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

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

At Ford, the airbag control unit J7BT-14B321-JA evaluates the crash sensors and forms the restraint system (SRS). In a crash, it decides within milliseconds on the triggering of airbags and seatbelt pretensioners and monitors the system continuously. After a crash, it stores crash data and locks itself.

The unit displays faults in the system via the airbag warning light in the instrument cluster. The control unit is therefore the point where all messages of the system converge.

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

The most common reason for a failure of the control unit J7BT-14B321-JA is crash data stored after an accident, even if no airbag has deployed. An ordinary diagnostic tool cannot erase this data. Further causes are aged components, cold solder joints, moisture and corrosion on plugs, and voltage spikes from weak batteries or a jump start.

Stored crash data is the entry that the unit creates after an accident. It remains in the memory even if the vehicle then drives normally again.

The other causes act over a longer period: components age, corrosion attacks connections through moisture, and voltage fluctuations strain the electronics.

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

You recognise a defect on the control unit J7BT-14B321-JA mainly by the airbag warning light, which stays on permanently or intermittently. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

Other signs include:

• A fault message in the instrument cluster
• The diagnostic tool has no connection to the control unit
• The fault memory cannot be reset

If you notice these signs, have the fault memory read out. Take the warning seriously even when the vehicle runs inconspicuously in everyday use.

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

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

The overview below lists the vehicles assigned to this part number.

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

Comparing the part number on the label with this page only ensures that you have removed the correct unit. Have the fault memory read out beforehand; only the log shows whether the control unit is defective or whether a plug or cable is the cause.

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

First have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit. Afterwards, create a repair order online and send the unit in well packed.

At Airbag24, the unit first goes through the test bench. Then defective components are replaced, crash data is deleted and a function test is carried out before your own unit is returned.

You can expect 3–4 working days as a rule for processing at Airbag24.

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-JA get to Airbag24?

You choose the shipping method yourself: either you send the control unit J7BT-14B321-JA as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

The printed repair order goes into the parcel, and the unit is packed shock-resistant.