Airbag control unit with part number YWJ000220

What does the airbag control unit YWJ000220 do?

The airbag control unit YWJ000220 is the control center of the restraint system (SRS) in MG vehicles. It processes the data from the crash sensors, selects the correct airbags and seatbelt pretensioners within milliseconds in an accident, and displays faults via the airbag warning light.

The unit checks the entire system continuously. This includes the sensors, the trigger circuits of the airbags and seatbelt pretensioners, and the connections between them.

After an accident, the control unit stores crash data and locks itself. Repair is the only way to lift this lock.

Why does the control unit YWJ000220 fail?

Most often the cause is crash data stored in the unit after an accident, even if no airbag was triggered. This data cannot be erased with a normal diagnostic tool. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data is the most important source of faults, because it occupies the memory even when nothing is visible from the outside. Such an entry can only be removed during the repair.

Aged solder joints or corroded plugs may only show up under load. A weak battery or jump-starting can put additional strain on the electronics, and the inspection will establish whether that plays a role.

How can you tell that the YWJ000220 is defective?

A fault shows itself through the airbag warning light, a fault message in the instrument cluster and problems with the diagnostic tool. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

Typical signs are:

• the airbag warning light, which stays on permanently or only at times,
• a fault message in the instrument cluster,
• no connection between the diagnostic tool and the control unit,
• a fault memory that cannot be cleared.

The warning light points directly to the fault. A check is therefore advisable as soon as any of these signs appears.

Which vehicles is the YWJ000220 fitted in?

The airbag control unit YWJ000220 is fitted in these vehicles: MG ZT RJ (2001-2005).

Here follows the assignment as it is stored for this part number.

• MG ZT RJ (2001-2005)

Compare the part number on the label of the removed unit with this page. That way you can be sure it is the right unit. You should have the fault memory read out beforehand, because only its contents show whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers YWC107090, YWJ101590.

How does the repair of the YWJ000220 work?

First have the fault memory read out and enclose the report. Then disconnect the battery and only then remove the control unit. Afterwards, create a repair order online and send the unit in well packed. Airbag24 checks it, repairs defective components, erases the crash data and tests the function.

The sequence is mandatory for safety reasons, because the control unit may only be removed after the battery has been disconnected. Airbag24 usually needs 3–4 working days for checking, repairing and testing.

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 YWJ000220 get to Airbag24?

You send the unit as a parcel or, for an extra charge, book a UPS collection. Airbag24 then returns the repaired unit by UPS.

Place the printed repair order in the parcel. The control unit should be packed shock-proof.