Airbag control unit with part number P31313827

What does the airbag control unit P31313827 do?

The airbag control unit P31313827 acts as the central unit for the SRS restraint system of Volvo. In an accident it processes the sensor signals and selects, within milliseconds, which airbags and seatbelt pretensioners are triggered.

It monitors the system continuously and shows faults via the airbag warning light. That way you notice malfunctions without having to take the vehicle apart.

After an accident, the unit locks itself and at the same time retains the crash data.

Why does the control unit P31313827 fail?

At the control unit P31313827, the most common cause after an accident is stored crash data, even if no airbag has been triggered. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Stored crash data cannot be removed with a normal diagnostic tool. This memory is the reason why a diagnostic tool alone does not help.

Electronic components age over time, and solder joints can go cold, which leads to recurring faults.

Moisture and corrosion at the plugs disrupt the contact. Voltage spikes, for example from a weak battery or a jump start, can likewise cause damage.

How can you tell that the P31313827 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently as soon as a defect is present at the P31313827. An error message in the instrument cluster, a missing connection between the diagnostic tool and the control unit, or a fault memory that cannot be cleared also appear.

The defect is therefore displayed in the vehicle, and the warning light must be taken seriously.

As long as the fault persists, airbags and seatbelt pretensioners may not be able to deploy in an emergency.

Which vehicles is the P31313827 fitted in?

The unit P31313827 is fitted in these vehicles: Volvo XC60 Y20 (2008–2013) and Y20 Facelift (2013-2017).

These vehicles are recorded with us:

• Volvo XC60 Y20 (2008–2013)
• Volvo XC60 Y20 Facelift (2013-2017)

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

For the same vehicles, we also repair control units with the part numbers 31318792, 31658440, P 31406637, P31334279.

How does the repair of the P31313827 work?

You first have the fault memory read out and enclose the log, then disconnect the battery. Only then do you remove the control unit P31313827.

Then create the repair order online and send the unit off well packed.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. For testing, repairing and checking at Airbag24, expect 3–4 working days as a rule, after which your 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 P31313827 get to Airbag24?

You send the control unit P31313827 to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, the return is made by UPS.

Pack the control unit shock-proof and enclose the printed repair order.