Airbag control unit with part number 851126

What does the airbag control unit 851126 do?

The airbag control unit 851126 is the central unit of the restraint system (SRS) of Ferrari. It measures through the crash sensors what happens in an impact and triggers the appropriate airbags and seatbelt pretensioners within milliseconds. After an accident it stores crash data and locks itself.

The unit monitors the system continuously. Faults it finds are logged in the fault memory and made visible by the airbag warning light.

If it fails, the restraint system may not react reliably in an emergency.

Why does the control unit 851126 fail?

Stored crash data after an accident is the most common cause with the 851126, even without a triggered airbag; a normal diagnostic tool cannot remove it. The other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

The memory in which the crash data is held is located in the control unit itself.

Faults can also begin with a small contact problem. A precise diagnosis is therefore indispensable.

How can you tell that the 851126 is defective?

You recognise a defect in the 851126 by the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Fault messages in the instrument cluster accompany it, the diagnostic tool does not find the control unit, and the fault memory cannot be cleared.

• Airbag warning light in the instrument cluster, permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool does not find the control unit
• Fault memory cannot be cleared

With this finding, the airbags and seatbelt pretensioners may not be able to deploy in an emergency. The warning should therefore be checked promptly.

Which vehicles is the 851126 fitted in?

The 851126 is fitted in these vehicles: Ferrari Roma Spider F169 (2023-2026). The details come from the assignment to this part number.

The assignment covers the following vehicles:

• Ferrari Roma Spider F169 (2023-2026)

Compare the part number on the label of the removed unit with this page to make sure you have the right unit. This alone does not clarify the cause. Having the fault memory read out, however, shows whether the control unit is defective or whether a plug or cable is the cause.

How does the repair of the 851126 work?

Airbag24 usually processes the 851126 within 3–4 working days. The checking, the repair of defective components and the function test take place with us.

Beforehand, you read out the fault memory and enclose the log. Only then do you disconnect the battery and remove the control unit. Next, you create a repair order online and send the unit in well packed.

Stored crash data is erased by Airbag24 on this occasion. Your own unit then goes back 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 851126 get to Airbag24?

The 851126 reaches Airbag24 either as a parcel or through a UPS collection booked for an extra charge. After the repair, Airbag24 sends it back by UPS.

Enclose the printed repair order with the parcel, and pack the control unit shock-resistant.