Airbag control unit with part number 77960-T7S-G120-M2

What does the airbag control unit 77960-T7S-G120-M2 do?

The airbag control unit 77960-T7S-G120-M2 is the central control unit of the restraint system (SRS) for Honda. It evaluates the signals from the crash sensors, decides within milliseconds in a crash which airbags and seatbelt pretensioners trigger, and monitors the system continuously.

The evaluation runs in the background while the vehicle is in operation. If the system detects a fault, it shows it via the airbag warning light in the instrument cluster. Monitored are, among other things, sensors, wiring and the activation of the trigger circuits.

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

Why does the control unit 77960-T7S-G120-M2 fail?

The most common cause is crash data stored from an accident, even if no airbag has triggered; a normal diagnostic tool cannot delete it. Other causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes, for example from a weak battery or a jump start.

The crash data remain stored in the unit, and a usual diagnostic tool does not remove them. Airbag24 deletes them during the repair.

The other causes concern the electronics themselves. Components age, solder joints can remain cold, and moisture or corrosion affect plug connections. Voltage spikes also stress the circuit, for example when starting with external power.

How can you tell that the 77960-T7S-G120-M2 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. In addition, the diagnostic tool cannot reach the 77960-T7S-G120-M2, and the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may possibly not trigger. The light is therefore a signal you should follow up promptly.

Have the fault memory read out before taking further steps. Only the result shows what the cause is.

Which vehicles is the 77960-T7S-G120-M2 fitted in?

The control unit 77960-T7S-G120-M2 is fitted in these vehicles: Honda HR-V 2nd generation (2015-2022).

The overview shows the vehicles for which this part number is recorded with us.

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

Compare the part number on the label of the removed unit with this page. That only ensures it is the correct unit. Also have the fault memory read out beforehand, because it 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-T7S-G120-M2 work?

First read out the fault memory and enclose the log, then disconnect the battery. Only after that remove the control unit, create the repair order online and send in the unit well packed.

Airbag24 checks the unit on the test bench, replaces defective components, deletes stored crash data and carries out a function test. Afterwards the unit goes back to you.

Testing, repairing and function testing at Airbag24 usually take 3–4 working days. 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-T7S-G120-M2 get to Airbag24?

You send the control unit 77960-T7S-G120-M2 as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends it back by UPS.

Enclose the printed repair order and pack the unit shock-resistant.