Airbag control unit with part number MK72-14D374-AF

What does the airbag control unit MK72-14D374-AF do?

The airbag control unit MK72-14D374-AF is the central control unit of the restraint system (SRS) for Land Rover. It analyses the signals from the crash sensors and, in the event of an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered. It monitors the system continuously and reports faults via the airbag warning light.

After an accident, the unit stores crash data and locks itself.

While driving, the control unit checks the entire restraint system, which includes the sensors, airbags and seatbelt pretensioners. Any fault detected is shown in the instrument cluster.

Why does the control unit MK72-14D374-AF fail?

For the control unit MK72-14D374-AF, the most common cause is that crash data was stored after an accident, even if no airbag was triggered. Other causes include aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes. On this control unit, erasing the crash data is often not possible; if you would like the data erased, contact Airbag24 briefly before sending the unit in, and Airbag24 will check the part number.

A normal diagnostic tool cannot erase the crash data. Which cause applies in each case only becomes clear once the unit has been checked.

Aged components and cold solder joints can also lead to a failure. Moisture and corrosion at plug connections can disrupt the contact, and voltage spikes, for example from a weak battery or a jump start, also belong to this group.

How can you tell that the MK72-14D374-AF is defective?

A fault in the control unit MK72-14D374-AF shows up when the airbag warning light in the instrument cluster lights up permanently or intermittently, and as a fault message in the instrument cluster. The diagnostic tool then cannot connect to the control unit, and the fault memory cannot be erased.

• airbag warning light in the instrument cluster lights up permanently or intermittently
• fault message in the instrument cluster
• the diagnostic tool cannot connect to the control unit
• the fault memory cannot be erased

In an emergency, the airbags and seatbelt pretensioners may then fail to deploy. If the warning light is on, have the fault checked promptly.

Which vehicles is the MK72-14D374-AF fitted in?

The airbag control unit MK72-14D374-AF belongs to Land Rover. It is fitted in these vehicles: Land Rover Discovery 4 (2009-2013) and 4 Facelift (2013-2017).

In detail, it applies to the following vehicles:

• Land Rover Discovery 4 (2009-2013)
• Land Rover Discovery 4 Facelift (2013-2017)

Compare the part number on the label of the removed unit with this page; this simply confirms that you have the correct unit in front of you. Also have the fault memory read out beforehand, as only that shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers AH22-14D374-AG, FH22 14D374 AC, FK72-14D374-AF, FK72-14D374-AH, HY3214D374AA, LR018452.

How does the repair of the MK72-14D374-AF work?

For the control unit MK72-14D374-AF, first have the fault memory read out, then disconnect the battery and only then remove the control unit. Next, create a repair order online and send the unit in, well packed. Processing at Airbag24 usually takes 3–4 working days.

Enclose the fault memory log with the unit; the sequence is mandatory for safety reasons. If you would like the crash data erased, contact Airbag24 briefly before sending the unit in.

Airbag24 checks the unit on the test bench, replaces defective components and carries out a functional test. You then receive your own, repaired 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 MK72-14D374-AF get to Airbag24?

You send the control unit MK72-14D374-AF in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order in the parcel and pack the unit securely against impact.