Airbag control unit with part number 1EA 959 655 CK

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

The airbag control unit 1EA 959 655 CK is the central control unit of the restraint system (SRS) for Seat. It evaluates the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners to trigger. After an accident it stores crash data and locks itself.

During operation, the control unit monitors the entire system. Faults are reported via the airbag warning light in the instrument cluster, so you notice a failure early.

The lock is only lifted by the repair. You will find more on this in the repair section further down this page.

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

The most common cause for control unit 1EA 959 655 CK is crash data stored after an accident, even if no airbag has triggered. Other causes are aged electronic components, moisture and corrosion on plug connections, and voltage spikes, for example from a weak battery or jump-starting.

Crash data cannot be erased with a normal diagnostic tool.

Aged components, cold solder joints and moisture on plug connections can impair the electronics over time. Voltage spikes can also lead to failure.

An internal defect of this kind cannot be repaired on control units with a 1EA number. For these units, Airbag24 only offers erasing the stored crash data.

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

You recognise a defect in the 1EA 959 655 CK by the airbag warning light in the instrument cluster staying on permanently or lighting up intermittently, by a fault message in the instrument cluster, by the diagnostic tool being unable to connect to the control unit, or by a fault memory that cannot be cleared.

• Airbag warning light in the instrument cluster stays on or lights up intermittently
• Fault message in the instrument cluster
• Diagnostic tool cannot establish a connection with the control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may then fail to deploy. Have the fault memory read out promptly rather than ignoring the warning light.

The warning light is not a minor matter; it is the system's direct message to you.

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

The control unit 1EA 959 655 CK is fitted in these vehicles: Seat Leon 4 [KL] (from 2020).

This list serves for assignment:

• Seat Leon 4 [KL] (from 2020)

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. Also have the fault memory read out beforehand, because only the log shows whether the control unit is defective or whether a plug or cable is the cause. If B2000 ("control unit defective") 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 ED, 3Q0 959 655 CM, 3Q0959655AB.

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

First have the fault memory read out and enclose the log. Then disconnect the battery and only after that remove control unit 1EA 959 655 CK. Next, create a repair order online and send the well-packed unit in. 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 to you.

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 CK get to Airbag24?

You send control unit 1EA 959 655 CK 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 unit shockproof.