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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.
    CHECKING TERMINALS 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
    G02946716Courtesy 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 Connector Terminals
    G02946717Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER POSITION SPECIFIED CONDITION

    Tester connection Condition Specified condition
    1-13 Ignition switch OFF 26-30 Ω
    1-15 Ignition switch OFF 26-30 Ω
    1-14 Ignition switch OFF 26-30 Ω
    1-16 Ignition switch OFF 26-30 Ω
    1-4 Ignition switch OFF 26-30 Ω
    1-2 Ignition switch OFF 26-30 Ω
    1-12 Ignition switch OFF 26-30 Ω
    1-3 Ignition switch OFF 26-30 Ω
    6-10 Ignition switch OFF Continuity
    7- 11 Ignition switch OFF Continuity
    10-17 Ignition switch OFF Continuity
    5-11 Ignition switch OFF Continuity
    20 - Ground Ignition switch OFF Continuity

    If circuit is not as specified, perform the inspection on the following page.

  3. Connector connected: 
    1. 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 Connector Terminals From Back Side
    G02946718Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION

    Tester connection Condition Specified condition
    1-20 Ignition switch ON Battery positive voltage
    13-20 Ignition switch ON, when keep and bounce the vehicle *1 Pulse generation
    15-20 Ignition switch ON, when keep and bounce the vehicle *1 Pulse generation
    14- 20 Ignition switch ON, when keep and bounce the vehicle *1 Pulse generation
    16-20 Ignition switch ON, when keep and bounce the vehicle *1 Pulse generation
    10-17 Ignition switch ON Approx. 2.5 V
    18-20 Ignition switch ON No continuity
    4-20 Ignition switch ON, when keep and bounce the vehicle *1 Pulse generation
    2-20 Ignition switch ON, when keep and bounce the vehicle *1 Pulse generation
    12-20 Ignition switch ON, when keep and bounce the vehicle *1 Pulse generation
    3-20 Ignition switch ON, when keep and bounce the vehicle *1 Pulse generation
    5-11 Ignition switch ON Approx. 2.5 V
    11-20 Ignition switch OFF Continuity
    10-17 Ignition switch OFF Continuity
    6-10 Ignition switch ON 5V
    7-11 Ignition switch ON 5V
    10-20 Ignition switch OFF Continuity
    20 - Body ground Ignition switch OFF Continuity

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

    Reference: INSPECTION USING OSCILLOSCOPE 

    HINT:

    The correct waveform is as shown in the illustration.

    Fig 4: Identifying Correct Waveform
    G02946719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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