Airbag control unit with part number 1EA 959 655 EP

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

The airbag control unit 1EA 959 655 EP evaluates the sensors of the restraint system (SRS) installed in the Cupra. In an accident, it decides within fractions of a second which airbags and seatbelt pretensioners fire.

The electronics check their own functions continuously. If they detect a fault, the airbag warning light shows it.

If an accident has occurred, the control unit writes crash data to memory and then locks itself.

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

The most common cause is crash data stored after an accident, even if no airbag has triggered. Aged components, moisture at plug connections and voltage spikes are also involved.

Crash data cannot be removed by a normal diagnosis. Airbag24 therefore erases it during the repair.

Corrosion, cold solder joints and voltage spikes, for example with a weak battery or jump-starting, can cause internal faults. Such internal faults cannot be repaired on control units with a 1EA number.

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

A defect shows itself by the airbag warning light in the instrument cluster staying on permanently or lighting up intermittently. A fault message in the instrument cluster appears alongside it.

If you connect a diagnostic tool and no connection is established, or the fault memory cannot be cleared, this points to the control unit.

In an emergency, airbags and seatbelt pretensioners may then fail to deploy. The warning light is there precisely to make a fault visible.

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

The 1EA 959 655 EP is fitted in these vehicles: Cupra Leon KL (2020-2023) and KL Facelift (from 2024); Cupra Formentor KM (2020-2024) and KM Facelift (from 2024). The details are based on the stored part number data.

An overview of the stored models is available here:

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

Check the part number on the label of the removed unit against this page; this only ensures that you have the right unit. Have the fault memory read out, because only the result shows whether the control unit is defective or whether a plug or cable is the cause. If B2000 is shown, no repair is possible; then do not send the unit in.

For the same vehicles, we also repair control units with the part numbers 1EA 959 655 BJ, 1EA 959 655 DP, 1EA 959 655 DQ, 1EA 959 655 ED, 1EA 959 655 FB, 1EA 959 655 FD.

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

The process begins with reading out the fault memory, with the log enclosed. Only after that come disconnecting the battery and removing the control unit. Finally, create the repair order online and send the unit in; processing at Airbag24 usually takes 3–4 working days.

At Airbag24, the stored crash data is erased during processing, followed by a function test. The unit then goes back to you.

If B2000 is recorded in the fault memory, a repair is ruled out 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 EP get to Airbag24?

One parcel is enough; alternatively, you book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back by UPS.

Pack the control unit shockproof and enclose the printed repair order.