Airbag control unit with part number P31201474

What does the airbag control unit P31201474 do?

The airbag control unit P31201474 is the central control unit of the restraint system (SRS) in Volvo vehicles. It evaluates the signals from the crash sensors, decides in an accident within fractions of a second whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

The control unit reports faults via the airbag warning light in the instrument cluster. Monitoring runs in the background.

Reliable evaluation matters above all in an emergency, because there is no time for checks then.

Why does the control unit P31201474 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. A normal diagnostic tool cannot erase it. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Stored crash data remains in the control unit, regardless of whether an airbag has been triggered. A fault therefore does not necessarily have a visible link to the accident.

The other causes lie in the electronics and the plug connections. Moisture and corrosion attack the contacts, and voltage spikes, for example from a weak battery or a jump start, stress the components.

How can you tell that the P31201474 is defective?

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

The signs at a glance:

• Airbag warning light stays on permanently
• Airbag warning light comes on intermittently
• Error message in the instrument cluster
• No connection to the control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may fail to trigger.

Which vehicles is the P31201474 fitted in?

The airbag control unit P31201474 is fitted in these vehicles: Volvo S80 AS (2006-2016).

The vehicles for this part number can be found here:

• Volvo S80 AS (2006-2016)

Compare the part number on the label of the removed unit with this page. This only ensures that you have removed the correct unit. Also have the fault memory read out beforehand, because only this result 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 P31201474 work?

First have the fault memory read out and attach the log. Then disconnect the battery, and only then remove the control unit P31201474. Next, create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit, replaces defective components, erases the stored crash data and carries out a functional test.

Your own unit then 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 P31201474 get to Airbag24?

You send the control unit P31201474 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

The printed repair order goes into the parcel. Pack the unit securely against impact.