Airbag control unit with part number 9635784280

What does the airbag control unit 9635784280 do?

The airbag control unit 9635784280 controls the restraint system (SRS) for vehicles of the Peugeot brand. It evaluates the signals from the crash sensors and decides in a crash, within milliseconds, which airbags and seatbelt pretensioners are triggered.

The manufacturer number Continental 5WK42908 is additionally stamped on the housing. The unit monitors the system continuously and displays faults via the airbag warning light. After a crash, it stores crash data and is locked afterwards.

Why does the control unit 9635784280 fail?

Stored crash data from an accident is the most common cause of a fault on control unit 9635784280, even if no airbag has deployed. Standard diagnostic tools cannot erase it. Other causes are aged components, cold solder joints, moisture and corrosion on plugs, and voltage spikes.

The crash data is the reason a fault continues to be displayed despite unremarkable electronics. The unit stores the data regardless of whether an airbag was actually triggered.

The other causes concern the electronics in general. Components age, solder joints can go cold, and moisture or corrosion affect plug connections. Voltage spikes, for example from a weak battery or when starting with a jump start, put additional strain on the unit.

How can you tell that the 9635784280 is defective?

A defect in the 9635784280 is recognised by the airbag warning light in the instrument cluster, which lights up permanently or intermittently. In addition, there is an error message, a missing connection to the diagnostic tool and a fault memory that cannot be cleared.

As long as the defect persists, airbags and seatbelt pretensioners may possibly fail to deploy in an emergency. The warning light is therefore a sign that requires a prompt check.

Which vehicles is the 9635784280 fitted in?

The control unit 9635784280 is fitted in these vehicles: Peugeot 307 I (2001-2005) and I Facelift (2005-2009); Peugeot 307 SW I (2001-2005) and I Facelift (2005-2009).

The following vehicles are recorded for this part number:

• Peugeot 307 I (2001-2005)
• Peugeot 307 I Facelift (2005-2009)
• Peugeot 307 SW I (2001-2005)
• Peugeot 307 SW I Facelift (2005-2009)

Comparing the part number on the label of the removed unit with this page merely confirms that you have the right unit. Have the fault memory read out beforehand, because only this result shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 6545HE, 6545HF, 6545HJ, 9650109280, 9650109480, 9652712180.

How does the repair of the 9635784280 work?

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

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. The unit then goes back to the sender. The time stated relates only to checking, repairing and testing at Airbag24. 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 9635784280 get to Airbag24?

You send the control unit 9635784280 as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

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