Airbag control unit with part number 77960-3V0-A820-M2

What does the airbag control unit 77960-3V0-A820-M2 do?

The airbag control unit 77960-3V0-A820-M2 controls the restraint system of Honda. It checks the sensor signals, determines in an accident which airbags and seatbelt pretensioners fire, and monitors the system continuously.

If the unit detects a fault, it indicates this via the airbag warning light in the instrument cluster.

After an accident it stores crash data and locks itself.

Why does the control unit 77960-3V0-A820-M2 fail?

The most common cause in the 77960-3V0-A820-M2 is crash data from an accident, even if no airbag has fired. A normal diagnostic tool does not retrieve it from the memory. Other causes include aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

The memory keeps the crash data until it is specifically removed.

The remaining causes lie in the electronics and the contacts. Moisture and salt damage plug connections, solder joints can be cold, and voltage spikes stress components, for example with a weak battery or jump-starting.

How can you tell that the 77960-3V0-A820-M2 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently as soon as there is a defect in the 77960-3V0-A820-M2. An error message appears in the instrument cluster alongside it, the diagnostic tool finds no connection, and the fault memory stays in place.

In an emergency, airbags and seatbelt pretensioners may then fail to deploy. The light marks precisely this condition and therefore calls for prompt clarification.

Which vehicles is the 77960-3V0-A820-M2 fitted in?

The airbag control unit 77960-3V0-A820-M2 is fitted in these vehicles: Honda HR-V 2nd generation (2015-2022). The details refer to Honda.

The list of vehicles reads:

• Honda HR-V 2nd generation (2015-2022)

Comparing the part number on the label of the removed unit with this page confirms that it is the right unit. Also have the fault memory read out before removal, as only the log 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 77960-3V0-A81, 77960-T7S-A21, 77960-T7S-A212-M2, 77960T7SK410M2.

How does the repair of the 77960-3V0-A820-M2 work?

Before removal, have the fault memory of the 77960-3V0-A820-M2 read out and attach the log. Then disconnect the battery and only afterwards remove the control unit. After that create a repair order online and send the unit in, well packed.

Airbag24 checks the unit on the test bench, renews defective components, deletes the stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days. The unit then 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 77960-3V0-A820-M2 get to Airbag24?

You send the control unit 77960-3V0-A820-M2 in as a parcel, or book a UPS collection for an extra charge. After the repair Airbag24 returns it by UPS.

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