Airbag control unit with part number M9V2-14D374-AA

What does the airbag control unit M9V2-14D374-AA do?

The control unit M9V2-14D374-AA coordinates the restraint system (SRS) of Land Rover. It evaluates the crash sensors, determines within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

Detected faults are made visible via the airbag warning light.

Why does the control unit M9V2-14D374-AA fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. With this control unit, erasing the crash data is often not possible; anyone who wants it erased should contact Airbag24 briefly before sending the unit, and Airbag24 will then check the part number. Other causes are aged electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

• aged control electronics
• solder joints with poor contact
• corrosion and moisture in the plug
• voltage spikes in the vehicle electrical system, for example from a weak battery or a jump start

Whether any of these causes applies is shown only by testing on the test bench.

How can you tell that the M9V2-14D374-AA is defective?

The airbag warning light in the instrument cluster stays on permanently or only intermittently. A fault message may also appear in the instrument cluster, and the diagnostic tool then finds no connection to the control unit. In an emergency, airbags and seatbelt pretensioners may fail to deploy.

These signs belong together and point jointly to a fault in the system.

Which vehicles is the M9V2-14D374-AA fitted in?

The M9V2-14D374-AA is used in the following vehicles: Land Rover Discovery 5 Facelift (from 2021) and 5 (2017-2020).

These vehicles are listed below:

• Land Rover Discovery 5 Facelift (from 2021)
• Land Rover Discovery 5 (2017-2020)

Matching the label number only shows that it is the correct unit. Have the fault memory read out beforehand, because only this log shows whether the control unit is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers K8D2-14D374-AB, L8B2-14D374-AB, LR081400, M8E2-14D374-AC, M8E2-14D374-AD, M9V2-14D374-AB.

How does the repair of the M9V2-14D374-AA work?

First have the fault memory read out; attach the log. Then disconnect the battery and only then remove the control unit. Testing, repair and the function test at Airbag24 usually take 3–4 working days.

After removal, create the repair order online and send the unit in well packed. Airbag24 tests it on the test bench, replaces defective components and carries out a function test. Afterwards your own unit goes back to you.

If you would like the crash data erased, contact Airbag24 briefly before sending the unit.

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 M9V2-14D374-AA get to Airbag24?

The control unit goes to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, UPS brings the unit back to you.

The printed repair order is in the parcel; the unit is packed so that it can withstand knocks.