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

DESCRIPTION

The meter CPU receives signals from this circuit to adjust the illumination of the meter. The meter CPU sets the illumination level based on the user operation of the light control rheostat up or down switches.

Tech Tips


  • The meter illumination level can be adjusted by pressing the light control rheostat up or down switches.

  • 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

A01FR4YE02

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING GTS (RHEOSTAT SWITCH)


    1. Use the Data List to check the rheostat switch Click here.

      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 in accordance with the actual rheostat switch operation.

    NG

    INSPECT TRIP SWITCH Click here

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

  2. INSPECT TRIP SWITCH


    1. Remove the trip switch Click here.

    2. Inspect the trip switch Click here.


    NG

    REPLACE TRIP SWITCH Click here

    OK

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


    1. Disconnect the N40 combination meter assembly connector.

    2. Disconnect the N8 trip switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N40-24 (TR) - N8-3 (IG) Always Below 1 Ω
      N8-5 (E) - Body ground
      N40-24 (TR) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here