Airbag control unit with part number 77960-TVA-D210-M4

What does the airbag control unit 77960-TVA-D210-M4 do?

The airbag control unit 77960-TVA-D210-M4 is the control centre of the SRS restraint system for Honda. It reads the crash sensors and decides in an accident within milliseconds which airbags and seatbelt pretensioners fire. It checks the state of the system continuously, and faults appear via the airbag warning light.

While driving, the unit stays active. After an accident, it stores crash data and locks itself.

The evaluation requires a stable power supply and intact connections to sensors and triggers.

Why does the control unit 77960-TVA-D210-M4 fail?

The 77960-TVA-D210-M4 most often fails because of stored crash data from an accident, even if no airbag was triggered. Added to this are ageing of the electronics, cold solder joints, moisture as well as corrosion at plug connections, and voltage spikes.

Crash data cannot be deleted with a normal diagnostic tool, so a simple attempt at deletion does not lead to the goal.

Electronic components age, and solder joints can be cold. Moisture and corrosion get into plug connections and disturb the connection.

Voltage spikes from the vehicle electrical system, for example with a weak battery or jump-starting, put additional strain on the circuit.

How can you tell that the 77960-TVA-D210-M4 is defective?

The airbag warning light in the instrument cluster is the clearest sign of a defect in the 77960-TVA-D210-M4. It lights up permanently or intermittently, an error message appears in the instrument cluster, the diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. In that case, airbags and seatbelt pretensioners may not trigger in an emergency.

If the warning light stays on, checking the system is worthwhile.

Only reading out the fault memory shows whether the defect lies in the control unit.

Which vehicles is the 77960-TVA-D210-M4 fitted in?

This control unit is intended for Honda. The 77960-TVA-D210-M4 is fitted in these vehicles: Honda Accord 10th generation (2017-2024).

The following vehicles are stored with us for this part number:

• Honda Accord 10th generation (2017-2024)

Compare the part number on the label of the removed unit with this page; this only ensures that you have the correct unit in front of you. Have the fault memory read out beforehand, because only that shows whether the control unit 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-D210-M4 work?

You have the fault memory read out and attach the log, disconnect the battery and remove the control unit 77960-TVA-D210-M4; only then do you create a repair order online and send in the well-packed unit. Airbag24 checks it on the test bench, repairs defective components, deletes stored crash data and carries out a function test; afterwards your own unit is returned. Processing at Airbag24 usually takes 3–4 working days.

The sequence serves safety and must therefore be observed.

Then the inspection at Airbag24 follows, and only after the function test does the unit go 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-D210-M4 get to Airbag24?

The control unit 77960-TVA-D210-M4 reaches Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair it comes back to you by UPS.

The printed repair order belongs in the parcel. Pack the unit shock-proof.