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How To Proceed With Troubleshooting [05/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus LC 500. However, it is still accessible from the selected car via links, so may be relevant.
  1. VEHICLE BROUGHT TO WORKSHOP 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  2

  2. CUSTOMER PROBLEM ANALYSIS 
    1. Interview the customer and confirm the problem.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. PRE-CHECK 
    1. Measure the battery voltage.

      Standard Voltage

      11 to 14 V

      HINT: 

      If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

    2. Check the fuses and relays.
    3. Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK FOR DTCs* (HEALTH CHECK) 
    1. Using the Techstream, perform the Health Check.

      OK

      System DTCs other than DTCs related to the dynamic radar cruise control system (Cruise Control) and dynamic radar cruise control system (Radar Cruise2) are not output.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [05/2023 - ]  

    Result: 

    OK 

    See step  5

  5. CHECK MULTI-INFORMATION DISPLAY 
    1. Check if a warning message is displayed on the multi-information display in the combination meter assembly.

      HINT: 

      If more than one message is displayed, perform each inspection in the order of A, B and C.

      Result

      Result Proceed to
      "Cruise Control Malfunction Visit Your Dealer" is displayed A
      One of the following warning messages is displayed:
      • "Radar Cruise Control Unavailable See Owner's Manual"
      • "Radar Cruise Control Unavailable"
      		 B
      No dynamic radar cruise control system warnings are displayed C

    Result: 

    B 

    See step  9

    Result: 

    C 

    See step  11

    Result: 

    A 

    See step  6

  6. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* 
    1. Using the Techstream, check for CAN communication system DTCs.

      Refer to DIAGNOSIS SYSTEM [05/2023 - ]

      Result

      Result Proceed to
      CAN DTCs are not output A
      CAN DTCs are output B

    Result: 

    B 

    GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2023 - ] 

    Result: 

    A 

    See step  7

  7. CHECK FOR DTCs* 
    1. Using the Techstream, check for DTCs.

      Powertrain > Radar Cruise1 > Trouble Codes 

      Powertrain > Radar Cruise2 > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      DTCs are output B

    Result: 

    A 

    See step  9

    Result: 

    B 

    See step  8

  8. RECONFIRM DTC OUTPUT* 
    1. Using the Techstream, clear the DTCs.

      Powertrain > Radar Cruise1 > Clear DTCs 

      Powertrain > Radar Cruise2 > Clear DTCs 

    2. Reproduce the vehicle conditions that were present when the DTCs that were noted were stored.

      HINT: 

      Refer to each corresponding DTC for details on the detection conditions.

      Refer to DIAGNOSTIC TROUBLE CODE CHART [05/2023 - ] 

    3. Using the Techstream, check for DTCs.

      Powertrain > Radar Cruise1 > Trouble Codes 

      Powertrain > Radar Cruise2 > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      DTCs are output B

    Result: 

    A 

    GO TO SYMPTOM SIMULATION. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - ] 

    Result: 

    B 

    GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [05/2023 - ]  

  9. CHECK VEHICLE CONTROL HISTORY (RoB)* 
    1. Using the Techstream, check for Vehicle Control History (RoB).

      Powertrain > Radar Cruise2 > Utility 

      Tester Display
      Vehicle Control History (RoB)
    2. Make a note of the output Vehicle Control History (RoB).

      Result

      Result Proceed to
      Vehicle Control History (RoB) is not output A
      Vehicle Control History (RoB) X2013, X2015, X2022, X2026 or X2028 is output B
      Vehicle Control History (RoB) other than X2013, X2015, X2022, X2026 or X2028 is output C

    Result: 

    A 

    GO TO SYMPTOM SIMULATION. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - ] 

    Result: 

    B 

    GO TO VEHICLE CONTROL HISTORY (RoB). Refer to  VEHICLE CONTROL HISTORY (RoB) [05/2023 - ] 

    Result: 

    C 

    See step  10

  10. RECONFIRM VEHICLE CONTROL HISTORY (RoB)* 
    1. Using the Techstream, clear the Vehicle Control History (RoB).

      Powertrain > Radar Cruise2 > Utility 

      Tester Display
      Vehicle Control History (RoB)
    2. Using the Techstream, check for Vehicle Control History (RoB).

      Powertrain > Radar Cruise2 > Utility 

      Tester Display
      Vehicle Control History (RoB)

      Result

      Result Proceed to
      Vehicle Control History (RoB) is not output A
      Vehicle Control History (RoB) is output B

    Result: 

    A 

    GO TO SYMPTOM SIMULATION. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - ] 

    Result: 

    B 

    GO TO VEHICLE CONTROL HISTORY (RoB). Refer to  VEHICLE CONTROL HISTORY (RoB) [05/2023 - ] 

  11. PROBLEM SYMPTOMS TABLE 

    HINT: 

    Refer to Problem Symptoms Table.

    Refer to PROBLEM SYMPTOMS TABLE [05/2023 - ] 

    Result

    Result Proceed to
    Fault is not listed in Problem Symptoms Table A
    Fault is listed in Problem Symptoms Table B

    Result: 

    B 

    GO TO PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [05/2023 - ]  

    Result: 

    A 

    See step  12

  12. INSPECT MILLIMETER WAVE RADAR SENSOR ASSEMBLY (BEAM AXIS MISALIGNMENT READING)* 
    NOTE:

    Before checking for millimeter wave radar sensor beam axis misalignment, make sure that the radiator grille and front bumper are correctly installed and have not been damaged or modified.

    1. Adjust the reflector height.

      Triangle Target: Refer to TARGET ADJUSTMENT (TRIANGLE TARGET) [05/2023 - ]

      Flat Surface Target: Refer to TARGET ADJUSTMENT (FLAT SURFACE TARGET) [05/2023 - ]

    2. Place the reflector.

      Triangle Target: Refer to TARGET ADJUSTMENT (TRIANGLE TARGET) [05/2023 - ]

      Flat Surface Target: Refer to TARGET ADJUSTMENT (FLAT SURFACE TARGET) [05/2023 - ]

    3. Using the Techstream, check the amount of misalignment.

      Body Electrical > Front Radar Sensor > Utility 

      Tester Display
      Front Beam Axis Misalignment Reading

      Standard

      Vertical Direction -5 to 5 deg.
      Horizontal Direction -0.6 to 0.6 deg.

      HINT: 

      The millimeter wave radar sensor assembly automatically calibrates the beam axis while the vehicle is being driven. The specified values apply to the automatic calibration only and do not apply during manual beam axis calibration of the millimeter wave radar sensor assembly.

      Result

      Result Proceed to
      The beam axis values are within specification A
      The beam axis values are not within specification B

    Result: 

    A 

    GO TO SYMPTOM SIMULATION. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - ] 

    Result: 

    B 

    ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY 

    HINT: 

    Beam axis alignment of the millimeter wave radar sensor assembly can be performed using either Triangle Target, Flat Surface Target or Driving Adjustment.

    Triangle Target: Refer to TARGET ADJUSTMENT (TRIANGLE TARGET) [05/2023 - ]

    Flat Surface Target: Refer to TARGET ADJUSTMENT (FLAT SURFACE TARGET) [05/2023 - ]

    Driving Adjustment: Refer to DRIVING ADJUSTMENT [05/2023 - ]

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