Audi A8 D4 airbag control unit repair

What is an Audi A8 D4 airbag control unit?

The Audi A8 D4 airbag control unit is the central safety unit that activates all occupant restraint systems, such as airbags and seatbelt pretensioners, in the event of an accident. It precisely monitors sensors in the vehicle, stores important crash data, and thus ensures the proper function and safety of the entire restraint system.

This microprocessor-based module is crucial for protecting vehicle occupants. It processes data from acceleration sensors and other safety systems in milliseconds. Proper functioning is essential for the operational safety of the Audi A8 D4.

Why is the Audi A8 D4 airbag control unit defective?

An Audi A8 D4 airbag control unit often malfunctions because it stores crash data after an accident, preventing reuse without a reset, or due to internal electronic damage. Voltage fluctuations or water damage can also lead to failures that require professional Audi A8 D4 airbag control unit repair.

After a collision, the control unit stores irreversible crash information, causing the airbag warning light to remain permanently active. Internal component defects, aging components, or faulty programming can also lead to malfunctions. In such cases, repairing or replacing the control unit is the only solution.

Common error codes for Audi A8 D4 airbag control unit repair

During Audi A8 D4 airbag control unit repairs, specific error codes occur that directly indicate problems with the module. These codes help specialized workshops identify the exact cause of the malfunction and initiate targeted measures to restore system functionality.

• 9451537 → Pedestrian protection trigger 1, short circuit to ground → Short circuit error in the trigger circuit of the control unit.
• 00588 → Driver side airbag igniter (N95) resistance too high or too low → Resistance deviations in the ignition circuit of the driver airbag signal.
• 01217 → Driver's side airbag igniter (N199) Error → Problem in the igniter circuit of the driver's side airbag.

These error codes are primarily associated with the control unit, not sensors or seatbelt pretensioners. Error codes related to crash data prevent simple memory erasure and indicate the need for professional Audi A8 D4 airbag control unit repair.

What part numbers are available for the Audi A8 D4 airbag control unit repair?

For a successful Audi A8 D4 airbag control unit repair, precise identification of the correct OEM part number is crucial. Different original numbers from Bosch and Audi ensure compatibility and guarantee correct function in the vehicle system after replacement or repair.

• 4H0 959 655 C → Manufacturer: Bosch → Type: Original OEM (Standard)
• 4H0 959 655 B → Manufacturer: Bosch → Type: Original OEM (older version)
• 4H0 959 655 → Manufacturer: Bosch → Type: Original OEM (basic variant)
• 4H0 907 553 E → Manufacturer: Audi → Type: Original OEM
• 4H0 907 553 → Manufacturer: Audi → Type: Original OEM (Base)
• 4E0 959 655 A → Manufacturer: Bosch → Type: Original OEM (earlier A8 model)
• 4H0 907 637 → Manufacturer: Bosch → Type: Original OEM

These verified OEM part numbers are designed specifically for the airbag control unit of the Audi A8 Type D4 (4H). A replacement module typically requires specific programming to the vehicle's VIN (vehicle identification number). This ensures complete compatibility and functionality of the system and is an important step in the Audi A8 D4 airbag control unit repair.