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Home >> Lexus >> 2017 >> IS 300 F Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 131 (Automatic Transmission System (Aa81E, For 8AR-FTS) - Diagnostic Codes (4 Of 4) & Circuit Tests) >> AUTOMATIC TRANSMISSION SYSTEM (for 8AR-FTS) >> Shift Paddle Switch Circuit [08/2015 - 10/2016] >> Procedure

Shift Paddle Switch Circuit [08/2015 - 10/2016]: Procedure

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2024 Lexus IS 300, 2023 Lexus IS 300, 2022 Lexus IS 300, 2021 Lexus IS 300, and 2020 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK VEHICLE CONDITION 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      w/o Dynamic Radar Cruise Control System A
      w/ Dynamic Radar Cruise Control System B

    Result: 

    B 

    See step  10

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (SHIFT PADDLE SWITCH - ECM) 
    1. Disconnect the A91 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A91-42 (SFTU) - A91-41 (ECCS) Pull continuously "+" (Up shift) Below 2.5 Ω
      Release "+" (Up shift) 1 MΩ or higher
      A91-43 (SFTD) - A91-41 (ECCS) Pull continuously "-" (Down shift) Below 2.5 Ω
      Release "-" (Down shift) 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  3

  3. CHECK WIRE HARNESS AND CONNECTORS (ECM - BODY GROUND) 
    1. Disconnect the F78 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F78-53 (E1) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2015 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND) 

  4. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - ECM) 
    1. Disconnect the K26 spiral cable sub-assembly connector.
    2. Disconnect the A91 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A91-42 (SFTU) - K26-14 (SUP) Always Below 1 Ω
      A91-43 (SFTD) - K26-7 (SDN) Always Below 1 Ω
      A91-41 (ECCS) - K26-2 (ECC) Always Below 1 Ω
      A91-42 (SFTU) or K26-14 (SUP) - Body ground Always 10 kΩ or higher
      A91-43 (SFTD) or K26-7 (SDN) - Body ground Always 10 kΩ or higher
      A91-41 (ECCS) or K26-2 (ECC) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - ECM) 

    Result: 

    OK 

    See step  5

  5. INSPECT SPIRAL CABLE SUB-ASSEMBLY 
    1. Inspect the spiral cable sub-assembly.

      Refer to INSPECTION [04/2013 - 10/2016]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to  COMPONENTS [04/2013 - 10/2016] 

    Result: 

    OK 

    See step  6

  6. INSPECT TRANSMISSION SHIFT SWITCH ASSEMBLY (SHIFT PADDLE SWITCH LH) 
    1. Remove the transmission shift switch assembly (shift paddle switch LH).

      Refer to REMOVAL [04/2013 - 10/2016]

      GTY512900Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Shift Paddle Switch LH (Transmission Shift Switch Assembly))
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C-1 (SDN) - C-2 (ECC) Pull continuously "-" (Down shift) Below 2.5 Ω
      Release "-" (Down shift) 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE TRANSMISSION SHIFT SWITCH ASSEMBLY (SHIFT PADDLE SWITCH LH). Refer to  COMPONENTS [04/2013 - 10/2016] 

    Result: 

    OK 

    See step  7

  7. INSPECT TRANSMISSION SHIFT SWITCH ASSEMBLY (SHIFT PADDLE SWITCH RH) 
    1. Remove the transmission shift switch assembly (shift paddle switch RH).
      GTY497451Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Shift Paddle Switch RH (Transmission Shift Switch Assembly))

      Refer to REMOVAL [04/2013 - 10/2016]

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B-3 (SUP) - B-2 (ECC) Pull continuously "+" (Up shift) Below 2.5 Ω
      Release "+" (Up shift) 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE TRANSMISSION SHIFT SWITCH ASSEMBLY (SHIFT PADDLE SWITCH RH). Refer to  COMPONENTS [04/2013 - 10/2016] 

    Result: 

    OK 

    See step  8

  8. INSPECT NO. 1 SWITCH WIRE 
    1. Install the transmission shift switch assembly.
      GTY517398Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Steering Pad Switch Assembly)

      Refer to INSTALLATION [04/2013 - 10/2016]

    2. Disconnect the z6 No. 1 switch wire connector from the steering pad switch assembly.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      z6-1 (SUP) - z6-3 (ECC) Pull continuously "+" (Up shift) Below 2.5 Ω
      Release "+" (Up shift) 1 MΩ or higher
      z6-2 (SDN) - z6-3 (ECC) Pull continuously "-" (Down shift) Below 2.5 Ω
      Release "-" (Down shift) 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 1 SWITCH WIRE. Refer to  COMPONENTS [04/2013 - 10/2016] 

    Result: 

    OK 

    See step  9

  9. INSPECT STEERING PAD SWITCH ASSEMBLY 
    1. Connect the z6 No. 1 switch wire connector to the steering pad switch assembly.
      GTY507924Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Spiral Cable Sub-assembly)
    2. Disconnect the z4 steering pad switch assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      z4-6 (SUP) - z4-7 (ECC) Pull continuously "+" (Up shift) Below 2.5 Ω
      Release "+" (Up shift) 1 MΩ or higher
      z4-12 (SDN) - z4-7 (ECC) Pull continuously "-" (Down shift) Below 2.5 Ω
      Release "-" (Down shift) 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2015 - ] 

    Result: 

    NG 

    REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to  COMPONENTS [04/2013 - 10/2016] 

  10. CHECK HARNESS AND CONNECTOR (SHIFT PADDLE SWITCH - ECM) 
    1. Disconnect the A91 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A91-42 (SFTU) - Body ground Pull continuously "+" (Up shift) Below 2.5 Ω
      Release "+" (Up shift) 1 MΩ or higher
      A91-43 (SFTD) - Body ground Pull continuously "-" (Down shift) Below 2.5 Ω
      Release "-" (Down shift) 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2015 - ] 

    Result: 

    NG 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - ECM) 
    1. Disconnect the K26 spiral cable sub-assembly connector.
    2. Disconnect the A91 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A91-42 (SFTU) - K26-14 (SUP) Always Below 1 Ω
      A91-43 (SFTD) - K26-7 (SDN) Always Below 1 Ω
      A91-42 (SFTU) or K26-14 (SUP) - Body ground Always 10 kΩ or higher
      A91-43 (SFTD) or K26-7 (SDN) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND) 
    1. Disconnect the K26 spiral cable sub-assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K26-2 (ECC) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  5

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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