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 switch.

WIRING DIAGRAM

B000K7SE73

INSPECTION PROCEDURE

Tech Tips


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

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

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

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication DTC is output Click here.

      Result
      Result Proceed to
      CAN communication DTC is not output. A
      CAN communication DTC is 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 ignition switch ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Data List.

    5. Read the Data List according to the display on the GTS.

      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 -
      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 LIGHTING SETTING 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 Click here.

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

      Tech Tips

      The combination meter assembly controls the meter illumination based on an auto dimmer signal from the main body ECU (multiplex network body ECU). When the meter illumination is always dark (very dim), it may be due to the main body ECU (multiplex network body ECU) sending an auto dimmer signal to the meter ECU because of a malfunction in the main body ECU (multiplex network body ECU).


    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

    END