Airbag control unit with part number BL84-14B321-AA

What does the airbag control unit BL84-14B321-AA do?

The airbag control unit BL84-14B321-AA coordinates the restraint system (SRS) of Ford. It processes the signals from the crash sensors, determines within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and checks the system constantly.

Faults are indicated via the airbag warning light in the instrument cluster. At the same time, they are recorded in the fault memory.

After an accident, the control unit stores crash data and locks itself. The lock is only lifted by the repair.

Why does the control unit BL84-14B321-AA fail?

Most often the cause lies in crash data stored after an accident, even without a deployed airbag. A normal diagnostic tool cannot erase this data. Further causes in brief: ageing of the electronics, moisture, voltage spikes and cold solder joints.

• ageing electronic components
• cold solder joints
• moisture and corrosion on plug connectors
• voltage spikes, for example from a weak battery or jump-starting

Airbag24 erases the crash data during the repair. Which of the other causes applies is shown by the inspection of the unit.

How can you tell that the BL84-14B321-AA is defective?

You recognise a fault by the airbag warning light in the instrument cluster that stays on permanently or intermittently, by a message in the instrument cluster, by a diagnostic tool without connection to the control unit, and by a fault memory that cannot be cleared.

In such a fault, airbags and seatbelt pretensioners may possibly fail to deploy in an emergency. Have the warning clarified promptly rather than ignoring it.

Which vehicles is the BL84-14B321-AA fitted in?

The airbag control unit BL84-14B321-AA is fitted in these vehicles: Ford Escape 2 (2008-2012).

The following list shows the models assigned to this page.

• Ford Escape 2 (2008-2012)

Compare the part number on the label of the removed unit with this page. This only shows that it is the correct unit. Also have the fault memory read out beforehand, since 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 8L84-14B321-AG, 8L84-14B321-AH, 8L84-14B321-AJ, 8L84-14B321-AK, 9L84-14B321-AJ, 9L84-14B321-AK.

How does the repair of the BL84-14B321-AA work?

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

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. The unit is then 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 BL84-14B321-AA get to Airbag24?

You send the unit to Airbag24 as a parcel or book a UPS collection for an extra charge. Airbag24 returns the unit by UPS after the repair.

Place the printed repair order in the parcel and pack the unit shockproof.