Airbag control unit with part number P31658130

What does the airbag control unit P31658130 do?

The airbag control unit P31658130 is the central control unit of the restraint system in Volvo vehicles. It evaluates the sensors, decides on triggering in an accident, and monitors the system continuously.

Detected faults are shown via the airbag warning light in the instrument cluster.

After an accident the unit stores crash data and locks itself.

Why does the control unit P31658130 fail?

The most common reason for failures of the P31658130 is stored crash data, even when no airbag has fired. Diagnostic tools with usual functions do not delete it. Other possible causes include aged components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Crash data remains stored until it is specifically removed.

The other causes concern electronics and contacts. Moisture and salt act on plug connections, and voltage spikes, for example from a weak battery or jump-starting, additionally stress the electronics.

How can you tell that the P31658130 is defective?

A defect in the P31658130 shows itself through several signs. In an emergency, airbags and seatbelt pretensioners may therefore fail to deploy.

Pay particular attention to these signs:

• The airbag warning light in the instrument cluster stays on permanently or intermittently.
• An error message appears in the instrument cluster.
• The diagnostic tool gets no connection to the control unit.
• The fault memory cannot be cleared.

Each of these signs justifies an inspection, even if the light only comes on intermittently.

Which vehicles is the P31658130 fitted in?

The control unit P31658130 is fitted in these vehicles: Volvo XC90 2nd generation (2015-2019) and 2nd generation Facelift (2019-2024). The details refer to Volvo.

The vehicles in the assignment:

• Volvo XC90 2nd generation (2015-2019)
• Volvo XC90 2nd generation Facelift (2019-2024)

First compare the part number on the removed unit with this page; this only confirms the assignment. Before that, have the fault memory read out, because only this log shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 285001447, 285010210, 32315584, P 31681525, P30658913, P30737501.

How does the repair of the P31658130 work?

Have the fault memory of the P31658130 read out before removal and attach the log. Then disconnect the battery and only afterwards remove the control unit. Processing at Airbag24 usually takes 3–4 working days.

Then create a repair order online and send the unit in, well packed. Airbag24 checks it on the test bench, renews defective components, deletes the stored crash data and carries out a function test.

The 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 P31658130 get to Airbag24?

You send the control unit P31658130 in as a parcel, or book a UPS collection for an extra charge. After the repair Airbag24 returns it by UPS.

The printed repair order goes into the parcel, and the unit must be packed shock-proof.