2012 Lexus IS 250C Automatic TransFACTORY OEM SERVICE PROCEDURE

DTC P1570: Radar Sensor Malfunction: Procedure

  1. ADJUST MILLIMETER WAVE RADAR SENSOR ASSEMBLY 
    1. Adjust the millimeter wave radar sensor assembly. Refer to ADJUSTMENT .

    NEXT: Go to next step 

  2. CHECK WHETHER DTC OUTPUT RECURS (DTC P1570) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs. Refer to DTC CHECK / CLEAR .
    5. Perform the following to make sure that the DTC detection conditions are met.

      HINT: 

      If the detection conditions are not met, the malfunction cannot be detected.

      1. Drive the vehicle at a speed of 50 km/h (30 mph) or more.
      2. Turn the cruise control main switch on.
    6. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.
    7. Read the DTCs. Refer to DTC CHECK / CLEAR .
      RESULT

      Result Proceed to
      DTC is not output A
      DTC P1570 is output B

    B → See step   3 

    A → END 

  3. REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY. Refer to  REMOVAL 
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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