Airbag control unit with part number 65.77-6841348-01

What does the airbag control unit 65.77-6841348-01 do?

The airbag control unit 65.77-6841348-01 works together with the restraint system (SRS) of BMW. It reads the signals from the crash sensors, decides within a fraction of a second in an accident which airbags and seatbelt pretensioners to fire, and checks the system continuously.

If the unit detects a fault, it shows it via the airbag warning light in the instrument cluster. Because it helps decide on deployment, it must work reliably at all times.

After an accident, it stores crash data and locks itself. The manufacturer number Continental A2C85777308 is also printed on the housing.

Why does the control unit 65.77-6841348-01 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

Crash data cannot be erased with a normal diagnostic tool, so it stays in the memory. Airbag24 erases it during the repair.

Electronic components can age over the years. Moisture and corrosion affect plug connections, and voltage spikes place additional strain on the electronics.

How can you tell that the 65.77-6841348-01 is defective?

The airbag warning light stays on permanently or intermittently, and an error message appears in the instrument cluster. A defect on the 65.77-6841348-01 also shows when the diagnostic tool cannot connect to the control unit and the fault memory cannot be cleared.

In this case, the airbags and seatbelt pretensioners may not deploy in an emergency. Therefore have the cause clarified promptly rather than ignoring the light.

Which vehicles is the 65.77-6841348-01 fitted in?

The 65.77-6841348-01 is fitted in these vehicles: BMW 5 Series G31 LCI Touring (2020-2024), G31 Touring (2017-2020), G30 LCI Saloon (2020-2024) and G30 Saloon (2017-2020).

The vehicles in detail:

• BMW 5 Series G31 LCI Touring (2020-2024)
• BMW 5 Series G31 Touring (2017-2020)
• BMW 5 Series G30 LCI Saloon (2020-2024)
• BMW 5 Series G30 Saloon (2017-2020)

Compare the part number on the label of your unit with this page. This only confirms that it is the correct unit. Also have the fault memory read out beforehand, because only the result shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 6577-9474811-01, 65776841350, 65779474762, 65779474812, 9890596.

How does the repair of the 65.77-6841348-01 work?

For the 65.77-6841348-01, 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 unit well packed; processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks your unit on the test bench, replaces defective components, erases stored crash data and runs a function test. Your own 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 65.77-6841348-01 get to Airbag24?

You can send the control unit 65.77-6841348-01 in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit to you by UPS; put the printed repair order into the parcel.

Pack the unit securely against impact so that it arrives undamaged.