2021-2024 Audi Airbag Warning Light TSB 2072911/1

Audi has issued Technical Service Bulletin (TSB) 2072911/1 to provide guidance for diagnosing and resolving an illuminated airbag warning light in several 2021-2024 Audi models. This TSB helps technicians identify the root cause when the "airbag warning light on" message appears, particularly when specific crash sensor-related fault codes are stored in the vehicle's airbag control module.

The TSB emphasizes that components are often in working order, directing technicians to investigate the vehicle's wiring system before considering crash sensor replacement. This approach aims to ensure accurate repairs and prevent unnecessary part replacements when an Audi airbag warning light is illuminated.

Symptoms

Owners may notice the following symptom:

• The "airbag warning light on" is illuminated on the instrument cluster.

Fault Codes / DTCs

When the Audi airbag warning light is active, one or more of the following Diagnostic Trouble Codes (DTCs) may be stored in the airbag control module, -J234- (address word 0015):

Code	Description
B101713	Driver side airbag crash sensor Interruption
B101813	Driver side: rear side airbag crash sensor Interruption
B103613	Passenger side airbag crash sensor, open circuit
B101904	Passenger side: rear airbag crash sensor, open circuit

Diagnosis / Trigger Conditions

The technical background for this issue indicates that the crash sensors themselves are often functioning correctly. Instead, the problem frequently lies within the vehicle's electrical system. Technicians are advised to thoroughly inspect the door wiring harness, the door coupling point, and the electrical connectors for the individual components associated with the stored DTCs.

Key diagnostic steps include carefully checking for any kinks in the wiring harness and ensuring that all pins are correctly positioned and properly engaged at both the door coupling point and the crash sensor connector. Technicians may also attempt to reproduce the complaint by manipulating the door, wiring harness, connectors, and pins. If, after these checks, the fault can definitively be traced to a crash sensor, then replacement of the crash sensor is recommended.

Repair Procedure Summary

The repair procedure outlined in TSB 2072911/1 focuses on a detailed inspection of the wiring and connectors related to the airbag system. Technicians will perform the following steps:

1. Wiring and Connector Inspection: A comprehensive check of the door wiring harness, the door coupling point, and the electrical connectors for the components linked to the specific DTCs stored in the airbag control module (-J234-). This includes looking for kinks in the wiring and verifying proper pin engagement.
2. Fault Reproduction: Attempting to reproduce the "Audi airbag warning light" symptom by moving the door, wiring harness, connectors, and pins. This helps confirm if the issue is intermittent or related to physical movement.
3. Crash Sensor Replacement (If Necessary): Only if the complaint is definitively traced to a faulty crash sensor after thorough wiring and connector checks, will the crash sensor be replaced.

Required Tools or Parts

To perform the diagnostic and repair procedures for this issue, technicians will require specific tools:

• VAS 6160/VAS 6150: A VAS tester equipped with the current version of ODIS (Windows 10) diagnostic software.

Important Warnings

Owners should be aware of the following:

• "If the vehicle is outside of any warranty, this Technical Service Bulletin is informational only." This means that if your vehicle is no longer under warranty, any diagnostic or repair costs may be your responsibility.
• The TSB emphasizes checking the vehicle's wiring system thoroughly before replacing crash sensors, as components are often in working order. This can prevent unnecessary part replacements.

Owner Action

If your 2021-2024 Audi is displaying an "airbag warning light on" message, it is recommended to schedule an appointment with an authorized Audi dealership. Provide them with details about the symptom and any specific fault codes you may have observed. The dealership technicians will use TSB 2072911/1 to diagnose the issue and perform the necessary repairs, which may involve inspecting and repairing wiring or, if necessary, replacing a crash sensor.

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Source: NHTSA ID: 10250319