Airbag control unit with part number 441570500

What is the function of the airbag control unit 441570500?

The Bosch airbag control unit with part number 441570500 is the central control module for the occupant protection system (SRS) in the Audi S8 D4. It processes signals from crash sensors and is responsible for precisely and reliably deploying the airbags and seatbelt pretensioners in the event of a collision.

As the heart of the Supplemental Restraint System (SRS), this unit continuously monitors all connected components of the safety system. It is technically identical to or compatible with Audi part numbers 4H0907553E and 4H0907553.

The primary task of the control unit is to analyze data from acceleration and pressure sensors in real time. When an impact exceeds predefined thresholds, it sends ignition pulses to the corresponding airbag modules and seatbelt pretensioners to provide optimal protection for occupants.

Why does the control unit 441570500 fail?

The most common cause of failure for control unit 441570500 is the storage of crash data after an accident, which locks the system. Other typical defects include electronic malfunctions caused by overvoltage, water damage, or physical damage to wiring and connectors.

Following a collision, the control unit stores non-erasable crash event data. This permanent lock is a manufacturer‑imposed safety feature that prevents reuse without professional inspection and repair.

Electronic components on the circuit board can be damaged by moisture (water ingress) or voltage spikes in the vehicle’s electrical system. These often result in internal hardware failures that prevent communication with the unit.

Mechanical factors such as broken wires, corroded connectors, or faults in the CAN bus system can also impair the control unit’s functionality and lead to total failure of the airbag system.

How do you recognize a defect in 441570500?

A defect in the airbag control unit 441570500 primarily manifests as a permanently illuminated or flashing SRS airbag warning light on the instrument cluster. Often, no communication with the control unit can be established using a diagnostic tool, or internal, non‑erasable fault codes are displayed.

The most noticeable sign is the active airbag warning lamp, indicating that the entire restraint system is disabled and will not provide protection in the event of a crash. Immediate inspection at a workshop is therefore essential.

During diagnostics at the workshop, it is frequently found that the control unit is unresponsive. Diagnostic tools receive no response, often accompanied by error codes such as B1000 or 65535 (control unit defective).

Another clear symptom is the presence of an internal control unit fault, such as error code 93F9 in comparable models. Messages indicating excessively high resistance in an airbag ignition circuit or a blocked fuel shut-off valve may also point to a defect within the control unit.

In which vehicles is 441570500 installed?

The Bosch airbag control unit with part number 441570500 is specifically designed for the Audi S8 of the D4 generation. It is used in both the original models and the facelifted version of this vehicle and plays a crucial role in its safety system.

At Airbag24, we repair part number 441570500 for the following models:

• Audi S8 D4 (model years 2012–2013)

• Audi S8 D4 Facelift (model years 2013–2017)

Is repairing 441570500 worthwhile?

Yes, repair is the most economical and technically sensible solution. It is significantly cheaper than a new unit, which can cost up to €1,000, and avoids the complex coding issues associated with used control units.

A key advantage of repair is the substantial cost savings compared to purchasing a brand‑new control unit directly from the manufacturer. The repair restores full functionality without placing a heavy burden on your budget.

Unlike a used replacement part that must be precisely programmed for your vehicle, the repaired original unit retains its original coding. This makes reinstallation simple and hassle‑free—just install, clear the fault codes, and the system is back in operation.

Professional refurbishment by specialists also ensures the safety and reliability of the airbag system. In contrast to inexpensive aftermarket parts of unclear origin, this repair comes with a 12‑month warranty, underscoring its durability.

How is 441570500 professionally repaired?

Professional repair at Airbag24 includes a systematic analysis of the submitted control unit, erasure of stored crash data, and replacement of defective electronic components. Since the original coding is preserved, no re‑learning is required after installation.

After being sent to Airbag24, the control unit undergoes a thorough inspection by experienced technicians. First, the fault memory is read out to pinpoint the exact cause of the defect—whether it’s a hardware failure or a crash-data lockout.

The repair process focuses on resolving the identified issues. This includes safely erasing crash data, repairing overvoltage damage, and replacing any damaged components on the circuit board.

Since vehicle-specific coding is fully preserved during repair, the control unit functions immediately upon reinstallation (plug-and-play). We provide a 12-month warranty on every repair.

What shipping options are available?

You can either send your defective control unit to us free of charge yourself or arrange a convenient UPS pickup. For returning the repaired unit, Airbag24 offers free standard UPS shipping, as well as faster express and cash-on-delivery options for maximum flexibility.

For the outbound shipment, you have two convenient choices: you can ship the package to us yourself or request a UPS pickup at your preferred location.

Once the repair is complete, the following return shipping options are available:

• Free standard UPS shipping

• UPS express shipping

• Standard UPS shipping with cash on delivery

• Express UPS shipping with cash on delivery

• In-person self-collection