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HOMESERVICE MANUALSTOYOTA2012PRIUS FIVEREPAIR AND DIAGNOSISRESTRAINTSRESTRAINTS CONTROL SYSTEMSPRE-COLLISION SYSTEM (EXCEPT PLUG-IN) (DIAGNOSTIC CODES & CIRCUIT TESTS)PRE-COLLISION SYSTEMDTC C1A20: OBJECT RECOGNITION ECUPROCEDURE
2012 Toyota Prius Five

DTC C1A20: Object Recognition ECU: Procedure

2012 Toyota Prius FiveSECTION Procedure
  1. REPLACE LANE RECOGNITION CAMERA SENSOR ASSEMBLY 
    1. Replace the lane recognition camera sensor assembly. Refer to REMOVAL .
    2. Adjust the lane recognition camera sensor assembly. Refer to ADJUSTMENT .

    NEXT: Go to next step 

  2. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) 
    1. Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
    2. Clear the DTCs. Refer to DTC CHECK / CLEAR .
    3. Turn the power switch off.
    4. Turn the power switch on (IG).
    5. Drive the vehicle at a speed of 50 km/h (30 mph) or more with lane keeping assist switch on.
    6. Recheck for DTCs.

      OK

      DTC C1A20 is not output.

    NG → See step   3 

    OK → END 

  3. REPLACE DRIVING SUPPORT ECU. Refer to  REMOVAL 
RENDER: 1.0x

NO RELATED

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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.