Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSTOYOTA2012PRIUS THREEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 129 (PRE-COLLISION SYSTEM (PLUG-IN) (DIAGNOSTIC CODES & CIRCUIT TESTS))PRE-COLLISION SYSTEMDTC C1A10: FRONT RADAR SENSORPROCEDURE

2012 Toyota Prius Three

DTC C1A10: Front Radar Sensor: Procedure

2012 Toyota Prius ThreeSECTION Procedure

WARNING: This page is about a different variant/trim than selected.

REPLACE MILLIMETER WAVE RADAR SENSOR
1. Replace the millimeter wave radar sensor. Refer to REMOVAL .
NEXT: Go to next step
ADJUST MILLIMETER WAVE RADAR SENSOR
1. Adjust the millimeter wave radar sensor. Refer to ADJUSTMENT .
NEXT: Go to next step
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. Recheck for DTCs.
  OK
  
  DTC C1A10 is not output.
NG → See step 4

OK → END
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.