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Home >> Lexus >> 2021 >> RC F Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Cruise Control Systems >> Dynamic Radar Cruise Control System - Diagnostic Codes & Circuit Tests >> Dynamic Radar Cruise Control System >> Distance Control Switch Circuit [09/2014 - 11/2017] >> Procedure

Distance Control Switch Circuit [09/2014 - 11/2017]: Procedure

  1. READ VALUE ON TECHSTREAM (DISTANCE CONTROL SWITCH) 
    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 / Data List.
    5. Read the Data List according to the display on the Techstream.

      Powertrain > Radar Cruise > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Distance Control Switch Distance control switch signal ON or OFF ON: Distance control switch on
      OFF: Distance control switch off
      -

      Powertrain > Radar Cruise > Data List 

      Tester Display
      Distance Control Switch

      OK

      When the steering pad switch assembly (distance control switch) is operated, the display changes as shown above.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2014 - 11/2017] 

    Result: 

    NG 

    See step  2

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

      Refer to REMOVAL [09/2014 - 11/2017]

    2. Inspect the steering pad switch assembly.

      Refer to INSPECTION [09/2014 - 11/2017]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to  REMOVAL [09/2014 - 11/2017] 

    Result: 

    OK 

    See step  3

  3. INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY 
    1. Remove the spiral with sensor cable sub-assembly.

      Refer to REMOVAL [09/2014 - 11/2017]

    2. Inspect the spiral with sensor cable sub-assembly.

      Refer to INSPECTION [09/2014 - 11/2017]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY. Refer to  REMOVAL [09/2014 - 11/2017] 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY - DRIVING SUPPORT ECU ASSEMBLY AND BODY GROUND) 
    1. Disconnect the O25 spiral with sensor cable sub-assembly connector.
    2. Disconnect the Q1 driving support ECU assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O25-12 (DIST) - Q1-6 (SPSW) Always Below 1 Ω
      O25-2 (ECC) - Body ground Always Below 1 Ω
      O25-12 (DIST) or Q1-6 (SPSW) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to  REMOVAL [09/2014 - 01/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR