Airbag control unit with part number 77960-TVA-H240-M4

What does the airbag control unit 77960-TVA-H240-M4 do?

In an accident the airbag control unit 77960-TVA-H240-M4 coordinates the airbags and seatbelt pretensioners of Honda vehicles. It evaluates the crash sensors, decides within milliseconds and monitors the system even in normal operation. If it detects a fault, it indicates this via the airbag warning light.

The sensor data converge in the unit, and that is where the triggering decision is made. After an accident it stores crash data and locks itself.

Why does the control unit 77960-TVA-H240-M4 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. An ordinary diagnostic tool cannot erase it; Airbag24 erases it during the repair. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data is stored regardless of whether an airbag was triggered. That is why the question of stored crash data belongs in every check.

The remaining causes concern the electronics and their connections. Electronic components can wear, cold solder joints and moisture at plugs are weak points, and voltage spikes, for example with a weak battery or jump-starting, place additional strain on the electronics.

How can you tell that the 77960-TVA-H240-M4 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool receives no connection to the control unit, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

• airbag warning light on permanently or intermittently
• fault message in the instrument cluster
• no connection to the diagnostic tool
• fault memory cannot be cleared

The warning light is one of the clearest signs, because the system reports that it is faulty. Have a fault checked promptly.

Which vehicles is the 77960-TVA-H240-M4 fitted in?

The control unit 77960-TVA-H240-M4 is fitted in these vehicles: Honda Accord 10th generation (2017-2024).

The vehicles stored for this part number are shown in the following list.

• Honda Accord 10th generation (2017-2024)

Comparing the part number on the label of the removed unit with this page confirms that it is the correct unit. Have the fault memory read out beforehand; only it 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-H240-M4 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Then create a repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench and replaces defective components. Airbag24 then erases the stored crash data, followed by a function test. Processing usually takes 3–4 working days.

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-H240-M4 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Enclose the printed repair order and pack the unit shockproof.