Airbag control unit with part number 77960-T2V-Y011-M4

What does the airbag control unit 77960-T2V-Y011-M4 do?

The airbag control unit 77960-T2V-Y011-M4 is the central control unit of the restraint system (SRS) of Honda. It evaluates the crash sensors and determines in an accident which airbags and seatbelt pretensioners trigger, within milliseconds.

During operation, it monitors all components. It shows detected faults via the airbag warning light in the instrument cluster.

After an accident, the unit records crash data and locks itself.

Why does the control unit 77960-T2V-Y011-M4 fail?

Stored crash data from an accident is the most common cause with the 77960-T2V-Y011-M4, even when no airbag has been triggered. The other causes are ageing electronics, cold solder joints, moisture and corrosion on plugs, and voltage spikes.

A standard diagnostic tool does not erase this data. It therefore stays in the control unit, even if the vehicle continues to run afterwards.

Ageing components and cold solder joints impair function over a longer period. Moisture and corrosion affect plug connections, while voltage spikes can come from a weak battery or jump-starting.

How can you tell that the 77960-T2V-Y011-M4 is defective?

You recognise a defect in the 77960-T2V-Y011-M4 by the airbag warning light, which stays on permanently or intermittently. Also present are an error message in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be cleared.

The warning light in the instrument cluster shows the finding. An error message on the display accompanies it.

The diagnostic tool then finds no connection to the control unit, and the fault memory persists. In an emergency, airbags and seatbelt pretensioners may therefore fail to trigger.

Which vehicles is the 77960-T2V-Y011-M4 fitted in?

The 77960-T2V-Y011-M4 is fitted in these vehicles: Honda Accord 9th generation (2012-2019). The part number on the removed unit can be compared with this page.

The list below shows the vehicles stored for this unit.

• Honda Accord 9th generation (2012-2019)

The label comparison only shows that you have the right unit in front of you. Whether the control unit is defective or a plug or cable is the cause is shown only by the fault memory read out beforehand.

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-T2V-Y011-M4 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the 77960-T2V-Y011-M4. Create the repair order online and send the well-packed unit in.

Observe the sequence, because the unit is only removed once the battery has been disconnected. The log belongs in the parcel so that Airbag24 knows the condition.

At the test bench, Airbag24 inspects the unit, replaces defective components and deletes the stored crash data. A function test follows, and then your own unit goes back to you. Processing usually takes 3–4 working days. 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-T2V-Y011-M4 get to Airbag24?

You send the control unit 77960-T2V-Y011-M4 as a parcel, or you book a UPS collection for an extra charge. Airbag24 sends it back to you by UPS after the repair.

The printed repair order goes into the parcel, and the unit must be packed shock-proof.