Airbag control unit with part number 77960-TWA-A410-M4

What does the airbag control unit 77960-TWA-A410-M4 do?

The airbag control unit 77960-TWA-A410-M4 coordinates the restraint system (SRS) of Honda. It processes signals from the crash sensors and decides in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered. It also monitors the system continuously.

Faults are reported via the airbag warning light in the instrument cluster. After an accident, it stores crash data and locks itself.

Why does the control unit 77960-TWA-A410-M4 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. For the control unit 77960-TWA-A410-M4, Airbag24 erases this data during the repair; a normal diagnostic tool cannot do this. Other causes include ageing components, moisture and corrosion at plug connections.

Over time, electronic components age, and cold solder joints can form in some places.

Moisture and corrosion attack the contacts at plug connections and disturb the signal. Voltage spikes, such as from a weak battery or a jump start, place additional stress on the electronics.

How can you tell that the 77960-TWA-A410-M4 is defective?

A defect in the 77960-TWA-A410-M4 shows up as the airbag warning light staying on constantly or intermittently. In addition there is a fault message in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be erased.

In an emergency, airbags and seatbelt pretensioners may not trigger if the control unit is faulty. The warning comes from the control unit itself, so it must not be ignored.

Which vehicles is the 77960-TWA-A410-M4 fitted in?

Check the list before removal to see whether your vehicle is affected. The control unit 77960-TWA-A410-M4 is fitted in these vehicles: Honda Accord 10th generation (2017-2024).

This overview shows the vehicles in which the unit is listed:

• Honda Accord 10th generation (2017-2024)

Compare the label of the removed unit with this page. That only clarifies whether you have the right unit. Have the fault memory read out beforehand, because only the result shows whether the control unit 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-TWA-A410-M4 work?

First have the fault memory read out, enclose the log, disconnect the battery and only then remove the control unit 77960-TWA-A410-M4. Create the repair order online and send in the unit well packed. At Airbag24, processing usually takes 3–4 working days.

Airbag24 tests the unit on the test bench, replaces defective components, erases the crash data and carries out a function test. Your own unit then comes back to you.

Safety comes first, so the unit is removed only after the battery has been disconnected.

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-TWA-A410-M4 get to Airbag24?

Your route to Airbag24 is either by parcel or by a UPS collection that you book for an extra charge. After the repair, Airbag24 returns the control unit 77960-TWA-A410-M4 by UPS.

Pack the unit shock-proof and enclose the printed repair order.