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Pattern Select Switch Snow Mode Circuit [10/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus LS 500h. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING TECHSTREAM (CAN BUS CHECK) 

    See step  2

    Result

    Proceed to
    A
    B

    Result: 

    B 

    GO TO CAN COMMUNICATION SYSTEM 

    w/ Front LiDAR Sensor: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

    w/o Front LiDAR Sensor: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

    Result: 

    A 

    See step  2

  2. CHECK DTC OUTPUT (HEALTH CHECK) 

    See step  3

    Result

    Proceed to
    A
    B

    Result: 

    B 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2023 - ] 

    Result: 

    A 

    See step  3

  3. READ VALUE USING TECHSTREAM (SNOW MODE SWITCH) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Hybrid Control / Data List / Snow Mode Switch.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Snow Mode Switch
    5. Read the value displayed on the Techstream.

      Powertrain > Hybrid Control > Data List 

      Tester Display Measurement Item Range Normal Condition
      Snow Mode Switch Snow mode switch (No. 2 satellite switch set) condition ON or OFF Snow mode switch (No. 2 satellite switch set) not operated: OFF
      Snow mode switch (No. 2 satellite switch set) being pushed and held: ON

      Result

      Result Proceed to
      The display changes according to the snow mode switch (No. 2 satellite switch set) operation. A
      The display does not change according to the snow mode switch (No. 2 satellite switch set) operation. B
    6. Turn the power switch off.

    Result: 

    A 

    GO TO PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2023 - ] 

    Result: 

    B 

    See step  4

  4. INSPECT SNOW MODE SWITCH (NO. 2 SATELLITE SWITCH SET) 
    1. Inspect the snow mode switch (No. 2 satellite switch set).

      Refer to INSPECTION [10/2017 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SNOW MODE SWITCH (NO. 2 SATELLITE SWITCH SET). Refer to  REMOVAL [10/2017 - ] 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (SNOW MODE SWITCH (NO. 2 SATELLITE SWITCH SET) - BODY GROUND) 
    1. Disconnect the G59 snow mode switch (No. 2 satellite switch set) connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY823197Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Snow Mode Switch (No. 2 Satellite Switch Set))

      Standard Resistance

      Tester Connection Condition Specified Condition
      G59-7 (E) - Body ground Power switch off Below 1 Ω
    3. Reconnect the G59 snow mode switch (No. 2 satellite switch set) connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (SNOW MODE SWITCH (NO. 2 SATELLITE SWITCH SET) - HYBRID VEHICLE CONTROL ECU ASSEMBLY) 
    1. Disconnect the G59 snow mode switch (No. 2 satellite switch set) connector.
    2. Disconnect the G166 hybrid vehicle control ECU assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY1086165Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Snow Mode Switch (No. 2 Satellite Switch Set))
      *b Front view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      G59-3 (SNSW) - G166-36 (SNOW) Power switch off Below 1 Ω
      G59-3 (SNSW) or G166-36 (SNOW) - Body ground Power switch off 10 kΩ or higher
    4. Reconnect the G166 hybrid vehicle control ECU assembly connector.
    5. Reconnect the G59 snow mode switch (No. 2 satellite switch set) connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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