Airbag control unit with part number 550864500

What does the airbag control unit 550864500 do?

As the switching point of the restraint system (SRS) in Peugeot, the airbag control unit 550864500 evaluates the crash sensors. In an accident it decides within milliseconds which airbags and seatbelt pretensioners are triggered. At the same time it monitors the system and displays faults via the airbag warning light.

The unit runs continuously during this time. If a fault is found, it creates an entry in the fault memory, which a diagnosis can read out later.

After an accident it records crash data and locks itself. Every workshop expects this state when reading out.

Why does the control unit 550864500 fail?

The most common cause is crash data from an accident that remains in the unit, even though no airbag was triggered. In addition, aged electronic components, cold solder joints, moisture and corrosion at plug connections, or voltage spikes can lead to failure.

A normal diagnostic tool does not remove the crash data. During the repair by Airbag24, the crash data is deleted.

The other causes concern the electronics and the connections. Solder joints can go cold, components age, and plugs lose their reliable contact through moisture and corrosion. A weak battery or a jump start can also cause voltage spikes.

How can you tell that the 550864500 is defective?

An early sign is the airbag warning light in the instrument cluster, which lights up permanently or only intermittently. In addition, a fault message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then not deploy in an emergency.

If you see the warning light, you have received the most important sign, and a check is then advisable.

Only reading out the fault memory shows which cause applies; a plug or a cable are equally possible.

Which vehicles is the 550864500 fitted in?

Compare your vehicle with the list before you remove a unit. The airbag control unit 550864500 is fitted in these vehicles: Peugeot 306 I Facelift (1997-2002) and I (1993-1997).

The list shows the vehicles that belong to this number in our data. It is set out as follows:

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

Comparing the part number on the label with this page only confirms that the unit is the right one. Have the fault memory read out beforehand, because only its log shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 9620732580, 9621996780, 9628740380, 9628740480, 963205180, 9632052080.

How does the repair of the 550864500 work?

First comes the fault memory, which you have read out; you enclose the log. Then you disconnect the battery and only afterwards remove the control unit. Next you create the repair order online and pack the unit well for sending. At Airbag24 processing usually takes 3–4 working days.

At the test bench Airbag24 checks the unit, defective components are replaced, the crash data is deleted and a function test is carried out. The stated time refers only to these steps; afterwards your own unit is returned.

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 550864500 get to Airbag24?

You hand in the unit as a parcel, or for an extra charge you book a UPS collection. The return after the repair is also made by UPS.

The printed repair order is enclosed in the parcel, and the unit is packed shockproof.