Airbag control unit with part number 77960-TBA-A040-M2

What does the airbag control unit 77960-TBA-A040-M2 do?

The airbag control unit 77960-TBA-A040-M2 is the central control unit of the restraint system (SRS) for Honda. It evaluates the signals from the crash sensors and decides in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered.

It also monitors the entire system continuously. If it detects a fault, it reports this via the airbag warning light in the instrument cluster.

After an accident, the unit stores crash data and then locks itself. This function is part of the design of the control unit and runs without any action by the driver.

Why does the control unit 77960-TBA-A040-M2 fail?

The most common cause of the control unit 77960-TBA-A040-M2 is crash data stored after an accident, even if no airbag was triggered. A normal diagnostic tool cannot erase this data. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

An entry in the memory can therefore remain even though the vehicle appears to run normally after the event.

Airbag24 erases the crash data during the repair. Which of the other causes is present is established only by the test on the test bench.

How can you tell that the 77960-TBA-A040-M2 is defective?

On the 77960-TBA-A040-M2, a defect shows up as the airbag warning light in the instrument cluster staying on permanently or only intermittently. In addition, a fault message may appear in the instrument cluster, or the diagnostic tool may get no connection to the control unit. In an emergency, airbags and seatbelt pretensioners may then not trigger.

The warning light is the signal with which the system itself indicates a fault. Do not ignore it, even if the vehicle seems to behave normally.

A fault memory that cannot be cleared shows that the fault is still present. Have it read out before taking any further steps.

Which vehicles is the 77960-TBA-A040-M2 fitted in?

The 77960-TBA-A040-M2 is fitted in this vehicle: Honda Civic 10th generation (2015-2022).

The following vehicles are recorded for this part number:

• Honda Civic 10th generation (2015-2022)

Compare the part number on the label of the removed unit with this page, and you will know that it is the correct unit. Whether the control unit itself is defective or whether a plug or cable is the cause is shown only by the fault memory, which you should have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 77960-SMG-G014-M1, 77960-TBA-A01, 77960-TBA-A02, 77960-TBA-A03, 77960-TBA-A04, 77960-TBA-A05.

How does the repair of the 77960-TBA-A040-M2 work?

In the repair of the 77960-TBA-A040-M2, first have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Processing at Airbag24 usually takes 3–4 working days.

Afterwards you create a repair order online and pack the unit well before sending it in. Airbag24 checks it on the test bench, replaces defective components, erases the crash data and carries out a function test. Finally, 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-TBA-A040-M2 get to Airbag24?

You send the control unit 77960-TBA-A040-M2 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

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