LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2009 >> ES 350 >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System (Diagnostic & Circuit Tests) >> Meter / Gauge System >> Operating Light Control Rheostat does not Change Light Brightness >> Procedure

Operating Light Control Rheostat does not Change Light Brightness: Procedure

  1. SYSTEM CHECK 
    1. Turn the engine switch on (IG).
    2. Turn the light control rheostat knob fully upwards.
    3. Turn the light control rheostat knob fully downwards.
    4. Turn the light control rheostat knob fully upwards and light control switch is on TAIL or HEAD.
    5. Check the meter illumination.

      Result

      Result Proceed to
      Meter illumination does not change when operating the light control rheostat knob A
      Dimmer cancel does not operate (Meter illumination does not dim). B

    B → See step   3 

    A: Go to next step 

  2. READ VALUE USING TECHSTREAM (RHEOSTAT) 
    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   6 

    OK → REPLACE COMBINATION METER ASSEMBLY 

  4. INSPECT LIGHT CONTROL RHEOSTAT 
    1. Remove the light control rheostat.
      Fig 1: Identifying Light Control Rheostat Connector Terminal
      GTY152080Courtesy 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
      E55-3 (T) - E55-4 (RV) Turn the rheostat knob fully upwards 8 kΩ or higher
      E55-3 (T) - E55-4 (RV) Rheostat knob is between MIN. and MAX. The value changes gradually
      (Between below 1 to 8 kΩ)
      E55-3 (T) - E55-4 (RV) Turn the rheostat knob fully downwards Below 1 Ω

    NG → REPLACE LIGHT CONTROL RHEOSTAT 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL RHEOSTAT) 
    1. Disconnect the E19 and E55 connectors.
      Fig 2: Identifying E19 And E55 Connectors
      GTY140697Courtesy 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
      E19-6 (TR) - E55-4 (RV) Always Below 1 Ω
      E19-10 (E3) - E55-3 (T) Always Below 1 Ω
      E19-16 (TC) - E55-1 (TC) Always Below 1 Ω
      E55-1 (TC) - Body ground Always 10 kΩ or higher
      E55-3 (T) - Body ground Always 10 kΩ or higher
      E55-4 (RV) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE COMBINATION METER ASSEMBLY 

  6. INSPECT LIGHT CONTROL RHEOSTAT 
    1. Remove the light control rheostat with connector still connected.
      Fig 3: Identifying Light Control Rheostat Connector Terminals
      GTY135332Courtesy 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
      E55-1 (TC) - E55-3 (T) Turn the rheostat knob fully downwards Below 1 Ω
      E55-1 (TC) - E55-3 (T) Turn the rheostat knob fully upwards 8 kΩ or higher

    NG → REPLACE LIGHT CONTROL RHEOSTAT 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL RHEOSTAT) 
    1. Disconnect the E19 and E55 connectors.
      Fig 4: Identifying E19 And E55 Connectors
      GTY152081Courtesy 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
      E55-1 (TC) - E19-16 (TC) Always Below 1 Ω
      E55-1 (TC) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE COMBINATION METER ASSEMBLY 

scientia non olet · About LEMON Manuals