Airbag control unit with part number 77960-T70-B110-M2

What does the airbag control unit 77960-T70-B110-M2 do?

The restraint system (SRS) in Honda is evaluated by the airbag control unit 77960-T70-B110-M2. The crash sensors supply it with the data from which it decides within milliseconds which airbags and seatbelt pretensioners fire. It monitors the system continuously and reports faults via the airbag warning light.

This monitoring works throughout normal driving. After an accident the unit stores crash data and remains locked afterwards.

Why does the control unit 77960-T70-B110-M2 fail?

Most often the cause lies in stored crash data, even if no airbag was triggered; a normal diagnostic tool cannot remove this data. Additional causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

A failure can have several causes at once, so the cause is clear only after an inspection.

Crash data stays in the unit until it is processed. Gradual causes such as ageing or corrosion slowly change the unit.

How can you tell that the 77960-T70-B110-M2 is defective?

Signs include the airbag warning light, which lights up intermittently or permanently, an error message in the instrument cluster, a diagnostic tool that cannot establish a connection, and a fault memory that cannot be cleared.

The signs in detail:

• Airbag warning light on permanently or intermittently
• Error message in the instrument cluster
• No connection between the diagnostic tool and the control unit
• Fault memory that cannot be cleared

Such findings belong in an inspection promptly. In an emergency, airbags and seatbelt pretensioners may possibly not deploy as a result.

Which vehicles is the 77960-T70-B110-M2 fitted in?

At Honda, this control unit is found only in selected models. The control unit 77960-T70-B110-M2 is fitted in these vehicles: Honda HR-V 2nd generation (2015-2022).

The affected models are shown in the overview:

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

Compare the part number on the label of the removed unit with this page to make sure you have the correct unit. Having the fault memory read out is the next step, because it shows whether the control unit 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-T70-B110-M2 work?

Before removal, have the fault memory read out and attach the log. Only then disconnect the battery and take out the control unit; then create a repair order online and send in the unit well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 first examines the unit on the test bench, then defective components are repaired. Stored crash data is removed before a function test releases the unit for return.

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-T70-B110-M2 get to Airbag24?

You either send the unit in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back via UPS.

The printed repair order is enclosed in the parcel. Pack the control unit so that it withstands vibrations.