Airbag control unit with part number 9851634380

What does the airbag control unit 9851634380 do?

For Peugeot, the airbag control unit 9851634380 controls the restraint system (SRS). It reads the crash sensors, determines in an accident the triggering of airbags and seatbelt pretensioners, and checks the system constantly. Faults appear on the airbag warning light.

Sensors and control unit work together. Triggering depends on this unit processing the sensor values correctly.

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

Why does the control unit 9851634380 fail?

The most common cause is crash data stored after an accident, even if no airbag has triggered. Other causes are aged components, cold solder joints, moisture and corrosion, and voltage spikes.

Standard diagnostic tools cannot delete the crash data. The crash data therefore remains in the memory until it has been checked and dealt with.

The other causes act over time: components age, solder joints can be cold, and moisture attacks the plug connections. Voltage spikes, for example from a weak battery, can disturb the electronics. Which cause applies in an individual case is shown by the inspection.

How can you tell that the 9851634380 is defective?

A defect in the 9851634380 shows up as the airbag warning light in the instrument cluster lighting up permanently or intermittently. In addition, an error message appears in the instrument cluster, the diagnostic tool cannot establish a connection with the control unit, or the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then possibly not deploy. You should therefore take such a display seriously and have it checked promptly.

The warning light makes the finding visible and therefore deserves prompt attention, regardless of whether it lights up permanently or intermittently.

Which vehicles is the 9851634380 fitted in?

The control unit 9851634380 is fitted in vehicles from Peugeot: Peugeot 308 III (2021-2025) and III Facelift (from 2025); Peugeot 308 SW III (2021-2025) and III Facelift (from 2025).

The vehicles at a glance:

• Peugeot 308 III (2021-2025)
• Peugeot 308 III Facelift (from 2025)
• Peugeot 308 SW III (2021-2025)
• Peugeot 308 SW III Facelift (from 2025)

Comparing the part number on the label of the removed unit with this page only ensures that it is the correct unit. Whether the control unit itself is defective or a plug or cable is the cause is shown by the fault memory. Therefore have it read out beforehand.

For the same vehicles, we also repair control units with the part numbers 9857895980, 9872679980.

How does the repair of the 9851634380 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Online, create a repair order and send the unit in, well packed.

Airbag24 tests the unit on the test bench, replaces defective components and carries out a functional test. Your own unit is then returned to you. Processing at Airbag24 usually takes 3–4 working days and comprises exclusively testing, repairing and checking.

Repairing a defect remains normally possible with this control unit. 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 9851634380 get to Airbag24?

You send the control unit 9851634380 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it to you by UPS.

Put the printed repair order into the parcel, and pack the unit shockproof.