Airbag control unit with part number NX7T-14B321-AB

What does the airbag control unit NX7T-14B321-AB do?

As a central unit, the airbag control unit NX7T-14B321-AB controls the restraint system (SRS) of Ford. It checks the signals from the crash sensors, decides in an accident within fractions of a second on the airbags and seatbelt pretensioners, and monitors the entire system. It shows faults via the airbag warning light.

Faults end up in the fault memory, which a workshop or a diagnostic tool can read out.

After an accident, the control unit stores crash data and locks itself. The monitoring covers the entire restraint system, not just individual parts of it.

Why does the control unit NX7T-14B321-AB fail?

Stored crash data is the most common cause on the NX7T-14B321-AB, even if no airbag has deployed. Other causes are aged components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes. With this control unit, deleting the crash data is often not possible; if you would like it deleted, contact Airbag24 briefly before sending the unit in, so that it can check the part number.

In addition to the crash data, the following points are possible:

• aged electronic components
• cold solder joints on the circuit board
• moisture and corrosion at plug connectors
• voltage spikes, for example from a weak battery or a jump start

Only an examination will clarify which of these points actually applies.

How can you tell that the NX7T-14B321-AB is defective?

The airbag warning light in the instrument cluster lights up on the NX7T-14B321-AB, either permanently or intermittently. This comes with a fault message in the instrument cluster and a diagnostic tool that cannot establish a connection to the control unit; in addition, the fault memory cannot be cleared.

In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

A lit warning light is therefore a clear reason to have the system checked. The warning light is one of the indicators you should keep an eye on in the instrument cluster.

Which vehicles is the NX7T-14B321-AB fitted in?

The control unit NX7T-14B321-AB is fitted in these vehicles: Ford Mustang Mach-E 1 (from 2020). This list can clarify whether your vehicle is one of them.

The vehicles at a glance:

• Ford Mustang Mach-E 1 (from 2020)

Compare the part number on the label of the removed unit with this page, to be sure that it is the right unit. Also have the fault memory read out before removal, because only this result shows whether the control unit is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers LL1Z-14B321-B.

How does the repair of the NX7T-14B321-AB work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit. Then create a repair order online and send the unit in, well packed. Airbag24 checks the NX7T-14B321-AB on the test bench, replaces defective components and carries out a function test; processing at Airbag24 usually takes 3–4 working days.

The order of these steps is part of the safety requirements for work on the airbag system. It applies to every removal.

If you would like the crash data deleted, contact Airbag24 briefly before sending the unit in.

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 NX7T-14B321-AB get to Airbag24?

You send the control unit NX7T-14B321-AB in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

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