Airbag control unit with part number 65.77-9253636-01

What does the airbag control unit 65.77-9253636-01 do?

As the central control unit of the SRS for BMW, the airbag control unit 65.77-9253636-01 manages the restraint system in the vehicle. It processes the readings from the crash sensors and decides in a fraction of a second which airbags and seatbelt pretensioners to fire in an emergency. After an accident the unit stores crash data and locks itself.

In addition, it checks the entire system continuously. If a fault is detected, the airbag warning light in the instrument cluster shows it.

Crash data are records of the accident that are stored in the control unit.

Why does the control unit 65.77-9253636-01 fail?

Stored crash data from an earlier accident are the most common cause, even if no airbag has deployed. Other causes are aged components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

A normal diagnostic tool cannot erase these records. That explains why a failure can occur even without any visible event.

Ageing and wear of the electronics also play a role. Solder joints can stay cold, and moisture causes plug contacts to corrode, which disrupts signal transmission.

Voltage spikes, for example from a weak battery or a jump start, put additional strain on the circuit.

How can you tell that the 65.77-9253636-01 is defective?

A fault first shows up as the airbag warning light in the instrument cluster, which lights up permanently or only intermittently. In addition there may be a fault message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared.

While the light is warning, airbags and seatbelt pretensioners may not deploy in an emergency. The warning should therefore be taken seriously and not ignored.

A prompt check will establish whether the control unit itself is affected.

Which vehicles is the 65.77-9253636-01 fitted in?

The control unit 65.77-9253636-01 is fitted in these vehicles: BMW M6 F06 Gran Coupé (2013-2018); BMW M5 F10 (2011-2017); BMW 5 Series F10 Saloon (2010-2013) and F10 LCI Saloon (2013-2017).

Specifically, these are the models for which we have this number:

• BMW M6 F06 Gran Coupé (2013-2018)
• BMW M5 F10 (2011-2017)
• BMW 5 Series F10 Saloon (2010-2013)
• BMW 5 Series F10 LCI Saloon (2013-2017)

Compare the number on the label of the removed unit with this page. That way you can see whether you have the right unit in front of you, nothing more. Also have the fault memory read out, because this result shows whether the control unit is affected or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 31925363701U, 618307400E, 65 77 9 266 329, 65.77-9247024-01, 65.77-9247383-01, 6577-6807634-01.

How does the repair of the 65.77-9253636-01 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 in.

The sequence serves your safety, so keep to it. Pack the unit well after removal and enclose the log.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days, after which the 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 65.77-9253636-01 get to Airbag24?

You send the 65.77-9253636-01 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 in the parcel and pack the control unit shockproof.