Airbag control unit with part number 77960-SNA-M422-M1

What does the airbag control unit 77960-SNA-M422-M1 do?

The 77960-SNA-M422-M1 regulates the restraint system (SRS) at Honda: it checks the crash sensors, decides on the triggering of airbags and seatbelt pretensioners within milliseconds in an accident, and monitors the system continuously. A fault is indicated via the airbag warning light.

During normal driving the control unit reads measured values continuously and compares them with the stored specifications.

If the vehicle has been involved in an accident, crash data are then in the memory, and the unit locks itself.

Why does the control unit 77960-SNA-M422-M1 fail?

The main cause is crash data that remain in the 77960-SNA-M422-M1 after an accident, even if no airbag has fired. Diagnostic tools in normal operation cannot remove them; during the repair by Airbag24 they are erased.

The fact that the airbags were left untouched is therefore no proof that nothing was stored.

Other causes that also come into question:

• Electronic components that lose performance over time
• Solder joints that have gone cold
• Moisture or corrosion at plug connectors
• Voltage spikes, for example from a weak battery or jump start

How strongly the individual causes weigh in on a particular unit remains open without testing.

How can you tell that the 77960-SNA-M422-M1 is defective?

A defect on the 77960-SNA-M422-M1 may show itself through the airbag warning light in the instrument cluster, which stays on permanently or intermittently. Error messages in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be cleared also point to it. In an emergency, airbags and seatbelt pretensioners may then be unable to trigger.

Such signs should be checked promptly, because the entire restraint system may be affected. Waiting brings no advantage here.

Which vehicles is the 77960-SNA-M422-M1 fitted in?

According to our information, the 77960-SNA-M422-M1 belongs to: Honda Civic 8th generation (2005-2011).

Here is the vehicle assignment for this part number:

• Honda Civic 8th generation (2005-2011)

Before you remove the control unit, read out the fault memory. Only then can it be clearly established whether the control unit itself is affected or whether a plug or a cable is. Then compare the part number on the label with this page.

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-SNA-M422-M1 work?

Before removal you read out the fault memory and enclose the log; then you create a repair order online and remove the 77960-SNA-M422-M1. Processing at Airbag24 for the 77960-SNA-M422-M1 usually takes 3–4 working days.

You have the fault memory read out before you disconnect the battery and remove the control unit.

Airbag24 checks the unit, replaces defective components, erases stored crash data and carries out a function test. Your own unit then goes back to you. The stated time refers only to the work at Airbag24 and nothing else.

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-M422-M1 get to Airbag24?

You send the control unit 77960-SNA-M422-M1 yourself as a parcel, or you arrange a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

Enclose the printed repair order with the parcel; the unit should be packed shockproof.