Airbag control unit with part number 1EA 959 655 ER

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

The airbag control unit 1EA 959 655 ER forms the control centre of the restraint system (SRS) of Volkswagen. It checks the signals from the crash sensors, decides in an accident within milliseconds which airbags and seatbelt pretensioners fire, and monitors the system continuously. After an accident it stores crash data and locks itself.

The control unit records faults found in the fault memory and lights the airbag warning light in the instrument cluster.

The lock is only lifted by the repair. The same control unit triggers the seatbelt pretensioners, which is why it belongs to the safety-relevant electronics of the vehicle.

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

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

Stored crash data cannot be removed with a normal diagnostic tool.

Components age over time, solder joints can turn cold, and moisture attacks plug connections. Voltage spikes also stress the electronics.

Such an internal defect cannot be repaired on 1EA control units. For these units, Airbag24 only offers erasing the crash data.

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

A defect on the 1EA 959 655 ER shows when the airbag warning light stays on permanently or lights up intermittently, a fault message appears in the instrument cluster, the diagnostic tool cannot connect to the control unit, or the fault memory cannot be cleared.

The warning light in the instrument cluster indicates the fault as soon as it stays on permanently or lights up only intermittently. If a fault message also appears in the instrument cluster, there is no doubt that the system has detected something.

If the diagnostic tool cannot connect, or the fault memory keeps its entries, this is a sign you should not ignore. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

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

The control unit 1EA 959 655 ER is fitted in these vehicles: Volkswagen ID.3 E1 (2019-2023) and E1 Facelift (from 2023).

This list shows the assignment, which you can go through line by line:

• Volkswagen ID.3 E1 (2019-2023)
• Volkswagen ID.3 E1 Facelift (from 2023)

Compare the part number on the label of the removed unit with this page. The comparison only confirms that it is the right unit. Before sending it in, have the fault memory read out, because only the result shows whether the control unit itself is defective or whether a plug or cable is the cause. If the entry reads B2000 ("control unit defective"), 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 CD, 1EA 959 655 DR.

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

First read out the fault memory and enclose the log. Then disconnect the battery, and only then remove control unit 1EA 959 655 ER. Next, create a repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, erases the stored crash data and carries out a function test. Processing usually takes 3–4 working days. Afterwards your own unit comes back 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 ER get to Airbag24?

You send control unit 1EA 959 655 ER as a parcel to Airbag24, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back by UPS.

Pack the unit shockproof and enclose the printed repair order.