Airbag control unit with part number 77960-TEA-Y820-M4

What does the airbag control unit 77960-TEA-Y820-M4 do?

The airbag control unit 77960-TEA-Y820-M4 is the control unit of the restraint system in Honda vehicles. It receives the signals from the crash sensors, decides within milliseconds in an accident which airbags and seatbelt pretensioners to trigger, and continuously checks the system.

It indicates detected faults via the airbag warning light. After an accident it stores crash data and locks itself.

The control unit thus combines sensors, ignition and monitoring in one device.

Why does the control unit 77960-TEA-Y820-M4 fail?

In the 77960-TEA-Y820-M4, crash data from a previous accident is the most common cause, even without a triggered airbag; a normal diagnostic tool cannot erase it. In addition, aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes can lead to failure.

Airbag24 removes the crash data during the repair, because a normal diagnostic tool is not capable of doing so.

The remaining causes lie in the component itself or its connections. Electronics age over time, solder joints can go cold, and moisture with corrosion attacks the connections. Voltage spikes, for example from a weak battery or a jump-start, are also possible.

How can you tell that the 77960-TEA-Y820-M4 is defective?

A defect in the 77960-TEA-Y820-M4 shows as the airbag warning light in the instrument cluster staying on permanently or intermittently. It is accompanied by an error message, or the diagnostic tool finds no connection to the control unit.

These indications are typical:

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

While the fault persists, airbags and seatbelt pretensioners may not trigger in an emergency.

Which vehicles is the 77960-TEA-Y820-M4 fitted in?

The control unit 77960-TEA-Y820-M4 is fitted in these vehicles: Honda Civic 10th generation (2015-2022).

The following vehicles are assigned to this part number:

• Honda Civic 10th generation (2015-2022)

Comparing the part number on the label of the removed unit with this page only shows you whether it is the right unit, nothing more. Whether the control unit or a plug or cable is the cause is determined only by the fault memory read out beforehand.

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-Y820-M4 work?

For the 77960-TEA-Y820-M4, first have the fault memory read out and enclose the log; then disconnect the battery and remove the control unit. Afterwards create a repair order online and send in the unit well packed. Airbag24 usually needs 3–4 working days for inspection, repair and testing.

The sequence at the start is mandatory, as it protects safety during removal and shipping.

On the test bench, Airbag24 replaces defective components, erases the crash data and carries out a function test. Your own device is then returned 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-Y820-M4 get to Airbag24?

The 77960-TEA-Y820-M4 can be sent to Airbag24 as a parcel, or a UPS collection for an extra charge can be arranged. After the repair, Airbag24 returns it to you by UPS.

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