Airbag control unit with part number 5QS959655B

What does the airbag control unit 5QS959655B do?

The airbag control unit 5QS959655B is the central link of the restraint system in Volkswagen: it evaluates the crash sensors and decides within milliseconds in a crash. Faults appear on the airbag warning light. After a crash, it stores crash data and locks itself.

Monitoring runs without pause for as long as the ignition is switched on.

Detected faults end up in the unit's fault memory and remain retrievable there for diagnosis.

Why does the control unit 5QS959655B fail?

Causes with the 5QS959655B: stored crash data from an accident is regarded as the most common cause, even without a triggered airbag. Aged components, moisture and voltage spikes follow as further triggers. With this control unit, it is often not possible to erase the crash data; if you would like it erased, get in touch with Airbag24 briefly before sending the unit in.

Crash data remains in the control unit, and a normal diagnostic tool cannot erase it. As a result, the unit reports faults even when the electronics themselves are undamaged.

Aged electronics, cold solder joints and moisture on the plugs are also among the possible causes. Voltage spikes, for example from a weak battery or a jump start, place additional strain on the unit.

How can you tell that the 5QS959655B is defective?

Signs at the 5QS959655B: the airbag warning light in the instrument cluster stays on permanently or intermittently and so indicates a fault. A diagnostic tool that cannot establish a connection, or a fault memory that cannot be emptied, are further signs. In an actual crash, the airbags and seatbelt pretensioners may then fail to deploy.

The warning light is the direct signal the system gives. It calls for an inspection before you rely on the function.

A missing connection to the diagnostic tool, or a memory that cannot be emptied, also points to a fault.

Which vehicles is the 5QS959655B fitted in?

The 5QS959655B is fitted in these vehicles: Volkswagen Multivan T7 (from 2021); Volkswagen Crafter SZ (from 2017). The assignment is shown in the list below.

The vehicles that match this part number are shown here:

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

Check the part number on the control unit's label against this page, so that you know it is the correct unit. Have the fault memory read out beforehand, as only it shows whether the control unit itself is defective or whether a connector or cable is the cause.

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

How does the repair of the 5QS959655B work?

Procedure for repairing the 5QS959655B: have the fault memory read out and keep the log, then disconnect the battery and only then remove the control unit. Next, create a repair order online and send in the well-packed unit; processing at Airbag24 usually takes 3–4 working days.

At the test bench at Airbag24, the unit is checked, defective components are replaced and a functional test follows at the end. Afterwards you receive the unit back.

If you would like the crash data erased, get in touch with Airbag24 briefly before sending the unit in. The sequence of steps protects 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 5QS959655B get to Airbag24?

Transport of the 5QS959655B: for sending it in, you choose the parcel or a UPS collection, which you book for an extra charge. The unit comes back by UPS after the repair.

Enclose the printed repair order; then pack the unit shockproof.