Airbag control unit with part number 77960-TGH-Q020-M4

What does the airbag control unit 77960-TGH-Q020-M4 do?

Within the restraint system (SRS) of Honda, the airbag control unit 77960-TGH-Q020-M4 forms the central control. It evaluates the data from the crash sensors and determines in an accident within a few milliseconds which airbags and seatbelt pretensioners are triggered. It also monitors the system continuously.

The control unit reports faults via the airbag warning light in the instrument cluster. After an accident it stores crash data and locks itself.

The sensors constantly supply the control unit with new readings, which it evaluates.

Why does the control unit 77960-TGH-Q020-M4 fail?

The most common cause is crash data that remains stored in the unit after an accident, even if no airbag has triggered. A normal diagnostic tool cannot erase it. Other causes are aged components, cold solder joints, moisture, corrosion and voltage spikes.

Airbag24 erases the crash data during the repair.

Voltage spikes occur, for example, with a weak battery or during a jump-start. Moisture and corrosion damage the plug connections, and aged components deteriorate over time.

How can you tell that the 77960-TGH-Q020-M4 is defective?

The airbag warning light in the instrument cluster lights up 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.

With these signs, airbags and seatbelt pretensioners may possibly not trigger in an emergency. The warning is therefore a reason to have the system checked promptly.

Which vehicles is the 77960-TGH-Q020-M4 fitted in?

The control unit 77960-TGH-Q020-M4 is fitted in these vehicles: Honda Civic 10th generation (2015-2022).

The vehicles we have on record for this unit are listed here:

• Honda Civic 10th generation (2015-2022)

Matching the part number on the label of the removed unit with this page only confirms the correct unit. Have the fault memory read beforehand: only this result shows whether the control unit is defective or a connector 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-Q020-M4 work?

You first have the fault memory read and attach the log, then disconnect the battery and only then remove the control unit. At Airbag24, testing, repair and function test usually take 3–4 working days in total.

You then create a repair order online and send in the well-packed unit.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. Afterwards 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-TGH-Q020-M4 get to Airbag24?

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

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