Airbag control unit with part number 1EA 959 655 FB

What does the airbag control unit 1EA 959 655 FB do?

The control unit 1EA 959 655 FB controls the restraint system of Cupra. It processes what the crash sensors report and, in an accident, triggers the appropriate airbags and seatbelt pretensioners within milliseconds.

At the same time, it monitors the entire system and displays faults via the airbag warning light.

After an accident, it stores crash data and locks itself.

Why does the control unit 1EA 959 655 FB fail?

Crash data stored after an accident is the most common cause of a failure, even if no airbag has triggered. Other causes include aged electronic components, moisture and corrosion on plug connections, cold solder joints, and voltage spikes, for example from a weak battery.

Crash data remains inaccessible to a normal diagnostic tool. Airbag24 erases it as part of the repair.

Internal damage caused by ageing, moisture or voltage cannot be repaired on control units with a 1EA number.

How can you tell that the 1EA 959 655 FB is defective?

Typical signs are an airbag warning light in the instrument cluster that stays on permanently or lights up intermittently, and fault messages there. In addition, the diagnostic tool may be unable to connect to the control unit, or the fault memory cannot be cleared.

Such signs mean that airbags and seatbelt pretensioners may not deploy in an emergency.

The following hints help with the assessment:

• Warning light permanently on or lighting up intermittently
• Fault message in the instrument cluster
• No connection established with the diagnostic tool
• Fault memory cannot be cleared

Which vehicles is the 1EA 959 655 FB fitted in?

The 1EA 959 655 FB is fitted in these vehicles: Cupra Leon KL (2020-2023) and KL Facelift (from 2024). You rule out mix-ups with similar units by comparing the label.

The vehicles listed in the data for this part number are shown here:

• Cupra Leon KL (2020-2023)
• Cupra Leon KL Facelift (from 2024)

Before removal, two separate checks will help you. First compare the part number on the label with this page. Then have the fault memory read out, because only the log shows whether the control unit is defective or whether a plug or cable is behind it. If B2000 is shown, no repair is possible, and you do not send the unit in.

For the same vehicles, we also repair control units with the part numbers 1EA 959 655 DQ, 1EA 959 655 EP, 1EA 959 655 FE.

How does the repair of the 1EA 959 655 FB work?

The process begins with reading out the fault memory, and you enclose the log. Then disconnect the battery and remove the control unit. Next, create a repair order online and send in the well-packed unit. For checking, erasing and testing, Airbag24 usually needs 3–4 working days.

At Airbag24, the unit is checked, the stored crash data is erased and a function test follows. Afterwards your own unit is returned.

If fault entry B2000 is present, no repair is possible for control units with a 1EA number.

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 1EA 959 655 FB get to Airbag24?

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

Put the printed repair order into the parcel and pack the unit shockproof.