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.
2017 Lexus ES 300hFACTORY OEM SERVICE PROCEDURE
Dynamic Radar Cruise Control System
DYNAMIC RADAR CRUISE CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| C1A01 | Driving Support ECU |
| C1A02 | Vehicle Information Not Obtained |
| C1A0A | Front Radar Sensor Region Code Mismatch |
| C1A10 | Front Radar Sensor |
| C1A11 | Front Radar Sensor Incorrect Axial Gap |
| C1A14 | Front Radar Sensor Beam Axis Not Adjusted |
| C1A4A | Skid Control Buzzer Circuit |
| C1A52 | Driving Support ECU Communication Abnormal |
| P0571 | Brake Switch "A" Circuit |
| P0575 | Cruise Control Input Circuit |
| P1578 | Brake System |
| P1630 | Communication Error from Skid Control ECU to HV ECU |
| P1631 | Communication Error from HV ECU to Skid Control ECU |
| U0122 | Lost Communication with Vehicle Dynamics Control Module |
| U0125 | Lost Communication with Yaw Rate Sensor Module |
| U0126 | Lost Communication with Steering Angle Sensor Module |
| U0129 | Lost Communication with Brake System Control Module |
| U0235 | Lost Communication with Cruise Control Front Distance Range Sensor |
| U0293 | Lost Communication with HV ECU |
| U1104 | Lost Communication with Driving Support ECU |
| U1104 | Lost Communication with Driving Support ECU |
Factory Service Tools
Use the Manual With the Right Hardware
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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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