Airbag control unit with part number 9803916780

What does the airbag control unit 9803916780 do?

The airbag control unit 9803916780 is the central control unit of the restraint system of Citroën and Peugeot. It evaluates the signals from the crash sensors, decides within milliseconds in the event of an accident on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. After an accident it stores crash data and locks itself.

The control unit reports faults in the system via the airbag warning light in the instrument cluster. This is how you find out in everyday use when something is wrong.

The crash data record how an accident event proceeded and remain in the control unit.

Why does the control unit 9803916780 fail?

The most common cause is crash data stored after an accident, which cannot be erased with a normal diagnostic tool. Further causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, as well as voltage spikes, for example from a weak battery or jump-starting.

Crash data is stored as soon as the control unit registers an accident event, even if no airbag has triggered. A normal diagnostic tool cannot remove these entries, so the fault remains even after the accident.

The other causes act mainly over time. Ageing and cold solder joints lead to loose contacts, moisture and corrosion attack plug connections, and voltage spikes in the vehicle electrical system can stress the electronics.

How can you tell that the 9803916780 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 cannot find the control unit, and a fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The airbag warning light in the instrument cluster lights up permanently or intermittently as soon as the control unit detects a fault. It is the most important indication of a defect, and a permanent light should not be ignored.

If the diagnostic tool cannot connect to the control unit, or the fault memory refills after being cleared, there is also a problem. A readout shows what is causing it.

Which vehicles is the 9803916780 fitted in?

The airbag control unit 9803916780 is fitted in these vehicles: Citroën Berlingo II B9 (2008-2012), II 2nd Facelift (2015-2018) and II 1st Facelift (2012-2015); Peugeot Partner II 1st Facelift (2012-2015), II (2008-2012) and II 2nd Facelift (2015-2019); Citroën Berlingo Multispace II 1st Facelift (2012-2015), II 2nd Facelift (2015-2018) and II B9 (2008-2012). The part number only tells you which unit it is, not whether it is defective.

The following list shows the vehicles recorded for this part number. Check your vehicle against it.

• Citroën Berlingo II B9 (2008-2012)
• Citroën Berlingo II 2nd Facelift (2015-2018)
• Citroën Berlingo II 1st Facelift (2012-2015)
• Peugeot Partner II 1st Facelift (2012-2015)
• Peugeot Partner II (2008-2012)
• Peugeot Partner II 2nd Facelift (2015-2019)
• Citroën Berlingo Multispace II 1st Facelift (2012-2015)
• Citroën Berlingo Multispace II 2nd Facelift (2015-2018)
• Citroën Berlingo Multispace II B9 (2008-2012)

Compare the part number on the label of the removed unit with this page. This makes sure it is the correct unit. Have the fault memory read out beforehand, because only the result 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 6590PK, 9665250280, 9665558380, 9665558480, 9665944180, 9673393980.

How does the repair of the 9803916780 work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit. Then create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

The order is fixed for safety reasons: first the fault memory, then the battery, and only then the removal. Afterwards create the repair order and pack the unit well.

Airbag24 checks the unit on the test bench, repairs defective components 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 9803916780 get to Airbag24?

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

Place the printed repair order in the parcel and pack the control unit shockproof.