Airbag control unit with part number 77960-TBA-X040-M2

What does the airbag control unit 77960-TBA-X040-M2 do?

The control unit 77960-TBA-X040-M2 is the control unit of the SRS restraint system in Honda. It evaluates the crash sensors and determines in an accident within milliseconds which airbags and seatbelt pretensioners are triggered.

It also monitors the system continuously. It indicates faults via the airbag warning light in the instrument cluster.

After an accident the unit stores crash data and locks itself. Only the repair lifts the lock.

Why does the control unit 77960-TBA-X040-M2 fail?

Most often the cause is stored crash data, even if no airbag was triggered in the accident. They cannot be erased with an ordinary diagnostic tool.

At Airbag24 the crash data is erased during the repair. In addition, ageing electronic components, cold solder joints, moisture and corrosion at plug connections, or voltage spikes such as those from a weak battery or a jump start can cause the failure.

How can you tell that the 77960-TBA-X040-M2 is defective?

The airbag warning light in the instrument cluster comes on permanently or intermittently if there is a defect on the 77960-TBA-X040-M2. A fault message, a diagnostic tool without contact and a fault memory that cannot be cleared may appear alongside.

If the restraint system is disturbed, airbags and seatbelt pretensioners may fail to trigger in a crash. This risk justifies a prompt check, even if the vehicle otherwise appears unremarkable. Take the warning light seriously.

Which vehicles is the 77960-TBA-X040-M2 fitted in?

The control unit 77960-TBA-X040-M2 is fitted in these vehicles: Honda Civic 10th generation (2015-2022).

Here you will find the vehicles that are recorded with this unit in our information:

• Honda Civic 10th generation (2015-2022)

Before the unit is removed, the fault memory should be read out. Only then is it clear whether the control unit itself is defective or whether a plug or a cable is the cause. The comparison of the part number on the label follows afterwards.

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-X040-M2 work?

Before removal you read out the fault memory, disconnect the battery, remove the unit and create a repair order online. Processing at Airbag24 usually takes 3–4 working days.

Attach the record to the unit, pack it carefully and then send it in.

Airbag24 checks the control unit on the test bench, repairs defective components, erases the crash data and carries out a functional test. 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-TBA-X040-M2 get to Airbag24?

You send the control unit 77960-TBA-X040-M2 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 into the parcel and pack the unit so that it is shock-resistant.