Airbag control unit with part number 77960-T7A-G120-M2

What does the airbag control unit 77960-T7A-G120-M2 do?

The airbag control unit 77960-T7A-G120-M2 is the central control unit of the restraint system (SRS) for Honda. It evaluates the crash sensors, decides in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It shows faults via the airbag warning light.

The sensors continuously send the unit values on the vehicle's movement. If it detects an impact that requires a trigger, it activates the appropriate restraint devices.

After an accident, the unit stores crash data and locks itself. This affects the control unit itself.

As long as there is no fault, the system goes unnoticed while driving.

Why does the control unit 77960-T7A-G120-M2 fail?

Crash data is the most common cause, because it remains in memory after an accident, even if no airbag has triggered. A standard diagnostic tool cannot erase it. Other causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Crash data is not a matter of mechanics but of memory. It sits in the unit and causes an error message to appear, even if the electronics still work. Airbag24 removes the data during the repair.

Aged electronic components lose reliability over time. Cold solder joints can interrupt the connection of a component, and moisture or corrosion affect the contacts on the plugs.

Voltage spikes arise, for example, with a weak battery or a jump start. They can also harm the electronics, which is exactly why it is worth having the unit examined.

How can you tell that the 77960-T7A-G120-M2 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, an error message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. With a defect, airbags and seatbelt pretensioners may not trigger in a crash.

The warning light in the instrument cluster shows a fault as soon as the system detects it. Whether it stays on permanently or only now and then is easy to observe.

In addition, an error message may appear in the instrument cluster, the diagnostic tool may fail to connect, or the fault memory may not clear. Taken together, these signs are a clear reason to have the unit checked.

Which vehicles is the 77960-T7A-G120-M2 fitted in?

The control unit 77960-T7A-G120-M2 is fitted for Honda in these vehicles: Honda HR-V 2nd generation (2015-2022).

You can see which vehicles belong to this part number in this overview:

• Honda HR-V 2nd generation (2015-2022)

Compare the part number on the label of the removed unit with this page. This only ensures that it is the right unit. Have the fault memory read out beforehand, because the result 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 77960-3V0-A81, 77960-T7S-A21, 77960-T7S-A212-M2, 77960T7SK410M2.

How does the repair of the 77960-T7A-G120-M2 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Finally, create a repair order online and send in the carefully packed unit.

This sequence is fixed for safety reasons. It applies without exception to all work on the airbag system.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data and carries out a function test. Processing at Airbag24 normally takes 3–4 working days. Afterwards your unit comes 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-T7A-G120-M2 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 control unit shockproof.