C1A11 Lexus Code - Front Radar Sensor Incorrect Axial Gap
Quick Answer
For vehicles with Dynamic Radar Cruise Control System: The Driving Support ECU Assembly uses the Millimeter Wave Radar Sensor Assembly to detect objects in front of the vehicle. Common causes include Faulty Millimeter Wave Radar Sensor Assembly, Millimeter Wave Radar Sensor Assembly harness is open or shorted, Millimeter Wave Radar Sensor Assembly circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- C1A11 Lexus indicates Front Radar Sensor Incorrect Axial Gap.
- Common causes
- Common causes include Faulty Millimeter Wave Radar Sensor Assembly, Millimeter Wave Radar Sensor Assembly harness is open or shorted, Millimeter Wave Radar Sensor Assembly circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code C1A11 Lexus Description
For vehicles with Forward Recognition Camera System: The Forward Recognition Camera uses the Millimeter Wave Radar Sensor Assembly to detect obstacles in front of the vehicle. When the vehicle is determined to be driving in a straight line or on a gradual curve based on signals from the yaw rate sensor etc., the Millimeter Wave Radar Sensor Assembly performs self-diagnosis to check if the sensor beam axis has deviated from the vehicle movement direction. When the Millimeter Wave Radar Sensor Assembly beam axis has deviated, the Forward Recognition Camera detects this, and stores DTC C1A11. After installing a new Millimeter Wave Radar Sensor Assembly, if sensor beam axis adjustment is not performed, DTC C1A14 is stored.
For vehicles with Lane Departure Alert System (W/ Steering Control): The Forward Recognition Camera uses the Millimeter Wave Radar Sensor Assembly to detect obstacles in front of the vehicle. When the vehicle is determined to be driving in a straight line or on a gradual curve based on signals from the yaw rate sensor etc., the Millimeter Wave Radar Sensor Assembly performs self-diagnosis to check if the sensor beam axis has deviated from the vehicle movement direction. When the Millimeter Wave Radar Sensor Assembly beam axis has deviated, the Forward Recognition Camera detects this, and stores DTC C1A11.
After installing a new Millimeter Wave Radar Sensor Assembly, if sensor beam axis adjustment is not performed, DTC C1A14 is stored.
For vehicles with Pre-collision System: The Driving Support ECU Assembly uses the Millimeter Wave Radar Sensor Assembly to detect obstacles in front of the vehicle. Based on this information, the Driving Support ECU Assembly sends pre-collision control operation signals. When the vehicle is determined to be driving in a straight line or on a gradual curve based on signals from the airbag sensor assembly etc., the Millimeter Wave Radar Sensor Assembly performs self-diagnosis to check if the sensor beam axis has deviated from the vehicle movement direction. When the Millimeter Wave Radar Sensor Assembly beam axis has deviated, the Driving Support ECU Assembly detects this, and stores DTC C1A11. After installing a new Millimeter Wave Radar Sensor Assembly, if sensor beam axis adjustment is not performed, DTC C1A14 is stored.
What are the Possible Causes of the DTC C1A11 Lexus?
- Faulty Millimeter Wave Radar Sensor Assembly
- Millimeter Wave Radar Sensor Assembly harness is open or shorted
- Millimeter Wave Radar Sensor Assembly circuit poor electrical connection
- Faulty Forward Recognition Camera (If equipped)
- Faulty Driving Support ECU Assembly
How to Fix the DTC C1A11 Lexus?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
When the Millimeter Wave Radar Sensor Assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.
If the Forward Recognition Camera has been replaced with a new one, be sure to perform Recognition Camera/Target Position Memory and Recognition Camera Axis Adjust.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the C1A11 Lexus code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about C1A11 Lexus Code
1. What does the OBDII code C1A11 mean on a Lexus?
C1A11 indicates that the front radar sensor on a Lexus has an incorrect axial gap, which can affect the vehicle's adaptive cruise control and pre-collision system.
2. What are the common symptoms of code C1A11 in a Lexus?
Symptoms may include malfunctioning adaptive cruise control, deactivation of the pre-collision system, warning lights on the dashboard, and error messages related to the radar system.
3. What causes the C1A11 code on a Lexus?
This code can be caused by improper alignment of the front radar sensor, physical damage to the sensor, loose mounting brackets, or debris obstructing the radar.
4. How do I fix the C1A11 code on my Lexus?
Fixing this code may involve realigning the radar sensor, repairing or replacing damaged brackets, cleaning the sensor area, or recalibrating the system using specialized diagnostic tools.
5. Can I drive my Lexus with the C1A11 code active?
While the vehicle may still be drivable, systems like adaptive cruise control and pre-collision may not function, potentially reducing safety. It’s best to address the issue promptly.
6. How is the C1A11 code diagnosed on a Lexus?
A technician will use a scan tool to confirm the code, inspect the radar sensor for alignment or damage, check the mounting brackets, and test for any physical obstructions.
7. Do I need to recalibrate the radar sensor after fixing code C1A11?
Yes, recalibration is often necessary after repairs to ensure the radar sensor functions correctly and aligns with the vehicle’s systems.
8. Can weather conditions cause the C1A11 code to appear?
Yes, extreme weather conditions like heavy rain, snow, or ice can temporarily obstruct the radar sensor, but persistent issues likely indicate a mechanical or alignment problem.
9. How much does it cost to repair the C1A11 code on a Lexus?
The cost varies depending on the issue. Simple realignment or cleaning may cost under $200, while sensor replacement or complex repairs can exceed $1,000, including parts and labor.
10. Can I prevent the C1A11 code from occurring on my Lexus?
Regularly inspect and clean the front radar sensor area, avoid impacts to the front bumper, and ensure the system is recalibrated after any front-end repairs or collisions.
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