Airbag control unit with part number 65.77-5A19AC1-01

What does the airbag control unit 65.77-5A19AC1-01 do?

As the restraint system (SRS) control unit of BMW, the 65.77-5A19AC1-01 carries out all processes in the event of a crash. It evaluates the signals from the crash sensors, decides within milliseconds which airbags and seatbelt pretensioners to trigger, and checks the system continuously. Reported faults appear on the airbag warning light.

The housing also shows the supplier number Continental A2C02710303. This allows the component to be described clearly without you having to open the device.

After an accident, the unit stores crash data and locks itself.

Why does the control unit 65.77-5A19AC1-01 fail?

The most common cause of the 65.77-5A19AC1-01 is stored crash data, even without a triggered airbag. Aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes also come into consideration.

Crash data is created at the moment of impact and remains in the unit. An ordinary diagnostic tool cannot delete it, so the fault remains even after driving.

The other causes develop gradually. Ageing, moisture and voltage fluctuations slowly attack the electronics.

How can you tell that the 65.77-5A19AC1-01 is defective?

A defect in the 65.77-5A19AC1-01 can be recognised by several signs. The airbag warning light in the instrument cluster lights up permanently or intermittently, an error message appears, or the diagnostic tool cannot find the control unit. In an emergency, airbags and seatbelt pretensioners may then not trigger.

These signs are:

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

The warning light is the signal you notice first in everyday driving. Note the message before you reset anything.

Which vehicles is the 65.77-5A19AC1-01 fitted in?

Our data for BMW includes this control unit. The 65.77-5A19AC1-01 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).

We list the vehicles for this part number as follows:

• 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 with this page. Also have the fault memory read out beforehand, because only the log shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 65.77-6841348-01, 6577-9474811-01, 65776841350, 65779474762, 65779474812, 9890596.

How does the repair of the 65.77-5A19AC1-01 work?

First have the fault memory read out and enclose the log. Then disconnect the battery, remove the 65.77-5A19AC1-01, create a repair order online and send the unit off well packed.

Airbag24 checks the unit on the test bench, replaces defective components, deletes stored crash data and carries out a function test. Checking, repairing and testing takes Airbag24 3–4 working days.

You then get your own unit back. 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 65.77-5A19AC1-01 get to Airbag24?

You can book a UPS collection for an extra charge; alternatively, send the 65.77-5A19AC1-01 as a parcel. Airbag24 returns it by UPS after the repair.

The printed repair order goes into the parcel, and you pack the unit shock-proof.