Airbag-Steuergerät mit der Teilenummer 628629500A

What is the function of the airbag control unit 628629500A?

The airbag control unit with part number 628629500A is the central control unit of the occupant restraint system (SRS) in the Nissan Altima U13. It continuously analyzes data from the acceleration sensors and, in the event of a crash, determines whether and which restraint systems—such as airbags or seatbelt pretensioners—should be deployed to protect the occupants.

As the “brain” of the safety system, this control unit reliably detects collisions and, within milliseconds, sends the appropriate commands to activate the pyrotechnic charges. It also continuously monitors all components of the airbag system, from the sensors and wiring to the airbag modules themselves.

In case of a malfunction or defect in the system, the control unit ensures that the airbag warning light (SRS lamp) illuminates on the instrument panel, alerting the driver to a potential safety risk. Without a properly functioning control unit, the vehicle’s passive safety can no longer be guaranteed.

Why does the control unit 628629500A fail?

The most common cause of failure for the control unit 628629500A is the storage of crash data after an accident. This data irreversibly locks the module, preventing further use. Additional defects arise from age-related wear of hardware components such as capacitors or memory chips on the circuit board.

After a collision in which the airbags have deployed, the control unit creates what is known as a “crash lock.” This entry is permanent and cannot be erased using conventional diagnostic tools. The module must be professionally reset to resume its functions.

Besides crash data, internal hardware defects are also a frequent source of failure. Over time, electronic components on the circuit board may fail due to temperature fluctuations and vibrations, leading to internal malfunctions that prevent the entire SRS system from operating correctly. Less commonly, mechanical damage to the housing or connectors can also be the root cause.

How do you recognize a defect in the control unit 628629500A?

A defect in the control unit 628629500A primarily manifests as the airbag warning light remaining constantly illuminated on the dashboard. Often, the unit can no longer be accessed by a diagnostic tool, or the specific error code B1111 (control unit defective) is stored in the fault memory. These symptoms indicate either an internal defect or locked crash data.

The clearest sign is the persistently lit SRS warning light, which does not extinguish even after restarting the engine. This alerts the driver that the entire restraint system is deactivated and would not deploy in the event of a crash.

Another clear indication is the lack of communication with the control unit. If the workshop’s diagnostic equipment cannot access the airbag module, this strongly suggests a serious internal fault. Sometimes, implausible error codes are even recorded for intact components, such as the side impact sensors.

Important practical note: Before removing the control unit, a specialized workshop should always inspect the wiring and connectors. In particular, the connectors beneath the front seats are a well-known weak point that can produce similar symptoms due to contact issues. Often, the problem can already be resolved with a simple cable repair.

In which vehicles is the control unit 628629500A installed?

The airbag control unit with part number 628629500A is specifically designed for models from the Japanese manufacturer Nissan. It is mainly used in the Nissan Altima U13 series, produced during the 1990s. Similar control units can also be found in other Nissan models from that era, such as the Almera.

At Airbag24, we repair part number 628629500A for the following specific models:

Nissan Altima U13 (model years 1992–1995)

Nissan Altima U13 Facelift (model years 1995–1997)

Since vehicle manufacturers often use modular systems, components can sometimes be compatible across different models. However, repairs are tailored to ensure the exact functionality of part number 628629500A, guaranteeing full compatibility and safety.

How is the control unit 628629500A professionally repaired?

Professional repair at Airbag24 begins with removing the unit and sending it to our technical department. There, a precise diagnosis is performed to distinguish between a software issue (crash data) and a hardware defect. Subsequently, the crash data is erased, and any defective components on the circuit board are replaced. After a successful final test, the unit is returned with a 12-month warranty.

The process at Airbag24 is standardized to ensure the highest quality. First, the control unit is removed from the vehicle. In the Nissan Altima U13, it is typically located in the center console beneath the handbrake lever. Removal should be performed by a qualified technician to avoid damage to connectors or cables.

After sending it to Airbag24, our technicians conduct an incoming inspection. Using specialized equipment, they read out the fault memory and analyze the hardware. Depending on the findings, repair proceeds as follows:

Clearing crash data: Using innovative software technology, all crash data stored in the memory is completely erased, restoring the control unit to its factory settings.

Hardware repair: If components such as capacitors or memory chips are defective, these are professionally replaced on the circuit board.

Following restoration, each control unit undergoes an extensive functional test. Only after passing this test is it approved for return shipment. After reinstalling the unit in the vehicle, all error codes must finally be cleared using an OBD2 diagnostic tool.

What are the benefits of repairing 628629500A?

Repairing the original control unit is the most economical and technically sensible solution. You can save up to 70% compared to purchasing an expensive new part directly from the manufacturer. Since the vehicle-specific coding is preserved, there’s no need for time-consuming reprogramming after installation. Thus, repair offers a true plug-and-play solution.

A new part for the Nissan Altima can quickly cost several hundred euros, whereas repair provides a significantly more affordable alternative. You receive a fully functional component that meets the specifications of a brand-new unit.

The key technical advantage lies in preserving the original coding. The control unit is precisely matched to your vehicle’s configuration. With a replacement unit—even one bearing the same part number—reprogramming would often be required. Repair eliminates this step entirely.

Moreover, you’re contributing to sustainability by reusing valuable electronic components. We offer a 12-month warranty on every repaired unit.

What shipping options does Airbag24 provide?

To ensure smooth processing, Airbag24 offers flexible shipping options. You can either send your defective control unit yourself free of charge or arrange convenient UPS pickup at your preferred location. For return shipments, you have access to free standard UPS shipping as well as faster UPS Express delivery, both available with cash-on-delivery if desired.

For outbound shipping, you have two choices: either pack the component securely and send it to us yourself, or take advantage of our convenient pickup service. Simply book online for UPS pickup, and a courier will come directly to your home or workshop.

Once the repair is complete, you can choose from the following return shipping options:

Free standard UPS shipping (typically delivered within 1–3 business days)

UPS Express shipping (typically delivered within 1–2 business days)

Both standard and express options can also be booked with cash-on-delivery. Alternatively, upon prior arrangement, you may pick up the repaired control unit directly from our facility.