Airbag control unit with part number P30773354

What does the airbag control unit P30773354 do?

The airbag control unit P30773354 controls the restraint system (SRS) for Volvo. It measures with the crash sensors how strong an impact is and selects from this, within milliseconds, the airbags and seatbelt pretensioners that should trigger.

It also monitors the entire system during operation and shows faults via the airbag warning light. The light in the instrument cluster is thus the control unit's feedback to the driver.

After an accident it stores crash data and locks itself.

Why does the control unit P30773354 fail?

The most common cause is crash data from an accident, which is stored even when no airbag triggers. Also present are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from weak batteries or jump-starting.

Crash data cannot be erased with an ordinary diagnostic tool. Airbag24 removes it during the repair, so the unit comes back without it.

The other causes are technical in nature: electronic components can age, solder joints can be cold, moisture and corrosion disturb the contacts, and voltage spikes load the circuit.

How can you tell that the P30773354 is defective?

In case of a defect the airbag warning light in the instrument cluster stays on or lights up only at times. An error message in the instrument cluster, a diagnostic tool without connection to the control unit, and a fault memory that cannot be cleared are also possible. In such cases the airbags and seatbelt pretensioners may not trigger in an emergency.

A silent diagnostic tool does not say anything definite about the control unit, though; plugs or cables can have the same effect.

Only the readout of the fault memory clarifies which cause is present.

Which vehicles is the P30773354 fitted in?

The following vehicles are on record for the control unit P30773354: Volvo S40 M (2004-2007) and M Facelift (2007-2012). The basis for this is the part number.

The overview lists the models that belong to this part number.

• Volvo S40 M (2004-2007)
• Volvo S40 M Facelift (2007-2012)

Compare the part number on the label with this page. That way you know you have the right unit in front of you. Whether the control unit is defective or whether a plug or cable is the cause is shown only by the fault memory, which you have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 30773401, 31334738, P30724427, P30724652, P30773401, P31295109.

How does the repair of the P30773354 work?

Have the fault memory read out, attach the log, then disconnect the battery and afterwards remove the control unit P30773354. Online you create the repair order, and you send in the well-packed unit. Then Airbag24 takes over: the unit is inspected, defective components are repaired, crash data is erased and a function test follows.

The sequence is mandatory for safety reasons.

Processing at Airbag24 usually takes 3–4 working days.

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. Our repairs come with 2 years' statutory liability for defects.

How does the control unit P30773354 get to Airbag24?

Either you send the unit as a parcel, or you book a UPS collection for an extra charge. Return shipping after the repair is handled by Airbag24 by UPS.

Enclose the printed repair order and make sure the packaging is shock-proof.