Airbag control unit with part number P8622187

What does the airbag control unit P8622187 do?

The airbag control unit P8622187 is the central control unit of the restraint system (SRS) for Volvo. It evaluates the signals from the crash sensors, decides in a crash within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. It shows faults via the airbag warning light.

The control unit works in the background and checks the measured values and the control of the triggers for plausibility on an ongoing basis. In addition, the housing carries the manufacturer number Bosch 0285001256, which appears on the label next to the part number.

After an accident, the unit stores crash data and locks itself. Nothing more needs to be said here.

Why does the control unit P8622187 fail?

Most common cause: crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

The unit records an accident event and keeps the entry. The normal diagnostic tool does not reach it, so the finding remains even after reading out.

Aged electronic components and cold solder joints change the behaviour of the circuits over time. Moisture and corrosion at plug connections weaken the contact, and voltage spikes stress the electronics when the battery is weak or when the vehicle is started with external power.

How can you tell that the P8622187 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, and a fault message appears in the instrument cluster. The diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

• The airbag warning light stays on permanently.
• The airbag warning light comes on only intermittently.
• A fault message about the airbag system appears in the instrument cluster.
• The diagnostic tool does not find the control unit.

You do not have to wait for a check to notice these signs. As soon as one of them occurs, the display itself shows the defect.

Which vehicles is the P8622187 fitted in?

The control unit P8622187 is fitted in these vehicles: Volvo S80 TS (1998-2003) and TS Facelift (2003-2006).

The overview below lists the vehicles recorded for this part number in our data.

• Volvo S80 TS (1998-2003)
• Volvo S80 TS Facelift (2003-2006)

On the one hand, compare the part number on the label of the removed unit with this page. This only shows that you have the right unit. On the other hand, have the fault memory read out before removal. Only this 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 0 285 001 456, 285001254, 285001655, 30721921, 8622368, 8645271.

How does the repair of the P8622187 work?

You have the fault memory read out and enclose the log. Then you disconnect the battery and only afterwards remove the control unit. Next you create a repair order online and send in the well-packed unit.

The order is mandatory for safety reasons. Only once the log is attached and the battery is disconnected does removal begin.

Airbag24 tests the unit on the test bench, replaces defective components and erases stored crash data. A function test follows. Processing usually takes 3–4 working days, and this time applies 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 P8622187 get to Airbag24?

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

Put the printed repair order into the parcel and pack the unit shock-resistant.