B100BDriver side (thorax) airbag igniter circuit

• Volkswagen group code · Airbag (SRS)
• Lights a warning lamp

How the car detects it

The airbag unit measured a fault in this firing circuit. The failure-type byte says which: resistance too high (most often a loose connector or a broken wire), too low, or a short circuit. This airbag sits in the seat backrest. Volkswagen and Audi bulletins trace high resistance here to the seat harness and its connector being pushed around by the seat foam. While an airbag fault is stored, the affected airbag or pretensioner may not deploy in a crash. Have it repaired before relying on it. Never probe airbag connectors with a meter: that can fire the airbag.

What you may notice

• Airbag warning light

Likely causes

• PossibleSeat wiring harness or connector under the seat
• RareSide airbag module

Sources

• static.nhtsa.gov › MC-10211688-0001.pdf · official document
• static.nhtsa.gov › MC-10247497-0001.pdf · official document

Backed by an official manufacturer document.

From Obdaryn's Volkswagen group pack, exactly as the app shows it, with the public sources above. Guidance only; confirm with a workshop.