METER / GAUGE SYSTEM Meter Illumination is Always Dark

DESCRIPTION

The combination meter assembly receives signals from this circuit to adjust the illumination of the meter. The combination meter assembly sets the illumination level based on the user operation of the light control rheostat.

Tech Tips


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

  • The meter illumination dims when the light control switch is turned to the tail, head, or AUTO position at night.

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

WIRING DIAGRAM

A0041UAE79

INSPECTION PROCEDURE

Tech Tips

Before starting the following inspection, check if the lighting system outputs DTCs 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.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Illumination Rate Info Illumination rate information/0 ms. to 2162.65 ms. Value is output according to ambient light levels Value changes according to ambient light levels
      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 NO. 3 METER CIRCUIT PLATE


    1. Replace the No. 3 meter circuit plate with a new or known good one Click here.

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

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    OK

    END