Airbag control unit with part number 77960-T73-H220-M4

What does the airbag control unit 77960-T73-H220-M4 do?

The airbag control unit 77960-T73-H220-M4 is the central control unit of the restraint system in the Honda. It processes the signals from the crash sensors, decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and monitors the system at all times.

It reports faults via the airbag warning light. After an accident it secures crash data and locks itself.

Why does the control unit 77960-T73-H220-M4 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered; it cannot be erased with a normal diagnostic tool. Other possible causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Crash data is created even when an accident did not trigger the airbags. The unit keeps it, and a normal diagnostic tool cannot reach it.

Aged electronic components and cold solder joints lead to contact problems that occur irregularly.

Moisture and corrosion on the plugs impair the contact. Voltage spikes, for example from a weak battery or jump-starting, put stress on the electronics.

How can you tell that the 77960-T73-H220-M4 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently, an error message appears, or the diagnostic tool finds no connection to the control unit. Added to this is a fault memory that cannot be cleared; in a crash, the airbags and seatbelt pretensioners may then fail to trigger.

The warning light is the clearest indication, because the system itself shows that it has detected a fault. It is worth checking it after switching on the ignition.

If only the connection to the diagnostic tool is missing, the cause does not necessarily lie in the control unit. Connectors and cables can also be responsible.

Which vehicles is the 77960-T73-H220-M4 fitted in?

The control unit 77960-T73-H220-M4 is fitted in these vehicles: Honda HR-V 2nd generation (2015-2022).

The following models are on record 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 to be sure you have the right unit. Also have the fault memory read out beforehand, because only the result shows whether the control unit itself or a connector 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-H220-M4 work?

First have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit; next, create a repair order online and send in the well-packed unit. At Airbag24, checking, repairing and testing usually takes 3–4 working days.

The sequence protects those working on the system, which is why the control unit is only removed after the battery has been disconnected.

At Airbag24 the unit is checked, defective components are replaced, crash data is erased and a function test is carried out. Afterwards you receive your own unit back.

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-H220-M4 get to Airbag24?

You send the control unit 77960-T73-H220-M4 in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.