Airbag control unit with part number 4E0 910 655 D

What does the airbag control unit 4E0 910 655 D do?

The airbag control unit 4E0 910 655 D monitors and controls the restraint system (SRS) of Audi. It evaluates crash sensors, determines in an accident the triggering of airbags and seatbelt pretensioners, and checks the system continuously. After an accident, it stores crash data and locks itself.

The triggering decision is made within milliseconds, and the checks run uninterrupted in the background. The unit reports faults via the airbag warning light, so that you can recognise a fault.

The lock ends only with the repair at Airbag24.

Why does the control unit 4E0 910 655 D fail?

The most common cause is crash data stored in the memory after an accident, even if no airbag was triggered; a normal diagnostic tool does not erase it. Other causes include aged electronic components, cold solder joints, moisture and corrosion on plugs, and voltage spikes, for example from a weak battery or jump-starting.

That the crash data do not disappear with a standard diagnostic tool is due to the unit's own memory. Airbag24 removes them during the repair.

The other causes mainly concern the electronics and their connections. A damp plug and a battery that dips sharply when starting affect the unit just as much as ageing.

How can you tell that the 4E0 910 655 D is defective?

A fault shows up as an airbag warning light that stays on permanently or intermittently, as warning messages in the instrument cluster, as a diagnostic tool without connection, and as a fault memory that remains after clearing. In an emergency, airbags and seatbelt pretensioners may then not trigger.

• Airbag warning light stays on permanently or intermittently
• Warning message in the instrument cluster
• Diagnostic tool cannot reach the control unit
• Fault memory remains after the clearing attempt

If one of these signs appears, have the fault memory read out.

Which vehicles is the 4E0 910 655 D fitted in?

The airbag control unit 4E0 910 655 D is fitted in these vehicles: Audi S8 D3 (2006-2008) and D3 Facelift (2008-2010); Audi A8 D3 4E (2002-2005) and D3 4E Facelift (2005-2010).

The vehicles on record for this part number are:

• Audi S8 D3 (2006-2008)
• Audi S8 D3 Facelift (2008-2010)
• Audi A8 D3 4E (2002-2005)
• Audi A8 D3 4E Facelift (2005-2010)

Compare the part number on the label of the removed unit with this page. This only ensures that you have the right unit. The cause is clarified by the fault memory, which you have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 0285001672, 0285001705, 285001512, 285001705, 4E0 959 655 H, 4E0910655.

How does the repair of the 4E0 910 655 D work?

First have the fault memory read out and attach the log, then disconnect the battery and remove the control unit. Next, create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

The sequence is binding for safety reasons: the control unit may only be removed once the battery is disconnected.

Airbag24 checks the unit on the test bench, repairs defective components, erases the crash data and runs 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 4E0 910 655 D get to Airbag24?

You send the control unit as a parcel or book UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

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