Airbag control unit with part number 77960-TVA-H020-M4

What does the airbag control unit 77960-TVA-H020-M4 do?

The airbag control unit 77960-TVA-H020-M4 coordinates the restraint system (SRS) of Honda. It processes the signals from the crash sensors, decides in a crash which airbags and seatbelt pretensioners are triggered, and checks the system continuously.

If it detects a fault, it signals this via the airbag warning light in the instrument cluster. After a crash, it stores crash data and locks itself.

Only fractions of a second remain for the decision in a crash, which is why the unit constantly compares its measured values.

Why does the control unit 77960-TVA-H020-M4 fail?

The most common cause is crash data from an accident, which is stored even if no airbag fires; a normal diagnostic tool cannot erase it. In addition come aged electronics, cold solder joints, moisture and corrosion at plugs, and voltage spikes.

Airbag24 removes the crash data as part of the repair. Aged electronics and cold solder joints affect the circuit itself.

Moisture, corrosion and voltage spikes act instead through plugs and the power supply. Which cause applies in each case is shown only by testing on the test bench.

How can you tell that the 77960-TVA-H020-M4 is defective?

A defect manifests itself through an airbag warning light that lights up in the instrument cluster permanently or intermittently, through an error message in the instrument cluster, through a missing connection to the diagnostic tool, or through a fault memory that cannot be cleared.

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

In such a case, the airbags and seatbelt pretensioners may not deploy in an emergency. The display therefore shows the defect, and a prompt check is the right course.

Which vehicles is the 77960-TVA-H020-M4 fitted in?

The control unit 77960-TVA-H020-M4 is fitted in these vehicles: Honda Accord 10th generation (2017-2024). The part number is the benchmark for the assignment; the model name alone is not sufficient.

The following list shows the vehicles recorded for this part number.

• Honda Accord 10th generation (2017-2024)

Comparing the label number on the removed unit with this page confirms that the unit matches the page. Whether the control unit is defective or a plug or cable causes the fault is shown only by the fault memory read-out. Therefore have it read out before removal.

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-H020-M4 work?

First read out the fault memory and enclose the log. Then disconnect the battery, remove the control unit and create your repair order online, with which the well-packed unit finds its way to us. Checking, repairing and testing at Airbag24 usually takes 3–4 working days.

The unit is checked in-house, defective components are replaced, stored crash data is removed and a function test is carried out. 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-TVA-H020-M4 get to Airbag24?

You can send the control unit as a parcel or book a UPS collection for an extra charge. After repair, Airbag24 returns it to you by UPS.

The printed repair order comes with the parcel. The unit is packed shock-resistant.