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 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.

WIRING DIAGRAM

A00207KE01

CAUTION / NOTICE / HINT

Tech Tips


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


  • The meter illumination dims when the taillights are turned on.


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

PROCEDURE


  1. 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 table below.


      Body Electrical > Combination Meter > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Light Control Up Switch Light control rheostat up switch OFF or ON

      OFF: Switch released

      ON: Switch pressed

      		 -
      Light Control Down Switch Light control rheostat down switch OFF or ON

      OFF: Switch released

      ON: Switch pressed

      		 -

      Body Electrical > Combination Meter > Data List
      Tester Display
      Light Control Up Switch
      Light Control Down Switch
      OK
      Light control rheostat up or down switch condition displayed on the GTS changes with the actual switch operation.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

  2. INSPECT TRIP SWITCH


    1. Remove the trip switch.

      Click here

    2. Inspect the trip switch.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TRIP SWITCH Click here

    OK

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


    1. Disconnect the K3 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K3-25 (TR) - K90-2 (RV) Always Below 1 Ω
      K3-26 (SW3) - K90-5 (E) Always Below 1 Ω
      K3-25 (TR) - Body ground Always 10 kΩ or higher
      K3-26 (SW3) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR