Airbag control unit with part number 77960-THR-A120-M2

What does the airbag control unit 77960-THR-A120-M2 do?

In the vehicle, the airbag control unit 77960-THR-A120-M2 triggers the restraint system (SRS) for Honda. It processes the measured values of the crash sensors and decides within milliseconds in an accident on airbags and seatbelt pretensioners.

The system is under constant monitoring. If a fault occurs, it appears via the airbag warning light in the instrument cluster.

After an accident the control unit creates crash data and locks itself. The following explains what this means for the repair.

Why does the control unit 77960-THR-A120-M2 fail?

The most common cause is crash data that remain in the memory after an accident, even without airbags triggered. They cannot be removed with a standard diagnostic tool. Other causes include aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from jump starting or a weak battery.

The entry survives the vehicle standing still, because a standard diagnostic tool cannot remove it.

As for the electronics themselves: components age, solder joints can go cold, and moisture acts on the plug contacts. Which cause applies in an individual case is shown only by the inspection.

How can you tell that the 77960-THR-A120-M2 is defective?

If the airbag warning light in the instrument cluster is on, this indicates a defect in control unit 77960-THR-A120-M2, whether constant or intermittent. Also a fault message in the instrument cluster, a missing contact with the diagnostic tool or a fault memory that cannot be erased count among the signs.

As long as the warning is active, it cannot be said with certainty that airbags and seatbelt pretensioners will trigger in an emergency. A defect is therefore no reason to wait.

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

Which vehicles is the 77960-THR-A120-M2 fitted in?

The control unit 77960-THR-A120-M2 appears in our allocations for these vehicles: Honda Odyssey 5th generation (from 2013).

Directly below follows the list of vehicles.

• Honda Odyssey 5th generation (from 2013)

A comparison of the part number on the label of your removed unit with this page gives certainty about the right unit, nothing more. Have the fault memory read before removal, because only this result shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-THR-A02, 77960-THR-A03, 77960-TK8-A011-M1, 77960-TK8-D01.

How does the repair of the 77960-THR-A120-M2 work?

The process starts with the fault memory, which you have read and whose log you enclose. Then disconnect the battery, remove control unit 77960-THR-A120-M2 and create a repair order online, with which you send in the well-packed unit. Inspection, repair and testing at Airbag24 generally take 3–4 working days, during which defective components are replaced, stored crash data erased and the unit inspected.

The order of the steps serves safety.

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-THR-A120-M2 get to Airbag24?

You send control unit 77960-THR-A120-M2 as a parcel or have it collected by UPS for an extra charge. It comes back to you after the repair, likewise by UPS.

Place the printed repair order in the parcel and pack the unit shock-proof.