Airbag control unit with part number 77960-3A0-H820-M2

What does the airbag control unit 77960-3A0-H820-M2 do?

The airbag control unit 77960-3A0-H820-M2 coordinates the airbags and seatbelt pretensioners in the restraint system (SRS) of Honda. The signals from the crash sensors converge there, and in the event of an impact the unit decides within milliseconds which components trigger. It reports faults via the airbag warning light.

After an accident, the control unit stores crash data and then locks itself. It is one of the most important components of the system, because all other parts depend on its decisions.

The unit monitors the entire system during operation, including when the vehicle is merely standing and nobody is driving it.

Why does the control unit 77960-3A0-H820-M2 fail?

Stored crash data is the most common cause, even without a triggered airbag, and 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.

Stored crash data arises as soon as the unit registers an accident. That no airbag was triggered does not rule out storage, which is exactly why it is worth checking the memory even then.

The other causes are of a more general nature. Electronics age, solder joints can go cold, and moisture as well as corrosion affect plug connections. Voltage spikes arise, for example, with a weak battery or when a jump-starter is connected.

How can you tell that the 77960-3A0-H820-M2 is defective?

A defect shows on the airbag warning light in the instrument cluster, which lights up permanently or intermittently, on a fault message in the instrument cluster, on a missing connection to the diagnostic tool, or on a fault memory that cannot be cleared. In that case, airbags and seatbelt pretensioners may possibly not trigger in an emergency.

The warning light is the clearest sign, because it shows the system's faults. When it lights up, you have a clear indication that the system has detected a fault.

If the diagnostic tool gets no contact with the control unit or the fault memory cannot be cleared, a closer check by reading out is advisable.

Which vehicles is the 77960-3A0-H820-M2 fitted in?

The 77960-3A0-H820-M2 is fitted in these vehicles: Honda CR-V 6 (from 2022).

The list below shows the vehicles in which this part number is recorded.

• Honda CR-V 6 (from 2022)

On the one hand, compare the part number on the label of the removed unit with this page. That only tells you that you have the correct unit, nothing more. On the other hand, have the fault memory read out before removing the unit. Only that log shows whether the control unit itself is defective or whether a plug or cable is the cause.

How does the repair of the 77960-3A0-H820-M2 work?

First have the fault memory read out and attach the log, then disconnect the battery, only afterwards remove the control unit, and create a repair order online. Airbag24 checks the well-packed unit, repairs defective components, erases the crash data and carries out a function test; processing usually takes 3–4 working days.

The sequence protects you during removal, so please keep to it. Removal follows only once the battery is disconnected.

After the function test, the unit goes back to the address it came from.

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 77960-3A0-H820-M2 get to Airbag24?

The unit reaches us by parcel or by a booked UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.