What is an Audi RS4 B9 airbag control unit?
The Audi RS4 B9 airbag control unit is the central safety unit in the vehicle, precisely activating all occupant restraint systems such as airbags and seatbelt pretensioners in the event of an accident. It continuously monitors a multitude of sensors, stores relevant crash data, and ensures the proper functioning of all passive safety elements in the vehicle.
This safety-relevant component is responsible for recording accident events.
It communicates with other vehicle systems via the CAN bus.
Why is the Audi RS4 B9 airbag control unit defective?
An Audi RS4 B9 airbag control unit is often defective because crash data is irretrievably stored in the unit after an accident, resulting in the system being locked. Internal component defects or communication errors in the vehicle data bus can also lead to failure or error messages that require repair.
After an airbag is deployed, the stored crash data block further function.
Internal electronic damage can also cause the control unit to fail.
Faults in the wiring or CAN bus can cause communication problems.
Common error codes for Audi RS4 B9 airbag control unit repair
During an Audi RS4 B9 airbag control unit repair, specific error codes may occur that indicate problems with the unit itself or its communication. These codes often signal a defect in the internal components, difficulties with data transmission, or problems with the connected ignition systems that require a detailed diagnosis.
- B1000 → Control unit communication error → No connection to the airbag ECU possible.
- 00588 → Driver side airbag squib (N95) resistance too high/low → Defective control unit or wiring problem to the squib.
- B200000 → Control unit component defective → Internal hardware error in the airbag control unit.
- U1123 00 → Error message received in the data bus → Faulty communication in the vehicle network with the airbag control unit.
- B13BC → Intermittent fault in the airbag control unit → Sporadic databus problems or internal failures.
These error codes are typical for defects in the airbag control unit of the Audi RS4 B9.
A precise diagnosis with a suitable tool is essential for repair.
What part numbers are available for the Audi RS4 B9 airbag control unit repair?
For Audi RS4 B9 airbag control unit repairs, only specific and verified OEM part numbers are used to ensure full compatibility and safety. These part numbers ensure that the replacement or repaired control unit is precisely tailored to the vehicle model and interacts correctly with all safety systems of the Audi RS4 B9.
The primary OEM part number for the Audi RS4 B9 airbag control unit is 8W0 959 655.
A commonly compatible alternative OEM part number is 8W0959655A, which is used within the same model range.
These numbers come from original equipment manufacturers such as Bosch, a typical supplier of Audi airbag systems.
Only these part numbers guarantee a safe and effective Audi RS4 B9 airbag control unit repair or replacement.