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Operating Light Control Rheostat does not Change Light Brightness: Procedure

  1. SYSTEM CHECK 

    Result

    Result Proceed to
    Meter illumination does not change when operate the light control rheostat knob A
    Dimmer cancel does not operate B

    B → See step   7 

    A: Go to next step 

  2. READ VALUE USING TECHSTREAM (RHEOSTAT VALUE) 
    1. Connect Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the tester ON.
    4. Enter the following menus: Body Electrical / Combination Meter / Active Test.
    5. Check the values by referring to the table below.
      COMBINATION METER:

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Rheostat value Light control rheostat/Min.: 0%, Max.: 100% Light control rheostat switch is Dark (0%) → Bright (100%) -

      OK

      The value displayed on the tester gradually changes as the actual rheostat operation.

    NG → See step   4 

    OK: Go to next step 

  3. READ VALUE USING TECHSTREAM (TAIL CANCEL SW) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the tester ON.
    4. Enter the following menus: Body Electrical / Combination Meter / Data List.
    5. Check the values by referring to the table below.
      COMBINATION METER:

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Tail Cancel SW Tail cancel switch is OFF/ON OFF: Light control rheostat position is except below -
      ON: Turn the Light control rheostat knob fully upwards -

      OK

      Condition displayed on the tester is the same as the actual rheostat position.

    NG → See step   7 

    OK → REPLACE COMBINATION METER ASSEMBLY 

  4. INSPECT LIGHT CONTROL RHEOSTAT 
    1. Remove the light control rheostat with the connector still connected.
      Fig 1: Identifying Light Control Rheostat Connector Terminals
      GTY133866Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      E (J15-1) - RV (J15-4) Turn the rheostat knob fully clockwise 8 to 12 kΩ
      E (J15-1) - RV (J15-4) Rheostat knob is between MIN. and MAX. The value changes gradually
      (Between approx. 0 to 8 kΩ)
      E (J15-1) - RV (J15-4) Turn the rheostat knob fully counterclockwise Approx. 0 Ω

    NG → REPLACE LIGHT CONTROL RHEOSTAT 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL RHEOSTAT) 
    1. Disconnect the J34 and J15 connectors.
      Fig 2: Identifying J34 And J15 Connector Terminals
      GTY140342Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      J34-14 (ET) - J15-1 (E) Always Below 1 Ω
      J34-9 (ILL+) - J15-3 (T) Always Below 1 Ω
      J34-21 (TR) - J15-4 (RV) Always Below 1 Ω
      J15-1 (E) - Body ground Always 10 kΩ or higher
      J15-3 (T) - Body ground Always 10 kΩ or higher
      J15-4 (RV) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE COMBINATION METER ASSEMBLY 

  6. READ VALUE USING TECHSTREAM (TAIL CANCEL SW) 
    1. Connect Techstream to the DLC3.
    2. Engine switch on (IG).
    3. Turn the tester ON.
    4. Enter the following menus: Body Electrical / Combination Meter / Data List.
    5. Check the values by referring to the table below.
      COMBINATION METER:

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Tail Cancel SW Tail cancel switch is ON/OFF ON: Light control rheostat turns fully clockwise
      OFF: Light control rheostat position is except above.      		 -

      OK

      Rheostat position displayed on the tester is same as the actual rheostat position.

    NG → See step   7 

    OK → REPLACE COMBINATION METER ASSEMBLY 

  7. INSPECT LIGHT CONTROL RHEOSTAT 
    1. Remove the light control rheostat with connector still connected.
      Fig 3: Identifying Light Control Rheostat Connector Terminal
      GTY151390Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      TC (J15-2) - T (J15-3) Turn the rheostat knob fully counterclockwise Below 1 Ω
      TC (J15-2) - T (J15-3) Turn the rheostat knob fully clockwise 10 kΩ or higher

    NG → REPLACE LIGHT CONTROL RHEOSTAT 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL RHEOSTAT) 
    1. Disconnect the J34 and J15 connectors.
      Fig 4: Identifying J34 And J15 Connector Terminals
      GTY140341Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      J34-8 (TC) - J15-2 (TC) Always Below 1 Ω
      J15-2 (TC) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE COMBINATION METER ASSEMBLY 

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