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Headlight Beam Level Control System: Inspection

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

    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: Inspecting Headlight Beam Level Control Actuator Resistance
    G03471044Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT FRONT HEIGHT CONTROL SENSOR 
    1. Connect 3 dry batteries of 1.5 V in series.
    2. Connect terminal 1 to the batteries' positive (+) terminal, and terminal 4 to the batteries' negative (-) terminal, then apply voltage about 4.5 V between terminals 1 and 4.
    3. Measure the voltage between terminals 2 and 4, when the height control sensor link is slowly moved up and down.
    VOLTAGE SPECIFICATION

    Sensor Link Position Voltage
    Max. HI Approx. 4.05 V
    N Approx. 2.25 V
    Min. LO Approx. 0.45 V

    If voltage is not as specified, replace the height control sensor.

    Fig 2: Measuring Voltage Between Terminals 2 And 4
    G03471045Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT REAR HEIGHT CONTROL SENSOR 
    1. Connect 3 dry batteries of 1.5 V in series.
    2. Connect terminal 3 to the batteries' positive (+) terminal, and terminal 1 to the batteries' negative (-) terminal, then apply voltage about 4.5 V between terminals 1 and 3.
    3. Measure the voltage between terminals 1 and 2, when the height control sensor link is slowly moved up and down.
    VOLTAGE SPECIFICATION

    Sensor Link Position Voltage
    Max. HI Approx. 4.05 V
    N Approx. 2.25 V
    Min. LO Approx. 0.45 V

    If voltage is not as specified, replace the height control sensor.

    Fig 3: Measuring Voltage Between Terminals 1 And 2
    G03471046Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. 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 4: Inspecting Connector On Wire Harness Side
    G03471047Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFICATION

    Tester connection Condition Specified condition
    A1 - A5 Ignition switch OFF 26 - 30 Ω
    A1 - A6 Ignition switch OFF 26 - 30 Ω
    A1 -A7 Ignition switch OFF 26 - 30 Ω
    A1 -A8 Ignition switch OFF 26 - 30 Ω
    A4 - B4 Ignition switch ON and light control switch HEAD Below 1.5 V
    B1 - B3 Ignition switch OFF 3.5 - 6.5 kΩ
    B5-B7 Ignition switch OFF 3.5 - 6.5 kΩ
    A4 - Ground Ignition switch OFF Continuity

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

  5. Connector connected: 

    INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU CIRCUIT 

    Connect the connector from the ECU and inspect the connector, as shown in the table.

    Fig 5: Inspecting Connector
    G03471048Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFICATION

    Tester connection Condition Specified condition
    A1 - A4 Ignition switch ON Battery positive voltage
    A1 - A5 Ignition switch ON, when stopping and bouncing the vehicle. Pulse generation
    A1 - A6 Ignition switch ON, when stopping and bouncing the vehicle. Pulse generation
    A1 - A7 Ignition switch ON, when stopping and bouncing the vehicle. Pulse generation
    A1 - A8 Ignition switch ON, when stopping and bouncing the vehicle. Pulse generation
    B2 - B3 Ignition switch ON Approx. 2.5 V
    B6 - B7 Ignition switch ON Approx. 2.5 V
    B1 - B3 B5 - B7 Ignition switch ON 5 V

    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 6: Identifying Correct Waveform
    G03471049Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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