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Operating Light Control Rheostat does not Change Light Brightness [08/2014 - ]: Procedure

  1. SYSTEM CHECK 
    1. Confirm the symptoms.

      Result

      Result Proceed to
      Meter illumination does not change in operating the light control rheostat. A
      Dimmer function cannot be canceled. B

    Result:  B

    B 

    See step  6

    Result:  A

    A 

    See step  2

  2. READ VALUE USING TECHSTREAM (RHEOSTAT VALUE) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream 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
      Rheostat value Light control rheostat value/Min.: 0 (dark), Max.: 255 (bright) The light control rheostat value 0 (dark) -
      The light control rheostat value 255 (bright)

      OK

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

    Result:  NG

    NG 

    See step  4

    Result:  OK

    OK 

    See step  3

  3. READ VALUE USING TECHSTREAM (TAIL CANCEL SW) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream 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/OFF or ON OFF: Tail cancel switch off -
      ON: Tail cancel switch on -

      HINT: 

      The tail cancel switch is operated by turning the light control rheostat knob fully upward

      OK

      Condition displayed on the Techstream is the same as the actual light control rheostat knob position.

    Result:  OK

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    (See article. Refer to REMOVAL [08/2014 - ] )

    Result:  NG

    NG 

    See step  7

  4. INSPECT LIGHT CONTROL RHEOSTAT 
    1. Remove the light control rheostat (See article. Refer to REMOVAL [08/2014 - ] ).
      GTY350008Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      1 (E) - 3 (RV) Turn the light control rheostat knob fully downwards (MIN.) Below 50 Ω
      Light control rheostat knob position is between MIN. and MAX. The value changes gradually (Between 0 to 12 kΩ)
      Turn the light control rheostat knob fully upwards (MAX.) 8 to 12 kΩ
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Light Control Rheostat)

    Result:  NG

    NG 

    REPLACE LIGHT CONTROL RHEOSTAT 

    (See article. Refer to REMOVAL [08/2014 - ] )

    Result:  OK

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - LIGHT CONTROL RHEOSTAT) 
    1. Disconnect the H19 and H40 connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H19-14 (REV) - H40-3 (RV) Always Below 1 Ω
      H19-14 (REV) - Body ground Always 10 kΩ or higher
      H19-36 (SW3) - H40-1 (E) Always Below 1 Ω
      H19-36 (SW3) - Body ground Always 10 kΩ or higher

    Result:  OK

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    (See article. Refer to REMOVAL [08/2014 - ] )

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. READ VALUE USING TECHSTREAM (TAIL CANCEL SW) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream 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/OFF or ON OFF: Tail cancel switch off -
      ON: Tail cancel switch on -

      HINT: 

      The tail cancel switch is operated by turning the light control rheostat knob fully upward.

      OK

      Condition displayed on the Techstream is the same as the actual light control rheostat knob position.

    Result:  OK

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    (See article. Refer to REMOVAL [08/2014 - ] )

    Result:  NG

    NG 

    See step  7

  7. INSPECT LIGHT CONTROL RHEOSTAT 
    1. Remove the light control rheostat (See article. Refer to REMOVAL [08/2014 - ] ).
      GTY350009Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      5 (TC) - 7 (T) Light control rheostat position is except below Below 50 Ω
      Turn the light control rheostat knob fully upwards (Tail cancel switch is on) 8 to 12 kΩ
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Light Control Rheostat)

    Result:  NG

    NG 

    REPLACE LIGHT CONTROL RHEOSTAT 

    (See article. Refer to REMOVAL [08/2014 - ] )

    Result:  OK

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - LIGHT CONTROL RHEOSTAT) 
    1. Disconnect the H19 and H40 connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H19-16 (SW1) - H40-7 (T) Always Below 1 Ω
      H19-16 (SW1) - Body ground Always 10 kΩ or higher
      H19-15 (TC) - H40-5 (TC) Always Below 1 Ω
      H19-15 (TC) - Body ground Always 10 kΩ or higher

    Result:  OK

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    (See article. Refer to REMOVAL [08/2014 - ] )

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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