Airbag control unit with part number 77960-TS4-U411-M1

What does the airbag control unit 77960-TS4-U411-M1 do?

The airbag control unit 77960-TS4-U411-M1 is the control unit of the restraint system (SRS) in the vehicle from Honda. It processes the signals from the crash sensors, decides on deployment within milliseconds in an accident and controls the system during operation. Faults are reported via the airbag warning light. After an accident the unit stores crash data and locks itself.

The sensors are spread throughout the vehicle, and their measured values arrive at the control unit. Only there is it decided which airbags and seatbelt pretensioners become active.

The system checks itself continuously. This allows it to detect deviations that could later develop into a failure.

Why does the control unit 77960-TS4-U411-M1 fail?

The most frequent trigger is stored crash data after an accident, even without an airbag having deployed. A normal diagnostic tool cannot delete this data, and that is exactly what keeps the fault going.

Aged electronic components also play a role. Over time, solder joints can go cold, which leads to intermittent connections.

Moisture and corrosion at plug connections, as well as voltage spikes from the vehicle electrical system, are likewise among the possible causes. Airbag24 deletes the crash data as part of the repair and checks the remaining points on the unit.

How can you tell that the 77960-TS4-U411-M1 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, possibly together with a fault message. In addition, the diagnostic tool cannot reach the control unit, and the fault memory cannot be cleared. In this case, airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light is the most conspicuous signal. It can appear only briefly after starting and then go out again, which is still worth checking.

The fault memory does not always show immediately whether the control unit or the wiring is affected. That is why it is worth looking at the log before you make any decisions.

Which vehicles is the 77960-TS4-U411-M1 fitted in?

The 77960-TS4-U411-M1 is fitted in these vehicles: Honda Civic 9th generation (2011-2017).

The list names the vehicles that Airbag24 assigns to this unit.

• Honda Civic 9th generation (2011-2017)

Have the fault memory read out before you remove the unit. Afterwards compare the part number on the label of the removed control unit with the number you have read off.

For the same vehicles, we also repair control units with the part numbers 77960-S02-A840-M3, 77960-SMG-G120-M1, 77960-TV0-G020-M4.

How does the repair of the 77960-TS4-U411-M1 work?

First you read out the fault memory and enclose the log. Then you disconnect the battery, remove the control unit and create a repair order online. After that, send the well-packed unit in.

Take care when removing the unit that the plug connections do not break. A properly packed unit arrives safely at Airbag24.

Airbag24 checks the control unit on the test bench, repairs defective components, deletes the stored crash data and carries out a function test. For checking, repairing and testing, Airbag24 generally needs 3–4 working days. Your own unit then 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-TS4-U411-M1 get to Airbag24?

Either you send the control unit 77960-TS4-U411-M1 to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair the unit is sent back to you by UPS.

The printed repair order goes into the parcel. Pack the unit shock-proof so that it stays undamaged.