Airbag control unit with part number 77960-T3W-J110-M4

What does the airbag control unit 77960-T3W-J110-M4 do?

The airbag control unit 77960-T3W-J110-M4 is responsible for the SRS restraint system of Honda. In a crash it evaluates the signals from the crash sensors and decides within milliseconds on the triggering of airbags and seatbelt pretensioners.

The unit keeps the entire system under observation and reports detected faults via the airbag warning light in the instrument cluster. In this way you learn of faults.

After an accident it stores crash data and locks itself. You will find the details of this process in the following sections.

Why does the control unit 77960-T3W-J110-M4 fail?

Crash data from an accident is the most common cause, and this applies even where no airbags were triggered; a usual diagnostic tool cannot erase it. Other reasons are aged components, cold solder joints, wetness and corrosion at plugs, and voltage spikes, for example from a jump start or a weak battery.

As long as nobody erases the entry, it remains in the unit. Ordinary diagnostic technology cannot do that.

The electronics themselves wear out over the years, solder joints can go cold, and plug connections react sensitively to moisture. Whether one of these causes applies is determined only by the detailed examination.

How can you tell that the 77960-T3W-J110-M4 is defective?

A defect in control unit 77960-T3W-J110-M4 shows itself mainly through the airbag warning light in the instrument cluster, which lights permanently or flashes intermittently. In addition, an error message in the instrument cluster, a missing contact with the diagnostic tool and a fault memory that cannot be erased are signs.

As long as the light is on, airbags and seatbelt pretensioners may not be able to trigger in an emergency. A prompt check is therefore the right step.

A missing contact with the diagnostic tool does not necessarily point to the control unit alone; a line or a plug can also be the cause.

Which vehicles is the 77960-T3W-J110-M4 fitted in?

For control unit 77960-T3W-J110-M4, our allocation lists the following vehicles: Honda Accord 9th generation (2012-2019).

The following list gives an overview of the vehicles.

• Honda Accord 9th generation (2012-2019)

Comparing the part number on the label of the removed unit with this page only confirms the identity of the unit. Have the fault memory read before removal, because only this log shows whether the control unit itself or a plug or a cable is causing the fault.

For the same vehicles, we also repair control units with the part numbers 77960-T2A-A013-M4, 77960-T2A-A020-M4, 77960-T2A-A021-M4, 77960-T2A-A030-M4, 77960-T2A-D011-M4, 77960-T2A-D020-M4.

How does the repair of the 77960-T3W-J110-M4 work?

Have the fault memory read first and enclose the log, disconnect the battery and only then remove control unit 77960-T3W-J110-M4. Then create the repair order online and send the well-packed unit. Airbag24 generally needs 3–4 working days for inspection, repair and testing; during this time the team inspects the unit on the test bench, replaces defective components, erases stored crash data and carries out a functional test.

The order of the steps is mandatory for safety reasons, which is why removal is planned only after disconnecting the battery.

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-T3W-J110-M4 get to Airbag24?

You dispatch control unit 77960-T3W-J110-M4 as a parcel or use a UPS collection for an extra charge. After the repair, UPS brings your own unit back to you.

Enclose the printed repair order in the parcel, and the unit needs shock-proof packaging.