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

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

The airbag control unit J7BT-14B321-KA coordinates the restraint system (SRS) in Ford. It reads the crash sensors, calculates within milliseconds in a collision which airbags and seatbelt pretensioners to trigger, and monitors the system permanently. Detected faults are passed on to the airbag warning light.

While driving, the unit continuously checks wiring, sensors and output stages. A deviation is recorded in the fault memory so that it can be found later in a targeted way.

After an accident, the unit stores crash data and locks itself. This lock is only lifted by the repair.

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

The most common cause is crash data created after an accident, even if no airbag was triggered. A normal diagnostic tool cannot delete this data. Other causes include ageing, moisture and voltage spikes.

Crash data remains stored in the control unit as soon as the impact has been registered. The fact that no airbag fired therefore does not mean that nothing was recorded.

Other causes may also come into play:

• aged electronic components
• cold solder joints inside the unit
• moisture and corrosion on plug connections
• voltage spikes, for example from a weak battery or a jump start

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

The airbag warning light in the instrument cluster lights up permanently or intermittently. An error message also appears in the instrument cluster, and the diagnostic tool cannot establish a connection to the control unit. Furthermore, the fault memory cannot be cleared.

In the event of a defect, airbags and seatbelt pretensioners may not trigger in an emergency. Please have the warning checked promptly, even if the vehicle otherwise drives normally.

The warning light indicates that the system has detected the fault itself. A defect therefore does not go unnoticed.

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

The J7BT-14B321-KA is fitted in these vehicles for Ford: Ford Ka+ 3 (2016-2018) and 3 Facelift (2018-2021). The vehicles are listed below.

The overview follows here:

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

Compare the part number on the label of the removed unit with this page. This only ensures that you have the right unit in front of you. Have the fault memory read out beforehand: only this result shows whether the control unit itself is defective or whether a connector or a cable is the cause.

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

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

Airbag24 examines the unit on the test bench, replaces defective components, deletes stored crash data and carries out a function test. Your own unit is then returned to you. Processing at Airbag24 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-KA get to Airbag24?

You send the control unit in as a parcel, or book a UPS collection for an extra charge. After the repair, UPS brings the unit back to you.

The printed repair order goes into the parcel. Pack the unit so that it is shock-resistant and survives transport undamaged.