Airbag control unit with part number 1EA 959 655 ED

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

The airbag control unit 1EA 959 655 ED is the central control unit of the restraint system (SRS) of Volkswagen, Seat and Cupra. It receives the signals from the crash sensors and, in an accident, decides within milliseconds on the triggering of airbags and seatbelt pretensioners.

It monitors the system continuously and reports faults via the airbag warning light in the instrument cluster.

After an accident, the unit stores crash data and locks itself.

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

The most common cause is crash data stored in the unit after an accident, even if no airbag has triggered. Aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes can also occur.

A normal diagnostic tool does not erase crash data. Airbag24 therefore takes over the erasing as part of the repair.

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

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

A defect first shows itself by the airbag warning light staying on permanently or lighting up intermittently. In addition, fault messages appear in the instrument cluster, and the diagnostic tool may find no connection to the control unit.

• Airbag warning light on permanently or intermittently
• Fault message in the instrument cluster
• No connection to the diagnostic tool
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may then fail to deploy as a result.

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

The 1EA 959 655 ED is fitted in these vehicles: Volkswagen Caddy SB (from 2020); Seat Leon 4 [KL] (from 2020); Cupra Formentor KM (2020-2024) and KM Facelift (from 2024). The details are based on the part number data on this page.

The models stored for this part number are listed in the following overview:

• Volkswagen Caddy SB (from 2020)
• Seat Leon 4 [KL] (from 2020)
• Cupra Formentor KM (2020-2024)
• Cupra Formentor KM Facelift (from 2024)

If the part number on the label of the removed unit matches this page, the unit is clearly identified. Also 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 AD, 1EA 959 655 BJ, 1EA 959 655 CH, 1EA 959 655 CK, 1EA 959 655 DD, 1EA 959 655 DM.

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

First have the fault memory read out and enclose the log. Then disconnect the battery, remove the control unit and create a repair order online. Then send the well-packed unit in; processing at Airbag24 usually takes 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 B2000 is entered in the fault memory, 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 ED get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Pack the unit shockproof and enclose the printed repair order.