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Home >> Lexus >> 2020 >> ES 300h Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 77 (Dynamic Radar Cruise Control System (Except Hybrid) - Diagnostic Codes & Circuit Tests) >> DYNAMIC RADAR CRUISE CONTROL SYSTEM (for Gasoline Model) >> Steering Pad Switch Circuit [06/2018 - 08/2020] >> Procedure

Steering Pad Switch Circuit [06/2018 - 08/2020]: Procedure

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2024 Lexus ES 350, 2024 Lexus ES 250, 2023 Lexus ES 350, 2023 Lexus ES 250, and 2022 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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: Powertrain / Radar Cruise 1 / Data List.
    5. Read the Data List according to the display on the Techstream.

      Powertrain > Radar Cruise1 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Cancel Switch CANCEL switch status ON or OFF ON: CANCEL switch pushed
      OFF: CANCEL switch not pushed      		 -
      -SET Switch -SET switch status ON or OFF ON: -SET switch pushed
      OFF: -SET switch not pushed      		 -
      +RES Switch +RES switch status ON or OFF ON: +RES switch pushed
      OFF: +RES switch not pushed      		 -
      Cruise Main Switch Operation Condition Cruise control main switch status ON or OFF ON: Cruise control main switch pushed
      OFF: Cruise control main switch not pushed      		 -

      Powertrain > Radar Cruise1 > Data List 

      Tester Display
      Cancel Switch
      -SET Switch
      +RES Switch
      Cruise Main Switch Operation Condition

      OK

      The value of each Data List item changes according to the operation of the steering pad switch assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2018 - 08/2020] 

    Result: 

    NG 

    See step  2

  2. INSPECT STEERING PAD SWITCH ASSEMBLY 
    1. Remove the steering pad switch assembly.

      Refer to REMOVAL [06/2018 - 08/2021]

    2. Inspect the steering pad switch assembly.

      Refer to INSPECTION [06/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to  COMPONENTS [06/2018 - ] 

    Result: 

    OK 

    See step  3

  3. INSPECT SPIRAL CABLE SUB-ASSEMBLY 
    1. Remove the spiral cable sub-assembly.

      Refer to REMOVAL [06/2018 - 08/2020]

    2. Inspect the spiral cable sub-assembly.

      Refer to INSPECTION [06/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to  COMPONENTS [06/2018 - ] 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - ECM AND BODY GROUND) 
    1. Disconnect the G20 spiral cable sub-assembly connector.
    2. Disconnect the A25 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G20-13 (CCS) - A25-41 (CCS) Always Below 1 Ω
      G20-2 (ECC) - Body ground Always Below 1 Ω
      G20-13 (CCS) or A25-41 (CCS) - Body ground Always 10 kΩ or higher
    4. Connect the A25 ECM connector.
    5. Connect the G20 spiral cable sub-assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  COMPONENTS [06/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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