Airbag control unit with part number P31387019

What does the airbag control unit P31387019 do?

The airbag control unit P31387019 is the central component of the restraint system (SRS) of Volvo. It checks the signals from the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

The housing also carries the manufacturer number Bosch 0285011728. The control unit works in the background and reports faults via the airbag warning light in the instrument cluster.

In an emergency every millisecond counts, which is why the unit monitors its surroundings without pause.

Why does the control unit P31387019 fail?

Stored crash data is the most common cause of a fault in the P31387019, even if no airbag has deployed. Aged components, cold solder joints, and moisture or corrosion at plug connections are also possible, as are voltage spikes.

A normal diagnostic tool cannot delete the crash data. It therefore stays in the unit until a repair removes it.

The other causes concern ageing and environmental influences: components lose reliability over time, solder joints may have gone cold, and moisture and corrosion attack the plug connections. Voltage spikes, for example from a weak battery or a jump start, put additional strain on the electronics.

How can you tell that the P31387019 is defective?

A defect in the P31387019 shows up as an airbag warning light that lights up permanently or intermittently, as a fault message in the instrument cluster, or as a missing connection to the diagnostic tool. Then airbags and seatbelt pretensioners may not deploy in an emergency.

These signs indicate a defect:

• Airbag warning light in the instrument cluster lights up permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

Have each of these signs checked promptly.

Which vehicles is the P31387019 fitted in?

The list shows the vehicles with this part number. The P31387019 is fitted in these vehicles: Volvo V70 B Facelift (2013-2016) and B (2007-2013).

Here are the individual vehicles:

• Volvo V70 B Facelift (2013-2016)
• Volvo V70 B (2007-2013)

Compare the part number on the label of the removed unit with this page. This comparison only confirms the right unit. Read out the fault memory beforehand: only that 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 31387019, P31264932, P31406630.

How does the repair of the P31387019 work?

For the P31387019, first read out the fault memory and enclose the log. Then disconnect the battery, and only after that remove the control unit. Finally create the repair order online and pack the unit well before sending it. For checking, repair and test at Airbag24, allow 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components and deletes the crash data. A functional test follows. Afterwards your own, repaired unit returns 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 P31387019 get to Airbag24?

You send the P31387019 to Airbag24 as a parcel, or you book a UPS collection for an extra charge. The return after the repair is made by UPS.

Put the printed repair order into the parcel and pack the unit shock-resistant. This way it arrives safely.