Airbag control unit with part number 65.77-6938930

What does the airbag control unit 65.77-6938930 do?

The airbag control unit 65.77-6938930 is the central control unit of the restraint system (SRS) for BMW. It evaluates the signals from the crash sensors and, in an accident, decides which airbags and seatbelt pretensioners are triggered.

The unit monitors the system continuously. It shows detected faults via the airbag warning light.

After an accident, it stores crash data and locks itself. The measured values of the crash sensors converge in the control unit for this purpose.

Why does the control unit 65.77-6938930 fail?

Crash data stored after an accident is the most common cause, even if no airbag was triggered. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also possible causes.

A normal diagnostic tool cannot delete this data. Airbag24 deletes it during the repair.

Electronic components age, and solder joints can go cold. Moisture and corrosion at plug connections cause contact problems.

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

How can you tell that the 65.77-6938930 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition, an error message appears, the diagnostic tool cannot find the control unit, and the fault memory cannot be cleared.

The airbag warning light is the most important indication of a defect. If it lights up permanently or only occasionally, have the system checked promptly.

If the diagnostic tool has no connection or the fault memory cannot be cleared, a fault is present. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

Which vehicles is the 65.77-6938930 fitted in?

The airbag control unit 65.77-6938930 is fitted in these vehicles: BMW 5 Series E61 LCI Touring (2007-2010), E61 Touring (2004-2007), E60 LCI Saloon (2007-2010) and E60 Saloon (2003-2007); BMW M5 E61 Touring (2007-2010). The list below lists the vehicles individually.

The vehicles in detail:

• BMW 5 Series E61 LCI Touring (2007-2010)
• BMW M5 E61 Touring (2007-2010)
• BMW 5 Series E61 Touring (2004-2007)
• BMW 5 Series E60 LCI Saloon (2007-2010)
• BMW 5 Series E60 Saloon (2003-2007)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the right unit. Also have the fault memory read out before removal, because only this result shows whether the control unit is defective or whether a connector or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 31911421401V, 319145401011, 65 77 9 118 749 01, 65 77 911 4214-01, 65.77 9172018-01, 65.77-6946384.

How does the repair of the 65.77-6938930 work?

The processing at Airbag24 usually takes 3–4 working days. First have the fault memory read out and enclose the log. Then disconnect the battery, only then remove the control unit, and create a repair order online.

Airbag24 tests the unit on the test bench, replaces defective components, deletes stored crash data and carries out a function test.

The unit then goes back 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 65.77-6938930 get to Airbag24?

You send the unit in as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order into the parcel and pack the unit shockproof.