Airbag control unit with part number 90450273

What is the function of Airbag Control Unit 90450273?

The airbag control unit with part number 90450273 is the central control module for the occupant protection system, specifically designed for the Opel Astra F (model years 1991–2000). It is also known under the designations 5WK4072 or 00018496 and processes data from crash sensors to precisely deploy airbags and seatbelt pretensioners in the event of a collision.

As the brain of the passive safety system, this airbag control unit continuously monitors all connected components, including front and side airbags, seatbelt pretensioners, as well as their associated acceleration and pressure sensors. Its primary task is to reliably detect an accident situation and activate the restraint systems within milliseconds to provide optimal protection for occupants.

Why does control unit 90450273 fail?

Failures of control unit 90450273 are often caused by stored crash data after an accident, even if the airbags did not deploy. Other causes include age-related defects in electronic components such as capacitors or sensors, as well as general electrical malfunctions that lead to internal hardware failures within the device.

One of the most common reasons is the storage of crash data in the unit’s internal memory. Even minor rear-end damage resulting only in activation of the seatbelt pretensioners can cause the control unit to lock up, leaving the airbag warning light permanently illuminated. In such cases, simple clearing via a diagnostic tool is no longer possible.

Furthermore, aging electronic components can lead to malfunctions. Defective capacitors or internal sensors may result in intermittent or persistent error messages. In some instances, complete failure occurs, often manifesting as thermal issues—such as malfunction when the unit heats up.

How do you recognize a defect in 90450273?

A defect in control unit 90450273 typically manifests as a permanently or intermittently illuminated airbag warning light on the instrument cluster. Communication with a diagnostic tool may also be lost, or accompanying symptoms like a non-functioning clock or complete failure under heat conditions may appear.

The most obvious symptom is the persistently lit airbag warning light, signaling a fault in the restraint system and clearly indicating that the control unit has detected a malfunction or is itself defective.

Another critical sign is total loss of communication. If the workshop can no longer access the airbag control unit using a diagnostic device, this often points to a severe internal hardware failure.

In addition, specific error codes such as “internal airbag error” or “side sensor error” may appear during vehicle startup. Unusual electrical problems, such as a malfunctioning clock on the instrument panel, can also directly correlate with a defect in the airbag control unit.

In which vehicles is 90450273 installed?

The airbag control unit with part number 90450273 was developed specifically for one vehicle generation. At Airbag24, we repair this control unit for the Opel Astra F produced between 1991 and 2000, including specific variants such as the Hatchback 1.7 TDS (T92).

Airbag24’s repair expertise is tailored specifically to this model. The following vehicle is equipped with part number 90450273:

Opel: Astra F (model years 1991–2000), including body styles such as the Hatchback (T92) with engine options 1.7 TDS (F08, M08, F68, M68).

Since this is a component unique to this vehicle series, verifying the part number before removal is crucial for a successful repair.

How does repair at Airbag24 work?

After sending the removed control unit 90450273 to Airbag24, technicians perform a thorough analysis. Repairs typically involve replacing faulty electronic components and professionally erasing stored crash data. The unit is then tested and ready for immediate use as a plug-and-play solution.

The process ideally begins with a diagnosis at a specialized workshop to confirm that the root cause of the issue truly lies in the control unit. Following proper removal, please ship the unit securely packaged to Airbag24.

Our technicians conduct an incoming inspection to verify the reported fault. Subsequently, necessary repair measures are undertaken, including erasing crash data from memory and replacing defective hardware components on the circuit board. After successful repair and final functional testing, the control unit is fully operational without further programming or coding. We offer 2 years' statutory liability for defects on every repair.