Airbag control unit with part number P30773925

What does the airbag control unit P30773925 do?

The airbag control unit P30773925 is the central control unit of the restraint system (SRS) of Volvo. It evaluates the crash sensors, decides in the event of an accident within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. After an accident it stores crash data and locks itself.

The unit reports faults via the airbag warning light in the instrument cluster. This tells you that the restraint system may be limited.

The lock after an accident remains until the repair lifts it.

Why does the control unit P30773925 fail?

Stored crash data is the most common cause after an accident, even if no airbag was deployed; a normal diagnostic tool cannot erase it. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data remains in memory after the event, even if the vehicle drives normally again. Airbag24 erases it during the repair.

Aged electronic components lose performance over the years, cold solder joints lose their contact, and moisture attacks the plug contacts. Voltage spikes, for example from a weak battery or a jump start, put additional strain on the circuits.

How can you tell that the P30773925 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool receives no connection, and the fault memory cannot be cleared.

The airbag warning light in the instrument cluster indicates the defect. As long as the signs persist, airbags and seatbelt pretensioners may not deploy in an emergency, so have the system checked promptly.

Which vehicles is the P30773925 fitted in?

The control unit P30773925 is fitted in these vehicles: Volvo S80 AS (2006-2016).

The assignment lists these vehicles individually:

• Volvo S80 AS (2006-2016)

Compare the part number on the label of the removed unit with this page. This only ensures that it is the correct unit. Have the fault memory read out beforehand, because only this log shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 285001456, 9472627, P30658912.

How does the repair of the P30773925 work?

You read out the fault memory first, then disconnect the battery and only then remove the control unit. Afterwards you create a repair order online and send in the well-packed unit.

Airbag24 checks the control unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. The unit then goes back to you.

For checking, repair and testing at Airbag24, allow 3–4 working days as a rule. This time applies only to this work.

Our repairs come with 2 years' statutory liability for defects. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit P30773925 get to Airbag24?

There are two ways to send it in: a parcel that you send yourself, or a UPS collection booked for an extra charge. UPS handles the return.

The printed repair order must be inside the parcel, and the control unit should be protected against shocks.