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

DESCRIPTION

The combination meter assembly receives signals through 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

B0086D5E03

CAUTION / NOTICE / HINT

Note

When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

Tech Tips


  • The illumination level of the combination meter assembly can be adjusted by pressing the light control rheostat switch (trip switch).


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


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

PROCEDURE


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


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    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.


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

      OFF: Switch released

      ON: Switch pushed

      		 -
      Light Control Switch (DOWN) Light control rheostat down switch (Trip switch) OFF or ON

      OFF: Switch released

      ON: Switch pushed

      		 -

      Body Electrical > Combination Meter > Data List
      Tester Display
      Light Control Switch (UP)
      Light Control Switch (DOWN)
      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 (TRIP SWITCH - COMBINATION METER ASSEMBLY)


    1. Disconnect the K20 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K111-4 (RV) - K20-2 (TR) Always Below 1 Ω
      K111-1 (E) - K20-5 (SW3) Always Below 1 Ω
      K111-4 (RV) or K20-2 (TR) - 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