METER / GAUGE SYSTEM Meter Illumination does not Dim at Night

DTC Code DTC Name
Meter Illumination does not Dim at Night

DESCRIPTION

In this circuit, the meter CPU receives auto dimmer signals from the main body ECU (multiplex network body ECU) using the CAN communication system (CAN No. 1 Bus). When the meter CPU receives an auto dimmer signal, it dims the meter illumination (warning and indicator lights). The main body ECU (multiplex network body ECU) determines whether it is daytime, twilight, or nighttime based on the waveform transmitted from the automatic light control sensor. If the main body ECU (multiplex network body ECU) determines that it is nighttime and the light control switch is in the tail, head, or AUTO position, the ECU sends an auto dimmer signal. According to the signal, the combination meter assembly dims the meter illumination.

Tip:

When the meter illumination does not dim at night, there may be a malfunction in the automatic light control sensor, main body ECU (multiplex network body ECU), CAN communication system, harness, connector or combination meter assembly.

WIRING DIAGRAM

E206054E01

CAUTION / NOTICE / HINT

Tip:

  • Setting the meter illumination to maximum brightness prevents the meter illumination from dimming when the light control switch is changed to the tail or head position, or changed to the AUTO position at night. Therefore, check the meter illumination setting before proceeding to the following steps.

PROCEDURE

  1. CHECK CAN COMMUNICATION SYSTEM

    1. Check if a CAN communication DTC is output.

      Click hereClick 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. CHECK DTC (LIGHT CONTROL SENSOR CIRCUIT)

    1. Check if DTC B1244 is output.

      Click here

      Body Electrical > Combination Meter > Trouble Codes

      Chassis > ABS/VSC/TRC > Trouble Codes

      Powertrain > Engine and ECT > Trouble Codes

      Body Electrical > D-SEAT SW > Trouble Codes

      Result

      Result

      Proceed to

      DTC B1244 is not output

      A

      DTC B1244 is output

      B
    B

    GO TO LIGHTING SYSTEM

    Click here

    A

  3. CHECK OPERATION (HEATER CONTROL PANEL)

    1. Turn the engine switch on (IG).

    2. Turn the light control switch to the tail, head, or AUTO position.

    3. Cover the light control switch.

    4. Check the heater control panel illumination

      Result

      Result

      Proceed to

      Heater control panel illumination does not operate normally

      A

      Heater control panel illumination operates normally

      B
      Tip:

      Both the heater control panel and combination meter assembly illumination dim according to the dimmer signal. Therefore, when only the meter illumination does not dim at night, replace the combination meter assembly.

    B

    REPLACE COMBINATION METER ASSEMBLY

    Click here

    A

  4. CHECK OPERATION (AUTOMATIC LIGHT CONTROL SYSTEM)

    1. Turn the engine switch on (IG).

    2. Turn the light control switch to the AUTO position.

    3. Cover the automatic light control sensor.

    4. Check the taillights and low beam headlights

      OK

      The taillights and low beam headlights come on.

    5. Uncover the automatic light control sensor.

    6. Check the low beam headlights and taillights.

      OK

      The taillights and low beam headlights go off.

      Result

      Result

      Proceed to

      Automatic light control system operates normally

      A

      Automatic light control system does not operate normally

      B
    B

    CHECK LIGHTING SYSTEM

    Click hereClick here

    A

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

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

      Click here

    2. Check the operation of the combination meter assembly.

      OK

      The operation of the combination meter assembly returns to normal.

      Tip:

      The meter CPU controls the meter illumination based on an auto dimmer signal from the main body ECU (multiplex network body ECU). If the meter does not dim when the light control switch is in the tail, head, or AUTO position at night, it may be for either of 2 reasons. The first reason is that the main body ECU (multiplex network body ECU) does not send an auto dimmer signal. The second is that the meter CPU does not dim the meter illumination even though the meter CPU receives an auto dimmer signal.

      Result

      Result

      OK

      NG
    OK

    END

    NG

    REPLACE COMBINATION METER ASSEMBLY

    Click here