Airbag control unit with part number KK3T-14B321-BC

What does the airbag control unit KK3T-14B321-BC do?

The airbag control unit KK3T-14B321-BC is the central control unit of the restraint system (SRS) in Ford vehicles. It processes the signals from the crash sensors, determines within milliseconds in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

It indicates detected faults via the airbag warning light. After an accident it secures the crash data and locks itself.

Monitoring takes place without interruption for as long as the vehicle is supplied with power.

Why does the control unit KK3T-14B321-BC fail?

Stored crash data is the most common cause. It is created after an accident even if no airbag has deployed, and it cannot be erased with a normal diagnostic tool.

Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections. Voltage spikes also count, for example with a weak battery or after jump-starting.

Crash data remains in memory until Airbag24 erases it during the repair. Airbag24 checks the other causes on the test bench, because they cannot be reliably told apart from the outside.

How can you tell that the KK3T-14B321-BC is defective?

A defect shows up on the airbag warning light in the instrument cluster and through other warning signals. In that case the airbags and seatbelt pretensioners may not be able to trigger in an emergency.

• Airbag warning light in the instrument cluster lights up permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

Anyone who notices one of these signs has the fault memory read out promptly.

Which vehicles is the KK3T-14B321-BC fitted in?

The control unit KK3T-14B321-BC is fitted in these vehicles: Ford Transit 7 ’14 (from 2014).

The list contains the vehicles to which this part number is assigned.

• Ford Transit 7 ’14 (from 2014)

Compare the part number on the label of the removed unit with this page; then you know that it is the right unit. Also have the fault memory read out beforehand, because only this log 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 BK3T-14B321-AB, BK3T-14B321-AC, BK3T-14B321-AD, BK3T-14B321-BB, BK3T-14B321-BC, BK3T-14B321-BD.

How does the repair of the KK3T-14B321-BC work?

First have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit. Then create a repair order online and send the unit well packed. At Airbag24, processing usually takes 3–4 working days.

Airbag24 tests the unit on the test bench, repairs damaged components, erases the stored crash data and carries out a function test. 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 KK3T-14B321-BC get to Airbag24?

You send the control unit KK3T-14B321-BC 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 into the parcel, and pack the unit shock-proof.