Airbag control unit with part number 77960-TGH-J020-M2

What does the airbag control unit 77960-TGH-J020-M2 do?

The airbag control unit 77960-TGH-J020-M2 controls the restraint system (SRS) of Honda. It evaluates the signals from the crash sensors and decides within milliseconds in a crash which airbags and seatbelt pretensioners are triggered. After an accident it stores crash data and locks itself.

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

If the control unit fails, the restraint system may not work reliably in an emergency, even if the airbags and seatbelt pretensioners are themselves intact.

Why does the control unit 77960-TGH-J020-M2 fail?

Most often the cause is crash data stored after an accident, even when no airbag has deployed; a normal diagnostic tool cannot erase it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The other causes at a glance:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or jump-starting

Which of these is present in your unit is determined only by the investigation.

How can you tell that the 77960-TGH-J020-M2 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently. In addition, a fault message appears in the instrument cluster, the diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared.

These signs occur individually or together. In an emergency, airbags and seatbelt pretensioners may then fail to deploy, so the warning must be taken seriously.

The warning light therefore indicates the defect. Please have the restraint system checked promptly, even if the vehicle can still be driven normally.

Which vehicles is the 77960-TGH-J020-M2 fitted in?

The control unit 77960-TGH-J020-M2 is fitted in these vehicles: Honda Civic 10th generation (2015-2022).

You can find the assignment by vehicle here:

• Honda Civic 10th generation (2015-2022)

On the one hand, compare the part number on the label of the removed unit with this page. That only ensures that it is the right unit. On the other hand, have the fault memory read out beforehand, because only that shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-3A2-A810-M2, 77960-3A2-A820-M2, 77960-3A2-A830-M2, 77960-TBA-A01, 77960-TBA-A02, 77960-TBA-A03.

How does the repair of the 77960-TGH-J020-M2 work?

First have the fault memory read out and attach the log, then disconnect the battery and only afterwards remove the control unit. Then create a repair order online and send the unit in well packed. The processing at Airbag24 usually takes 3–4 working days.

Airbag24 tests the unit on the test bench, replaces only the defective components, and erases stored crash data. A function test follows, and your own unit is returned to you.

This time applies only to testing, repairing and function testing at Airbag24. 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-TGH-J020-M2 get to Airbag24?

You can send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Place the printed repair order in the parcel and pack the unit shock-proof.