2021-2024 Audi Q5/SQ5 Airbag Warning Light On TSB

Symptoms of an Airbag System Fault

Owners of 2021-2024 Audi Q5, Q5 e quattro, Q5 Sportback, SQ5, and SQ5 Sportback vehicles may observe the Audi Q5 airbag warning light illuminated on their dashboard. This indicates a potential issue with the vehicle's airbag system, which is critical for occupant safety.

Fault Codes / DTCs

When the Audi Q5 airbag warning light is active, a diagnostic scan of the airbag control module (-J234-, address word 0015) will likely reveal the following Diagnostic Trouble Code (DTC):

• DTC B120E1B: driver airbag release valve igniter Resistance too high

This specific fault code points to an electrical resistance issue within the driver's airbag system.

Diagnosis and Trigger Conditions

Audi Technical Service Bulletin 2072023/2 identifies the root cause of the "driver airbag release valve igniter Resistance too high" fault. The problem stems from non-optimal wiring routing within the driver airbag assembly. This improper routing creates tension on the release valve connector. Over time, and especially during vehicle vibrations, this tension can lead to an increase in electrical resistance at the connector, causing the system to log an event memory entry and illuminate the Audi Q5 airbag warning light.

Repair Procedure Summary

To address the DTC B120E1B and resolve the Audi Q5 airbag warning light issue, Audi service technicians follow a specific procedure outlined in TSB 2072023/2:

1. Driver Airbag Removal: The first step involves carefully removing the driver airbag unit from the steering wheel.
2. Wiring Inspection: Technicians then thoroughly check the routing of the wiring inside the driver airbag, paying close attention to the area around the release valve. Visual aids (Figures 1 and 2 in the TSB) guide this inspection to identify areas where tension might be applied to the wiring.
3. Wiring Harness Replacement and Rerouting: The airbag wiring harness is replaced. Crucially, the new wiring must be routed in a manner that prevents any tension from being created on the release valve connector. This ensures the electrical connection remains stable and prevents recurrence of the resistance issue.

Important Warnings and Notes

Audi specifies important conditions regarding this service bulletin:

• Warranty Coverage: If your vehicle is outside of its warranty period, this Technical Service Bulletin is for informational purposes only, meaning the repair may not be covered free of charge.
• Documentation for Billing: When submitting a claim for this repair, technicians are required to attach a photo clearly showing the complaint to Doc-It. This photo must include the vehicle's VIN number and the date to ensure proper reference. The photo should be in focus, well-illuminated, and should not show any persons, faces, vehicle registration numbers, or customer data.

Owner Action

If your 2021-2024 Audi Q5, Q5 e quattro, Q5 Sportback, SQ5, or SQ5 Sportback is displaying the Audi Q5 airbag warning light or has stored DTC B120E1B, it is recommended to schedule an appointment with an authorized Audi service center. They will be able to diagnose the issue accurately using the information provided in Technical Service Bulletin 2072023/2 and perform the necessary repair to ensure the proper function of your vehicle's airbag system.

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Source: NHTSA ID: 11011266