Airbag control unit with part number 6577 9134734-01

What does the airbag control unit 6577 9134734-01 do?

For BMW, the SRS control unit 6577 9134734-01 is the central unit of the restraint system. It analyses the signals from the crash sensors, decides within milliseconds in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It indicates detected faults via the airbag warning light.

The unit works constantly in the background. It monitors sensors, cable connections and output stages and records deviations in the fault memory.

After an accident the unit stores crash data and locks itself. Only the repair lifts this lock.

Why does the control unit 6577 9134734-01 fail?

The most common trigger is a crash record that remained in the unit after an accident, even if no airbag deployed. Other causes include aged components, cold solder joints, moisture at plug connections and voltage spikes at the 6577 9134734-01.

Crash data cannot be deleted with a standard diagnostic tool. Deleting it is part of the repair at Airbag24.

Aged components become more susceptible over time. Solder joints can develop weak points, and moisture attacks connectors as soon as corrosion forms.

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

How can you tell that the 6577 9134734-01 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently as soon as a fault is present in the 6577 9134734-01. Additionally, a fault message in the instrument cluster, a missing connection to the diagnostic tool or a fault memory that cannot be cleared may occur. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The light therefore warns you directly, and you do not have to wait for a later check.

Please have the display read out by a workshop promptly, rather than continuing to drive with the light on.

Which vehicles is the 6577 9134734-01 fitted in?

The control unit 6577 9134734-01 is installed in these vehicles: BMW 3 Series E93 Convertible (2007-2010) and E93 LCI Convertible (2010-2013). What counts is what we have recorded for this number.

The vehicles in detail:

• BMW 3 Series E93 Convertible (2007-2010)
• BMW 3 Series E93 LCI Convertible (2010-2013)

Comparing the part number on the label with this page ensures that you have removed the correct unit. You should still have the fault memory read out before removal, because only it shows whether the control unit itself is defective or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 65 77 9 143 823, 65 77 9 159 794, 65 77 9 189 906, 65 77 9 214 812, 6577 9187933-01, 6577924829801.

How does the repair of the 6577 9134734-01 work?

For the 6577 9134734-01, first have the fault memory read out and attach the log. In the next step, disconnect the battery, and only then remove the control unit. Finally, create a repair order online and send the well-packed unit in.

At Airbag24 the unit is first checked on the test bench, then defective components are repaired and stored crash data is deleted. A functional test follows, and your own unit is returned to you. Processing usually takes 3–4 working days.

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 6577 9134734-01 get to Airbag24?

The unit goes to Airbag24 as a parcel, or you can book a UPS collection for an extra charge. After the repair, Airbag24 returns the control unit 6577 9134734-01 by UPS.

Include the printed repair order with the parcel, and pack the unit shockproof.