Airbag control unit with part number P9472941

What does the airbag control unit P9472941 do?

The airbag control unit P9472941 is the central control unit of the restraint system for Volvo. It evaluates the crash sensors, decides in a crash within milliseconds on airbags and seatbelt pretensioners and monitors the system permanently. After a crash it stores crash data and locks itself.

The housing additionally bears the manufacturer's number Bosch 0285001258.

The unit reports faults via the airbag warning light in the instrument cluster, so drivers can keep an eye on the state of the system.

Why does the control unit P9472941 fail?

Most often stored crash data is the cause, even if no airbag fired; a normal diagnostic tool cannot erase these entries. Ageing electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes also play a role.

The unit records these entries itself at the time of the incident, regardless of whether the airbags fired.

The remaining causes lie in the electronics and their environment. Components age, solder joints can go cold, and moisture attacks plug connectors.

Voltage spikes, for example from a weak battery or jump-starting, put additional strain on the circuitry. Only the investigation shows which cause applies in the individual case.

How can you tell that the P9472941 is defective?

The airbag warning light in the instrument cluster stays on constantly or intermittently, an error message also appears, the diagnostic tool gets no connection to the control unit, or the fault memory cannot be cleared. In that case, airbags and seatbelt pretensioners may possibly not deploy in an emergency.

The warning light is the most visible sign of a fault. When it lights up, make sure the fault memory is read out promptly.

If no connection to the diagnostic tool can be made, the fault lies in communication. That can be due to the control unit or to the wiring between them, and the readout shows which of the two it is.

Which vehicles is the P9472941 fitted in?

Anyone who wants to check whether their car fits will find the answer here. The control unit P9472941 is fitted for Volvo in these vehicles: Volvo S80 TS (1998-2003) and TS Facelift (2003-2006).

An overview follows as a list:

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

Two tips help. First, compare the part number on the label of the unit after removal with this page. That only shows that it is the right unit. Second, have the fault memory read out before anything else, because only the result shows whether the control unit or a plug or 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 P9472941 work?

You have the fault memory read out and attach the log to the parcel, then disconnect the battery. Only then do you remove the control unit P9472941 and create the repair order online. Then you send the unit in, well packed.

Airbag24 examines the submitted unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days.

Afterwards your own unit returns to you. The order of steps is mandatory for safety reasons.

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 P9472941 get to Airbag24?

You send the control unit P9472941 as a parcel, or alternatively book a UPS collection for an extra charge. After repair it reaches you again by UPS.

Put the printed repair order in the parcel and pack the control unit shock-proof.