Airbag control unit with part number 9633621280

What does the airbag control unit 9633621280 do?

The control unit 9633621280 controls the restraint system (SRS) of Peugeot as an airbag control unit. It checks the sensor signals, determines in a crash which airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

If it detects a fault, it stores it and shows it via the airbag warning light. After an accident it additionally secures crash data and locks itself.

Why does the control unit 9633621280 fail?

Most often the cause lies in crash data stored after an accident, even if no airbag has deployed. Further causes are ageing components, cold solder joints, moisture or corrosion at plugs, and voltage spikes.

Crash data remains in the memory, and a normal diagnostic tool cannot erase it. This is why the fault does not resolve itself.

The other causes develop gradually. Electronics age, solder joints can give way under load, and moisture attacks plug connections. A weak battery or jump-starting can also stress the control unit.

How can you tell that the 9633621280 is defective?

A defect shows up through the airbag warning light, which lights up permanently or intermittently, through a fault message in the instrument cluster, through a missing connection of the diagnostic tool, and through a fault memory that cannot be cleared.

• Airbag warning light in the instrument cluster lights up permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

With these signs, airbags and seatbelt pretensioners may fail to trigger in an emergency. Therefore pursue the message promptly.

Which vehicles is the 9633621280 fitted in?

The control unit 9633621280 is fitted in these vehicles: Peugeot 306 I (1993-1997) and I Facelift (1997-2002).

The assignment is based on the models stored for this part number:

• Peugeot 306 I (1993-1997)
• Peugeot 306 I Facelift (1997-2002)

Comparing the part number on the label of the unit with this page only confirms that you have the right unit. Read out the fault memory beforehand, because only this log 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 9620732580, 9621996780, 9636995580.

How does the repair of the 9633621280 work?

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

At Airbag24 the unit is checked on the test bench, defective components are repaired, crash data is erased and a function test is carried out. Afterwards your own unit is returned to you.

For checking, repairing and testing at Airbag24, expect 3–4 working days as a rule. This figure refers solely to the work 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 9633621280 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. Airbag24 sends the repaired unit back to you by UPS.

Pack the printed repair order into the parcel and pack the control unit shockproof.