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

DESCRIPTION

The combination meter assembly (meter circuit plate) receives signals from this circuit to adjust the illumination of the combination meter assembly (meter circuit plate). The combination meter assembly (meter circuit plate) sets the illumination level based on the operation of the light control rheostat up or down switch in the combination switch assembly.

WIRING DIAGRAM

A003OQ0E02
*1 Light Control Rheostat Up Switch
*2 Light Control Rheostat Down Switch
*3 Combination Switch Assembly
*4 Combination Meter Assembly (Meter Circuit Plate)

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 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 level to maximum brightness cancels the above dimming of the meter illumination.

PROCEDURE


  1. READ VALUE USING GTS (LIGHT CONTROL UP SWITCH AND 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. 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 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 (METER CIRCUIT PLATE) Click here

    NG

  2. INSPECT COMBINATION SWITCH ASSEMBLY


    1. Remove the combination switch assembly.

      Click here

    2. Inspect the combination switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMBINATION SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - COMBINATION METER ASSEMBLY (METER CIRCUIT PLATE) AND BODY GROUND)


    1. Disconnect the I6 combination meter assembly (meter circuit plate) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I12-8 (RV) - I6-24 (TR) Always Below 1 Ω
      I12-8 (RV) or I6-24 (TR) - Body ground Always 10 kΩ or higher
      I12-6 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER ASSEMBLY (METER CIRCUIT PLATE) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR