Airbag control unit with part number 77960-TVA-X330-M4

What does the airbag control unit 77960-TVA-X330-M4 do?

The airbag control unit 77960-TVA-X330-M4 is the control unit of the SRS system of Honda. It processes the signals from the crash sensors, selects the appropriate airbags and seatbelt pretensioners within milliseconds, and monitors the entire system. After an accident, it stores crash data and locks itself.

The airbag warning light in the instrument cluster reports faults directly. The unit runs in the background during the entire journey and checks itself as it does so.

Why does the control unit 77960-TVA-X330-M4 fail?

Stored crash data after an accident is the most common cause, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other possible causes are aged components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes. Airbag24 erases the crash data during the repair.

The fault search can therefore begin in the memory of the control unit itself. The diagnostic tool finds the entries but cannot erase them.

The other causes concern the electronics: components age, solder joints can go cold, and moisture damages contacts in plug connectors. Voltage spikes arise, for example, from a weak battery or after a jump start.

How can you tell that the 77960-TVA-X330-M4 is defective?

A defect shows when the airbag warning light lights up permanently or intermittently, an error message appears in the instrument cluster, the diagnostic tool cannot establish a connection, or the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then not be able to deploy in an emergency.

The warning light is the most important sign, because it reports the fault directly as soon as the system detects it. If it stays on permanently, have the fault memory read out promptly.

If there is no connection to the diagnostic tool, the control unit itself cannot be reached; this also deserves attention.

Which vehicles is the 77960-TVA-X330-M4 fitted in?

The airbag control unit 77960-TVA-X330-M4 is fitted in these vehicles: Honda Accord 10th generation (2017-2024). What counts is the control unit with exactly this number, not a device that merely looks similar.

The overview of the vehicles follows in this form:

• Honda Accord 10th generation (2017-2024)

Comparing the part number on the label of the removed unit with this page makes sure you have the right unit in front of you. Having the fault memory read out beforehand shows, by contrast, whether the control unit is defective or whether a plug or a 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-X330-M4 work?

First have the fault memory read out and enclose the log, then disconnect the battery. Only then remove the control unit and create a repair order online, before you send the unit in, well packed. Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test.

Processing at Airbag24 usually takes 3–4 working days. After that, 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-TVA-X330-M4 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it via UPS. Enclose the printed repair order in the parcel and pack the control unit shockproof.

A sturdy box with filling material keeps the electronics safe during transport.