Airbag control unit with part number 77960-SNA-A216-M1

What does the airbag control unit 77960-SNA-A216-M1 do?

The airbag control unit 77960-SNA-A216-M1 controls the restraint system (SRS) for Honda. It evaluates the crash sensors, decides in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident, it stores crash data and locks itself.

The control unit reports faults via the airbag warning light in the instrument cluster, which is how the driver learns of them.

Seatbelt pretensioners are also controlled through this unit, which is why faults affect the entire restraint function.

Why does the control unit 77960-SNA-A216-M1 fail?

The most common cause: crash data stored after an accident, even if no airbag has deployed. A standard diagnostic tool cannot erase the crash data. Aged electronics, cold solder joints, moisture at plugs and voltage spikes are also possible causes, and Airbag24 erases the crash data during the repair.

Crash data remains stored in the control unit after an event, even if no airbag has deployed.

Aged electronic components and cold solder joints can impair the function.

Moisture and corrosion at plug connections degrade the contact. Voltage spikes, for example from a weak battery or a jump start, additionally stress the electronics.

How can you tell that the 77960-SNA-A216-M1 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently when there is a fault in the 77960-SNA-A216-M1. A fault message in the instrument cluster appears alongside it. The diagnostic tool also finds no connection to the control unit, and the fault memory cannot be erased.

The signs in detail:

• airbag warning light on permanently or intermittently
• fault message in the instrument cluster
• no connection between the diagnostic tool and the control unit
• fault memory cannot be erased

In an emergency, airbags and seatbelt pretensioners may fail to deploy, so a warning like this deserves a prompt check.

Which vehicles is the 77960-SNA-A216-M1 fitted in?

Whether it is fitted in your vehicle depends on model and year of manufacture. The 77960-SNA-A216-M1 is fitted in these vehicles: Honda Civic 8th generation (2005-2011).

In detail, the list looks like this:

• Honda Civic 8th generation (2005-2011)

Comparing the part number on the label of the removed unit with this page only ensures that you have the correct unit. Have the fault memory read out beforehand; only this result 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 77960-SMG-G014-M1, 77960-SMG-G021-M1, 77960-SMG-G120-M1, 77960-SNA-L220-M1, 77960-SNA-L230-M1, 77960-SNA-M410-M1.

How does the repair of the 77960-SNA-A216-M1 work?

First have the fault memory read out and attach the log, then disconnect the battery. Only after that do you remove the control unit, and then create a repair order online. Finally, send the unit in, carefully packed.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards, the repaired unit is returned to you.

Processing takes 3–4 working days as a rule. It covers only checking, repairing and testing.

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-SNA-A216-M1 get to Airbag24?

You send the 77960-SNA-A216-M1 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

The printed repair order you have made goes into the parcel, and the unit must be packed shock-proof.