Airbag control unit with part number 8200748155

What is the function of the airbag control unit 8200748155?

The airbag control unit with part number 8200748155 is the central control module for the occupant safety system (SRS) in the Dacia Logan II. It processes signals from crash sensors and, in the event of a collision, precisely deploys the airbags and activates the seatbelt pretensioners. This component is also known under the reference numbers 985102122R and 985106332R.

During normal driving, the SRS ECU continuously monitors all connected safety components. In the event of a collision, it analyzes incoming data from acceleration and pressure sensors within milliseconds to assess the severity of the impact and activate the appropriate restraint systems.

In addition to its primary part numbers, this control unit is technically related to parts 8201163278, 285001650, and 8200307188, indicating a shared technical foundation or compatibility across certain vehicle platforms.

Why does the control unit 8200748155 fail?

The most common cause of failure is the storage of crash data after an accident, which results in a hardware-based lockout of the device. Other reasons include internal electronic malfunctions, damage caused by overvoltage, or moisture ingress, all of which can lead to complete system failure.

Following a collision—even minor ones—the control unit permanently writes crash data into its internal memory. This lockout is a manufacturer‑imposed safety feature that causes the SRS warning light to remain illuminated and disables the system.

Electronic faults often manifest as “internal errors.” Causes may include overvoltage—such as from a jump start—or moisture damage that destroys circuit traces and sensitive components on the PCB. Such defects frequently prevent any communication with the unit.

Typical error codes indicating such hardware failures are B1000 (no communication) or 65535 (control unit defective). These errors cannot be resolved simply by clearing the fault memory, as the underlying issue lies within the control unit itself.

How do you recognize a faulty airbag control unit 8200748155?

A defect in the 8200748155 control unit is primarily indicated by a permanently lit or flashing SRS warning light on the instrument cluster. Another clear sign is that workshops using their diagnostic equipment can no longer establish communication with the airbag system, effectively blocking troubleshooting efforts.

The most noticeable symptom is the active airbag warning light. It unmistakably informs the driver that the entire restraint system is disabled and that the airbags will not deploy in the event of a crash, posing a significant safety risk.

If the control unit stops responding to diagnostic requests, this strongly suggests an internal hardware failure. Neither reading fault codes nor clearing error messages is possible at that point, as the central control unit is no longer accessible.

In which vehicles is the control unit 8200748155 installed?

The airbag control unit with part number 8200748155 is specifically fitted to the second generation of the Dacia Logan. This includes both pre-facelift models and the revised versions, ensuring broad coverage within this vehicle series.

At Airbag24, we repair the 8200748155 control unit and equivalent variants for the following specific models:

Dacia Logan II (model years 2012–2016)

Dacia Logan II Facelift (model years 2016–2020)

Is repairing the control unit 8200748155 worthwhile?

Yes, repair represents an economically and technically sensible alternative to purchasing a new unit. A brand‑new part typically costs around €450 at a workshop, whereas repair offers substantial savings. Moreover, the refurbished original unit is immediately ready for use and eliminates the need for time‑consuming reprogramming.

The biggest advantage is the significant cost reduction compared to buying a new part directly from the vehicle manufacturer. You regain full functionality without paying the high price of a replacement component.

Since the original control unit is repaired, all vehicle‑specific data remains intact. After installation, the unit is usually ready to operate right away (plug-and-play), avoiding additional workshop expenses for coding or programming.

Professional refurbishment restores the full functionality of the safety system. With a 12‑month warranty on the completed repair, you’re also on the safe side.

How is the control unit 8200748155 professionally repaired?

Professional repair at Airbag24 follows a standardized process that includes systematic electronic diagnostics, elimination of the root cause of the fault—such as clearing crash data or replacing defective components—and a final functional test. This ensures the unit performs like new.

Upon receipt of the control unit at Airbag24, technicians conduct a thorough incoming inspection to pinpoint the exact source of the fault on the circuit board, using specialized measurement and diagnostic equipment.

The core of the repair involves erasing stored crash data at the hardware level or addressing internal defects caused by overvoltage or moisture. Defective electronic components are replaced with new, high-quality parts.

After refurbishment, each control unit undergoes a functional test to verify proper operation. All repairs come with a 12-month warranty. Following reinstallation, it is recommended to perform a final clearance of the vehicle’s fault memory using a diagnostic tool.

What shipping options does Airbag24 offer?

Airbag24 provides flexible, customer-friendly shipping solutions. You can send your defective control unit free of charge or arrange for convenient UPS pickup. For return shipping, you can choose between free standard and faster express options, including cash-on-delivery.

For outbound shipping, you have several choices: ship the package yourself at no cost, drop it off in person, or take advantage of the convenient UPS pickup service from a location of your choice.

For returning the repaired unit, multiple options are available: free UPS standard shipping, faster UPS express shipping, or self-collection. Both standard and express shipping can additionally be combined with cash-on-delivery.