Airbag control unit with part number 77960-TVA-H030-M4

What does the airbag control unit 77960-TVA-H030-M4 do?

The airbag control unit 77960-TVA-H030-M4 controls the restraint system (SRS) of Honda. In an impact, it evaluates the crash sensors and determines within a fraction of a second which airbags and seatbelt pretensioners are triggered.

During normal operation, the unit checks all connected components continuously. If something fails, it indicates this via the airbag warning light.

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

Why does the control unit 77960-TVA-H030-M4 fail?

Stored crash data is the most common cause, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Other causes are aged components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Electronics age, and solder joints can go cold over time. Moisture attacks plug connections until the contacts corrode, which can disturb signal transmission.

Voltage spikes occur, for example, when the battery is weak or the vehicle is started with a jump-start.

How can you tell that the 77960-TVA-H030-M4 is defective?

A defect first shows up as the airbag warning light, which lights up permanently or only intermittently. In addition there are fault messages in the instrument cluster, no connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared.

Typical signs at a glance:

• Airbag warning light lights up permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

In the event of such a defect, the airbags and seatbelt pretensioners may fail to deploy in an emergency. Take every warning light seriously and have the system checked promptly.

Which vehicles is the 77960-TVA-H030-M4 fitted in?

The airbag control unit 77960-TVA-H030-M4 is fitted in these vehicles: Honda Accord 10th generation (2017-2024). To check whether it also works in your car, use the label on the removed unit and the fault memory.

The vehicles recorded for this part number are shown in the list here.

• Honda Accord 10th generation (2017-2024)

First compare the part number on the label with this page. This only establishes that it is the right unit. Then have the fault memory read out, because the log shows whether the control unit itself is the cause or whether a plug or cable is affected.

For the same vehicles, we also repair control units with the part numbers 77960-T3L-A012-M1, 77960-T3L-C012-M4, 77960-T3L-C020-M4, 77960-T3L-C030-M4, 77960-T3L-F012-M4, 77960-T3L-F020-M4.

How does the repair of the 77960-TVA-H030-M4 work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery and only afterwards remove the control unit. Create the repair order online and send the unit in; Airbag24 needs 3–4 working days as a rule for the check, repair and function test.

At Airbag24, the unit is examined on the test bench. Defective components are repaired, stored crash data is removed and a function test is carried out before your own unit comes 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-TVA-H030-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 handled by UPS.

Include the printed repair order with the unit, and pack it shockproof.