Airbag control unit with part number 65.77-6910677

What does the airbag control unit 65.77-6910677 do?

The airbag control unit 65.77-6910677 controls the restraint system (SRS) in the BMW vehicle. It processes impact signals, determines within milliseconds in a crash whether airbags and seatbelt pretensioners are triggered, and checks the system continuously.

If it detects a fault, it shows this via the airbag warning light in the instrument cluster. After a crash, it stores crash data and locks itself.

The test routines run in the background, without you noticing them.

Why does the control unit 65.77-6910677 fail?

The most common cause is crash data that remain stored after a collision, even if no airbag has deployed. With this control unit, deleting the crash data is often not possible; if you want them deleted, get in touch with Airbag24 briefly before sending the unit in, and Airbag24 will then check the part number. Other possible causes include ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The fact that no airbag has deployed does not mean that nothing has been stored.

The other causes act on the electronics over a longer period.

How can you tell that the 65.77-6910677 is defective?

A defect on the 65.77-6910677 becomes recognisable through the airbag warning light, which lights up permanently or intermittently, through messages in the instrument cluster, through a diagnostic tool that cannot make contact, and through a fault memory that persists.

In the event of a defect, airbags and seatbelt pretensioners may possibly not deploy in an emergency. This applies regardless of whether the car runs normally day to day.

The warning light shows the fault. Take this notice seriously, even if you notice no other irregularities.

Which vehicles is the 65.77-6910677 fitted in?

Vehicles are on record for this part number. The control unit 65.77-6910677 is fitted in these vehicles: BMW Z3 E36/8 Coupé (1995-2002) and E36/7 Roadster (1995-2002).

The known models are listed here:

• BMW Z3 E36/8 Coupé (1995-2002)
• BMW Z3 E36/7 Roadster (1995-2002)

A comparison of the part number on the label with this page only shows that it is the correct unit. Have the fault memory read out first: 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 65.77-6908896, 65.77-8386192, 6577-8369828, 6577-8374799, 65778362119, 65778374798.

How does the repair of the 65.77-6910677 work?

Have the fault memory read out and attach the log, then disconnect the battery before removing the control unit. Then create a repair order online and send the unit in, well packed. Airbag24 generally needs 3–4 working days for inspection, repair and testing.

Airbag24 examines the unit on the test bench, and defective components are replaced. A functional test follows, and then your own unit is returned to you.

If you want the crash data deleted, get in touch with Airbag24 briefly before sending the unit in.

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 65.77-6910677 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

The printed repair order goes into the parcel, and you pack the unit shockproof.