Airbag control unit with part number 77960-T73-B110-M4

What does the airbag control unit 77960-T73-B110-M4 do?

The airbag control unit 77960-T73-B110-M4 coordinates the restraint system (SRS) in Honda vehicles. It processes the signals from the crash sensors and determines within milliseconds in an accident which airbags and seatbelt pretensioners are triggered.

In addition it checks the system continuously. Faults it finds are shown via the airbag warning light in the instrument cluster.

After an accident the control unit writes crash data into its memory and locks itself. The lock ends only with the repair.

Why does the control unit 77960-T73-B110-M4 fail?

For the 77960-T73-B110-M4, stored crash data comes first, as it is the most common cause even when no airbag has been triggered. Other possible causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be cleared with a normal diagnostic tool. Airbag24 takes care of this during the repair.

Ageing electronic components and cold solder joints affect the circuit itself. Moisture and corrosion attack the plug connections, while voltage spikes stress the electronics, for example with a weak battery or a jump start.

How can you tell that the 77960-T73-B110-M4 is defective?

A defect on the 77960-T73-B110-M4 becomes visible at the airbag warning light in the instrument cluster, which lights up permanently or intermittently. In addition there are a fault message, no connection to the diagnostic tool, and a fault memory that cannot be cleared.

The airbag warning light in the instrument cluster is the most important indication, because it sits directly in view. If it lights up permanently or only intermittently, the control unit has detected a fault. The diagnostic tool then receives no connection.

Airbags and seatbelt pretensioners may therefore possibly not deploy in an emergency. Such a condition should be clarified promptly.

Which vehicles is the 77960-T73-B110-M4 fitted in?

The 77960-T73-B110-M4 is fitted in these vehicles: Honda HR-V 2nd generation (2015-2022).

The matching vehicles are listed below:

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

Compare the part number on the label of the removed unit with this page. This only confirms that you have the right unit in front of you. Separately from this, have the fault memory read out, because only that 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-B110-M4 work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery, afterwards remove the 77960-T73-B110-M4 and create a repair order online, before the well-packed unit is sent in.

At Airbag24 the control unit is checked on the test bench, defective components are replaced, the stored crash data is cleared and a function test is carried out. Processing takes 3–4 working days as a rule, and this time covers only checking, repairing and testing.

Afterwards 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-B110-M4 get to Airbag24?

You send the 77960-T73-B110-M4 as a parcel or book a UPS collection for an extra charge. Airbag24 sends the unit back to you by UPS after the repair.

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