METER / GAUGE SYSTEM Meter Illumination is Always Dark

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.

Tech Tips


  • The meter illumination dims when the headlight dimmer switch assembly is turned to the tail, head, or AUTO position.

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

WIRING DIAGRAM

A01KTKWE86
*1 Main Body ECU (Multiplex Network Body ECU)
*2 CAN Communication Line
*3 Combination Meter Assembly

CAUTION / NOTICE / HINT

Tech Tips


  • Setting the meter illumination to minimum brightness turns off the meter illumination when the headlight dimmer switch assembly is turned to the tail, head, or AUTO position.

  • Before starting the following inspection, check if lighting system DTCs are output.

    Click here

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication DTCs are output.

      Click here

      Result
      Result Proceed to
      CAN communication DTCs are not output. A
      CAN communication DTCs are output. B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. READ VALUE USING GTS (ILLUMINATION RATE INFO)


    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 / Main Body / Data List.

    5. Check the values by referring to the table below.


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Illumination Rate Info Illumination rate information 0.00 ms. to 2162.65 ms. Value output according to ambient light level -

      Body Electrical > Main Body > Data List
      Tester Display
      Illumination Rate Info
      Result
      Result Proceed to
      The output value changes according to the ambient light level. A
      The output value does not change according to the ambient light level. B

    B

    CHECK CUSTOMIZE PARAMETER SETTING (SENSITIVITY) Click here

    A

  3. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. Replace the main body ECU (multiplex network body ECU) with a new or known good one.

      for LHD: Click here

      for RHD: Click here

      OK
      The operation of the combination meter assembly returns to normal.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here