What is a Porsche 911 991 airbag control unit?
The Porsche 911 991 airbag control unit is the central safety unit responsible for activating all passive occupant restraint systems in the vehicle in the event of an accident. It continuously monitors sensor data, stores important crash information, and ensures the correct and precise deployment of all airbag modules and seatbelt pretensioners to provide maximum safety.
This safety-relevant electronic module controls the deployment of airbags and seatbelt pretensioners. It processes signals from various crash sensors in real time.
After an accident, the control unit stores relevant crash data. This data must be erased by a specialist workshop before the system can be restarted.
The control units are an integral part of the passive safety system and work closely with other components such as belt tensioners and airbag modules.
Why is the Porsche 911 R 991 airbag control unit defective?
A Porsche 911 R 991 airbag control unit is often defective because it stores crash data after an accident, which blocks the system and necessitates repair. Internal electronic errors, software corruption, or overvoltage can also cause a failure, requiring a comprehensive diagnosis and professional Porsche 911 R 991 airbag control unit repair.
Because crash data is stored in the memory module, the airbag warning light remains permanently illuminated. This prevents the airbag system from functioning properly.
Furthermore, internal hardware defects or water damage can impair functionality. Such damage requires specialized knowledge to repair a defective control unit.
Faulty communication in the vehicle electrical system or implausible sensor signals can also lead to failure. This often manifests itself in specific error codes that indicate a defect and require precise diagnosis.
Common error codes for Porsche 911 R 991 airbag control unit repair
During Porsche 911 R 991 airbag control unit repairs, specific error codes such as C12184, B1000, 0404, or 2004 are often read out. These codes indicate a functional limitation, communication problems, or sensory malfunctions in the system that are directly attributable to the airbag control unit and require a precise diagnosis.
- C12184 → Functional restriction → Implausible signals from sensors or lines
- B1000 → Control unit communication error → CAN bus or internal communication fault
- 0404 → Thorax airbag driver side – resistance too high → Error in the side airbag on the driver side
- 2004 → Driver's side seat belt buckle – interruption → Signal interruption, read by the airbag ECU
What part numbers are available for the Porsche 911 R 991 airbag control unit repair?
For the Porsche 911 R 991 airbag control unit repair, the OEM part numbers 99161820108, 99161820104, 99161820103, and 99161820102 are relevant. These Bosch/Porsche genuine parts are designed specifically for the Porsche 911 series 991, ensure the correct functionality of the safety system, and are crucial for compatibility during repair.
These control units are designed for the Porsche 911 of the 991 series, built from approximately 2012 to 2017. They cover various variants such as the Carrera and Turbo.
The listed part numbers have been validated multiple times in official Porsche parts catalogs. They primarily come from the supplier Bosch and thus guarantee OEM quality for your control unit.
It's important to note that these numbers only apply to airbag control units. Other airbag components or models like the 997 are explicitly excluded.
- 99161820108
- 99161820104
- 99161820103
- 99161820102
Technical details and installation of the Porsche 911 R 991 airbag control unit
The Porsche 911 R 991 airbag control unit weighs approximately 1 kg and operates on a 12 V vehicle electrical system. It is located in the rear of the vehicle and requires professional coding and programming after a replacement or repair of the Porsche 911 R 991 airbag control unit. This must be done using specialized diagnostic equipment to ensure full system reliability.
The control unit is specifically designed for the Porsche 911 R, the 4.0-liter naturally aspirated model from 2016 to 2017. It is also compatible with other 991 variants such as the Carrera and Turbo, as well as the 981 Cayman.
The airbag control unit is typically located in the rear of the vehicle, often in the trunk. Its positioning is crucial for optimal communication with the crash sensors.
Installation and programming may only be performed by trained specialists. Failure to comply may result in malfunctions or unintentional airbag deployment, so please consult a specialized workshop.
The vehicle-specific software requires recoding after each intervention. This is necessary to correctly integrate the control unit into the vehicle network and prevent failure.