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

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

The airbag control unit AB39-14B321-BG is the central point of the restraint system (SRS) for Ford for evaluation and triggering. It receives the signals from the crash sensors, decides within milliseconds in an accident on airbags and seatbelt pretensioners, and monitors the system permanently. After an accident it stores crash data and locks itself.

Every detected fault in the system appears via the airbag warning light in the instrument cluster. The device is therefore also the source of the warning messages you see on the dashboard.

Without the evaluation in the control unit, the restraint system cannot work as intended. A defect therefore has major consequences.

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

Crash data stored after an accident is the most common cause, even if no airbag has deployed. Aged electronic components, cold solder joints, moisture and corrosion at connectors and voltage spikes are also possible.

A standard diagnostic tool does not erase this crash data. Airbag24 deletes it as part of the repair.

Aged components and cold solder joints can cause faults over time. Moisture and corrosion at connectors impair the contact.

Voltage spikes, for example from a weak battery or a jump start, put additional strain on the electronics.

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

The airbag warning light in the instrument cluster lights up permanently or intermittently, a sign of a defect. A fault message in the instrument cluster and a diagnostic tool without connection to the control unit also appear.

A fault memory that you cannot clear also counts among these findings. It shows that the control unit has detected a fault whose cause must be clarified.

In an emergency, airbags and seatbelt pretensioners may not deploy in the event of a defect. The warning light makes the finding visible, so it is worth taking it seriously immediately.

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

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

Below are the vehicles that are assigned to this number.

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

Matching the part number on the label of the removed unit shows that you have the correct unit in front of you. Whether the device is defective or whether a connector or cable is causing the fault is clarified only by the fault memory, which you have read out in advance.

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-BG work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Processing at Airbag24 usually takes 3–4 working days.

Create the repair order online and send in the device well packed.

Airbag24 tests the device on the test bench, replaces defective components, deletes the stored crash data and carries out a function test. Your own unit then 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 AB39-14B321-BG get to Airbag24?

You send the device as a parcel or book a UPS collection for an extra charge. Airbag24 returns your repaired device by UPS on the return journey.

Print out the repair order and put it in the parcel. Pack the control unit shock-proof so that it arrives safely.