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METER / GAUGE SYSTEM Operating Light Control Rheostat does not Change Light Brightness

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DTC Code DTC Name
  Operating Light Control Rheostat does not Change Light Brightness
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DESCRIPTION

The combination meter assembly receives signals from this circuit to adjust the illumination of the combination meter assembly. The combination meter assembly sets the illumination level based on the user operation of the light control rheostat switch in the trip switch.

Tip:

  • The meter illumination level can be adjusted by pressing the light control rheostat switch.


  • The meter illumination dims when the headlight dimmer switch assembly is turned to the tail or head position at night.


  • Setting the meter illumination to maximum brightness cancels the above dimming of the meter illumination.

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WIRING DIAGRAM

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PROCEDURE


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    READ VALUE USING GTS (LIGHT CONTROL UP SWITCH, LIGHT CONTROL DOWN SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Combination Meter / Data List.

    5. Check the values by referring to the table below.

      Table 1. Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Light Control Up Switch Light control rheostat up switch/OFF or ON OFF: Light control rheostat up switch not pressed -
      ON: Light control rheostat up switch pressed
      Light Control Down Switch Light control rheostat down switch/OFF or ON OFF: Light control rheostat down switch not pressed -
      ON: Light control rheostat down switch pressed
      OK
      The value displayed on the GTS changes with the actual light control rheostat switch operation.

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    INSPECT TRIP SWITCH


    1. A0006VNE08

      Remove the trip switch (Click here).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (IG) - 5 (E) Light control rheostat up switch pressed Below 1 Ω
      Light control rheostat up switch not pressed 10 kΩ or higher
      Light control rheostat down switch pressed Below 1 Ω
      Light control rheostat down switch not pressed 10 kΩ or higher
      Table 2. Text in Illustration
      *a

      Component without harness connected

      (Trip Switch)

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    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - TRIP SWITCH)


    1. Disconnect the H14 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H14-24 (TR) - H64-3 (IG) Always Below 1 Ω
      H14-24 (TR) - Body ground Always 10 kΩ or higher
      H64-5 (E) - Body ground Always Below 1 Ω

    • OK

      REPLACE COMBINATION METER ASSEMBLY (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR