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Home >> Toyota >> 2006 >> Avalon XLS >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter >> Meter / Gauge System >> Operating Light Control Rheostat does not Change Light Brightness >> Inspection Procedure

Inspection Procedure

  1. READ VALUE OF INTELLIGENT TESTER (LIGHT CONTROL RHEOSTAT) 
    1. Operate the intelligent tester according to the steps on the display and select the "DATA LIST".

      METER: 

      METER REFERENCE

      Item Measurement Item / Display (Range) Normal Condition Diagnostic Note
      RHEOSTAT VOL Light control Rheostat / Min.: 0, Max.: 255 Light control rheostat switch is Dark (0) --> Bright (255) -

    OK: 

    Light control can be changed within the specified range by actual operation. 

    NG: Go to step  5

    OK: GO TO NEXT STEP 

  2. CHECK ILLUMINATION 
    RESULT REFERENCE

    Result Proceed to
    All illumination does not change. A
    Only combination meter illumination does not change. A
    Lounge illumination / Push start button illumination does not change. B
    Other illumination (navigation, audio, etc.) does not change. C

    B: Go to step 3 

    C: Go to step  4

    A: REPLACE COMBINATION METER ASSEMBLY 

  3. REPLACE BODY ECU 

    HINT:

    Check illumination circuit before replacing body ECU (See PROBLEM SYMPTOMS TABLE ).

    OK: 

    Operation of the light control rheostat returns to normal. 

    NG: REPLACE COMBINATION METER ASSEMBLY 

    OK: END 

  4. INSPECT COMBINATION METER ASSEMBLY 
    1. Disconnect the E2 connector.
      Fig 1: Disconnecting E2 Connector
      G04379977Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Measure the voltage according to the value(s) in the table below.

      Voltage 

      VOLTAGE REFERENCE

      Tester Connection Condition Specified Condition
      E2-11 (ILL) - Body ground Ignition switch on (IG), and TAIL light ON 10 to 14 V
      E2-11 (ILL) - Body ground Ignition switch off Below 1 V

    NG: REPLACE COMBINATION METER ASSEMBLY 

    OK: CHECK ILLUMINATION 

  5. INSPECT LIGHT CONTROL RHEOSTAT 
    1. Remove the light control rheostat.
      Fig 2: Identifying Light Control Rheostat Connector Terminals
      G04379978Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      RESISTANCE REFERENCE

      Tester Connection Condition Specified Condition
      E1-1 (E) - E1-4 (RV) Rheostat knob fully turns clockwise. 8 to 12 Ω
      E1-1 (E) - E1-4 (RV) Rheostat knob fully turns counterclockwise. Approx. 0 Ω
      E1-2 (TC) - E1-3 (T) Rheostat knob fully turns clockwise. Below 1 Ω
      E1-2 (TC) - E1-3 (T) Rheostat knob fully turns counterclockwise. 10 kΩ or higher

    NG: REPLACE LIGHT CONTROL RHEOSTAT 

    OK: GO TO NEXT STEP 

  6. CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL RHEOSTAT) 
    1. Disconnect the E1 and E2 connectors.
      Fig 3: Disconnecting E1 And E2 Connectors
      G04379979Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      RESISTANCE REFERENCE

      Tester Connection Condition Specified Condition
      E1-1 (E) - Body ground Always 10 kΩ or higher
      E1-2 (TC) - Body ground Always 10 kΩ or higher
      E1-3 (T) - Body ground Always 10 kΩ or higher
      E1-4 (RV) - Body ground Always 10 kΩ or higher
      E1-1 (E) - E2-22 (RE) Always Below 1 Ω
      E1-2 (TC) - E2-19 (TC SW) Always Below 1 Ω
      E1-3 (T) - E2-20 (RT) Always Below 1 Ω
      E1-4 (RV) - E2-21 (RV) Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE COMBINATION METER ASSEMBLY 

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