Airbag control unit with part number 77960-T2A-X013-M4

What does the airbag control unit 77960-T2A-X013-M4 do?

The airbag control unit 77960-T2A-X013-M4 is the control unit of the restraint system (SRS) of Honda. It evaluates the crash sensors, determines in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

Monitoring runs without interruption during operation. In this way the unit detects faults early and reports them to the instrument cluster.

The feedback comes via the airbag warning light, which you should therefore keep an eye on.

Why does the control unit 77960-T2A-X013-M4 fail?

Crash data stored after an accident is the most common cause, even if no airbag has deployed, and an ordinary diagnostic tool cannot erase it. Other possible causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Stored crash data stays in the unit until it is erased during repair. Workshop diagnostics cannot reach this entry.

The other causes concern the technology of the unit. Ageing components and cold solder joints lead to contact problems. Moisture and corrosion at plug connections impair the signals, and voltage spikes from a weak battery or a jump start strain the electronics.

How can you tell that the 77960-T2A-X013-M4 is defective?

A defect shows up as the airbag warning light in the instrument cluster lighting up permanently or intermittently, as an error message, as a diagnostic tool without connection, and as a fault memory that cannot be cleared. In that case airbags and seatbelt pretensioners may fail to deploy in a crash.

The airbag warning light in the instrument cluster lights up as soon as the unit detects a defect. It thus indicates the fault and requires a check before the vehicle is driven further.

A fault memory that cannot be cleared, and a connection the diagnostic tool cannot establish, are further indications of a problem with the control unit.

Which vehicles is the 77960-T2A-X013-M4 fitted in?

The 77960-T2A-X013-M4 is fitted in these vehicles: Honda Accord 9th generation (2012-2019).

The list shows the vehicles stored for this part number.

• Honda Accord 9th generation (2012-2019)

Compare the part number on the label of the removed unit with this page, and you can see that it is the correct unit. Have the fault memory read out beforehand, because only that result shows whether the control unit or a plug or cable is responsible for the fault.

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-X013-M4 work?

First have the fault memory read out and enclose the log. Then disconnect the battery, and only after that remove the control unit. Next, create a repair order online and pack the unit well. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 examines the unit on the test bench, replaces defective components where necessary and erases the crash data. A function test follows, and then 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-T2A-X013-M4 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

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