Airbag control unit with part number P30773720

What does the airbag control unit P30773720 do?

The airbag control unit P30773720 is the central control unit of the restraint system (SRS) for Volvo. It assesses crash signals within milliseconds and determines which airbags and seatbelt pretensioners are triggered.

Between events it keeps working in the background. It checks the system continuously and shows detected faults via the airbag warning light.

After an accident, the unit stores crash data and locks itself. Only the repair lifts the lock; for you, this means the unit must be repaired.

Why does the control unit P30773720 fail?

Stored crash data is the most common cause for the P30773720, even if no airbag has deployed. Further causes include ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be erased with a normal diagnostic tool. This also applies if no visible damage is left on the vehicle.

The other causes may lie in the electronics. Components age, solder joints can be cold, and moisture attacks plug connections. A weak battery or a jump start also introduces voltage spikes into the system.

How can you tell that the P30773720 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. The diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared.

As long as these signs are present, airbags and seatbelt pretensioners may not trigger in an emergency.

The system therefore reports the defect actively. Anyone who watches the warning light will notice it without detours.

Which vehicles is the P30773720 fitted in?

The P30773720 is fitted in these vehicles: Volvo S80 AS (2006-2016).

Here follows the list of vehicles that Airbag24 links to this part number.

• Volvo S80 AS (2006-2016)

Compare the part number on the label of the removed unit with this page. This only shows that it is the right unit. You should have the fault memory read out in advance, because only the log shows whether the control unit itself or a plug or a cable is the cause.

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

How does the repair of the P30773720 work?

First have the fault memory read out and enclose the log. Then disconnect the battery; only then remove the control unit. Next, create the repair order online. Processing at Airbag24 takes 3–4 working days.

The sequence serves safety and is therefore binding. Only after removal do you pack the unit and send it in.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards, your own unit is returned 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 P30773720 get to Airbag24?

You send the P30773720 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Pack the printed repair order into the parcel. Pack the unit shockproof.