Airbag control unit with part number 77960-TR0-B010-M4

What does the airbag control unit 77960-TR0-B010-M4 do?

The airbag control unit 77960-TR0-B010-M4 controls the restraint system (SRS) of Honda. From the values of the crash sensors it calculates in an impact which airbags and seatbelt pretensioners must be triggered, within milliseconds. In normal operation it checks the entire system and shows faults via the airbag warning light.

It runs constantly and checks the connections to sensors and actuators, so that the system is ready in an emergency.

After an accident it stores crash data and then locks itself.

Why does the control unit 77960-TR0-B010-M4 fail?

The most common cause is crash data from an earlier accident, even if no airbag was triggered; a standard diagnostic tool cannot remove it. Added to this are aged components, moisture at plugs, cold solder joints and voltage spikes.

A fault can also occur without an accident. The other causes in detail:

• Electronic components that age over the years
• Cold solder joints on the circuit boards
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery or a jump start

How can you tell that the 77960-TR0-B010-M4 is defective?

Typical signs are an airbag warning light in the instrument cluster that lights up permanently or only intermittently, as well as an error message in the instrument cluster display. The diagnostic tool then finds no connection to the control unit, and the fault memory cannot be erased.

A lit warning light means that airbags and seatbelt pretensioners may not deploy in an emergency. Take this notice seriously and have the cause checked promptly.

The light alone does not show where the fault lies. Only the readout shows whether the control unit is affected or whether a plug or cable is the cause.

Which vehicles is the 77960-TR0-B010-M4 fitted in?

To check whether your vehicle matches this part number, see the list of models. The airbag control unit 77960-TR0-B010-M4 is fitted in these vehicles: Honda Civic 9th generation (2011-2017).

The assignment covers these vehicles:

• Honda Civic 9th generation (2011-2017)

Both are helpful. Compare the part number on the label of the removed unit with this page, since that only confirms you have the right unit. Also have the fault memory read out before removal, because only the 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-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-B010-M4 work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery, remove the control unit only afterwards and create a repair order online before sending 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 the stored crash data and carries out a function test. Afterwards your unit is 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-TR0-B010-M4 get to Airbag24?

The unit is sent in as a parcel. Alternatively, UPS collects it from you for an extra charge, and after the repair Airbag24 sends it back by UPS.

The printed repair order belongs in the parcel. Pad the unit so that it arrives shockproof.