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

What is the function of the Airbag Control Unit DM5T-14B321-EH?

The airbag control unit with part number DM5T-14B321-EH is the central control module for the occupant protection system in various Ford C-Max models. As a Ford OEM component, often equivalent to a Bosch part such as 0285001452, it processes data from crash sensors and, in the event of an accident, deploys airbags and pretensioners to protect occupants.

This component serves as the brain of the entire passive safety system. It continuously monitors all connected sensors—such as acceleration and pressure sensors—as well as the ignition circuits of pyrotechnic components (airbags, seatbelt pretensioners). Only when sensor data clearly indicates a collision does the control unit issue the deployment command.

The control unit is specifically calibrated for each vehicle model to ensure flawless operation. Various versions and related part numbers exist, including DM5T-14B321-SA, DM5T14B321RA, AM5T14B321AG, or 4M5T-14B056-AE, which may be used across the same vehicle platforms.

Why does the DM5T-14B321-EH control unit fail? Common defects.

The most frequent cause of failure for the DM5T-14B321-EH control unit is the storage of crash data after an accident, which triggers an internal lockout. Other causes include internal software errors that block communication or hardware faults on the circuit board. In these cases, the unit no longer responds to diagnostic requests.

Following an accident in which airbags or seatbelt pretensioners have deployed, the control unit stores so‑called crash data. This data is permanent and cannot be erased using standard workshop scanners. For safety reasons, the unit becomes locked and must be professionally reset.

Another common defect is complete loss of communication via the OBD2 interface. The control unit stops responding to diagnostic equipment. Possible causes include internal software malfunctions leading to a blockage or repairable hardware failures on the circuit board.

How can you recognize a fault in the DM5T-14B321-EH airbag control unit?

A malfunction of the DM5T-14B321-EH control unit primarily manifests as a permanently illuminated or flashing airbag warning light on the instrument cluster. Another clear indication is when a specialized workshop cannot establish communication with the control unit using a diagnostic tool, making it impossible to read the fault memory.

The most obvious symptom is the active airbag warning light, signaling to the driver that the passive safety system is either non‑functional or only partially operational. During a mandatory technical inspection, this condition results in failure.

If the control unit is internally blocked or defective, it often refuses all communication. A workshop then cannot retrieve any error codes, complicating diagnosis. Externally, the unit appears completely inoperative.

It is advisable to have a specialist workshop check before removing the control unit whether the issue lies with external components such as wiring harnesses, connectors, or the crash sensors themselves. A diagnostic report helps pinpoint the exact source of the problem.

In which vehicles is the DM5T-14B321-EH control unit installed?

The Ford airbag control unit DM5T-14B321-EH is mainly used in the Ford C‑Max and Grand C‑Max series across two generations. At Airbag24, this control unit—and compatible variants—for all specified model years are professionally refurbished to restore full safety.

At Airbag24, we repair part number DM5T-14B321-EH and related variants for the following Ford models:

Ford C‑Max 1st generation (model years 2003–2007) and facelift (2007–2010)

Ford C‑Max 2nd generation (model years 2010–2015) and facelift (2015–2019)

Ford Grand C‑Max 2nd generation (model years 2010–2015) and facelift (2015–2019)

How is the DM5T-14B321-EH professionally repaired at Airbag24?

At Airbag24, the DM5T-14B321-EH control unit is restored to like-new condition through a specialized electronic process. Upon receipt, our technicians erase stored crash data, install new software if needed, and thoroughly inspect the hardware. Following a final test, the unit is fully functional again, backed by 2 years’ statutory liability for defects.

The repair process at Airbag24 follows proven steps. First, have the faulty control unit removed by a qualified workshop. Then, ship it securely packaged—ideally along with a repair form and a diagnostic report—to us.

Upon receiving the unit, a comprehensive analysis takes place. Our technicians use specialized software to completely erase stored crash data and reset the fault memory. If necessary, the device’s software is entirely reinstalled to restore all functions.

Subsequently, the repaired control unit undergoes rigorous testing on a test bench to ensure it functions like a brand-new part. Upon successful testing, it is returned to you and can be reinstalled in your vehicle. We provide 2 years' statutory liability for defects on every repair.