Airbag control unit with part number 77960-TVA-P020-M4

What does the airbag control unit 77960-TVA-P020-M4 do?

The airbag control unit 77960-TVA-P020-M4 is the control unit of the restraint system (SRS) of Honda. It evaluates the signals from the crash sensors and decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered. It reports faults via the airbag warning light.

While driving, the unit monitors the entire system. It checks sensors, cables and activation elements continuously for plausibility and keeps the installation in view.

After an accident the unit stores crash data and locks itself.

Why does the control unit 77960-TVA-P020-M4 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Other causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Crash data cannot be erased with an ordinary diagnostic tool. At Airbag24 it is deleted as part of the repair.

The further causes at a glance:

• aged electronic components
• cold solder joints
• moisture and corrosion on plug connections
• voltage spikes, for example from a weak battery or jump start

How can you tell that the 77960-TVA-P020-M4 is defective?

The airbag warning light lights up permanently or intermittently. A fault message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

These signs are the visible indications of a defect:

• Airbag warning light permanently on
• Airbag warning light on intermittently
• Fault message in the instrument cluster
• No connection to the diagnostic tool
• Fault memory cannot be cleared

With such signs, airbags and seatbelt pretensioners may not trigger in an emergency. Therefore have the fault memory read out instead of ignoring the warning.

Which vehicles is the 77960-TVA-P020-M4 fitted in?

The control unit 77960-TVA-P020-M4 is fitted in these vehicles: Honda Accord 10th generation (2017-2024).

Here is the list of vehicles stored for this unit:

• Honda Accord 10th generation (2017-2024)

Before sending it in, a few steps make sense. Comparing the part number on the label of the removed unit with this page confirms only that it is the correct unit. Having the fault memory read out, on the other hand, shows whether the control unit itself is defective or whether 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-P020-M4 work?

First have the fault memory read out and attach the log. Then disconnect the battery, remove the control unit and create a repair order online. Then send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, deletes stored crash data and carries out a function test.

Afterwards your own 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-P020-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 to you by UPS.

Put the printed repair order in the parcel and pack the unit shock-proof.