Airbag control unit with part number 77960-TVA-A460-M4

What does the airbag control unit 77960-TVA-A460-M4 do?

The airbag control unit 77960-TVA-A460-M4 is the central control unit of the restraint system for Honda. It processes the signals from the impact sensors, decides within fractions of a second in an accident on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously.

Faults are shown via the airbag warning light in the instrument cluster.

After an accident the control unit stores crash data and locks itself. This behaviour is part of the design.

Why does the control unit 77960-TVA-A460-M4 fail?

The most common cause is crash data that remains stored after an accident, even if no airbag has deployed; it cannot be removed with a normal diagnostic tool. Also possible are ageing electronics, cold solder joints with poor contact, moisture or corrosion at plugs, and voltage spikes from the vehicle's onboard voltage.

A failure caused by crash data does not show externally on the unit. That is why a look at the fault memory is worthwhile before you look for other causes.

The remaining causes tend to develop step by step. Ageing and moisture act over time, while voltage spikes can come without warning.

How can you tell that the 77960-TVA-A460-M4 is defective?

The airbag warning light in the instrument cluster stays on continuously or intermittently, an error message appears, the diagnostic tool receives no connection to the control unit, or the fault memory cannot be cleared. In these cases the airbags and seatbelt pretensioners may possibly not deploy in an emergency.

Typical indications at a glance:

• warning light in the instrument cluster, continuously or intermittently
• error message in the instrument cluster
• no connection to the diagnostic tool
• fault memory that cannot be cleared

Take such a sign seriously and have it checked promptly.

Which vehicles is the 77960-TVA-A460-M4 fitted in?

The 77960-TVA-A460-M4 is fitted in these vehicles: Honda Accord 10th generation (2017-2024).

The overview shows which vehicles Airbag24 has assigned to this part number.

• Honda Accord 10th generation (2017-2024)

Compare the number on the label of the removed unit with this page; this only confirms that it is the right unit. Also have the fault memory read out before removal, because only this result shows whether the control unit is defective or a plug or cable is the cause.

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-A460-M4 work?

First have the fault memory read out and attach the log. Then disconnect the battery, and only then remove the control unit. Next create a repair order online and send the well-packed unit in. At Airbag24, testing, repair and function test usually take 3–4 working days.

The order is meant for your safety and should be followed exactly as described.

Airbag24 checks the unit on the test bench, repairs defective components, deletes stored crash data and tests the function. Afterwards your 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-TVA-A460-M4 get to Airbag24?

You send the control unit as a parcel to Airbag24 or book a UPS collection for an extra charge. After the repair the unit returns by UPS. The printed repair order goes into the parcel, and the unit must be packed shockproof.

A sturdy box with padding ensures that nothing in the parcel shifts.