Airbag control unit with part number 1EA 959 655 DD

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

The airbag control unit 1EA 959 655 DD coordinates the restraint system (SRS) of Volkswagen. It evaluates signals from the crash sensors, decides on airbags and seatbelt pretensioners within milliseconds in a crash, and monitors the system continuously. After an accident, it stores crash data and locks itself.

It reports faults via the airbag warning light in the instrument cluster. This tells you that something in the system is wrong before it becomes serious.

The lock is only lifted by the repair.

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

The most common cause for the 1EA 959 655 DD is crash data stored after an accident, even if no airbag has triggered. In addition there are aged components, moisture and corrosion on plug connections, cold solder joints and voltage spikes, for example from jump-starting.

Crash data remains in the memory, and a standard diagnostic tool cannot erase it.

Solder joints, plug connections and components are among the general causes that can affect the electronics over time.

On control units with a 1EA part number, an internal defect cannot be repaired. Airbag24 offers only the erasure of stored crash data for these units.

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

On the 1EA 959 655 DD, you recognise a defect by the airbag warning light, which lights up permanently or intermittently, by a fault message in the instrument cluster, by a missing connection of the diagnostic tool to the control unit, or by a fault memory that cannot be erased.

Typical signs are:

• Airbag warning light lights up permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool finds no connection to the control unit
• Fault memory cannot be erased

In an emergency, airbags and seatbelt pretensioners may therefore fail to trigger. A look into the fault memory will show what is present.

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

The 1EA 959 655 DD is fitted in these vehicles: Volkswagen Caddy SB (from 2020).

As a list, the assignment looks like this:

• Volkswagen Caddy SB (from 2020)

Compare the part number on the label of the removed unit with this page. That only confirms that it is the correct unit. 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") appears, 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 DM, 1EA 959 655 ED, 2H0959655B, 3AA919041A, 6Q0 909 605 AJ.

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

First have the fault memory read out and enclose the log. Then disconnect the battery and only after that remove the control unit 1EA 959 655 DD. 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 the unit comes back.

If fault B2000 is stored, no repair is possible for control units with a 1EA part 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 DD get to Airbag24?

You send the control unit 1EA 959 655 DD to Airbag24 as a parcel or book a UPS collection for an extra charge. Airbag24 returns the unit by UPS after the repair.

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