Airbag control unit with part number CN15-14B321-AD

What does the airbag control unit CN15-14B321-AD do?

The airbag control unit CN15-14B321-AD coordinates the restraint system (SRS) in Ford. It reads the signals from the crash sensors, determines in an accident within a fraction of a second which airbags and seatbelt pretensioners fire, and monitors the entire system.

The unit continuously checks whether the sensors, output stages and wiring are in order. If it finds a fault, it stores it and shows it via the airbag warning light in the instrument cluster.

After an accident, the control unit stores crash data and locks itself. For diagnosis, this entry is therefore an important clue.

Why does the control unit CN15-14B321-AD fail?

Most often, the CN15-14B321-AD fails because of crash data stored after an accident, even if no airbag was triggered. Further triggers are aged components, moisture on the plug connections, corrosion and voltage spikes in the vehicle electrical system.

The further causes in detail:

• aged electronic components
• cold solder joints on the circuit boards
• moisture and corrosion on plug connections
• voltage spikes, for example from a weak battery or when starting with a jump start

Crash data cannot be deleted with a normal diagnostic tool, so such an entry does not disappear on its own. Only the log of the fault memory shows whether it is the cause in your case.

How can you tell that the CN15-14B321-AD is defective?

The airbag warning light in the instrument cluster lights up on the CN15-14B321-AD continuously or intermittently. In addition there is an error message in the instrument cluster, a diagnostic tool without connection to the control unit, and a fault memory that cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may not be able to trigger in the event of such a defect. The warning light is therefore to be taken seriously, and the cause should be clarified promptly.

Whether the control unit itself is affected or a cable is behind it only becomes apparent when the fault memory is read out. Until then, the display remains a warning signal whose source is unknown.

Which vehicles is the CN15-14B321-AD fitted in?

The CN15-14B321-AD is fitted in these vehicles: Ford EcoSport 2 (2012-2015).

The following list shows which models are included.

• Ford EcoSport 2 (2012-2015)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the right unit. Whether it is really defective is shown only by the fault memory read-out, which you should have carried out beforehand.

For the same vehicles, we also repair control units with the part numbers DN1T-14B321-EC, GN15-14B321-AF, GN15-14B321-GJ, GN1Z-14B321-AE, GN1Z-14B321-AK.

How does the repair of the CN15-14B321-AD work?

The process begins with reading out the fault memory, and you enclose the log. Only then do you disconnect the battery and remove the control unit CN15-14B321-AD; afterwards you create the repair order online and send in the packed unit.

On the test bench, Airbag24 examines the unit, repairs defective components, deletes the crash data and carries out a function test. Then the unit goes back to you.

Processing at Airbag24 usually takes 3–4 working days. This refers solely to the time for checking, repairing and testing; removal, sending in and shipping are not included.

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 CN15-14B321-AD get to Airbag24?

Either you send the control unit CN15-14B321-AD in as a parcel, or you book a UPS collection for an extra charge. After repair, UPS brings the unit back to you.

Pack the unit shockproof and enclose the printed repair order with the parcel.