Airbag control unit with part number 9640722980

What does the airbag control unit 9640722980 do?

The airbag control unit 9640722980 is the central unit of the restraint system in Peugeot vehicles. It evaluates the signals from the crash sensors, decides in an accident which airbags and seatbelt pretensioners fire, and monitors the system continuously. It indicates faults via the airbag warning light.

Besides the part number, the housing also carries the manufacturer number Continental 5WK42908.

After an accident, the unit records crash data and locks itself.

Why does the control unit 9640722980 fail?

The most common cause is stored crash data, even when no airbag has deployed. A normal diagnostic tool cannot erase it. Other possible causes include ageing components, dry solder joints, moisture and corrosion on plug connectors, and voltage spikes.

That something remains in the control unit after an accident, without any airbag having deployed, is something many people are unaware of.

The other causes develop over time or through electrical stress. Ageing and dry solder joints count among the gradual causes, whereas voltage spikes are among the sudden ones.

Moisture and corrosion mainly attack the plug connectors through which the unit is connected to the vehicle's electronics.

How can you tell that the 9640722980 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition, a fault message appears in the instrument cluster, the diagnostic tool has no connection to the control unit, and the fault memory cannot be cleared. In that case, airbags and seatbelt pretensioners may not deploy in an emergency.

The light is the signal by which the system itself reports a defect. Do not read it as a false alarm.

Do not rely on the light going out by itself; have the fault memory read out instead.

Which vehicles is the 9640722980 fitted in?

The part number 9640722980 belongs to the following vehicles: Peugeot 307 I (2001-2005) and I Facelift (2005-2009); Peugeot 307 SW I (2001-2005) and I Facelift (2005-2009).

The assignment is listed here:

• 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 with this page, which you carry out on the removed unit, only confirms that it is the right unit. The cause is established only by the fault memory, which you have read out beforehand, because only it shows whether the control unit is defective or whether a plug or cable is affected.

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 9640722980 work?

First have the fault memory read out and attach the log, then disconnect the battery and remove the control unit 9640722980. Then create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data and carries out a function test before the unit is returned.

The order of steps applies for safety reasons. Keep to it without fail, even if the removal seems simple 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 9640722980 get to Airbag24?

Either you send the control unit 9640722980 as a parcel, or you book a UPS collection for an extra charge. The return after the repair is made by UPS.

Include the printed repair order and pack the unit shock-resistant.