Airbag control unit with part number 77960-SNB-J815-M1

What does the airbag control unit 77960-SNB-J815-M1 do?

The airbag control unit 77960-SNB-J815-M1 is the central control unit of the restraint system (SRS) of Honda. It evaluates the signals from the crash sensors, determines in an accident within fractions of a second which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It reports faults via the airbag warning light.

The unit is in operation at all times and checks the connections to sensors, seatbelt pretensioners and airbags in the background. If a deviation is present, it is recorded in the fault memory.

After an accident the control unit stores crash data and locks itself. The lock only ends with the repair.

Why does the control unit 77960-SNB-J815-M1 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

Crash data is created when the unit registers an impact. Even if no airbag has been triggered, it remains in the memory and cannot be removed with a normal diagnostic tool.

Independently of this, the electronic components age. Cold solder joints on the circuit board lose contact, and moisture or corrosion at the plug connections disturb the transmission of signals.

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

How can you tell that the 77960-SNB-J815-M1 is defective?

Signs are an airbag warning light in the instrument cluster that stays on permanently or intermittently, an error message in the instrument cluster, a diagnostic tool without connection to the control unit, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The following points show how you can recognise a defect:

• Airbag warning light stays on permanently
• Airbag warning light stays on intermittently
• Error message in the instrument cluster
• No connection to the control unit from the diagnostic tool
• Fault memory cannot be cleared

If you notice any of these signs, have the system checked promptly.

Which vehicles is the 77960-SNB-J815-M1 fitted in?

The airbag control unit 77960-SNB-J815-M1 is fitted in these vehicles: Honda Civic 8th generation (2005-2011).

The following vehicles are 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; this only clarifies whether it is the right unit. Whether the control unit is defective or a plug or cable is the cause is only shown by the fault memory log read out beforehand.

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-J815-M1 work?

First have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit. Next, create a repair order online and send in the unit well packed. At Airbag24, processing usually takes 3–4 working days.

At Airbag24, the unit is examined on the test bench and defective components are repaired. Afterwards Airbag24 erases the stored crash data and carries out a function test, before the unit is returned.

The order is important for safety, because the unit may only be removed after the battery has been disconnected.

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-J815-M1 get to Airbag24?

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

Place the printed repair order in the parcel and pack the unit shock-proof.