Airbag control unit with part number 65.77-5A19AC3-01

What does the airbag control unit 65.77-5A19AC3-01 do?

The airbag control unit 65.77-5A19AC3-01 controls the restraint system (SRS) of BMW. It evaluates the sensor signals, decides within milliseconds in an accident whether airbags and seatbelt pretensioners are triggered, and continuously monitors the system.

Faults are indicated by the unit via the airbag warning light. The housing additionally bears the manufacturer number Continental A2C16862605.

After an accident, the control unit stores crash data and locks itself. It thus also serves as a data store for the accident event.

Why does the control unit 65.77-5A19AC3-01 fail?

The most common cause is stored crash data after an accident, even if no airbag has been triggered. Other factors include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

A normal diagnostic tool cannot erase the crash data. Airbag24 erases it during the repair, so that it is no longer stored in the unit afterwards.

Voltage spikes arise, for example, from a weak battery or from jump-starting. The other causes cannot be reliably identified from outside; they only show up during testing.

How can you tell that the 65.77-5A19AC3-01 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently. In addition, an error message appears in the instrument cluster, the diagnostic tool gets no connection to the control unit, or the fault memory cannot be cleared.

As long as the warning light indicates a fault, the airbags and seatbelt pretensioners may not trigger in an emergency. Please have a permanent or recurring warning checked promptly.

Which vehicles is the 65.77-5A19AC3-01 fitted in?

The control unit 65.77-5A19AC3-01 is fitted in these vehicles: BMW 1 Series F40 (2019-2024).

These models are recorded with this part number:

• BMW 1 Series F40 (2019-2024)

You make the label comparison on the removed unit; it only shows that you have the correct unit in front of you. Whether the control unit is defective or a plug or cable is the cause is shown by the fault memory read out, so have it read out beforehand.

For the same vehicles, we also repair control units with the part numbers 65779873895, 9873895, A2C16862603.

How does the repair of the 65.77-5A19AC3-01 work?

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

Airbag24 tests the unit on the test bench, eliminates the faults in the defective components, erases stored crash data and carries out a function test. The unit then returns 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 65.77-5A19AC3-01 get to Airbag24?

Either you send the unit yourself as a parcel, or you book a UPS collection for an extra charge. The return after the repair is made by UPS from Airbag24.

Attach the printed repair order to the parcel and pack the unit securely against shocks.