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

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

The airbag control unit J7BT-14B321-HB controls the entire restraint system in vehicles from Ford. It receives the signals from the crash sensors, decides within milliseconds in a crash which airbags and seatbelt pretensioners trigger, and monitors the system continuously. It reports any faults found to the airbag warning light.

In the background the unit checks whether supply and connections are in order. If it finds no irregularities, you notice nothing of it in everyday life.

If an accident occurs, the unit stores crash data and then locks itself.

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

Stored crash data is the most common cause once the vehicle has had an accident, even if no airbag triggered. An ordinary diagnostic tool cannot erase it. Also possible are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting. Airbag24 erases the crash data during repair.

The unit keeps the entry until a repair removes it.

The other causes develop gradually. Electronics age, solder joints can become brittle, and moisture changes contacts over time.

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

The airbag warning light in the instrument cluster, which lights up permanently or intermittently, and a fault message in the instrument cluster indicate a defect. Likewise, if the diagnostic tool cannot establish a connection to the control unit or the fault memory cannot be cleared, that points the same way. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The warning light is the place where the system shows you the condition directly. Whether the control unit or a cable is behind it can only be shown by the read-out.

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

The control unit J7BT-14B321-HB is fitted in these vehicles: Ford Ka+ 3 (2016-2018) and 3 Facelift (2018-2021).

This list names the vehicles for which the number is recorded.

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

Comparing the part number on the label of the removed unit with this page only ensures that you have the right unit. Have the fault memory read out beforehand, because it is the step before that which shows whether the control unit is defective or a plug or cable is the cause.

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

You begin with the fault memory: have it read out and attach the log. Then disconnect the battery, remove the control unit and create a repair order online before you send the unit off well packed. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit goes onto the test bench. Afterwards defective components are replaced, the stored crash data is erased and a function test is run. Then 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 J7BT-14B321-HB get to Airbag24?

You send the unit as a parcel or book UPS collection for an extra charge. The return after repair is also made by UPS.

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