Airbag control unit with part number 77960-TEA-T820-M4

What does the airbag control unit 77960-TEA-T820-M4 do?

The airbag control unit 77960-TEA-T820-M4 coordinates the restraint system (SRS) in Honda. It reads the crash sensors and decides in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered.

During operation the unit checks the system and reports faults via the airbag warning light in the instrument cluster.

After an accident it stores crash data and locks itself. This makes it the central point where the entire restraint technology comes together.

Why does the control unit 77960-TEA-T820-M4 fail?

In the case of 77960-TEA-T820-M4, stored crash data after an accident is the most common cause, even if no airbag has deployed. Ageing components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are further causes.

Crash data remains in memory and cannot be removed with an ordinary diagnostic tool. Only the repair at Airbag24 gets rid of it, because the data is erased there.

The other causes concern the electronics and the connections. Voltage spikes, for example from a jump-start or a weak battery, are one example.

How can you tell that the 77960-TEA-T820-M4 is defective?

A defect in the 77960-TEA-T820-M4 becomes visible when the airbag warning light in the instrument cluster lights up permanently or intermittently. A fault message, a missing connection to the diagnostic tool or a fault memory that cannot be cleared also point to a defect.

The warning light shows the defect, and in this state airbags and seatbelt pretensioners may not deploy in an emergency. A prompt check of the system is therefore advisable.

Which vehicles is the 77960-TEA-T820-M4 fitted in?

The 77960-TEA-T820-M4 is fitted in these vehicles: Honda Civic 10th generation (2015-2022).

The following assignment is on file:

• Honda Civic 10th generation (2015-2022)

Compare the part number on the label of the removed unit with this page. This only ensures that it is the correct unit. Have the fault memory read out beforehand, because only this log shows whether the control unit is defective 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-TEA-T820-M4 work?

Have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit 77960-TEA-T820-M4. Create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. The unit then goes back to you.

This order must be observed for safety reasons. 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-T820-M4 get to Airbag24?

You can send the control unit 77960-TEA-T820-M4 as a parcel or have it collected by UPS for an extra charge. Returns after the repair are made by UPS.

The printed repair order goes into the parcel, and the unit should be packed shockproof.