Airbag control unit with part number 4KE959655H

What does the airbag control unit 4KE959655H do?

The airbag control unit 4KE959655H is the central control unit of the restraint system (SRS) for Audi. Here the signals from the crash sensors come together, and within milliseconds the unit decides in a crash which airbags and seatbelt pretensioners fire. After an accident, it stores crash data and locks itself.

It also checks the system continuously and shows faults via the airbag warning light.

The fact that airbags and seatbelt pretensioners are controlled jointly by this unit makes it a safety-relevant component.

Why does the control unit 4KE959655H fail?

For 4KE959655H, the most common cause is a crash data situation stored after an accident, even without a deployed airbag; a normal diagnostic tool cannot remove it. Further causes in brief:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or jump starting

Whether crash data are stored is only shown by reading out the fault memory.

How can you tell that the 4KE959655H is defective?

In case of a defect on the 4KE959655H, the airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears. The diagnostic tool finds no access to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

Cables and plugs can also produce such signs; the diagnosis separates the causes.

Which vehicles is the 4KE959655H fitted in?

The control unit 4KE959655H is used in these vehicles: Audi Q7 4M (2015-2019) and 4M Facelift (2019-2024); Audi SQ7 4M (2016-2019) and 4M Facelift (from 2019).

Here is the list of vehicles for this part number:

• Audi Q7 4M (2015-2019)
• Audi Q7 4M Facelift (2019-2024)
• Audi SQ7 4M (2016-2019)
• Audi SQ7 4M Facelift (from 2019)

Comparing the part number on the label with this page only confirms that you have the right unit. It is also advisable to have the fault memory read out before removal, because only the log shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 4KE959655B, 4KE959655J, 4KE959655L, 4M0 959 655 AF, 4M0 959 655 G, 4M0 959 655 K.

How does the repair of the 4KE959655H work?

For 4KE959655H, proceed as follows: have the fault memory read out, enclose the log, disconnect the battery, and only then remove the control unit. Create the repair order online and send the unit in, well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 examines the unit on the test bench, repairs defective components, removes the stored crash data and carries out a function test; afterwards your own unit goes back 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 4KE959655H get to Airbag24?

For the control unit 4KE959655H there are two shipping options: you send it as a parcel, or you book a UPS collection for an extra charge. The return after the repair is also made by UPS.

A printed repair order belongs in the parcel; pack the unit shockproof before UPS takes it.