Airbag control unit with part number 77960-SNA-H811-M1

What does the airbag control unit 77960-SNA-H811-M1 do?

The airbag control unit 77960-SNA-H811-M1 coordinates the restraint system (SRS) in Honda. It reads the signals from the crash sensors, determines in the event of an accident which airbags and seatbelt pretensioners are to be triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

If the unit detects a fault, it reports it via the airbag warning light in the instrument cluster. During normal driving the electronics work in the background; there is nothing for the driver to do.

Why does the control unit 77960-SNA-H811-M1 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed, and a normal diagnostic tool cannot erase it. Aged components, cold solder joints, moisture and corrosion at plugs as well as voltage spikes are also possible causes.

The data is created by the accident and remains in the control unit's memory. The fact that no airbag fired does not change this. The other causes at a glance:

• Electronics that deteriorate over time
• Solder joints with damage
• Moisture or corrosion at plug connections
• Voltage spikes, for example with a weak battery or jump-starting

How can you tell that the 77960-SNA-H811-M1 is defective?

In the vehicle, a defect shows through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, through a fault message in the instrument cluster or through a diagnostic tool that cannot establish a connection to the control unit. A fault memory that cannot be cleared also points to it. In an emergency, airbags and seatbelt pretensioners may then not trigger.

The airbag warning light in the instrument cluster is the first signal you notice. If it stays lit, have it checked promptly, because the display concerns the restraint system itself.

A connection problem with the diagnostic tool and a stubborn fault memory fit this; both are considered together.

Which vehicles is the 77960-SNA-H811-M1 fitted in?

The 77960-SNA-H811-M1 is used in these vehicles: Honda Civic 8th generation (2005-2011). The entry that matches your car is shown in the list.

Specifically, these vehicles are concerned:

• Honda Civic 8th generation (2005-2011)

Compare the part number on the label of the removed control unit with this page, so you can be sure you are using the correct unit. Also have the fault memory read out before you remove anything, because only this result shows whether the control unit is defective or a connector 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-H811-M1 work?

For the 77960-SNA-H811-M1 the fault memory is read out first with the log enclosed, then the battery is disconnected and only then is the control unit removed. Afterwards you create a repair order online and send the unit in well packed. The inspection, repair and function test at Airbag24 usually take 3–4 working days.

You enclose the log with the order, so the starting situation is known. Disconnecting the battery is part of the safe procedure.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test at the end. Then your control unit is returned to you.

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-H811-M1 get to Airbag24?

Either you send the unit as a parcel or you book a UPS collection for an extra charge. Airbag24 sends the control unit back by UPS after the repair.

You enclose the printed repair order and pack the unit shockproof.