Airbag control unit with part number 30348797B

What is the function of Airbag Control Unit 30348797B?

The control unit with part number 30348797B is the central control module of the airbag and restraint system (SRS) in the Fiat Croma (Type 194). It continuously analyzes data from acceleration and crash sensors to precisely deploy airbags and seatbelt pretensioners at the right moment in the event of a collision.

As the brain of the passive safety system, this module is responsible for detecting the severity and type of an impact. Based on this information, it determines which pyrotechnic components—such as front airbags, side airbags, or seatbelt pretensioners—need to be activated to provide optimal occupant protection.

Several variants of this control unit exist for the Fiat Croma 194. In addition to 30348797B, related part numbers like 735398743 and 303558718 are also in circulation, indicating different hardware revisions or trim levels. Therefore, carefully verifying the part number installed in your vehicle is essential.

Why does Airbag Control Unit 30348797B fail?

One of the most common causes of failure for control unit 30348797B is the storage of crash data after an accident. Additionally, internal hardware defects—such as faulty SMD components, cold solder joints, corrosion caused by moisture, or damage due to over- or undervoltage—can lead to malfunctions.

After deploying airbags or seatbelt pretensioners, the control unit permanently stores an unerasable crash record. This safety feature locks the device, making repair or replacement unavoidable to restore the functionality of the restraint system.

Electrical faults are another major cause of failure. Defective capacitors, fuses, or circuit traces on the PCB can disrupt power supply or cause internal communication errors. Such hardware issues often result in the control unit becoming inaccessible via diagnostic tools.

How do you recognize a defective 30348797B control unit?

The primary symptom of a defect is a constantly illuminated airbag or SRS warning light on the instrument cluster. Another clear indication is that diagnostic tools cannot establish communication with the airbag control unit, rendering OBD-based fault diagnosis impossible.

The airbag warning light alerts the driver to a malfunction in the restraint system, meaning protective functions may no longer be guaranteed in the event of a crash. The light remains on even after restarting the engine.

In the workshop, the defect often manifests as a loss of connection to the control unit. The tester reports “No Communication” or “Control Unit Not Responding.” Sometimes, specific error codes such as “Internal Control Unit Error,” power supply faults, or CAN bus errors appear before communication completely breaks down.

In which vehicles is Airbag Control Unit 30348797B installed?

The airbag control unit with part number 30348797B is specifically designed for the Fiat Croma. At Airbag24, we repair this module for the entire Type 194 series, including pre- and post-facelift models. Repairs are available for the following vehicle models:

Fiat: Croma 194 (2005–2007) and Croma 194 Facelift (2007–2011)

Since alternative part numbers such as 735398743 and 303558718 were also used in this model range, it’s important to verify the number stamped on the unit. However, our repair services cover all functionally equivalent variants.

How is Airbag Control Unit 30348797B professionally repaired?

At Airbag24, repairs follow a strict, professional procedure. Following an initial inspection involving visual and electronic diagnostics, the root cause of the fault is identified. Depending on the issue, crash data is reset or defective electronic components on the PCB are replaced. A final test ensures full functionality.

The process begins with a thorough analysis. Technicians examine the unit for external damage, such as corrosion or broken connectors, and read out the internal fault memory to pinpoint the exact source of the problem—whether it’s stored crash data or a hardware defect.

If only a crash record exists while the hardware remains intact, the data is professionally erased. For electrical faults, repairs are performed at the component level, including replacing defective SMD parts, repairing circuit traces, or renewing capacitors and fuses using micro-soldering techniques.

After repair, the control unit is simulated in a test environment to confirm proper communication and operation. Each repair is documented with a detailed test report and comes with a 12-month warranty.

What shipping options does Airbag24 offer?

You can either send your defective control unit to us yourself or arrange a convenient UPS pickup at your preferred location. For the return shipment after repair, Airbag24 provides free standard UPS shipping. Optionally, for an additional fee, you can choose express shipping or cash-on-delivery.

For the outbound shipment, you have two options: ship the package directly to our address or use the UPS pickup service, which you can request when placing your order.

For the return shipment, several options are available: free standard UPS shipping, faster UPS express shipping, and both options with the option of cash-on-delivery. Alternatively, you can also pick up the repaired unit in person at our premises.