Airbag control unit with part number 3T0 959 655 B

What does the airbag control unit 3T0 959 655 B do?

The airbag control unit 3T0 959 655 B controls the restraint system (SRS) of Skoda. It evaluates the crash sensors and, in an accident, triggers the appropriate airbags and seatbelt pretensioners within milliseconds.

Besides this, it monitors all parts of the system continuously. Any faults it detects are shown via the airbag warning light in the instrument cluster.

After an accident, the unit stores crash data and locks itself. This state affects only the control unit itself.

Why does the control unit 3T0 959 655 B fail?

Stored crash data after an accident is the most common cause with the 3T0 959 655 B, even if no airbag has deployed. Other causes include ageing electronics, cold solder joints, moisture and corrosion on connectors, and voltage spikes.

A normal diagnostic tool does not erase crash data. It therefore remains in memory until the repair removes it.

The other causes relate to the components inside the unit. Parts age, solder joints can go cold, and moisture damages connectors. A weak battery or a jump start can cause voltage spikes.

How can you tell that the 3T0 959 655 B is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently. A fault message also appears in the instrument cluster, the diagnostic tool cannot reach the control unit, and the fault memory cannot be cleared.

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

The warning light makes the defect visible. Do not ignore it.

Which vehicles is the 3T0 959 655 B fitted in?

The 3T0 959 655 B is fitted in these vehicles: Skoda Superb 2 [3T] (2008-2013) and 2 [3T] Facelift (2013-2015).

The list below shows the vehicles that belong to this part number.

• Skoda Superb 2 [3T] (2008-2013)
• Skoda Superb 2 [3T] Facelift (2013-2015)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the correct unit. Have the fault memory read out beforehand, because only the log shows whether the control unit or a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 3T0 959 655, 3T0 959 655 A, 3T0 959 655 A1, 3T0 959 655 C.

How does the repair of the 3T0 959 655 B work?

Processing at Airbag24 takes 3–4 working days. Beforehand, you have the fault memory read out, attach the log and disconnect the battery. Only then remove the control unit and create a repair order online.

This order of steps is for safety and must be followed. Then pack the unit well and send it in.

Airbag24 tests the unit on the test bench, replaces defective components, deletes stored crash data and runs a function test. Your own unit is then returned to you.

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 3T0 959 655 B get to Airbag24?

You send the 3T0 959 655 B in as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Include the printed repair order in the parcel. Pack the unit shockproof.