Airbag control unit with part number 77960-TR0-F414-M1

What does the airbag control unit 77960-TR0-F414-M1 do?

The airbag control unit 77960-TR0-F414-M1 is the central control unit of the restraint system (SRS) for Honda. It evaluates the signals from the crash sensors, decides within a fraction of a second in an accident which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. If it detects a fault, it indicates this via the airbag warning light.

During operation the unit checks the connections to sensors, airbags and seatbelt pretensioners without interruption. It records irregularities in the fault memory so that a workshop can trace them in a targeted way.

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

Why does the control unit 77960-TR0-F414-M1 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered; a normal diagnostic tool cannot erase it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

Crash data remain in the memory until they are erased. This also applies to accidents without a triggered airbag, and an ordinary diagnostic tool cannot remove them.

Aged components and cold solder joints lead to faults that only appear intermittently and are therefore hard to pin down.

Moisture and corrosion at plug connections impair the contact. Voltage spikes additionally stress the circuit.

How can you tell that the 77960-TR0-F414-M1 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears. Furthermore, the diagnostic tool cannot establish a connection to the control unit, or the fault memory cannot be erased. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The warning light is the clearest warning sign of the system. It indicates a detected fault even when hardly anything noticeable occurs in everyday driving.

If the light flickers only at times, have the fault memory read out anyway. The entry remains stored even when the indicator goes out again.

Which vehicles is the 77960-TR0-F414-M1 fitted in?

The control unit 77960-TR0-F414-M1 is fitted in these vehicles: Honda Civic 9th generation (2011-2017).

The list shows the vehicles for which the unit is listed:

• Honda Civic 9th generation (2011-2017)

Compare the part number on the label of the removed unit with this page, so that you can be sure you have the right unit in front of you. Also have the fault memory read out, because only the result 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-TS4-U411-M1, 77960-TS4-U811-M2, 77960-TS4-Z611-M1, 77960-TS6-H711-M1, 77960-TT0-T011-M1, 77960-TT0-Y610-M2.

How does the repair of the 77960-TR0-F414-M1 work?

First have the fault memory read out and enclose the log. Then disconnect the battery, remove the control unit, create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days; during this time Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test.

The order is for your safety. Only once the battery is disconnected is the control unit removed.

After the function test your own unit goes back to you. The stated time applies exclusively to the work at Airbag24.

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-TR0-F414-M1 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends it back to you by UPS.

Put the printed repair order into the parcel and pack the control unit shock-proof.