METER / GAUGE SYSTEM Meter Illumination does not Dim at Night

DESCRIPTION

If the dimmer switch is turned to TAIL, HEAD or AUTO, the main body ECU sends a TAIL relay signal, panel light illumination signal, panel relay signal, and TAIL cancel OFF signal to the combination meter. Then the meter dims.

Tech Tips

TAIL cancel switch: When the headlights are illuminated and the TAIL cancel switch is turned ON, the meter does not dim.

WIRING DIAGRAM

Figure 1. except 5L-E

B001H9TE02

Figure 2. for 5L-E

B001EY9E01

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication DTC is output.


      1. w/ Central Gatway ECU Click here.

      2. w/o Central Gatway ECU Click here.

        Result
        Result Proceed to
        CAN communication system DTC is not output A
        CAN communication system DTC is output (w/ Central Gatway ECU) B
        CAN communication system DTC is output (w/o Central Gatway ECU) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. READ VALUE USING GTS (TAIL CANCEL SW, RHEOSTAT VALUE)


    1. Using the GTS, read the Data List Click here.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Tail Cancel SW* Tail cancel switch/OFF or ON OFF: Tail cancel switch off -
      ON: Tail cancel switch on
      Rheostat value Light control rheostat switch input/Min.: 0, Max.: 100 Light control rheostat switch is fully turned right (0) → fully turned left (100) Unit: %

      • *: w/ TAIL Cancel Switch

      OK
      Light brightness can be changed within specified range by manual operation.

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

  3. INSPECT TRIP SWITCH (LIGHT CONTROL RHEOSTAT)


    1. Remove the trip switch. (light control rheostat) Click here

    2. Inspect the trip switch. (light control rheostat) Click here


    NG

    REPLACE TRIP SWITCH (LIGHT CONTROL RHEOSTAT) Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - TRIP SWITCH [LIGHT CONTROL RHEOSTAT])


    1. Disconnect the G304*1, G6*2 combination meter assembly connector.


      • *1: except 5L-E

      • *2: for 5L-E

    2. Disconnect the G16 trip switch (light control rheostat) connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (except 5L-E)
      for LHD
      Tester Connection Condition Specified Condition
      G304-35 (TC) - G16-6 (TC)* Always Below 1 Ω
      G304-33 (SW1) - G16-5 (T) Always Below 1 Ω
      G304-34 (SW2) - G16-7 (RV) Always Below 1 Ω
      G304-1 (SW3) - G16-1 (E) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      G304-35 (TC) - G16-7 (TC)* Always Below 1 Ω
      G304-33 (SW1) - G16-8 (T) Always Below 1 Ω
      G304-34 (SW2) - G16-6 (RV) Always Below 1 Ω
      G304-1 (SW3) - G16-4 (E) Always Below 1 Ω

      • *: w/ TAIL Cancel Switch

      Standard Resistance (for 5L-E)
      for LHD
      Tester Connection Condition Specified Condition
      G6-6 (SW1) - G16-5 (T) Always Below 1 Ω
      G6-7 (SW2) - G16-7 (RV) Always Below 1 Ω
      G6-22 (SW3) - G16-1 (E) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      G6-6 (SW1) - G16-8 (T) Always Below 1 Ω
      G6-7 (SW2) - G16-6 (RV) Always Below 1 Ω
      G6-22 (SW3) - G16-4 (E) Always Below 1 Ω

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR