Airbag control unit with part number 77960-T2A-Y620-M4

What does the airbag control unit 77960-T2A-Y620-M4 do?

The airbag control unit 77960-T2A-Y620-M4 is the central control unit of the restraint system (SRS) for Honda. It processes the signals from the crash sensors and determines in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered.

During operation it monitors all components and reports faults via the airbag warning light in the instrument cluster. This notice therefore appears before it matters in an emergency.

After an accident, it stores crash data and remains locked afterwards.

Why does the control unit 77960-T2A-Y620-M4 fail?

The most common cause of a failure of the 77960-T2A-Y620-M4 is stored crash data, even if no airbag was triggered. Other causes are ageing electronic components, cold solder joints, moisture and corrosion, and voltage spikes.

Crash data of this kind does not disappear with a normal diagnostic tool. Airbag24 deletes it during the repair.

Ageing components and cold solder joints impair the function of the electronics.

Moisture and corrosion at plug connections, as well as voltage spikes, for example from a weak battery or jump-starting, round off the picture.

How can you tell that the 77960-T2A-Y620-M4 is defective?

A defect in the 77960-T2A-Y620-M4 can be recognised by the airbag warning light, which stays on permanently or intermittently. In addition, fault messages appear in the instrument cluster, or the diagnostic tool finds no connection to the control unit.

A fault memory that cannot be cleared also counts as a sign. In such a state, airbags and seatbelt pretensioners may fail to trigger in an emergency, which is why the warning light is an important hint.

The light shows the defect on its own and deserves attention on every journey.

Which vehicles is the 77960-T2A-Y620-M4 fitted in?

The control unit 77960-T2A-Y620-M4 is fitted in these vehicles: Honda Accord 9th generation (2012-2019). The list shows which cars are recorded for this part number.

These vehicles are recorded:

• Honda Accord 9th generation (2012-2019)

First compare the part number on the label of the removed unit with this page, so that it is clear which unit you have. Then have the fault memory read, because only that shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-SEA-G815-M1, 77960-T3L-A012-M1, C0W6K4VDA.

How does the repair of the 77960-T2A-Y620-M4 work?

Have the fault memory read and enclose the log with the unit. Then disconnect the battery, and only then remove the 77960-T2A-Y620-M4. Create the repair order online and pack the unit well.

At Airbag24 the unit is checked on the test bench, defective components are repaired, crash data is deleted and a function test is carried out. Processing usually takes 3–4 working days.

Then your own 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-T2A-Y620-M4 get to Airbag24?

You send the control unit 77960-T2A-Y620-M4 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back by UPS.

The printed repair order goes into the parcel, and the control unit is packed shockproof.