Airbag control unit with part number P31288291

What does the airbag control unit P31288291 do?

The airbag control unit P31288291 coordinates the restraint system (SRS) of Volvo in the vehicle. It checks the messages from the crash sensors, decides within milliseconds in an impact about airbags and seatbelt pretensioners, and monitors the system continuously. It shows faults via the airbag warning light.

After an accident, the control unit stores crash data and locks itself. Only the repair lifts the lock.

The monitoring runs in the background during every journey, without you having to notice it.

Why does the control unit P31288291 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. Aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from a weak battery or a jump start can also lead to failure.

Crash data cannot be erased with a standard diagnostic tool. Airbag24 removes it during the repair.

The other causes act over a longer period. Electronic components age, solder joints can go cold, and moisture attacks contacts. A weak battery or a jump start can also produce voltage spikes that affect the control unit.

How can you tell that the P31288291 is defective?

The airbag warning light in the instrument cluster lights up permanently or flashes only now and then. In addition, an error message appears, the diagnostic tool has no connection to the control unit, and the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then not deploy in an emergency.

These signs can occur individually or together:

• Airbag warning light lights up permanently
• Airbag warning light lights up intermittently
• Error message in the instrument cluster
• No connection to the diagnostic tool
• Fault memory cannot be cleared

If you notice any one of these signs, have the fault checked promptly.

Which vehicles is the P31288291 fitted in?

The airbag control unit P31288291 is fitted in these vehicles: Volvo S80 AS (2006-2016).

You will find the vehicle list here:

• Volvo S80 AS (2006-2016)

Compare the part number on the label of the removed unit with this page; that way you can be sure you have the right unit. Have the fault memory read out beforehand: only this log shows whether the control unit is defective or whether a connector 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 P31288291 work?

For the repair of the P31288291, first have the fault memory read out and enclose the log, then disconnect the battery. Only then remove the control unit. Next, create a repair order online and send the well-packed unit in. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases the crash data and carries out a functional test. Afterwards the unit goes back to you.

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 P31288291 get to Airbag24?

You send the control unit P31288291 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the unit shockproof.