Airbag control unit with part number 77960-T73-H110-M4

What does the airbag control unit 77960-T73-H110-M4 do?

The airbag control unit 77960-T73-H110-M4 is the control unit of the restraint system in Honda vehicles. It processes the signals from the impact sensors, decides within milliseconds in an impact whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The unit detects faults itself and reports them via the airbag warning light in the instrument cluster. It thus forms the switching centre between sensors and ignition.

After an accident, the control unit stores crash data and locks itself.

Why does the control unit 77960-T73-H110-M4 fail?

For the 77960-T73-H110-M4, crash data from an accident is the most common cause; it stays in the memory even if no airbag has been triggered. A normal diagnostic tool cannot delete it; Airbag24 removes it during the repair. Aged components, cold solder joints, moisture and corrosion, and voltage spikes also play a part.

Crash data cannot be seen from the outside, because the control unit itself can look inconspicuous. That is why the search for the cause usually starts with the fault memory.

Aged components and cold solder joints worsen the contact step by step. Moisture at plugs leads to corrosion, and voltage spikes from a weak battery or jump-starting add further strain to the electronics.

How can you tell that the 77960-T73-H110-M4 is defective?

On the 77960-T73-H110-M4, a defect shows itself first through the airbag warning light in the instrument cluster, which stays on permanently or intermittently. Added to this are fault messages in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be cleared.

The warning light is the most important sign, because it shows the state of the system directly. As long as it is active, airbags and seatbelt pretensioners may possibly not trigger in an emergency.

If you notice any of these signs, have the finding checked promptly.

Which vehicles is the 77960-T73-H110-M4 fitted in?

Models of Honda are recorded for this part number. The control unit 77960-T73-H110-M4 is fitted in these vehicles: Honda HR-V 2nd generation (2015-2022).

The following overview lists the vehicles recorded for this part number:

• Honda HR-V 2nd generation (2015-2022)

Compare the part number on the label of the removed unit with this page; this only clarifies whether it is the correct unit. Have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-3V0-A81, 77960-T7S-A21, 77960-T7S-A212-M2, 77960T7SK410M2.

How does the repair of the 77960-T73-H110-M4 work?

You have the fault memory read out and attach the log, then disconnect the battery. Only then do you remove the control unit, and create the repair order online. Next, pack the unit well and send it in. Checking, repairing and testing at Airbag24 usually take 3–4 working days.

The battery must be disconnected before removal. This sequence is part of the safety requirements.

At Airbag24 the unit is checked on the test bench, defective components are replaced, stored crash data is deleted and a functional test follows. Then your own unit 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-T73-H110-M4 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Put the printed repair order into the parcel and pack the unit shockproof.