Airbag control unit with part number 77960-T2A-D011-M4

What does the airbag control unit 77960-T2A-D011-M4 do?

The airbag control unit 77960-T2A-D011-M4 is the central control unit of the SRS restraint system of Honda. It processes the signals from the crash sensors, decides in an accident within milliseconds on airbags and seatbelt pretensioners, and monitors the system continuously.

It shows detected faults via the airbag warning light in the instrument cluster. It also writes deviations to the fault memory, from which the condition can be read out later.

After an accident it stores crash data and then locks itself.

Why does the control unit 77960-T2A-D011-M4 fail?

The most common trigger is crash data that remains in memory after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Ageing components, cold solder joints, moisture or corrosion at plug connections, and voltage spikes are also involved.

Crash data remains in the unit until it is removed during the repair. If the unit fails, a stored event must therefore also be checked as a cause.

The other causes relate to the age of the components and the environment of the plug connections. Moisture and corrosion impair the contact, and voltage spikes can damage the electronics.

How can you tell that the 77960-T2A-D011-M4 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently, a fault message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The warning light indicates a defect and should therefore never be ignored. If it stays on or comes on while driving, have the system checked promptly.

A missing connection to the diagnostic tool is also a warning sign.

Which vehicles is the 77960-T2A-D011-M4 fitted in?

The airbag control unit 77960-T2A-D011-M4 is fitted in these vehicles: Honda Accord 9th generation (2012-2019).

The list gives the vehicles for which this unit is intended.

• Honda Accord 9th generation (2012-2019)

Before removal, compare the part number on the label of the unit with this page. This only confirms that you have the correct unit. Have the fault memory read out beforehand, because only this result 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-D011-M4 work?

Have the fault memory read out and enclose the log before you disconnect the battery. Only then remove the control unit, create a repair order online and send the unit in well packed. Airbag24 usually needs 3–4 working days for testing, repairing and checking.

The unit is tested on the test bench at Airbag24, defective components are replaced and crash data is erased. A function test completes the work, then your own unit is returned 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-D011-M4 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. Airbag24 sends it back to you by UPS after the repair.

Pack the printed repair order into the parcel and pack the unit shockproof.