Airbag control unit with part number DS7T-14B321-CF

What does the airbag control unit DS7T-14B321-CF do?

At Ford, the airbag control unit DS7T-14B321-CF is the switching point for all restraint devices. It evaluates the impact sensors, selects the airbags and seatbelt pretensioners to be triggered in a crash, and monitors the condition of the system. It shows fault states via the airbag warning light.

After an accident the unit writes crash data and then locks itself. A repair is the only way to lift this lock.

At first glance the control unit looks inconspicuous, because it works without any operation by the driver.

Why does the control unit DS7T-14B321-CF fail?

Crash data is the most common cause: it is created after an accident even if no airbag was triggered, and a normal diagnostic tool cannot erase it. Aged electronic components, cold solder joints, moisture or corrosion at plug connectors and voltage spikes can also cause the failure.

Crash data remains stored in the unit until the repair removes it. Reading it out alone therefore does not solve the problem.

The other triggers develop more slowly: ageing, corrosion and moisture worsen the contacts, while voltage spikes from a weak battery or from connecting a jump start act suddenly.

How can you tell that the DS7T-14B321-CF is defective?

The airbag warning light may stay on permanently or only intermittently. In addition there may be error messages in the instrument cluster, a diagnostic tool without a connection to the control unit, or a fault memory that you cannot reset. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The light in the instrument cluster is the clearest signal that the system has stored a fault.

If the message comes back after every start, it is not a one-off disturbance, and the cause must be clarified.

Which vehicles is the DS7T-14B321-CF fitted in?

The DS7T-14B321-CF is fitted in these vehicles: Ford Mondeo 5 ’13 (2014-2019) and 5 ’13 Facelift (2019-2022).

The assignment stored for this control unit with us is listed here:

• Ford Mondeo 5 ’13 (2014-2019)
• Ford Mondeo 5 ’13 Facelift (2019-2022)

Use the part number on the label of the removed unit to check whether it matches this page. That does not yet say anything about the cause. A fault memory read out beforehand shows whether the control unit is affected or whether a plug or cable is causing the disturbance.

For the same vehicles, we also repair control units with the part numbers 1S7T-14B056, 1S7T-14B056-BG, 2184427, 285010733, DS7T-14B321-BB.

How does the repair of the DS7T-14B321-CF work?

First have the fault memory read out and enclose the log. Then disconnect the battery and remove the control unit before you create a repair order online. Afterwards pack the unit and send it in; Airbag24 generally needs 3–4 working days for inspection, repair and test.

Airbag24 then takes over the inspection on the test bench, replaces defective components, erases the crash data and tests the function. Your control 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 DS7T-14B321-CF get to Airbag24?

You send the control unit as a parcel, or you book a UPS collection for an extra charge. After the repair Airbag24 sends it back to you by UPS.

Pack the control unit shock-proof and put the printed repair order into the parcel.