Airbag control unit with part number 4079330620

What is the function of the airbag control unit 4079330620?

The airbag control unit with part number 4079330620 is the central control module of the occupant restraint system (SRS) for the Nissan Primera P10. It processes signals from crash sensors to deploy airbags and seatbelt pretensioners in the event of a collision, ensuring the safety of vehicle occupants.

This control unit, also known as the SRS Control Unit, is specifically designed for the Nissan Primera P10 models from 1990 to 1995, as well as for the facelifted model from 1995 to 1997. It serves as the brain of the entire restraint system, making split-second decisions to activate safety components.

Technically, it is compatible with alternative part numbers such as 985841J010 or 4798208800. The primary task of this device is continuous monitoring of all connected sensors and actuators to ensure flawless operation in critical situations.

Why does the control unit 4079330620 fail?

The most common causes of failure for the control unit 4079330620 are stored crash data following an accident, which locks the unit, as well as internal electronic malfunctions. These include defective components such as capacitors or microprocessors, and especially in P10 models, damage caused by moisture ingress.

A primary reason for failure is the storage of crash data. After a collision, the control unit self‑locks for safety reasons and deactivates the airbags. This lock can only be released through specialized repair work that erases the data stored in its internal memory.

In addition, purely electronic faults lead to device malfunction. Internal short circuits, overvoltage damage, or age‑related component failure on the circuit board are typical issues. Particularly in the Nissan Primera P10, leaking trunk seals can allow moisture to enter, causing corrosion or ground shorts on the control unit and impairing its functionality.

Such hardware defects often manifest as specific diagnostic trouble codes like B1000 (control unit fault), B1054, or B1059, which can be read during diagnostics.

How do you recognize a defect in the control unit 4079330620?

A defect in the control unit 4079330620 usually becomes apparent through a permanently illuminated or flashing SRS warning light on the instrument cluster. Other clear indicators include loss of communication with diagnostic tools or the presence of specific error codes pointing to an internal fault.

The most obvious symptom is the active airbag warning light. If this light remains on continuously, the system indicates a fault and the airbags are deactivated. This poses a significant safety risk and requires immediate inspection at a qualified workshop.

Another frequent sign is complete loss of communication. When a workshop attempts to read the control unit via the OBD interface, the connection fails. The unit no longer responds to diagnostic requests, suggesting a severe internal hardware failure.

If the fault memory can still be accessed, codes such as B1000 (control unit fault) directly indicate a malfunction of the control module. For P10 models, it’s important to note that ABS and airbag systems are separate, and reading the memory without specialized equipment is often impossible.

In which vehicles is the control unit 4079330620 installed?

The airbag control unit with part number 4079330620 is specifically designed for the first-generation Nissan Primera (P10). At Airbag24, we repair this control unit for the following models and production periods to restore full functionality of the safety system.

At Airbag24, we service part number 4079330620 for these models:

Nissan Primera P10 (1990–1995)

Nissan Primera P10 Facelift (1995–1997)

How is the control unit 4079330620 professionally repaired?

At Airbag24, repairing the control unit 4079330620 follows a standardized process. This includes precise diagnostics, replacement of faulty components at the component level, deletion of crash data, and a final functional test on a vehicle simulator to ensure full safety.

After submission to Airbag24, the control unit undergoes a thorough visual and electronic inspection. Our technicians examine the circuit board for visible damage such as corrosion or broken traces and read the internal fault memory to pinpoint the exact cause.

The next step involves component-level repairs. Defective parts like capacitors, resistors, or microprocessors are carefully desoldered and replaced with new, high‑quality components. If applicable, any stored crash data is completely erased from the control unit’s memory.

Subsequently, the repaired control unit is tested on a specialized test bench. This bench simulates all signals and loads as they occur in the vehicle, ensuring correct functionality under real-world conditions. Only after a successful test is the unit approved for return shipment. We provide a 12-month warranty on every repair.

What shipping options does Airbag24 offer?

Airbag24 provides flexible and secure shipping solutions. You can send your defective control unit to us free of charge or arrange a convenient UPS pickup. For return shipments, we offer free standard UPS shipping as well as faster express options, including cash-on-delivery.

For the outbound shipment, you have two convenient choices: Send the package yourself—shipping is free—or use our UPS pickup service, which collects the package directly from your preferred location.

For returning the repaired control unit, we offer the following options:

Free standard UPS shipping (delivery in 1–3 business days)

UPS express shipping (delivery in 1–2 business days)

Standard UPS shipping with cash-on-delivery

Express UPS shipping with cash-on-delivery

In addition, personal collection at our premises is also available.