2023-2025 Audi Lane Departure Warning Activates on Startup TSB

Owners of certain 2023-2025 Audi models may notice that their lane departure warning system activates automatically upon vehicle startup, even if it was previously deactivated. This behavior, where the Audi lane departure warning startup occurs unexpectedly, is addressed in Audi Technical Service Bulletin (TSB) 2073280/1, issued on May 16, 2024.

This TSB clarifies that the sporadic activation of the lane departure warning system is not a fault requiring repair, but rather a characteristic related to the vehicle's startup timing. It typically happens after the vehicle has been in a 'bus-sleep' state for several minutes.

Symptoms

Owners report the "lane departure warning system sporadically activates by itself on vehicle start-up, despite not having been active in the prior drive cycle." This condition is often observed when the vehicle has been parked for several minutes, allowing it to enter a 'bus-sleep' state. When the system activates, the "lane assist symbol in the instrument cluster" will be visible. This symbol, as depicted in Figure 1 of the TSB, typically shows two parallel lines with a vehicle icon, indicating the system is active and monitoring lane markings.

Fault Codes / DTCs

Audi TSB 2073280/1 explicitly states that "No Relevant DTCs are stored" in connection with this condition. This means technicians will not find any diagnostic trouble codes indicating a malfunction related to the lane departure warning system's sporadic activation.

Technical Background

The root cause of the Audi lane departure warning startup behavior is attributed to the vehicle's startup timing. Due to this specific timing sequence, the lane assist activation is not suppressed from activating after the vehicle has been in a bus-sleep state. This means that even if the driver had previously turned off the system during the last drive cycle, it might reactivate upon the next startup if the vehicle had been off for a sufficient period to enter bus-sleep. Audi considers this a normal operational characteristic rather than a defect requiring a software update or component replacement.

Important Warnings for Owners

Audi has provided clear instructions regarding this condition:

• "Do not perform any repairs. Any repairs for this concern may be denied."
• "Instruct the customer that this condition is normal."
• "This TSB is informational only and not applicable to any Audi Warranty."

This means that owners should not seek repairs for this specific behavior, as it is considered normal and will not be covered under warranty. Dealers are instructed not to perform any repairs.

Workarounds for Lane Departure Warning Activation

While no repair is needed because the condition is considered normal, owners can easily deactivate the lane departure warning system if it activates unexpectedly after an Audi lane departure warning startup:

1. Using the Steering Column Stalk Button: The system can be quickly deactivated by long-pressing the lane keeping button located on the turn signal stalk for more than four seconds. This button, illustrated in Figure 2 of the TSB, is typically marked with a lane assist symbol, providing a direct and convenient way to manage the system's status.
2. Via the MMI Driver Assist Settings: In many Audi models, the lane departure warning system can also be deactivated through the vehicle's infotainment system. Owners can navigate to the driver assist setting menu within the MMI (Multi Media Interface) and select the option labeled "Lane Departure Warning" to toggle its status on or off. This method offers a more permanent deactivation if desired, though the system may still reactivate under the described startup conditions.

NHTSA ID: 11002150