Airbag control unit with part number 77960-T2A-L011-M4

What does the airbag control unit 77960-T2A-L011-M4 do?

In the Honda, the airbag control unit 77960-T2A-L011-M4 is the switching centre of the restraint system (SRS). Based on the crash sensors, it determines in an impact which airbags and seatbelt pretensioners are triggered, and it does so within milliseconds.

It checks the wiring and the components continuously. If it finds a fault, the airbag warning light in the instrument cluster comes on.

After an accident it creates crash data and remains locked afterwards.

Why does the control unit 77960-T2A-L011-M4 fail?

Crash data stored after an accident is the most common cause, even if no airbag has deployed. Other factors include ageing components, moisture and corrosion on the plug connections, cold solder joints and voltage spikes.

Crash data remains in the unit after the event, even if the vehicle continues to run normally afterwards. A normal diagnostic tool does not erase it.

The other causes are of a general nature: electronic components age, solder joints can become faulty, and voltage spikes occur, for example, with a weak battery or jump-starting.

How can you tell that the 77960-T2A-L011-M4 is defective?

The airbag warning light in the instrument cluster is the most important indication when it stays on permanently or only intermittently. Accompanying this, fault messages, connection problems or a fault memory that cannot be cleared may appear.

• Warning light stays on permanently or only comes on intermittently
• Fault message in the instrument cluster
• Diagnostic tool cannot find the control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may fail to trigger as long as the fault persists. Have the warning light checked promptly.

Which vehicles is the 77960-T2A-L011-M4 fitted in?

The 77960-T2A-L011-M4 is fitted in these vehicles: Honda Accord 9th generation (2012-2019).

The vehicles that match this part number are shown in this overview:

• Honda Accord 9th generation (2012-2019)

Compare the part number on the label of your removed unit with this page; that only confirms the identity of the unit. Have the fault memory read out beforehand, because only the log shows whether the control unit or 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-L011-M4 work?

Above all, have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Create a repair order online and send in the unit well packed. Testing, repairing and checking at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, renews defective components, erases stored crash data and carries out a function test. Afterwards your own unit goes back to you.

This order of steps is safety-relevant. 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-L011-M4 get to Airbag24?

You send the control unit as a parcel or have it collected by UPS for an extra charge. After the repair, Airbag24 returns it by UPS.

Enclose the printed repair order with the parcel and pack the control unit shock-proof.