Airbag control unit with part number J7BT-14B321-EB

What does the airbag control unit J7BT-14B321-EB do?

In the restraint system (SRS) of Ford, the airbag control unit J7BT-14B321-EB takes the central role. It reads out the crash sensors and, in the event of an accident, decides within milliseconds which airbags and seatbelt pretensioners fire. After an accident it stores crash data and locks itself.

In operation, monitoring runs in the background. If a fault occurs, the unit reports it via the airbag warning light in the instrument cluster.

The unit is designed so that the triggering decision is made before the impact. Sensors, computing logic and output stages work together for this.

Why does the control unit J7BT-14B321-EB fail?

Most often, crash data stored after an accident leads to failure, even without a deployed airbag; an ordinary diagnostic tool does not erase it. Other possible causes are aged components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

After an accident the crash data remains in memory, and as long as it is there the fault state persists, even if the vehicle appears to run normally. The other triggers are ageing of the electronics, cold solder joints, moisture or corrosion at plugs, and voltage spikes caused by weak batteries or jump starts.

Which cause applies in an individual case can only be established by examining the unit.

How can you tell that the J7BT-14B321-EB is defective?

A defect can be recognised by an airbag warning light that is permanently or intermittently lit, as well as by a fault message or a fault memory that cannot be cleared. In a real emergency, the airbags and seatbelt pretensioners may then fail to deploy.

These signs point to a defect:

• Airbag warning light in the instrument cluster, permanently or intermittently on
• Fault message in the instrument cluster
• Diagnostic tool unable to reach the control unit
• Fault memory that cannot be emptied

Have such signs checked before you continue to use the vehicle on the road.

Which vehicles is the J7BT-14B321-EB fitted in?

Check the fitment list before removal. The control unit J7BT-14B321-EB is fitted in these Ford vehicles: Ford Ka+ 3 (2016-2018) and 3 Facelift (2018-2021).

The following list shows the models:

• Ford Ka+ 3 (2016-2018)
• Ford Ka+ 3 Facelift (2018-2021)

This page only lets you check whether the label on the removed unit bears the same number. The cause is determined solely by the fault memory, which you should have read out beforehand.

How does the repair of the J7BT-14B321-EB work?

It starts with reading out the fault memory; the log accompanies the unit. Only then disconnect the battery and remove the control unit. The repair order is created online before the well-packed unit is sent to Airbag24.

At Airbag24 the unit is checked on the test bench, defective components are repaired, stored crash data is erased, and a function test follows. Only then is your own unit sent back.

Processing usually takes 3–4 working days. 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 J7BT-14B321-EB get to Airbag24?

Either you send the unit as a parcel, or you book a UPS collection. The return after repair is handled by UPS.

Enclose the printed repair order and pad the control unit so that it arrives shockproof.