam Level Control ECU Terminals (Wire Harness Side)
    G03376867Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CONNECTOR SPECIFIED CONDITION

    Tester connection Condition Specified condition
    1 - 4 Ignition switch OFF 26 - 30 Ω
    1 - 5 Ignition switch OFF 26 - 30 Ω
    1 - 6 Ignition switch OFF 26 - 30 Ω
    1 - 7 Ignition switch OFF 26 - 30 Ω
    1 - 17 Ignition switch OFF 26 - 30 Ω
    1 - 18 Ignition switch OFF 26 - 30 Ω
    1 - 19 Ignition switch OFF 26 - 30 Ω
    1 - 20 Ignition switch OFF 26 - 30 Ω
    10 - 25 Ignition switch OFF Continuity
    21 - 25 Ignition switch OFF Continuity
    24 - 25 Ignition switch OFF Continuity
    13 - Ground Ignition switch OFF Continuity
    26 - Ground Ignition switch OFF Continuity

    If circuit is not as specified, perform the inspection in the following steps.

  3. Connector connected: INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU CIRCUIT 

    Connect the connector from the ECU and inspect the connector on the back side, as shown in the chart.

    Fig 3: Identifying Headlight Beam Level Control ECU Terminals (Connector Connected)
    G03376868Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CONNECTOR SPECIFIED CONDITION

    Tester connection Condition Specified condition
    1 - 13 Ignition switch ON Battery positive voltage
    4 - 13, 26 Ignition switch ON, when keep and bounce the vehicle Pulse generation
    5 - 13, 26 Ignition switch ON, when keep and bounce the vehicle Pulse generation
    6 - 13, 26 Ignition switch ON, when keep and bounce the vehicle Pulse generation
    7 - 13, 26 Ignition switch ON, when keep and bounce the vehicle Pulse generation
    10 - 25 Ignition switch ON Approx. 2.5 V
    12 - 13 Ignition switch ON No continuity
    26 - Body ground Ignition switch OFF Continuity (w/ Electrical modulated air suspension)
    13 - 15 Ignition switch ON and light control switch HEAD Below 1.5 V
    17 - 13, 26 Ignition switch ON, when keep and bounce the vehicle Pulse generation
    18 - 13, 26 Ignition switch ON, when keep and bounce the vehicle Pulse generation
    19 - 13, 26 Ignition switch ON, when keep and bounce the vehicle Pulse generation
    20 - 13, 26 Ignition switch ON, when keep and bounce the vehicle Pulse generation
    21 - 25 Ignition switch ON Approx. 2.5 V
    24 - 25 Ignition switch ON 5 V
    13 - 25 Ignition switch OFF Continuity
    13 - Body ground Ignition switch OFF Continuity

    If the circuit is not as specified, replace the ECU.

About FixVault