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

DESCRIPTION

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

Tech Tips


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


  • The meter illumination dims when the light control switch 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.

WIRING DIAGRAM

A01W3QDE01

PROCEDURE


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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Read the Data List according to the display on the GTS.

      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.

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

  2. INSPECT TRIP SWITCH


    1. A01W4Y8E08
      Text in Illustration
      *a

      Component without harness connected

      (Trip Switch)

      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

    NG

    REPLACE TRIP SWITCH Click here

    OK

  3. 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
      H14-25 (TR) - H64-3 (IG) Always Below 1 Ω
      H14-26 (SW3) - H64-5 (E) Always Below 1 Ω
      H14-25 (TR) - Body ground Always 10 kΩ or higher
      H14-26 (SW3) - Body ground Always 10 kΩ or higher

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR