Airbag control unit with part number 1EA 959 655 AC

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

The airbag control unit 1EA 959 655 AC is the central control unit of the restraint system (SRS) for Skoda. It evaluates the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered.

During operation, the unit continuously monitors the entire system. If it detects a fault, it reports it via the airbag warning light in the instrument cluster.

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

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

The most common cause is crash data stored after an accident, 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 or jump-starting.

Crash data cannot be erased with a normal diagnostic tool. Airbag24 therefore erases it during the repair.

An internal defect 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 AC is defective?

A defect shows up as the airbag warning light in the instrument cluster staying on permanently or lighting up intermittently. A fault message in the instrument cluster, a diagnostic tool that cannot connect to the control unit, or a fault memory that cannot be cleared also indicate a problem.

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

If the light stays on permanently, reading out the fault memory promptly is the right next step.

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

The control unit 1EA 959 655 AC is fitted in these vehicles: Skoda Octavia 4 [NX] (from 2019) and 4 [NX] Facelift (from 2024). The details come from the stored part number data.

The vehicles stored for this part number can be found here:

• Skoda Octavia 4 [NX] (from 2019)
• Skoda Octavia 4 [NX] Facelift (from 2024)

First compare the part number on the label of the removed unit with this page; this only ensures that you have the right unit in front of you. Then 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 fault B2000 is shown there, no repair is possible; do not send the unit in then.

For the same vehicles, we also repair control units with the part numbers 1EA 959 655 FA, 1EA 959 655 T, 1EA959655AB, 1EA959655BM, 1EA959655CG, 1EA959655DF.

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

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and send in the well-packed unit; processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, erases the stored crash data and carries out a function test. Afterwards your own unit is returned.

If fault 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 AC get to Airbag24?

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

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