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Home >> Lexus >> 2017 >> IS 350 Base, AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (2GR-FSE) - Diagnostic Codes (6 Of 6) & Circuit Tests >> SFI System >> Pattern Select Switch Snow Mode Circuit [04/2013 - 10/2017] >> Procedure
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Pattern Select Switch Snow Mode Circuit [04/2013 - 10/2017]: Procedure

  1. READ VALUE USING TECHSTREAM (SNOW SWITCH STATUS) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG) and turn the Techstream on.
    3. Enter the following menus: Powertrain / Engine and ECT / Data List / Snow Switch Status.

      Powertrain > Engine > Data List 

      Tester Display
      Snow Switch Status
    4. Read the value displayed on the Techstream.

      OK

      Condition Techstream Display (Snow Switch Status)
      SNOW mode switch pushed and held ON
      SNOW mode switch not pushed OFF

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [04/2013 - 10/2017] 

    Result: 

    NG 

    See step  2

  2. INSPECT COMBINATION SWITCH ASSEMBLY 
    1. Inspect the combination switch assembly (SNOW mode switch).

      for 2WD models: Refer to INSPECTION [04/2013 - 10/2016] , or refer to INSPECTION [10/2016 - 09/2020]

      for AWD models: Refer to INSPECTION [04/2013 - 09/2020]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE COMBINATION SWITCH ASSEMBLY 

    for 2WD models: Refer to REMOVAL [04/2013 - 09/2020]

    for AWD models: Refer to REMOVAL [04/2013 - 09/2020]

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (ECM - COMBINATION SWITCH ASSEMBLY) 
    1. Disconnect the combination switch assembly connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A77-22 (SNWI) - K81-3 (SNSW) Always Below 1 Ω
      A77-22 (SNWI) or K81-3 (SNSW) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - BODY GROUND) 
    1. Disconnect the combination switch assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K81-16 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [04/2013 - 10/2017] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR