Airbag control unit with part number 77960-TY3-L111-M1

What does the airbag control unit 77960-TY3-L111-M1 do?

The airbag control unit 77960-TY3-L111-M1 is the central control unit of the SRS restraint system in Honda. It evaluates the signals from the crash sensors, decides within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

If a fault occurs, the unit reports it via the airbag warning light so that the driver notices the finding immediately. The control unit works independently, without waiting for commands from outside.

Why does the control unit 77960-TY3-L111-M1 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a standard diagnostic reader cannot remove it. In addition, ageing electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes can affect the 77960-TY3-L111-M1.

The data originates from the event itself and remains in the unit.

The other triggers are unremarkable. Over the years components fatigue, solder joints crack open, and water or salt attack the contacts. Even a brief voltage spike can damage the electronics.

How can you tell that the 77960-TY3-L111-M1 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool does not find the control unit, and the fault memory cannot be cleared. In these circumstances the restraint system may possibly not deploy in an emergency.

If you ignore the light, you miss the chance to have the fault checked in good time. The warning light indicates that the system itself has detected a fault.

A fault message and a missing diagnostic connection add to this picture. Together they suggest that something is wrong within the system itself, without the cause being established by this alone.

Which vehicles is the 77960-TY3-L111-M1 fitted in?

The control unit 77960-TY3-L111-M1 is fitted in the following vehicles: Honda Legend 5th generation (2014-2021).

The list contains the vehicles for which this number is recorded:

• Honda Legend 5th generation (2014-2021)

Compare the part number on the label of the removed unit with this page, because that way you can tell whether the correct unit is in front of you. Also have the fault memory read out beforehand. Only this result shows whether the control unit itself is defective or whether a connector or a cable is the cause.

How does the repair of the 77960-TY3-L111-M1 work?

Have the fault memory of the 77960-TY3-L111-M1 read out first; the log goes with the unit. Then disconnect the battery, only then remove the control unit and create a repair order online. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit goes onto the test bench. Defects are rectified, the crash data removed and the system tested. The 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-TY3-L111-M1 get to Airbag24?

You organise the shipment of the 77960-TY3-L111-M1 yourself by parcel, or you book a UPS collection for an extra charge. Returns are likewise made by UPS.

The repair order, which you print beforehand, is enclosed in the parcel, and the unit is packed shock-proof.