Airbag control unit with part number AB39-14B321-AD

What does the airbag control unit AB39-14B321-AD do?

In the vehicle, the airbag control unit AB39-14B321-AD takes over control of the restraint system. In Ford it evaluates the crash sensors, decides on firing the airbags and seatbelt pretensioners, and keeps the system under constant monitoring. After an accident it secures crash data and locks itself.

If a fault is detected, the airbag warning light in the instrument cluster comes on.

Why does the control unit AB39-14B321-AD fail?

Stored crash data is the most common cause with the AB39-14B321-AD, even if no airbag has deployed. Standard diagnostic tools cannot erase it, but Airbag24 erases it during the repair.

Other reasons are aged electronics, cold solder joints and corrosion at plug connections, but also moisture and voltage spikes, for example from a weak battery.

How can you tell that the AB39-14B321-AD is defective?

A defect in the AB39-14B321-AD can be recognised by several signs: the airbag warning light stays on continuously or intermittently, the instrument cluster shows an error message, the diagnostic tool cannot reach the control unit, or the fault memory remains. In an emergency, the airbags and seatbelt pretensioners may then not deploy.

The warning light is therefore an immediate warning sign, and you should have it checked promptly.

Which vehicles is the AB39-14B321-AD fitted in?

The control unit AB39-14B321-AD is fitted in these vehicles: Ford Ranger 3 (2011-2015), 3 1st Facelift (2016-2019) and 3 2nd Facelift (2019-2023).

The list below shows the vehicles assigned to this part number.

• Ford Ranger 3 (2011-2015)
• Ford Ranger 3 1st Facelift (2016-2019)
• Ford Ranger 3 2nd Facelift (2019-2023)

Comparing the part number on the label with this page only clarifies whether it is the right unit. For that, have the fault memory read out beforehand, because only this log shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers AB3914B321CF, KB3T-14B321-BD.

How does the repair of the AB39-14B321-AD work?

At Airbag24, the AB39-14B321-AD is usually checked, repaired and tested within 3–4 working days. This period covers only the work at Airbag24.

On your side, you read out the fault memory, attach the log and disconnect the battery before the control unit is removed. Then you create a repair order online and pack the unit carefully.

On the test bench, Airbag24 inspects the assembly, repairs defective components, erases the crash data and carries out a function test. 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 AB39-14B321-AD get to Airbag24?

You send the AB39-14B321-AD as a parcel to Airbag24, or you book a UPS collection for an extra charge. The return shipment is made by UPS.

A shock-proof carton and the enclosed repair order belong in the parcel.