Airbag control unit with part number 4M5T-14B056-AD

What does the airbag control unit 4M5T-14B056-AD do?

The airbag control unit 4M5T-14B056-AD is the central unit of the SRS, the restraint system, in Ford vehicles. It evaluates crash sensors, decides in an accident within milliseconds about airbags and seatbelt pretensioners, and reports faults via the airbag warning light.

The unit checks the system continuously. After an accident, it stores crash data and locks itself.

Why does the control unit 4M5T-14B056-AD fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Aged electronic components, cold solder joints, moisture and corrosion on plugs, and voltage spikes are also possible.

A normal diagnostic tool cannot erase this crash data, so a clearing attempt on the vehicle is not enough.

Electronics age, and plug connections react sensitively to moisture. Voltage spikes occur, for example, with a weak battery or when a jump-start is connected, and can stress components.

How can you tell that the 4M5T-14B056-AD is defective?

Signs include the airbag warning light in the instrument cluster, which lights up permanently or only intermittently, and a fault message. In addition, the diagnostic tool cannot establish a connection and the fault memory cannot be cleared.

• Airbag warning light lights up permanently
• Airbag warning light lights up intermittently
• Fault message in the instrument cluster
• No connection between diagnostic tool and control unit
• Fault memory cannot be cleared

If you see any of these signs, the airbags and seatbelt pretensioners may fail to deploy in an emergency. Please have the finding clarified promptly.

Which vehicles is the 4M5T-14B056-AD fitted in?

Your vehicle documents help with the comparison. The control unit 4M5T-14B056-AD is fitted in these vehicles: Ford Focus 2 ’04 (2004-2007) and 2 ’04 Facelift (2004-2007); Ford C-Max 1 Facelift (2007-2010) and 1 (2003-2007).

A list follows of the vehicles that Airbag24 has assigned to this part number.

• Ford Focus 2 ’04 (2004-2007)
• Ford Focus 2 ’04 Facelift (2004-2007)
• Ford C-Max 1 Facelift (2007-2010)
• Ford C-Max 1 (2003-2007)

Firstly, compare the part number on the label of the removed unit with this page. This only confirms the right unit. Secondly, have the fault memory read out beforehand. Only this result shows 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 285001552, 2M5T-14B056-BD, 2M5T-14B056-DE, 3M5T-14B056-BG, 4M5T 14B056 AE, 4M5T-14B056-BJ.

How does the repair of the 4M5T-14B056-AD work?

Have the fault memory read out and attach the log. Disconnect the battery, then remove the control unit and create a repair order online. Airbag24 checks, repairs and tests the submitted unit within 3–4 working days as a rule.

The sequence is mandatory for safety reasons. The unit belongs in shipping, packed well.

At Airbag24, the control unit is checked, defective components are replaced, stored crash data is deleted, and a function test concludes the work. Afterwards 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 4M5T-14B056-AD get to Airbag24?

Either you send the 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.

The printed repair order goes into the parcel, and you pack the unit shockproof.