Airbag control unit with part number 77960-T2A-A030-M4

What does the airbag control unit 77960-T2A-A030-M4 do?

The airbag control unit 77960-T2A-A030-M4 coordinates the restraint system (SRS) in Honda vehicles. It processes the readings from the crash sensors and triggers airbags and seatbelt pretensioners in an accident, within fractions of a second. At the same time, it monitors the entire system.

If the unit detects a fault, it reports it via the airbag warning light and stores it in the fault memory. Monitoring runs constantly, even during normal driving.

If an accident has occurred, the control unit stores crash data and locks itself. The next section explains what this data means for the repair.

Why does the control unit 77960-T2A-A030-M4 fail?

The cause is most often stored crash data from an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase this data. Aged electronics, cold solder joints, moisture and corrosion, as well as voltage spikes, are also possible causes.

Airbag24 removes the crash data during the repair.

Aged components and cold solder joints are hard to judge from the outside. Moisture and corrosion attack the plug connections, while voltage spikes, for example from a weak battery or jump-starting, put strain on the electronics.

How can you tell that the 77960-T2A-A030-M4 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears, or the diagnostic tool finds no connection to the control unit. A fault memory that cannot be cleared also belongs here. Airbags and seatbelt pretensioners may then fail to trigger in an emergency.

The signs can occur individually or together, depending on the cause:

• Airbag warning light lit permanently or intermittently
• Fault message in the instrument cluster
• No connection between the diagnostic tool and the control unit
• Fault memory cannot be cleared

The warning light shows the finding itself, which is why reading out the fault memory is worthwhile.

Which vehicles is the 77960-T2A-A030-M4 fitted in?

The assignment depends on this part number. The 77960-T2A-A030-M4 is fitted in these vehicles: Honda Accord 9th generation (2012-2019).

Below are the models that Honda specifies for this unit:

• Honda Accord 9th generation (2012-2019)

Compare the part number on the label of the removed unit with this page beforehand. This only confirms that it is the right unit. Nevertheless, have the fault memory read out, because only the 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-A030-M4 work?

First have the fault memory read out and attach the log. Then disconnect the battery before you remove the control unit. Next, create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit is first examined on the test bench. Defective components are replaced by the team, the stored crash data is erased and a function test concludes the repair. 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-T2A-A030-M4 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. The return after the repair is also made by UPS.

The printed repair order goes into the parcel. Pack the unit so that it withstands knocks.