2019-2022 Audi High Beam Assist and Traffic Sign Detection Fault

Owners of various 2019-2022 Audi models may encounter dashboard warnings related to their vehicle's advanced driver-assistance systems. Specifically, the "High beam assist currently not available. Camera view restricted because of environmental factors." and "Traffic sign detection: currently not available. Camera view restricted because of environmental factors." messages can appear, often accompanied by the diagnostic trouble code (DTC) C12B3FD. This issue, addressed by Audi Technical Service Bulletin (TSB) 2059201/4, points to a temporary obstruction of the front camera's view.

Symptoms

Owners typically notice these warnings appearing in the instrument cluster, most often right after the vehicle is started. The messages clearly indicate a problem with the camera's ability to see its surroundings, which directly impacts the performance of the high beam assist and traffic sign detection features. If you experience an Audi high beam assist C12B3FD fault, it's usually due to this camera restriction.

The specific messages are:

• "High beam assist currently not available. Camera view restricted because of environmental factors."
• "Traffic sign detection: currently not available. Camera view restricted because of environmental factors."

Fault Codes / DTCs

When the front camera for driver assist systems control module (J1121, address word 00A5) detects a visibility restriction for more than 77 seconds, it logs a specific diagnostic trouble code. For most affected Audi vehicles, this will be:

Code	Description	Module	Symptom Code
C12B3FD	Front camera for driver assist systems - temporary view restriction	J1121 (Front camera for driver assist systems control module)	221284

It's important to note that for Audi A3 models, a DTC may not be stored even if the warning messages appear.

Diagnosis / Trigger Conditions

The core of this issue is a temporary visibility restriction of the front camera. This restriction can be caused by environmental factors such as fogging on the inside or outside of the camera's viewing area. Audi explains that the camera module includes a heating element designed to prevent fogging and maintain clear visibility. This heating element activates automatically at low temperatures or when restricted visibility is detected.

The system logs the DTC C12B3FD when the camera's view is obstructed for more than 77 seconds. Once the visibility is restored, the warning messages disappear, and the systems become available again. The DTC then becomes sporadic.

Repair Procedure Summary

This TSB outlines a straightforward approach to addressing the Audi high beam assist C12B3FD issue, primarily focusing on ensuring the front camera's viewing area is clear.

1. Educate the Customer: Technicians should explain how the camera's heating element works to maintain clear visibility.
2. Inspect Camera Viewing Area: Customers are advised to visually inspect the viewing area of the front camera the next time the message appears. The camera's viewing area can fog up from both the inside and outside. Figures 1 and 2 in the TSB illustrate examples of the viewing area fogged from the outside and inside, respectively.
3. Initial Resolution: Often, simply activating the vehicle's wiper system can clear external fogging or debris, resolving the concern. Owners cannot typically see the camera's viewing area from inside the vehicle.
4. Internal Fogging Solution: If the front camera frequently fogs up from the inside, the technician may need to remove the camera's lens hood. Following removal, the viewing area of the camera should be thoroughly cleaned and dried to prevent recurrence.

There is no "production solution" or software update noted for this particular issue, indicating it's primarily a maintenance and environmental factor.

Warranty Information

This service bulletin provides specific guidelines for warranty claims related to the Audi high beam assist C12B3FD problem:

• Claim Type: Covered for vehicles up to 48 months or 50,000 miles. Certified Pre-Owned (CPO) vehicles also qualify under G10 claim type, requiring owner verification.
• Out of Warranty: If the vehicle is outside the warranty period, this bulletin serves as informational guidance only.
• Service Number: 9638
• Damage Code: 0010
• Labor Operations:
  • Remove and install camera for assistance systems (lens hood): 9638 1999 (20 TU)
  • Clean and dry windscreen: 6410 2999 (10 TU)
• Diagnostic Time: GFF (0150 0000), with a maximum of 25 TU as stated on the diagnostic protocol.
• Road Test: 0 TU for both pre-service (0121 0002) and post-service (0121 0004) road tests.
• Claim Comment: "As per TSB #2059201/4"

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review and audit by Audi Warranty.

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NHTSA ID: 10189151