METER / GAUGE SYSTEM Meter Illumination is Always Dark

DESCRIPTION

In this circuit, the combination meter assembly receives auto dimmer signals from the main body ECU using CAN communication lines. When the combination meter assembly receives an auto dimmer signal, it dims the meter illumination. The main 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 determines that it is daytime, the ECU does not send auto dimmer signals. Therefore, the meter illumination (warning and indicator lights) will not dim even if the driver accidentally turns the light control switch to the tail or head position in the daytime.

Tech Tips

When the meter illumination does not dim at night, the light control rheostat is fully turned to the right (TAIL cancel switch is on, or there may be a malfunction in the automatic light control sensor, main body ECU, CAN communication system, wire harness or connector, or combination meter.

WIRING DIAGRAM

A01ERRXE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC is not output A
      CAN communication system (for LHD) DTC is output B
      CAN communication system (for RHD) DTC is output C
      Lighting system DTC (B1244) is output D

    B

    Go to CAN COMMUNICATION SYSTEM Click here

    C

    Go to CAN COMMUNICATION SYSTEM Click here

    D

    Go to LIGHTING SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DIMMER SWITCH)


    1. Operate the intelligent tester according to the display and select the Active Test Click here.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Dimmer Signal Illumination dimming operation ON or OFF -
      OK
      Meter illumination is dimmed when the dimmer switch is on and the Active Test "Dimmer Signal" is ON.

      Tech Tips

      Refer to the sensitivity setting in the customization table of the automatic light control system Click here.


    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

    CHECK LIGHTING SETTING Click here

  3. REPLACE COMBINATION METER ASSEMBLY


    1. Temporarily replace the combination meter with a new one Click here.


    NEXT

  4. CHECK COMBINATION METER ASSEMBLY


    1. Check that the operation of the combination meter returns to normal.

    2. Perform an operation inspection.

      OK
      Operation of combination meter returns to normal.

    NG

    REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

    OK

    END (COMBINATION METER IS DEFECTIVE)