Airbag control unit with part number 629198200

What is the function of Airbag Control Unit 629198200?

The airbag control unit with part number 629198200 is the central control module of the occupant safety system (SRS) in the Nissan Murano Z52. It processes data from acceleration and yaw rate sensors to detect a collision and, if necessary, precisely deploy the airbags and seatbelt pretensioners.

Inside the control unit, a microcontroller continuously processes signals from crash sensors distributed throughout the vehicle as well as internal sensors. When predefined thresholds indicating a collision are exceeded, the unit sends ignition pulses to the corresponding pyrotechnic restraint systems.

To ensure functionality even if the vehicle’s onboard power supply fails during a crash, the control unit includes internal energy storage in the form of capacitors. All vehicle-specific data, configuration settings, and especially crash event records are stored in non-volatile memory modules (EEPROM/Flash).

What types of failures occur in Control Unit 629198200?

The most common cause of failure for Control Unit 629198200 is stored crash data that software‑locks the system after an accident. In addition, internal electronic faults may arise in components such as driver ICs, memory chips, or due to cold solder joints.

Following a crash—even if only the seatbelt pretensioners have deployed—the control unit stores what is known as a “crash data record.” This record prevents further operation of the airbag system and must be reset through professional repair to extinguish the airbag warning light and restore full system functionality.

Other failures result from aging electronic components. This can lead to corrupted EEPROM contents, defective airbag driver ICs, or issues with the board’s power supply. External factors like voltage surges or moisture can also damage the sensitive electronics.

How do you recognize a fault in the Airbag Control Unit?

A fault in Control Unit 629198200 primarily manifests as a permanently illuminated airbag warning light on the instrument cluster. Often, the fault memory cannot be cleared, or the control unit becomes inaccessible to diagnostic tools via the OBD interface.

The most obvious symptom is the persistently lit airbag warning light, signaling to the driver that the occupant protection system is either non‑functional or only partially operational—and may fail to deploy in the event of a crash.

Another clear indication is when a workshop using diagnostic equipment cannot establish communication with the airbag control unit. The fault memory cannot be read or erased, pointing to a serious internal malfunction within the module.

The fault memory often contains specific entries such as “Airbag Control Unit Fault,” “Internal Airbag Error,” or references to stored crash data. These error codes confirm that the root cause lies directly within the control unit.

In which vehicles is Control Unit 629198200 installed?

Part number 629198200 is a specialized airbag control unit developed specifically for the Nissan Murano Z52 series. It is an alternative original equipment manufacturer (OEM) part number used in these models.

At Airbag24, we repair this control unit for the following model. Its application is clearly defined and limited to this vehicle generation:

Nissan Murano Z52 (approximately model years 2015–2024)

How does the repair of Control Unit 629198200 proceed?

Repair at Airbag24 involves a complete electronic overhaul of the original control unit. After removal and shipment, the unit undergoes inspection, crash data is cleared, defective components are replaced, and finally, flawless functionality is simulated and verified on a test bench.

Before removal, precise diagnostics on the vehicle are essential. The workshop should confirm that the fault originates from the control unit itself rather than external components such as sensors, connectors, or the spiral cable. Subsequently, the control unit is carefully removed and securely packaged for shipment to Airbag24.

At Airbag24, the unit first undergoes an initial incoming inspection. Our technicians analyze the circuit board, read the memory, and reset the crash data. If electronic defects are present, affected components—such as driver ICs or voltage regulators—are professionally replaced, and cold solder joints are reworked.

Following repair, a comprehensive final test verifies communication and all ignition circuits under simulated driving conditions. The refurbished control unit can then be reinstalled in the vehicle (plug-and-play). We provide 2 years' statutory liability for defects on every repair.