Airbag control unit with part number 77960-T3L-C012-M4

What does the airbag control unit 77960-T3L-C012-M4 do?

The airbag control unit 77960-T3L-C012-M4 is the central control unit of the restraint system (SRS) of Honda. It evaluates the signals from the crash sensors and decides in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered.

In addition, the unit monitors the entire restraint system continuously. It reports faults via the airbag warning light in the instrument cluster.

After an accident, it stores crash data and locks itself. The lock is only lifted by the repair.

Why does the control unit 77960-T3L-C012-M4 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data remains stored until Airbag24 removes it during the repair. This cause is therefore the first thing to rule out in any fault search.

Electronic components age, and solder joints can lose their contact over time. Moisture and corrosion attack plug connections. Voltage spikes, for example from a weak battery or a jump start, put additional strain on the electronics.

Only the test at Airbag24 will establish which of these causes is actually present.

How can you tell that the 77960-T3L-C012-M4 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently. In addition, there is a fault message in the instrument cluster, no connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then not trigger. You should therefore not ignore a lit warning light.

A single sign does not reveal the cause. Only reading out the fault memory shows whether the control unit is affected or whether a wire is the cause.

Which vehicles is the 77960-T3L-C012-M4 fitted in?

The 77960-T3L-C012-M4 is fitted in these vehicles: Honda Accord 10th generation (2017-2024) and 11th generation (from 2023).

The following vehicles are on record for this part number:

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

Compare the part number on the label of the removed unit with this page. That only confirms that you have the right unit.

Have the fault memory read out before removal. The result shows whether the control unit is defective or whether a plug or a cable is the cause.

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-C012-M4 work?

Processing at Airbag24 usually takes 3–4 working days. Beforehand, you have the fault memory read out and attach the log, then disconnect the battery and remove the control unit.

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

The stated time applies exclusively to checking, repairing and testing at Airbag24. Afterwards, 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-T3L-C012-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 returns it to you by UPS.

Put the printed repair order into the parcel and pack the control unit so that it is shockproof.