AutoCodes – Lexus – C1A4A Lexus

C1A4A Lexus Code - Skid Control Buzzer Circuit

Quick Answer

For vehicles with Dynamic Radar Cruise Control System: Based on Dynamic Radar Cruise Control System operation, the Driving Support ECU Assembly provides warnings to the driver by sounding the Skid Control Buzzer. Common causes include Faulty Skid Control Buzzer, Skid Control Buzzer harness is open or shorted, Skid Control Buzzer 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: C1A4A Lexus indicates Skid Control Buzzer Circuit.
Common causes: Common causes include Faulty Skid Control Buzzer, Skid Control Buzzer harness is open or shorted, Skid Control Buzzer 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.

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Code Popularity 946

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 02, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1A4A Lexus Description

For vehicles with Dynamic Radar Cruise Control System: Based on Dynamic Radar Cruise Control System operation, the Driving Support ECU Assembly provides warnings to the driver by sounding the Skid Control Buzzer. The Diagnostic Trouble Code (DTC) C1A4A is stored when a malfunction is detected in the skid control buzzer assembly circuit.

For vehicles with Pre-collision System: Based on pre-collision control, the Driving Support ECU Assembly provides warnings to the driver. The Driving Support ECU Assembly does this by sending a request signal to the Millimeter Wave Radar Sensor Assembly to sound the Skid Control Buzzer. When the Millimeter Wave Radar Sensor Assembly detects a malfunction in the Skid Control Buzzer circuit, a malfunction signal is sent to the Driving Support ECU Assembly, and this DTC is stored.

OBDII Code C1A4A Lexus - Skid Control Buzzer Circuit - AutoCodes.com — C1A4A Lexus Code - Skid Control Buzzer Circuit

What does this mean?

What are the Possible Causes of the DTC C1A4A Lexus?

Faulty Skid Control Buzzer
Skid Control Buzzer harness is open or shorted
Skid Control Buzzer circuit poor electrical connection
Faulty Driving Support ECU Assembly

How to Fix the DTC C1A4A 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1A4A 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.

Need more information about the C1A4A Lexus code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1A4A Lexus Code

1. What does the OBDII code C1A4A mean on a Lexus?

The C1A4A code indicates an issue with the skid control buzzer circuit, which is part of the vehicle's ABS and stability control system.

2. What are the symptoms of the C1A4A code in a Lexus?

Common symptoms include the ABS or traction control warning light illuminating, absence of skid control buzzer sounds, and potential loss of stability control functionality.

3. What causes the C1A4A code to appear?

The most common causes include a faulty skid control buzzer, damaged wiring or connectors in the buzzer circuit, or a malfunctioning ABS control module.

4. Can I still drive my Lexus with the C1A4A code?

While the vehicle may still be drivable, the stability control system might not function properly, increasing the risk of losing traction in slippery conditions.

5. How do I diagnose the C1A4A code in a Lexus?

Start by inspecting the skid control buzzer, its wiring, and connectors for damage. Use a diagnostic scanner to check for related codes and test the ABS control module if needed.

6. How much does it cost to repair the C1A4A code on a Lexus?

Repair costs vary depending on the issue, but replacing a faulty skid control buzzer typically costs $50-$150, while complex wiring or module repairs may exceed $500.

7. Can a blown fuse cause the C1A4A code?

Yes, a blown fuse in the ABS or skid control circuit can interrupt power to the buzzer and trigger the C1A4A code.

8. How do I reset the C1A4A code after repairs?

After addressing the issue, use an OBDII scanner to clear the code. If the issue is resolved, the code should not return.

9. What should I do if the C1A4A code keeps coming back?

If the code reappears, recheck the wiring, connectors, and skid control buzzer for missed issues, or have the ABS control module tested by a professional.

10. Is the C1A4A code specific to Lexus vehicles?

While the C1A4A code is commonly associated with Lexus models, it may also appear in some Toyota vehicles with similar ABS and stability control systems.