Airbag control unit with part number 77960-THR-Y020-M2

What does the airbag control unit 77960-THR-Y020-M2 do?

The airbag control unit 77960-THR-Y020-M2 is the central control unit of the restraint system for Honda. It evaluates the signals from the crash sensors, decides in the event of an accident within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. After an accident it stores crash data and locks itself.

The control unit reports faults in the restraint system via the airbag warning light in the instrument cluster. This way you find out in everyday use when something is wrong in the system.

The crash data record how an accident event proceeded and remain stored in the control unit.

Why does the control unit 77960-THR-Y020-M2 fail?

The most common cause is crash data stored after an accident, even if no airbag has triggered; a normal diagnostic tool cannot erase them. Further causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, as well as voltage spikes, for example from a weak battery or jump-starting.

After an accident the control unit stores crash data, even if no airbag has triggered. A normal diagnostic tool cannot remove these entries, so the fault remains even after the journey.

Aged components, cold solder joints, moisture and corrosion on plug connections are among the further causes. Voltage spikes from the vehicle electrical system, for example when starting with external power, additionally stress the electronics. Such influences can act over a longer period.

How can you tell that the 77960-THR-Y020-M2 is defective?

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

The airbag warning light in the instrument cluster indicates that the system has detected a fault. It lights up permanently or intermittently, and in both cases the vehicle should be checked.

A fault message in the instrument cluster, a diagnostic tool without a connection to the control unit or a fault memory that cannot be cleared are further signs. Taken together, these indications point to a defect in the system.

Which vehicles is the 77960-THR-Y020-M2 fitted in?

The airbag control unit 77960-THR-Y020-M2 is fitted in these vehicles: Honda Odyssey 5th generation (from 2013). The part number only tells you which unit it is, not whether it is defective.

The following list names the vehicles recorded for this part number. Check your vehicle against the list.

• Honda Odyssey 5th generation (from 2013)

Compare the part number on the label of the removed unit with this page. This ensures it is the correct unit. Have the fault memory read out beforehand, 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-THR-A02, 77960-THR-A03, 77960-TK8-A011-M1, 77960-TK8-D01.

How does the repair of the 77960-THR-Y020-M2 work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit. Then create a repair order online and send the unit in well packed. Airbag24 checks it, repairs defective components, erases stored crash data and carries out a function test.

Your first step is the readout, because it documents the state of the system. Then the battery and the removal follow, in this order.

Create the repair order online and pack the unit well for transport.

Airbag24 examines the unit on the test bench and repairs defective components. Stored crash data is erased, then the function test follows. Processing at Airbag24 usually takes 3–4 working days.

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-Y020-M2 get to Airbag24?

You send the control unit as a parcel to Airbag24 or book a UPS collection for an extra charge. After the repair, Airbag24 returns your own unit to you by UPS.

Place the printed repair order in the parcel and pack the control unit shockproof.