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

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

At Ford, the airbag control unit AB39-14B321-CG controls the restraint system (SRS). It measures via the crash sensors what happens in an accident, decides within milliseconds whether airbags and seatbelt pretensioners are triggered, and checks the system during operation. It indicates faults with the airbag warning light.

After an accident the unit stores crash data and locks itself. Because it evaluates the signals of all sensors, it is decisive for the function of the entire system.

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

The most common cause is crash data stored after an accident on the AB39-14B321-CG, even if no airbag was triggered. Other causes are aged components, moisture at plug connections, cold solder joints and voltage spikes.

• ageing of electronic components
• corrosion and damp at plugs
• solder joints that were made cold
• voltage spikes when starting with outside help

The crash data remains stored in the unit, and an ordinary diagnostic tool cannot remove it. Airbag24 erases it during the repair.

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

The airbag warning light in the instrument cluster indicates a defect when it lights up constantly or intermittently. Fault messages in the instrument cluster, a missing connection from the diagnostic tool to the control unit, and a fault memory that cannot be cleared also point to one. In that case, airbags and seatbelt pretensioners may not deploy in an emergency.

The light is the means by which the system warns the driver, and it stays on for as long as the fault remains in the memory.

A readout of the fault memory shows in which area the system detected the fault.

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

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

The associated models are listed below:

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

First compare the part number on the label of the removed unit with this page; this confirms that it is the correct unit. In addition, have the fault memory read out, because only then will it show whether the control unit is defective or whether 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-CG work?

The repair on the AB39-14B321-CG begins with the fault memory, whose log you enclose with the order. Then disconnect the battery and remove the control unit. Create the repair order online and send in the well-packed unit. Checking, repairing and testing at Airbag24 usually take 3–4 working days.

At Airbag24 the unit is checked, defective components are replaced and stored crash data is erased. A function test follows, and your own unit is returned 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-CG get to Airbag24?

The control unit AB39-14B321-CG can be sent to Airbag24 as a parcel or via a UPS collection booked for an extra charge. After the repair it is returned by UPS.

The unit must be packed shockproof, and the printed repair order belongs inside.