Airbag control unit with part number DM5T-14B321-HE

What does the airbag control unit DM5T-14B321-HE do?

The airbag control unit DM5T-14B321-HE is responsible for the restraint system (SRS) of Ford. It processes the signals from the crash sensors, determines the triggering of airbags and seatbelt pretensioners within milliseconds in a crash, and monitors the system continuously. It shows detected faults via the airbag warning light.

The system is under observation throughout operation. The unit compares measured values with target values and records deviations in the fault memory.

After a crash the control unit stores crash data and locks itself. The lock is only lifted by the repair.

Why does the control unit DM5T-14B321-HE fail?

The most common cause is the crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other causes are aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data remains in the memory of the unit after the accident. The other causes include ageing of components and moisture at plugs; voltage spikes arise, for example, with a weak battery or a jump start.

Airbag24 erases the crash data during the repair. The other causes are identified in the course of the test.

How can you tell that the DM5T-14B321-HE is defective?

A defect shows itself when the airbag warning light in the instrument cluster stays on permanently or intermittently, an error message appears, the diagnostic tool cannot establish a connection, or the fault memory cannot be cleared. In this case airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light therefore indicates the fault directly. The instrument cluster also outputs a text message when the finding is present. Have such an indication checked promptly.

Which vehicles is the DM5T-14B321-HE fitted in?

The airbag control unit DM5T-14B321-HE is fitted in these vehicles: Ford Focus 3 ’11 (2010-2014) and 3 ’11 Facelift (2014-2018).

You will find the vehicles in the following list.

• Ford Focus 3 ’11 (2010-2014)
• Ford Focus 3 ’11 Facelift (2014-2018)

Comparing the part number on the label of the removed unit with this page only confirms that you have the right unit. Have the fault memory read out beforehand: only then does it become clear whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 285011993, BM5T-14B321-BD, BM5T-14B321-BE, BM5T-14B321-BF, BM5T-14B321-BG, BM5T-14B321-CD.

How does the repair of the DM5T-14B321-HE work?

First have the fault memory read out and enclose the log with the unit, then disconnect the battery before you remove the control unit, and create a repair order online. Processing at Airbag24 usually takes 3–4 working days.

Then pack the unit well and send it in. The sequence protects you during removal and must therefore be observed.

At Airbag24 the control unit is first examined on the test bench; the workshop then repairs defective components and carries out a function test. Airbag24 erases the crash data in the process. Afterwards you get the unit back.

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 DM5T-14B321-HE get to Airbag24?

You send the DM5T-14B321-HE as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

Put the printed repair order into the parcel and pack the control unit shock-proof so it survives shipping undamaged.