Airbag control unit with part number 1EA 959 655 DQ

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

The airbag control unit 1EA 959 655 DQ controls the restraint system (SRS) of Cupra. It reads the crash sensors and, in an accident, triggers the intended airbags and seatbelt pretensioners within milliseconds.

It also monitors the entire system permanently 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 DQ fail?

Crash data stored after an accident is the most common cause of failure, even if no airbag has triggered. Further triggers are aged electronics, moisture, corrosion on plug connections, cold solder joints and voltage spikes.

Crash data cannot be erased with a normal diagnostic tool. Airbag24 therefore removes it as part of the repair.

Internal defects caused by ageing, moisture or voltage spikes do occur, and on 1EA control units they cannot be repaired.

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

Signs are an airbag warning light in the instrument cluster that stays on permanently or lights up intermittently, and a fault message on the display. In addition, the diagnostic tool may fail to establish a connection.

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

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

A lit warning light is a prompt to have the fault memory read out.

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

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

The following list shows the vehicles for this part number:

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

Compare the part number on the unit with this page, so that you have the right unit in front of you. 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 the reason. If B2000 appears there, no repair is possible, and then do not send the unit in.

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

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

At the start is reading out the fault memory with the log enclosed. Then disconnect the battery and remove the control unit. Next, create the repair order online and send the unit in; processing at Airbag24 usually takes 3–4 working days.

The stored crash data is erased at Airbag24, followed by a function test. Your own unit is then sent back.

If B2000 is stored 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 DQ 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 also made by UPS.

Pack the unit shockproof and enclose the printed repair order.