Airbag control unit with part number 77960-SNA-A218-M1

What does the airbag control unit 77960-SNA-A218-M1 do?

The airbag control unit 77960-SNA-A218-M1 brings the restraint systems (SRS) together in Honda. It checks the signals from the crash sensors, decides in an accident on airbags and seatbelt pretensioners, and monitors the system permanently. After an accident it stores crash data and locks itself; the lock is lifted only by the repair.

If the unit detects a fault, it switches on the airbag warning light in the instrument cluster. That way you notice that something in the system is not right.

Monitoring runs in the background throughout the entire journey.

Why does the control unit 77960-SNA-A218-M1 fail?

The stored crash data after an accident is the most common cause, and it remains even if no airbag has deployed. It cannot be erased with an ordinary diagnostic tool. Other causes include aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

The control unit stores the data in memory and keeps it there.

Other causes act more slowly. Components age, solder joints lose their hold, and moisture as well as corrosion attack plug contacts.

Voltage spikes arise when the vehicle electrical system collapses or a jump start is given.

How can you tell that the 77960-SNA-A218-M1 is defective?

A defect on the 77960-SNA-A218-M1 shows up at the airbag warning light in the instrument cluster. A fault message, or a fault memory that cannot be cleared, also indicates it.

• Airbag warning light lights up permanently
• Airbag warning light lights up intermittently
• Fault message in the instrument cluster
• Diagnostic tool cannot find the control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may then not deploy. Therefore have the restraint system checked promptly.

Which vehicles is the 77960-SNA-A218-M1 fitted in?

Part numbers determine which type of unit is fitted. The control unit 77960-SNA-A218-M1 is fitted in these vehicles: Honda Civic 8th generation (2005-2011).

The overview looks like this:

• Honda Civic 8th generation (2005-2011)

Before you remove the unit, compare the part number on the label with this page. This only confirms that you have the correct unit, nothing more. Have the fault memory read out beforehand, because only this result shows whether the control unit is defective or 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-A218-M1 work?

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

At Airbag24 the unit is first examined on the test bench. We then repair defective components, erase stored crash data and carry out a function test. Afterwards the unit goes back to you.

Processing takes 3–4 working days as a rule.

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-A218-M1 get to Airbag24?

The unit goes to us as a parcel, or you book a UPS collection for an extra charge. We handle the return by UPS.

Pack the control unit shock-proof and enclose the printed repair order.