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METER / GAUGE SYSTEM Meter Illumination is Always Dark

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DTC Code DTC Name
  Meter Illumination is Always Dark
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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 in the trip switch.

Tip:

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

  • 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.

Table 1. *1 Main body ECU (Multiplex Network Body ECU) *2 Combination Meter Assembly *3 CAN Communication Line
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

Tip:

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

  • Setting the meter illumination to minimum brightness (very dim) 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).

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PROCEDURE


  1. Click here

    CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication DTCs are output (See page w/ Central Gateway ECU,Click herew/o Central Gateway ECU).

      Result
      Result Proceed to
      CAN communication DTCs are not output. A
      CAN communication DTCs are output (w/ Central Gateway ECU). B
      CAN communication DTCs are output (w/o Central Gateway ECU). C

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

      Table 2. Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Illumination Rate Info Illumination rate information/0.00 ms. to 2162.65 ms. Value is output according to ambient light level -
      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

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    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.

    • OK

      END

    • NG

      REPLACE COMBINATION METER ASSEMBLY (Click here)