Airbag control unit with part number 1EA 959 655 DM

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

The airbag control unit 1EA 959 655 DM is the control unit of the restraint system (SRS) in Volkswagen. It evaluates what the crash sensors report and decides whether airbags and seatbelt pretensioners are triggered.

The decision is made in milliseconds during an accident. In between, the device monitors the system continuously; faults appear via the airbag warning light.

After an accident it stores crash data and then locks itself.

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

The most common cause is crash data stored after an accident, even without an airbag having been triggered. It cannot be erased with a normal diagnostic tool; Airbag24 erases it during the repair.

Other causes include ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery.

For control units with a 1EA number, such internal faults cannot be repaired.

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

The airbag warning light in the instrument cluster indicates the fault by lighting up permanently or intermittently. A fault message in the instrument cluster is also a sign.

If the diagnostic tool has no connection to the control unit, or the fault memory cannot be cleared, that is a further indication.

In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

• Warning light permanently or intermittently on
• Fault message in the instrument cluster
• Diagnostic tool without connection
• Fault memory cannot be cleared

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

The 1EA 959 655 DM is fitted in these vehicles: Volkswagen Caddy SB (from 2020). The details come from the stored part number data.

The vehicle list for this part number follows here:

• Volkswagen Caddy SB (from 2020)

You should do the label comparison before removal: if the number on the device matches this page, you have the right control unit. The fault memory then shows whether the control unit is defective or whether a plug or cable is the cause, so have it read out beforehand. If B2000 is shown there, no repair is possible and you do not send in the device.

For the same vehicles, we also repair control units with the part numbers 1EA 959 655 DD, 1EA 959 655 ED, 2H0959655B, 3AA919041A, 6Q0 909 605 AJ.

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

You have the fault memory read out and enclose the log, disconnect the battery and remove the control unit. Then you create a repair order online and send the device well packed. At Airbag24 processing usually takes 3–4 working days.

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

If the fault entry B2000 is present, there is no repair 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 DM get to Airbag24?

You send the device as a parcel, or for an extra charge you book a UPS collection. The return after the repair also goes by UPS.

The printed repair order goes into the parcel; pack the control unit shock-proof.