Airbag control unit with part number 77960-T3L-C030-M4

What does the airbag control unit 77960-T3L-C030-M4 do?

The airbag control unit 77960-T3L-C030-M4 is the central control unit of the SRS restraint system for Honda. It checks the sensors and connections of the system without interruption and, in an accident, decides which airbags and seatbelt pretensioners are triggered.

The decision is made within milliseconds on the basis of the signals from the crash sensors. If the unit reports a fault, it appears via the airbag warning light.

After an accident the control unit writes crash data into its memory and then locks itself.

Why does the control unit 77960-T3L-C030-M4 fail?

On the 77960-T3L-C030-M4, stored crash data after an accident is the most common cause, even if no airbag has triggered at all. Other causes are aged components, cold solder joints, moisture at plug connectors and voltage spikes.

A normal diagnostic tool cannot erase the crash data. Airbag24 removes it during the repair.

Aged electronic components and cold solder joints, which make themselves noticed over time, are also possible causes. Moisture and corrosion at plug connectors, as well as voltage spikes, for example from a weak battery or when starting with external power, can likewise cause a failure.

How can you tell that the 77960-T3L-C030-M4 is defective?

On the 77960-T3L-C030-M4 you recognise a defect by the airbag warning light in the instrument cluster, which lights up permanently or from time to time. Also present are a fault message in the instrument cluster and a diagnostic tool that cannot establish a connection to the control unit.

A fault memory that cannot be cleared also points to a defect. The warning light catches the eye when you get in or while driving, in the instrument cluster.

As long as the defect exists, airbags and seatbelt pretensioners may not trigger in an emergency. So take the warning light seriously and have the fault checked.

Which vehicles is the 77960-T3L-C030-M4 fitted in?

The details apply to Honda. The control unit 77960-T3L-C030-M4 is fitted in these vehicles: Honda Accord 10th generation (2017-2024) and 11th generation (from 2023).

The vehicles for which this part number is stored are shown here:

• Honda Accord 10th generation (2017-2024)
• Honda Accord 11th generation (from 2023)

Comparing the part number on the label of the removed unit with this page only confirms that it is the right unit. Whether the control unit itself is defective, or whether a plug or cable is the cause, is shown only by the fault memory read out. Have it read out before removal.

For the same vehicles, we also repair control units with the part numbers 77960-SDA-L814-M1, 77960-T3L-A012-M1, 77960-T3L-A01M1.

How does the repair of the 77960-T3L-C030-M4 work?

Processing at Airbag24 takes 3–4 working days and covers only checking, repairing and testing. Your own steps start separately from this with reading out the fault memory, enclosing the log, disconnecting the battery and removing the 77960-T3L-C030-M4.

Then create the repair order online and send the unit in well packed. Airbag24 checks the control unit on the test bench, replaces defective components, erases crash data and carries out a function test.

Afterwards the 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-T3L-C030-M4 get to Airbag24?

The 77960-T3L-C030-M4 reaches Airbag24 as a parcel, either sent by you yourself or with a UPS collection booked for an extra charge. After the repair Airbag24 returns the unit to you by UPS.

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