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Transmission Control Switch Circuit [11/2022 - ]: Procedure

WARNING: This page is about a different car, the 2025 Toyota Corolla Cross, 2024 Toyota Corolla Cross, and 2023 Toyota Corolla Cross. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING GTS (SPORTS SHIFT POSITION) 
    1. Read the value displayed on the GTS.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Sports Shift Position

      Result

      Result Proceed to
      The display changes according to the shift lever operation. A
      The display does not change according to the shift lever operation. B
    2. Turn the ignition switch off.

    Result: 

    B 

    See step  4

    Result: 

    A 

    See step  2

  2. READ VALUE USING GTS (SPORTS SHIFT UP SIGNAL, SPORTS SHIFT DOWN SIGNAL) 
    1. Read the value displayed on the GTS.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Sports Shift UP Signal
      Sports Shift DOWN Signal

      Result

      Result Proceed to
      The display changes according to the transmission control switch (shift lock control unit assembly) operation. A
      The display does not change according to the transmission control switch (shift lock control unit assembly) operation. B
    2. Turn the ignition switch off.

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  3

  3. CHECK FOR INTERMITTENT PROBLEMS 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU 

    Refer to REMOVAL [11/2022 - 12/2024] , or refer to REMOVAL [12/2024 - ]

    Result: 

    NG 

    REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Disconnect the transmission control switch (shift lock control unit assembly) connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      I16-4 (IG) - Body ground Ignition switch ON 11 to 14 V
      I16-4 (IG) - Body ground Ignition switch off Below 1 V
    3. Turn the ignition switch off.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      I16-2 (E) - Body ground Ignition switch off Below 1 Ω
    5. Reconnect the transmission control switch (shift lock control unit assembly) connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CHECK POWER SOURCE CIRCUIT 

    Result: 

    OK 

    See step  5

  5. INSPECT TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY) 
    1. Disconnect the transmission control switch (shift lock control unit assembly) connector.
    2. Measure the resistance according to the value(s) in the table below when the shift lever is moved to each position.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I16-4 (IG) - I16-5 (S) Shift lever in S
      Shift lever held in "+" or "-"      		 Below 1 Ω
      I16-4 (IG) - I16-5 (S) Shift lever in any position except S 10 kΩ or higher
      I16-3 (SFTU) - I16-2 (E) Shift lever held in "+" Below 1 Ω
      I16-3 (SFTU) - I16-2 (E) Shift lever in S 10 kΩ or higher
      I16-1 (SFTD) - I16-2 (E) Shift lever held in "-" Below 1 Ω
      I16-1 (SFTD) - I16-2 (E) Shift lever in S 10 kΩ or higher
      GTY1109951Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Transmission Control Switch (Shift Lock Control Unit Assembly))
    3. Reconnect the transmission control switch (shift lock control unit assembly) connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY 

    Refer to REMOVAL [11/2022 - ]

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY)) 
    1. Disconnect the hybrid vehicle control ECU connector.
    2. Disconnect the spiral cable sub-assembly connector. (w/ Shift paddle switch)
    3. Turn the ignition switch to ON.
    4. Measure the voltage according to the value(s) in the table below when the shift lever is moved to each position.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I249-4 (M) - Body ground Ignition switch ON
      Shift lever in S, "+" or "-"      		 11 to 14 V
      Ignition switch ON
      Except shift lever in S, "+" and "-"      		 Below 1 V
      NOTE:

      If the ignition switch is turned ON with the hybrid vehicle control ECU connector disconnected, other DTCs will be stored. After performing the inspection, clear the DTCs.

    5. Turn the ignition switch off.
    6. Measure the resistance according to the value(s) in the table below when the shift lever is moved to each position.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I249-31 (SFTU) - Body ground Shift lever held in "+" Below 1 Ω
      I249-31 (SFTU) - Body ground Shift lever in S 10 kΩ or higher
      I249-18 (SFTD) - Body ground Shift lever held in "-" Below 1 Ω
      I249-18 (SFTD) - Body ground Shift lever in S 10 kΩ or higher
    7. Reconnect the spiral cable sub-assembly connector. (w/ Shift paddle switch)
    8. Reconnect the hybrid vehicle control ECU connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU 

    Refer to REMOVAL [11/2022 - 12/2024] , or refer to REMOVAL [12/2024 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. INSPECT TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY) 
    1. Disconnect the transmission control switch (shift lock control unit assembly) connector.
    2. Measure the resistance according to the value(s) in the table below when the shift lever is moved to each position.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I16-3 (SFTU) - I16-2 (E) Shift lever held in "+" Below 1 Ω
      I16-3 (SFTU) - I16-2 (E) Shift lever in S 10 kΩ or higher
      I16-1 (SFTD) - I16-2 (E) Shift lever held in "-" Below 1 Ω
      I16-1 (SFTD) - I16-2 (E) Shift lever in S 10 kΩ or higher
      GTY1109950Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (to Transmission Control Switch (Shift Lock Control Unit Assembly))
    3. Reconnect the transmission control switch (shift lock control unit assembly) connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY 

    Refer to REMOVAL [11/2022 - ]

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY) - HYBRID VEHICLE CONTROL ECU) 
    1. Disconnect the hybrid vehicle control ECU connector.
    2. Disconnect the spiral cable sub-assembly connector. (w/ Shift paddle switch)
    3. Measure the resistance according to the value(s) in the table below when the shift lever is moved to each position.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I249-31 (SFTU) - Body ground Shift lever held in "+" Below 1 Ω
      Shift lever in S 10 kΩ or higher
      I249-18 (SFTD) - Body ground Shift lever held in "-" Below 1 Ω
      Shift lever in S 10 kΩ or higher
    4. Reconnect the spiral cable sub-assembly connector. (w/ Shift paddle switch)
    5. Reconnect the hybrid vehicle control ECU connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU 

    Refer to REMOVAL [11/2022 - 12/2024] , or refer to REMOVAL [12/2024 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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