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

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

As the airbag control unit NX7T-14B321-AC, this unit is the central element of the restraint system (SRS) of Ford. It evaluates the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners to trigger.

It monitors the system continuously. If it detects a fault, it reports it via the airbag warning light in the instrument cluster.

After an accident, it stores crash data and locks itself.

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

The most common cause is that the NX7T-14B321-AC stores crash data after an accident, even if no airbag has deployed. Other causes include aged components, cold solder joints, moisture and voltage spikes. With this control unit, deleting the crash data is often not possible; if you would like it deleted, please contact Airbag24 briefly before sending it in.

Over time, electronic components can age and cause faults. Cold solder joints can lead to intermittent contact problems.

Moisture and corrosion on plug connections disrupt the contact. Voltage spikes, for example from a weak battery or a jump start, can stress the electronics.

Only the evaluation of the fault memory shows whether one of these causes is present.

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

The airbag warning light in the instrument cluster lights up permanently or intermittently when there is a defect in the NX7T-14B321-AC. In addition, there is an error message in the instrument cluster, a diagnostic tool without a connection to the control unit and a fault memory that cannot be cleared.

Even an intermittent light indicates a fault. In an emergency, airbags and seatbelt pretensioners may then not deploy. That is why the warning must be taken seriously, even if the vehicle otherwise runs normally.

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

The control unit NX7T-14B321-AC is a component for vehicles of the Ford brand. It is fitted in these vehicles: Ford Mustang Mach-E 1 (from 2020).

The individual vehicles are shown in this list:

• Ford Mustang Mach-E 1 (from 2020)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the correct unit. If the numbers do not match, clarify this before sending the unit in. Also have the fault memory read out before you remove the unit. Only this shows whether the control unit is defective or a connector or cable is the cause. A defect cannot be confirmed before the fault memory has been read.

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

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

For the repair of the NX7T-14B321-AC, first have the fault memory read out and include the report in the parcel. Then disconnect the battery, remove the control unit, create a repair order online and send in the securely packed unit. Processing at Airbag24 usually takes 3–4 working days.

This order of steps is mandatory for safety reasons. Airbag24 checks the unit on the test bench, replaces defective components and carries out a function test. Then your own unit is returned to you.

If you would like the crash data deleted, please 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-AC get to Airbag24?

You send the NX7T-14B321-AC as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Put the printed repair order into the parcel and pack the unit so that it is shockproof.