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.
2021 Toyota C-HR LEFACTORY OEM SERVICE PROCEDURE
Front Radar Sensor System
FRONT RADAR SENSOR SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION (08/2020 -)
| DTC Code | Description |
|---|---|
| C1A1100 | Front Radar Sensor Optical Axis Misalignment Malfunction |
| C1A8749 | Microwave Integrated Circuit (VCO Circuit) in Front Radar Sensor Internal Electronic Failure |
| C1A8887 | Microwave Integrated Circuit to Antenna in Front Radar Sensor Missing Message |
| C1A8987 | Antenna to Microwave Integrated Circuit in Front Radar Sensor Missing Message |
| C1A8C08 | Main Microcomputer in Front Radar Sensor Bus Signal / Message Failure |
| U030051 | Internal Control Module Software Incompatibility Not Programmed |
| U030057 | Internal Control Module Software Incompatibility Invalid/Incompatible Software Component |
| U032251 | Software Incompatibility with Body Control Module Not Programmed |
| U032257 | Software Incompatibility with Body Control Module Invalid/Incompatible Software Component |
Factory Service Tools
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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.