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 Lexus LX 570FACTORY OEM SERVICE PROCEDURE
Lane Departure Alert System
LANE DEPARTURE ALERT SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| C1A01 | Driving Support ECU |
| C1A10 | Front Radar Sensor |
| C1A11 | Front Radar Sensor Incorrect Axial Gap |
| C1A14 | Front Radar Sensor Beam Axis Not Adjusted |
| C1A47 | Steering Angle Sensor |
| C1A48 | G Sensor |
| C1A50 | Brake System Malfunction |
| C1A72 | Communication Error from FCM to Driving Support ECU |
| C1A73 | Driving Support ECU Receive Data Malfunction |
| C1A74 | Steering Vibrator System Malfunction |
| C1A75 | Lost Communication with Steering Vibrator System |
| C1AA0 | Front Camera Module Circuit |
| C1AA1 | FCM Destination Information Unmatched |
| C1AA2 | Vehicle Speed Tolerance Malfunction |
| C1AA3 | Vehicle Speed Sensor Circuit |
| C1AA4 | Yaw Rate Sensor Circuit |
| C1AA5 | Yaw Rate Sensor Power Supply Voltage Circuit |
| C1AA6 | Yaw Rate Sensor Zero Point Malfunction |
| C1AA9 | Front Camera Module Beam Axis Not Adjusted |
| C1AAA | FCM Destination Information Uninitialized |
| C1AAC | Vehicle Information Unmatched |
| C1AAD | Vehicle Information Initialization Incomplete |
| U0100 | Lost Communication with ECM / PCM "A" |
| U0101 | Lost Communication With TCM |
| U0123 | Lost Communication with Yaw Rate Sensor Module |
| U0126 | Lost Communication with Steering Angle Sensor Module |
| U0129 | Lost Communication with Brake System Control Module |
| U0142 | Lost Communication with Body Control Module "B" |
| U0155 | Lost Communication with Combination Meter |
| U0235 | Lost Communication with Cruise Control Front Distance Range Sensor |
| 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.