Airbag control unit with part number 9803946780

What does the airbag control unit 9803946780 do?

The airbag control unit 9803946780 is the central control unit of the restraint system (SRS) for Peugeot. It processes the signals from the crash sensors and, in an accident, decides within milliseconds whether airbags and seatbelt pretensioners are triggered.

It also monitors the system continuously and reports faults via the airbag warning light. After an accident it stores crash data and locks itself.

Why does the control unit 9803946780 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Other possible 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, which is precisely why the fault persists.

The other causes are of a more general nature. Components age, solder joints can go cold, and moisture or corrosion affect plug connections. Voltage spikes occur, for example, with a weak battery or when starting with a jump start.

How can you tell that the 9803946780 is defective?

A fault shows up through the airbag warning light, which lights permanently or intermittently, through a fault message in the instrument cluster, through no connection to the diagnostic tool, and through a fault memory that cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then fail to trigger.

The instrument cluster warns with the warning light as soon as the control unit detects a fault. This warning must not be ignored, because the fault affects the protective function directly.

A diagnostic tool that cannot establish a connection is a further sign of a problem in the system.

Which vehicles is the 9803946780 fitted in?

The airbag control unit 9803946780 is fitted in these vehicles: Peugeot 308 II (2013-2017) and II Facelift (2017-2021).

The list below shows which vehicles this unit is assigned to.

• Peugeot 308 II (2013-2017)
• Peugeot 308 II Facelift (2017-2021)

(a) Comparing the part number on the label with this page only confirms that the unit is the correct one. (b) The result of a fault memory read-out shows first 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 624926000, 9807568180.

How does the repair of the 9803946780 work?

Have the fault memory read out first and enclose the log. Then disconnect the battery and only now remove the control unit 9803946780. Create the repair order online and send the packed unit.

Airbag24 tests the unit on the test bench and replaces defective components. Stored crash data is removed by Airbag24 before a function test follows. Processing usually takes 3–4 working days, after which your own unit is returned.

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 9803946780 get to Airbag24?

Shipping is either by a parcel that you send yourself or by a UPS collection for an extra charge. Airbag24 sends the repaired control unit 9803946780 back by UPS.

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