Airbag control unit with part number 1EA 959 655 CH

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

The airbag control unit 1EA 959 655 CH is the central control unit of the SRS, the restraint system in the Seat. It checks the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners to trigger.

During operation, the self-monitoring runs continuously. Faults found are reported via the airbag warning light.

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

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

Crash data stored after an accident is the most common cause of failure, even if no airbag has triggered. A normal diagnostic tool cannot erase it.

In addition, aged components, moisture and corrosion on plug connections, cold solder joints and voltage spikes are possible triggers, for example with a weak battery or when a jump-start is connected.

An internal defect of this kind cannot be repaired on control units with a 1EA number. Airbag24 does erase the crash data during the repair.

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

The airbag warning light in the instrument cluster stays on permanently or flickers intermittently, and a fault message appears on the display. If, in addition, no connection to the diagnostic tool is established or the fault memory remains occupied, this indicates a defect.

With such a finding, airbags and seatbelt pretensioners may fail to deploy in an emergency. The warning light is an early signal and not a reason to wait.

A defect is therefore indicated by the warning light, and that is exactly what it is built for.

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

The 1EA 959 655 CH is fitted in these vehicles: Seat Leon 4 [KL] (from 2020). The part number is recorded for these models; further details follow in the list.

The associated vehicles are listed below:

• Seat Leon 4 [KL] (from 2020)

Check the part number on the label against this page; that way you can be sure you have the right unit. Then have the fault memory read out, because only the result shows whether the control unit is defective or whether plugs and cables are the cause. If B2000 is recorded, no repair is possible, so please do not send in the unit.

For the same vehicles, we also repair control units with the part numbers 1EA 959 655 AD, 1EA 959 655 BJ, 1EA 959 655 CK, 1EA 959 655 ED, 3Q0 959 655 CM, 3Q0959655AB.

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

The procedure begins with reading out the fault memory, with the log enclosed. Then disconnect the battery, remove the control unit and create the repair order online. Only then send in the well-packed unit; processing at Airbag24 usually takes 3–4 working days.

At Airbag24, the control unit is checked. The stored crash data is erased, a function test follows, and then 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 CH get to Airbag24?

Either you send the unit as a parcel, or you book a UPS collection for an extra charge. After the repair, the unit goes back to you by UPS.

Enclose the printed repair order with the parcel; the control unit is packed shockproof.