Airbag control unit with part number 77960-TGN-G220-M4

What does the airbag control unit 77960-TGN-G220-M4 do?

The unit is the central control unit of the restraint system in Honda: it checks the sensors continuously, calculates in an emergency which airbags and seatbelt pretensioners are triggered, and reports faults to the airbag warning light. After an accident, the 77960-TGN-G220-M4 stores crash data and locks itself.

The decision to trigger is made within milliseconds, long before a person could react. This speed is the reason the evaluation runs entirely within the unit itself.

In daily use the control unit goes unnoticed as long as everything is in order. Only a fault makes it visible, and that can then happen via the light or a message on the display.

Why does the control unit 77960-TGN-G220-M4 fail?

The largest share is made up of crash data stored after an accident, even if no airbag has deployed, because a normal diagnostic tool does not erase it. On the 77960-TGN-G220-M4, aged electronics, cold solder joints, moisture and corrosion at connectors, and voltage spikes can also be considered as causes.

Crash data stays in the memory, even when the accident was minor and no airbag was triggered.

Further causes lie in age, the environment or the vehicle electrical system:

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

How can you tell that the 77960-TGN-G220-M4 is defective?

The airbag warning light in the instrument cluster lights up continuously or flickers intermittently, accompanied by a fault message. In addition, the diagnostic tool cannot establish a connection to the 77960-TGN-G220-M4, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The light is the vehicle's direct indication of a problem in the restraint system. Do not ignore this warning, because this is how the fault can be narrowed down early. Have the system checked promptly.

Which vehicles is the 77960-TGN-G220-M4 fitted in?

The 77960-TGN-G220-M4 is fitted in these vehicles: Honda Civic 10th generation (2015-2022).

For this control unit we have recorded the matching models as follows:

• Honda Civic 10th generation (2015-2022)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the correct unit and says nothing about whether it is defective. Therefore have the fault memory read out beforehand, because only the log shows whether the control unit or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-SMG-G014-M1, 77960-TBA-A01, 77960-TBA-A02, 77960-TBA-A03, 77960-TBA-A04, 77960-TBA-A05.

How does the repair of the 77960-TGN-G220-M4 work?

First have the fault memory read out and attach the log. Only then disconnect the battery and remove the 77960-TGN-G220-M4. After that, create a repair order online and send in the well-packed unit. At Airbag24, testing, repair and function check should be allowed for 3–4 working days as a rule.

The order is fixed for safety reasons. Only once the readout is complete and the battery is disconnected do you work on the unit.

At the test bench at Airbag24, the control unit is dealt with first. Defective components are then replaced, the crash data is removed and a function test is carried out. After that, 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-TGN-G220-M4 get to Airbag24?

The 77960-TGN-G220-M4 goes to Airbag24 as a parcel, or you commission UPS collection for an extra charge. The return after the repair is likewise made by UPS.

Enclose the printed repair order with the parcel. Pack the control unit shockproof.