Airbag control unit with part number 5QS959655S

What does the airbag control unit 5QS959655S do?

The airbag control unit 5QS959655S is the central control unit of the restraint system (SRS) for Volkswagen. It evaluates the crash sensors, decides within milliseconds in an accident whether to trigger airbags and seatbelt pretensioners, and monitors the system continuously. After an accident, it stores crash data and locks itself.

The unit reports faults in the system via the airbag warning light in the instrument cluster. This lets you, as the driver, recognise that something is wrong with the restraint system. The safety of the occupants therefore depends largely on this control unit.

Why does the control unit 5QS959655S fail?

Most common cause with the 5QS959655S: crash data stored after an accident that cannot be erased with a standard diagnostic tool. With this control unit, erasing the crash data is often not possible; if you wish to have it erased, contact Airbag24 briefly before sending the unit in, and Airbag24 will then check the part number. Other causes are ageing of the electronics, moisture and corrosion, and voltage spikes.

Whether an airbag has deployed makes no difference to storage. An accident without airbag deployment can also leave such data behind.

Over time, electronic components age, and cold solder joints can cause intermittent faults. At plug connections, moisture and corrosion lead to contact problems.

Voltage spikes, for example from a weak battery or jump-starting, put additional strain on the unit.

How can you tell that the 5QS959655S is defective?

A fault in the 5QS959655S shows up as the airbag warning light in the instrument cluster. Fault messages may accompany it, the diagnostic tool may fail to connect to the control unit, or the fault memory cannot be cleared.

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

In an emergency, the airbags and seatbelt pretensioners may then fail to deploy. Have the findings checked promptly. Signs of this kind should not be ignored.

Which vehicles is the 5QS959655S fitted in?

The 5QS959655S is fitted in these vehicles: Volkswagen Multivan T7 (from 2021); Volkswagen Crafter SZ (from 2017). To see whether your car is one of them, check the list on this page.

The following vehicles are listed for this part number:

• Volkswagen Multivan T7 (from 2021)
• Volkswagen Crafter SZ (from 2017)

The label check only shows whether you have the right unit in front of you. Whether the control unit is faulty or a connector or cable is the cause is shown only by a fault memory read-out carried out beforehand. Therefore, have it read out before removal.

For the same vehicles, we also repair control units with the part numbers 5QS 959 655 D, A9064461442.

How does the repair of the 5QS959655S work?

First have the fault memory read out and enclose the log; then disconnect the battery and remove the 5QS959655S. You create the repair order online, then send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components and carries out a functional test. This test checks the unit before it is sent back. It then goes back to you. If you want the crash data erased, contact Airbag24 briefly before sending the unit in.

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 5QS959655S get to Airbag24?

You send the 5QS959655S in as a parcel; alternatively, you can book a UPS collection for an extra charge. Airbag24 then sends the repaired unit back to you by UPS.

The printed repair order belongs in the parcel, and the unit should be packed shock-resistant. Make sure the parcel is securely sealed.