Airbag control unit with part number 77960-SNB-U422-M1

What does the airbag control unit 77960-SNB-U422-M1 do?

The airbag control unit 77960-SNB-U422-M1 coordinates the SRS restraint system of Honda. It processes the signals from the crash sensors and, in an impact, decides within milliseconds which airbags and seatbelt pretensioners to trigger.

It also checks the system continuously and shows faults on the airbag warning light. If an accident is registered, it stores crash data and locks itself; the repair lifts this lock.

Why does the control unit 77960-SNB-U422-M1 fail?

The most common cause is crash data that remains stored in the unit after an accident, even if no airbag has deployed. Added to this are ageing electronics, cold solder joints, moisture and corrosion at connectors, and voltage spikes.

Crash data cannot be deleted with a common diagnostic tool; it stays in the unit until it is removed. Airbag24 removes it as part of the repair.

The other causes develop gradually. Electronics age, cold solder joints can cause contact problems, and moisture attacks connectors. Voltage spikes, for example from a weak battery or a jump start, also affect the unit.

How can you tell that the 77960-SNB-U422-M1 is defective?

The airbag warning light in the instrument cluster, which stays on permanently or intermittently, is the clear sign. Possibly a fault message, a missing connection to the diagnostic tool or a fault memory that cannot be cleared will come with it. Then airbags and seatbelt pretensioners may not deploy in an emergency.

In detail, these signs stand out:

• Airbag warning light in the instrument cluster, permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool with no connection to the control unit
• Fault memory that cannot be cleared

The warning light keeps the state of the system constantly visible, which makes it a central sign.

Which vehicles is the 77960-SNB-U422-M1 fitted in?

The basis is the assignment held by Airbag24 for this control unit. The control unit 77960-SNB-U422-M1 is fitted in these vehicles: Honda Civic 8th generation (2005-2011).

The list below names the vehicles recorded for this control unit.

• Honda Civic 8th generation (2005-2011)

Comparing the part number on the label of the removed unit with this page only confirms the identity of the unit, and nothing more. The cause is clarified by the fault memory, which you have read out beforehand, because it shows whether the control unit is defective or whether a connector or a cable is responsible.

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-U422-M1 work?

First you have the fault memory read out and enclose the readout log with the unit. Then disconnect the battery, remove the control unit and create the repair order online. At Airbag24, processing usually takes 3–4 working days.

The sequence serves safety and cannot be changed.

At Airbag24, the unit is checked, defective components are replaced, the crash data is deleted and a function test is carried out at the end. Afterwards the unit goes back 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-SNB-U422-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 the unit by UPS.

You place the printed repair order in the parcel; pack the unit shockproof.