Airbag control unit with part number 77960-TGN-E230-M4

What does the airbag control unit 77960-TGN-E230-M4 do?

The airbag control unit 77960-TGN-E230-M4 evaluates the signals from the crash sensors within the restraint system (SRS) of Honda. In an accident it decides within a few milliseconds which airbags and seatbelt pretensioners are triggered. It monitors the system continuously.

It stores faults and indicates them via the airbag warning light. An accident also causes the unit to store crash data and lock itself.

Why does the control unit 77960-TGN-E230-M4 fail?

Stored crash data is the most common cause with the 77960-TGN-E230-M4, even if no airbag has deployed. Component ageing, cold solder joints, moisture at plug connections and voltage spikes come on top of this.

Stored crash data cannot be cleared with a normal diagnostic tool. Airbag24 erases it during the repair. The other causes concern the electronics themselves: components age, solder joints can be cold, and moisture and corrosion attack the plug connections. Voltage spikes, for example from a weak battery or a jump start, place additional strain on the unit.

How can you tell that the 77960-TGN-E230-M4 is defective?

A defect in the 77960-TGN-E230-M4 shows at the airbag warning light in the instrument cluster, at an error message there, at a missing connection to the diagnostic tool and at a fault memory that cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then not deploy.

The signs in detail:

• Airbag warning light lights up permanently or intermittently
• Error message in the instrument cluster
• No connection between the diagnostic tool and the control unit
• Fault memory cannot be cleared

The warning light is a signal that you should have clarified promptly.

Which vehicles is the 77960-TGN-E230-M4 fitted in?

The 77960-TGN-E230-M4 is fitted in these vehicles: Honda Civic 10th generation (2015-2022).

The assigned vehicles are listed below.

• Honda Civic 10th generation (2015-2022)

Compare the part number on the label of the removed unit with this page. That only confirms that it is the right unit. Have the fault memory read out before removal, because only the result shows whether the control unit is defective or whether a plug or cable is causing the fault.

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-E230-M4 work?

For the 77960-TGN-E230-M4, first have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Create the repair order online, then send in the well-packed unit.

This sequence is mandatory for safety reasons.

At Airbag24 the unit is examined on the test bench. Defective components are replaced, the stored crash data is erased and the function is tested. Processing at Airbag24 usually takes 3–4 working days, after which your own unit is returned. 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-E230-M4 get to Airbag24?

You send the control unit 77960-TGN-E230-M4 in as a parcel, or you can book a UPS collection for an extra charge. Airbag24 sends it back by UPS after the repair.

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