Airbag control unit with part number 77960-TEA-N820-M4

What does the airbag control unit 77960-TEA-N820-M4 do?

The airbag control unit 77960-TEA-N820-M4 coordinates the restraint system (SRS) of Honda. It processes the measured values from the sensors, decides in an impact which airbags and seatbelt pretensioners fire, and keeps the system under observation during operation.

If a fault occurs, the unit reports it to the airbag warning light. The decision in an accident has to be made in fractions of a second, which is why the electronics work quickly and without detours.

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

Why does the control unit 77960-TEA-N820-M4 fail?

The most common cause is crash data stored after an accident, even if no airbag has triggered. A standard diagnostic tool cannot erase it. Other causes are:

The crash data remains stored, even though the accident may have been minor. This shows that the electronics also record events that were hardly noticeable in everyday use.

• 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 applies is only decided by the inspection of the unit.

How can you tell that the 77960-TEA-N820-M4 is defective?

The airbag warning light in the instrument cluster stays on or lights up intermittently, error messages appear in the instrument cluster, the diagnostic tool cannot reach the control unit and the fault memory persists.

• warning light permanently or intermittently on
• error message in the instrument cluster
• no connection to the control unit via the diagnostic tool
• fault memory cannot be cleared

Airbags and seatbelt pretensioners may possibly fail to trigger in an emergency as long as the fault persists. Therefore get such a sign checked promptly.

Which vehicles is the 77960-TEA-N820-M4 fitted in?

The 77960-TEA-N820-M4 is fitted in these vehicles: Honda Civic 10th generation (2015-2022).

The following vehicles are stored for this unit:

• Honda Civic 10th generation (2015-2022)

Compare the part number on the label of the removed unit with this page, then you know you have the correct unit. It does not explain the cause, though. For that, have the fault memory read out before you remove anything, because only the log shows whether the control unit itself is defective or whether a plug or cable is affected.

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-TEA-N820-M4 work?

Have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Create a repair order online and send in the unit, packed well.

Processing at Airbag24 usually takes 3–4 working days, before 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-TEA-N820-M4 get to Airbag24?

Either you send the unit as a parcel, or you book a UPS collection for an extra charge. The return after the repair is made by UPS.

Enclose the printed repair order in the parcel, and the unit must be packed shock-proof.