Airbag control unit with part number DT1T-14B321-AG

What does the airbag control unit DT1T-14B321-AG do?

The airbag control unit DT1T-14B321-AG controls the restraint system (SRS) in the Ford. It reads the signals from the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and keeps the system under constant control. It reports detected faults to the airbag warning light.

During normal operation, the unit works unobtrusively in the background and checks sensors, cables and firing circuits.

After an accident, it stores crash data and locks itself. This data remains stored in the unit.

Why does the control unit DT1T-14B321-AG fail?

Stored crash data is the most common cause of a fault with the DT1T-14B321-AG, even if no airbag was triggered. Other causes, in brief:

• Ageing electronic components
• Cold solder joints
• Moisture and corrosion at plug connectors
• Voltage spikes from a weak battery or a jump start

Crash data cannot be erased with an ordinary diagnostic tool. Airbag24 removes it during the repair.

How can you tell that the DT1T-14B321-AG is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears, and the diagnostic tool cannot reach the control unit. The fault memory cannot be cleared in this case. Airbags and seatbelt pretensioners may then fail to trigger in an emergency.

Watch the warning light, ideally at every start, as it is the clearest sign. If it does not go out, a check is the next step.

A fault message in the instrument cluster is a further sign. Only the readout will show whether the defect lies in the control unit or in its surroundings.

Which vehicles is the DT1T-14B321-AG fitted in?

The control unit DT1T-14B321-AG is fitted in these vehicles: Ford Transit 7 ’14 (from 2014).

The list shows the vehicles to which Airbag24 assigns this control unit.

• Ford Transit 7 ’14 (from 2014)

Compare the part number on the label of the removed unit with this page; this confirms that it is the right unit. Whether the control unit is defective or a plug or cable is the cause is shown only by the fault memory read out beforehand.

For the same vehicles, we also repair control units with the part numbers BK2T-14B321-BF, BK3T-14B321-AC, DT1T-14B321-DF, KT1T-14B321-KD, LK4Z-14B321-C, LK4Z-14B321-E.

How does the repair of the DT1T-14B321-AG work?

First, have the fault memory read out and attach the log. Then disconnect the battery, remove the control unit and create a repair order online. Only then send the DT1T-14B321-AG in, well packed.

Airbag24 tests the unit on the test bench, replaces defective components, deletes stored crash data and carries out a function test. Afterwards, your own unit goes back to you.

Testing, repairing and function-testing at Airbag24 usually take 3–4 working days.

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 DT1T-14B321-AG get to Airbag24?

You send the DT1T-14B321-AG in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Include the printed repair order and pack the control unit shockproof.