DS Automobiles DS N°4 airbag control unit repair⁽¹⁾

What should you know about DS Automobiles DS N°4 airbag control units?

The airbag control unit of the DS N°4 evaluates the crash sensors, triggers the airbags and belt tensioners in an emergency and monitors the entire restraint system. If the system detects a fault, the airbag warning light comes on. Airbag24 repairs the control unit you send in.

After an accident, the control unit stores crash data and locks itself. A defective control unit can prevent the airbags from deploying as intended in an emergency. A fault in the airbag system should therefore be checked promptly.

Airbag technology is safety-relevant. Testing, removal and repair should therefore be left to a specialist workshop. Airbag24 erases the crash data and checks the unit for faults before the repair begins.

Which DS Automobiles DS N°4 generations are there?

The DS N°4 is the revised and renamed version of the DS 4. It is available in Europe as series I, which has been built since 2025 and is still in production.

The name DS N°4 has applied since the facelift that was unveiled in 2025. For repairs, the exact version of the control unit matters, not the model name alone. The series designation helps with a first classification.

• I (since 2025, still in production) – the current series of the DS N°4 after the facelift.

How do I identify my DS Automobiles DS N°4 airbag control unit?

The part number on the control unit's label determines the exact version. The model year and equipment of your vehicle help to confirm the assignment.

The label on the housing shows the part number, which distinguishes different versions. The vehicle identification number (VIN) of your car supplements these details and helps with the assignment.

A fault code from the fault memory is a clue, but on its own it does not prove a defect. For this model, the following fault codes are known from verified sources:

• B0091: fault in the left satellite line of the side impact sensor, such as an open circuit or an internal sensor fault
• B00D5: fault in the warning lamp of the front passenger airbag deactivation

Only testing in the workshop shows whether a control unit is actually defective.

Which airbag equipment does the DS Automobiles DS N°4 have?

Which airbags are fitted to the DS N°4 depends on trim level, market and model year. Front, side and head airbags are common in current compact cars; the exact configuration of your vehicle is set out in the manufacturer's documentation.

The airbag system works together with sensors and the control unit. The sensors detect the impact, and the control unit decides which modules are triggered. Belt tensioners are triggered as well.

If the warning light stays on, have the fault memory read out promptly.

The route to repair: have the fault memory read out. The battery is disconnected before removal, and removal should be carried out by a specialist workshop. Then create a repair order online and send the control unit to us by parcel. Processing usually takes 3–4 working days for inspection, repair and testing.

The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — coding or programming is not necessary.