Airbag control unit with part number 77960-TEA-P820-M4

What does the airbag control unit 77960-TEA-P820-M4 do?

The airbag control unit 77960-TEA-P820-M4 manages the restraint system (SRS) of Honda. It takes readings from the crash sensors and decides within milliseconds in a crash which airbags and seatbelt pretensioners are triggered; it also checks the system during operation.

If it detects a fault, it indicates this via the airbag warning light in the instrument cluster. After an accident it stores crash data and then locks itself.

The checking runs quietly in the background.

Why does the control unit 77960-TEA-P820-M4 fail?

With the 77960-TEA-P820-M4, the most common cause is stored crash data from an accident, even if no airbag was triggered. Further causes come from the electronics and the plug connectors.

Crash data remains in the memory until Airbag24 erases it during the repair. A standard diagnostic tool cannot remove it.

Electronic components age, and cold solder joints can cause contact problems. Moisture and corrosion at plug connectors are also among the causes.

Voltage spikes, for example from a weak battery or a jump start, place additional strain on the control unit.

How can you tell that the 77960-TEA-P820-M4 is defective?

The airbag warning light in the instrument cluster is the most important warning sign on the 77960-TEA-P820-M4, because it stays on permanently or intermittently as soon as a fault is present. A fault message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared occur together with it.

In this state, airbags and seatbelt pretensioners may fail to trigger in an emergency.

The warning light therefore deserves attention, and a check should not be postponed to a later routine appointment.

Which vehicles is the 77960-TEA-P820-M4 fitted in?

The model assignment for the part number 77960-TEA-P820-M4 decides whether the unit fits. The control unit 77960-TEA-P820-M4 is fitted in these vehicles: Honda Civic 10th generation (2015-2022).

In detail:

• 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 the right unit in front of you. You should also have the fault memory read out before anything is removed, because it 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-TEA-P820-M4 work?

First have the fault memory of the 77960-TEA-P820-M4 read out and attach the log. Processing at Airbag24 usually takes 3–4 working days, and that covers only checking, repairing and testing.

Then disconnect the battery before you remove the control unit. Next, create the repair order online and pack the unit well for sending.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data and carries out a function test. Afterwards the 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-P820-M4 get to Airbag24?

You send the 77960-TEA-P820-M4 either as a parcel or book a UPS collection for an extra charge. After the repair the unit is returned to you via UPS.

The printed repair order goes in the parcel, and the unit must be packed shock-resistant.