Airbag control unit with part number 77960-SNB-T021-M1

What does the airbag control unit 77960-SNB-T021-M1 do?

The airbag control unit 77960-SNB-T021-M1 controls the restraint system (SRS) in vehicles of Honda. It checks the signals from the crash sensors, decides within milliseconds in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the entire system.

The unit reports faults in the system via the airbag warning light, so you can read the state at any time in the instrument cluster.

After an accident, the control unit stores crash data and locks itself. This process is a fixed part of how the unit operates.

Why does the control unit 77960-SNB-T021-M1 fail?

Stored crash data is the most common cause on the 77960-SNB-T021-M1, even if no airbag has deployed. Aged components, cold solder joints, moisture and corrosion, and voltage spikes are also possible causes.

Crash data cannot be erased with a normal diagnostic tool. It therefore remains stored in the control unit, even if the vehicle appears undamaged from the outside.

Electronic components age, and solder joints can go cold. Moisture and corrosion attack the plug connections. Voltage spikes arise, for example, from a weak battery or when a jump start is connected.

How can you tell that the 77960-SNB-T021-M1 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently. In addition, an error message appears, the diagnostic tool finds no connection to the control unit 77960-SNB-T021-M1, and the fault memory cannot be cleared.

In a critical situation, the airbags and seatbelt pretensioners may then not be able to deploy. That is why the warning must be taken seriously.

The warning light reports the defect itself, so you do not have to search for it first.

Which vehicles is the 77960-SNB-T021-M1 fitted in?

The airbag control unit 77960-SNB-T021-M1 is fitted in these vehicles: Honda Civic 8th generation (2005-2011).

The following list shows the vehicles assigned to this part number.

• Honda Civic 8th generation (2005-2011)

Compare the part number on the label of the removed unit with this page, to confirm that you have the correct unit in front of you. Also have the fault memory read out beforehand, because the result shows whether the control unit is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-S02-A840-M3, 77960-SMG-G014-M1.

How does the repair of the 77960-SNB-T021-M1 work?

First have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit. Afterwards create a repair order online and send the unit in, well packed.

Airbag24 tests 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. Your own unit is then returned to you.

The sequence is mandatory for safety reasons. 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 77960-SNB-T021-M1 get to Airbag24?

You send the control unit 77960-SNB-T021-M1 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

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