Airbag control unit with part number P31210474

What does the airbag control unit P31210474 do?

The airbag control unit P31210474 controls the restraint system (SRS) in Volvo by evaluating the crash sensors and, in the event of an accident, deciding whether the airbags and seatbelt pretensioners are triggered.

The system checks the unit without interruption. If it detects a fault, it shows this via the airbag warning light in the instrument cluster.

After an accident it records crash data and locks itself. Only a repair lifts the lock.

Why does the control unit P31210474 fail?

The most common cause: crash data from an accident, even without a deployed airbag. In addition there are ageing electronic components, cold solder joints, moisture and corrosion at the plug connectors, and voltage spikes.

Such data cannot be erased with an ordinary diagnostic tool. Airbag24 takes care of the erasure as part of the repair.

Over time the electronic components age, and cold solder joints can cause contact problems.

Moisture and corrosion at plug connectors impair signal transmission. Voltage spikes, for example from a weak battery or a jump start, also put strain on the electronics.

How can you tell that the P31210474 is defective?

A fault shows up as the airbag warning light in the instrument cluster, which lights up permanently or intermittently, and as an error message in the instrument cluster. A diagnostic tool cannot establish a connection to the control unit, and the fault memory cannot be cleared.

• The airbag warning light stays on permanently or only intermittently.
• An error message appears in the instrument cluster.
• The diagnostic tool does not find the control unit.
• The fault memory remains even after an attempt to clear it.

As long as such signs are present, airbags and seatbelt pretensioners may not deploy in an emergency. Please have the system examined promptly.

Which vehicles is the P31210474 fitted in?

These vehicles are equipped with the P31210474: Volvo S80 AS (2006-2016).

The vehicles are listed individually here:

• Volvo S80 AS (2006-2016)

If the part number on the label matches this page, you have the correct unit in front of you. This comparison proves nothing more.

Have the fault memory read out before you remove anything. Only this result decides whether the control unit is defective or whether a wire or a plug is causing the fault.

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

How does the repair of the P31210474 work?

Before removal, read out the fault memory, enclose the log and disconnect the battery. Processing at Airbag24 usually takes 3–4 working days.

Then remove the control unit, create a repair order online and send it in. You pack the unit carefully before sending it.

At Airbag24 the unit is examined on the test bench, and defective components are replaced. Crash data is erased, a functional test follows, and then your own unit is returned.

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 P31210474 get to Airbag24?

You either send the control unit P31210474 as a parcel or book a UPS collection for an extra charge. The return after the repair is likewise made by UPS.

The parcel contains the printed repair order, and the unit is packed shockproof.