Airbag control unit with part number 31295112

What does the airbag control unit 31295112 do?

In the Volvo, the airbag control unit 31295112 processes the messages from the crash sensors and, in the event of an impact, triggers the appropriate airbags and seatbelt pretensioners.

It also monitors the system so that faults are noticed. The airbag warning light in the instrument cluster then shows the fault.

After an accident, the unit stores crash data and locks itself. The manufacturer number Bosch 0285010729 is also printed on the housing.

Why does the control unit 31295112 fail?

The most common cause with the control unit 31295112 is crash data stored after an accident, even if no airbag has deployed. Other causes include aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from a weak battery or jump-starting.

The crash data remains stored after the accident. A normal diagnostic tool cannot erase it, but Airbag24 erases it during the repair.

The other causes concern the electronics over their entire service life. Components age, solder joints can become cold, and moisture or corrosion affect the contact at the connectors. Voltage spikes also act on the circuitry.

How can you tell that the 31295112 is defective?

On the 31295112, a fault usually shows first through the airbag warning light in the instrument cluster, which stays on permanently or intermittently. Further signs are fault messages in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared.

The warning light in particular makes the finding visible, and it should not be dismissed as a minor matter.

In that case there is a risk that the airbags and seatbelt pretensioners will not deploy in an emergency. A look at the fault memory will provide clarity.

Which vehicles is the 31295112 fitted in?

The 31295112 is fitted in these vehicles: Volvo XC90 C Facelift (2006-2014).

The overview here shows which vehicles belong to it:

• Volvo XC90 C Facelift (2006-2014)

First: compare the part number on the label of the removed unit with this page. This only confirms whether it is the correct unit. Second: have the fault memory read out beforehand, because it shows whether the control unit is defective or whether a plug or cable is responsible.

For the same vehicles, we also repair control units with the part numbers 30782386, 32315584, P30658913, P30724152.

How does the repair of the 31295112 work?

First, have the fault memory read out and attach the log. Then disconnect the battery, remove the control unit 31295112 and create a repair order online.

Then pack the unit well and send it in. Airbag24 examines it on the test bench, replaces defective components, erases the crash data and tests the function.

Processing at Airbag24 usually takes 3–4 working days. Your own unit is then returned to you.

This order is fixed for safety reasons. 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 31295112 get to Airbag24?

You send the control unit 31295112 yourself as a parcel or book UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

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