2019-2025 Audi Seat Belt and Pre Sense Warning TSB

Audi has released Technical Service Bulletin (TSB) 69 24 16 2056421/9 to address intermittent "Seat belt and pre sense warnings" that may appear while driving. This issue is typically accompanied by the diagnostic trouble code (DTC) B101C07 being stored in the airbag module. This TSB supersedes previous bulletin 24-07, dated February 23, 2024, for reasons listed in the document.

This bulletin applies to various Audi models from 2019 through 2025, including the Audi e-tron, and aims to clarify the cause and resolution for this specific warning.

Symptoms

Owners may observe that the "Seat belt and pre sense warnings appear intermittently while driving". Additionally, a "pre sense warning also appears in the instrument cluster." These warnings indicate a potential issue with the seat belt system or its interaction with the vehicle's pre sense safety features. If you are experiencing an Audi e-tron B101C07 fault, these are the typical indicators.

Fault Codes / DTCs

When these warnings occur, the airbag control unit (diagnostic address 0015) will log the following diagnostic trouble code:

• B101C07: "Driver seat belt switch mechanical malfunction, static"

Diagnosis and Trigger Conditions

The DTC B101C07 is set if the airbag control unit does not detect a change in the seat belt status over five consecutive driving cycles. This condition can arise from several scenarios, often related to improper seat belt usage.

One common cause is the use of a 'belt dummy', which is a latch plate inserted into the belt buckle. Its purpose is to suppress the visual and acoustic warnings that are triggered by the belt-fastened sensor when the seat belt is not properly fastened. The same symptom can occur if the driver inserts the seat belt into the buckle but then sits on top of the fastened belt, effectively not wearing it. Another variant is if the front passenger's seat belt is inserted into the driver's belt buckle.

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