METER / GAUGE SYSTEM Meter Illumination does not Dim at Night

DESCRIPTION

w/ Multi-information Display:

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 switch off signal to the combination meter. Then the meter and accessory meter become dim.

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

A01XBXYE01

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      CAN communication system DTC is not output A
      CAN communication system (for LHD with Central Gateway ECU) DTC is output B
      CAN communication system (for LHD without Central Gateway ECU) DTC is output C
      CAN communication system (for RHD with Central Gateway ECU) DTC is output D
      CAN communication system (for RHD without Central Gateway ECU) DTC is output D

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    D

    GO TO CAN COMMUNICATION SYSTEM Click here

    E

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. READ VALUE USING GTS (LIGHT CONTROL RHEOSTAT)


    1. Operate the GTS according to the display and select Data List Click here.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Tail Cancel SW* TAIL cancel switch condition/ON or OFF

      ON: TAIL cancel switch ON

      OFF: TAIL cancel switch OFF

      		 -
      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: %

      Tech Tips

      *: 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 LIGHT CONTROL RHEOSTAT


    1. Inspect the light control rheostat.

      A01WZT4E04

      1. Remove the light control rheostat Click here.

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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        6 (TC) - 1 (E) TAIL cancel switch off → on 10 kΩ or higher → Below 1 Ω
        5 (T) - 1 (E) Always 10 kΩ or higher
        7 (TR) - 1 (E) Light control rheostat fully turned right → fully turned left 10 kΩ or higher → Below 100 Ω

    2. Inspect the trip switch.


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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        4 (A/B) - 1 (E) TRIP switch on (Pushed) Below 200 Ω
        TRIP switch off (Not Pushed) 1 MΩ or higher

    NG

    REPLACE LIGHT CONTROL RHEOSTAT Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL RHEOSTAT)


    1. Disconnect the E119 meter connector.

    2. Disconnect the E9 rheostat connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E119-30 (ILL+) - E9-5 (T) Always Below 1 Ω
      E119-31 (TR) - E9-7 (TR)
      E119-19 (E2) - E9-1 (E)
      E119-32 (TC) - E9-6 (TC)

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR