Airbag control unit with part number 77960-TGG-E020-M4

What does the airbag control unit 77960-TGG-E020-M4 do?

The control unit 77960-TGG-E020-M4 is the airbag control unit of the restraint system (SRS) for Honda. It evaluates the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered.

During operation, it checks the system continuously. If it detects a fault, it displays this via the airbag warning light in the instrument cluster. The light makes the finding visible to you.

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

Why does the control unit 77960-TGG-E020-M4 fail?

Most often the cause is crash data stored after an accident, even without a triggered airbag. Added to this are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

A normal diagnostic tool cannot erase the crash data. Airbag24 erases it during the repair.

The other causes are summarised in the list:

• Aged electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery or jump start

How can you tell that the 77960-TGG-E020-M4 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently. In addition, an error message appears in the instrument cluster, or the diagnostic tool gets no connection to the control unit. If the fault memory also cannot be erased, a defect is likely.

Airbags and seatbelt pretensioners may then not deploy in an emergency. The warning light is therefore a warning signal that you should take seriously.

Which vehicles is the 77960-TGG-E020-M4 fitted in?

The control unit 77960-TGG-E020-M4 is fitted in this vehicle: Honda Civic 10th generation (2015-2022).

The assignment to model and version is shown in the following overview.

• Honda Civic 10th generation (2015-2022)

Compare the part number on the label of the removed unit with this page. This only ensures that you have removed the correct unit. Also have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether 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-TGG-E020-M4 work?

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

Airbag24 checks the control unit on the test bench, repairs defective components, erases the stored crash data and carries out a function 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-TGG-E020-M4 get to Airbag24?

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

The printed repair order goes into the parcel. Pack the control unit shockproof so that it arrives undamaged.