LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2023 >> Corolla LE >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Meter / Gauge System (Except HEV) - Diagnostic Codes (2 Of 2), Symptom Tests & Circuit Tests) >> METER / GAUGE SYSTEM (for Gasoline Model) >> Operating Light Control Rheostat does not Change Light Brightness [06/2018 - 09/2022] >> Procedure

Operating Light Control Rheostat does not Change Light Brightness [06/2018 - 09/2022]: Procedure

WARNING: This page is about a different car, the 2022 Toyota Corolla, 2021 Toyota Corolla, 2020 Toyota Corolla, and 2019 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK SYMPTOMS 
    1. Ask the customer about the problem symptoms.

      Result

      Result Proceed to
      Meter illumination does not change when operating the light control rheostat A
      Tail cancel switch malfunction B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  2

  2. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Combination Meter / Data List.
    5. Read the Data List according to the display on the Techstream.

      Body Electrical > Combination Meter > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Rheostat value Light control rheostat input Min.: 0.00%, Max.: 100.01% or Unset Increases from 0 to 100 as light control rheostat turned from low to high "Unset" is displayed when the light control rheostat is moved to the highest position (tail cancel switch is turned on).

      Body Electrical > Combination Meter > Data List 

      Tester Display
      Rheostat value

      OK

      The value displayed on the Techstream changes according to the actual light control rheostat operation.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2018 - 01/2019]  , or refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022] 

    Result: 

    NG 

    See step  3

  3. INSPECT LIGHT CONTROL RHEOSTAT 
    1. Remove the light control rheostat.

      Refer to REMOVAL [06/2018 - ]

    2. Inspect the light control rheostat.

      Refer to INSPECTION [06/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE LIGHT CONTROL RHEOSTAT. Refer to  REMOVAL [06/2018 - ] 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (LIGHT CONTROL RHEOSTAT - COMBINATION METER ASSEMBLY) 
    1. Disconnect the I27 light control rheostat connector.
    2. Disconnect the I4 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I27-5 (T) - I4-34 (SW1) Always Below 1 Ω
      I27-4 (RV) - I4-16 (SW2) Always Below 1 Ω
      I27-2 (E) - I4-11 (SW3) Always Below 1 Ω
      I27-5 (T) or I4-34 (SW1) - Body ground Always 10 kΩ or higher
      I27-4 (RV) or I4-16 (SW2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2018 - 01/2019]  , or refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Combination Meter / Data List.
    5. Read the Data List according to the display on the Techstream.

      Body Electrical > Combination Meter > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Meter Day Mode Switch Tail cancel switch (Light control rheostat) OFF or ON OFF: Tail cancel switch off
      ON: Tail cancel switch on      		 When the light control rheostat is moved to the highest position, the tail cancel switch will turn on.

      Body Electrical > Combination Meter > Data List 

      Tester Display
      Meter Day Mode Switch

      OK

      Normal conditions listed above are displayed.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2018 - 01/2019]  , or refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022] 

    Result: 

    NG 

    See step  6

  6. INSPECT LIGHT CONTROL RHEOSTAT 
    1. Remove the light control rheostat.

      Refer to REMOVAL [06/2018 - ]

    2. Inspect the light control rheostat.

      Refer to INSPECTION [06/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE LIGHT CONTROL RHEOSTAT. Refer to  REMOVAL [06/2018 - ] 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (LIGHT CONTROL RHEOSTAT - COMBINATION METER ASSEMBLY) 
    1. Disconnect the I27 light control rheostat connector.
    2. Disconnect the I4 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I27-5 (T) - I4-34 (SW1) Always Below 1 Ω
      I27-3 (TC) - I4-17 (TC) Always Below 1 Ω
      I27-5 (T) or I4-34 (SW1) - Body ground Always 10 kΩ or higher
      I27-3 (TC) or I4-17 (TC) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2018 - 01/2019]  , or refer to  REMOVAL [01/2019 - 03/2019]  , or refer to  REMOVAL [03/2019 - 09/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

scientia non olet · About LEMON Manuals