Airbag control unit with part number 77960-T7S-D810-M2

What does the airbag control unit 77960-T7S-D810-M2 do?

The control unit 77960-T7S-D810-M2 is the switching centre of the airbag system in Honda. It checks the signals from the crash sensors and in an accident decides whether the airbags and seatbelt pretensioners are triggered.

During normal operation the diagnosis runs in the background without interruption. The unit writes any faults it finds to the fault memory and shows them via the airbag warning light in the instrument cluster.

If an accident has occurred, the unit secures the crash data and locks itself. Only a repair lifts the lock.

Why does the control unit 77960-T7S-D810-M2 fail?

The most common cause is crash data that has remained in the unit after an accident, even if the airbag did not fire. Units also fail because of ageing electronic components, cold solder joints, moisture and corrosion on plugs, and voltage spikes.

Crash data cannot be removed with an ordinary diagnostic tool. Airbag24 erases it during the repair, before the unit is returned.

Ageing components and cold solder joints are typical weak points of electronic assemblies, because connections change over time.

Moisture and corrosion at the plug connectors impair contact. Voltage spikes arise, for example, from a weak battery or when a jump start is connected.

How can you tell that the 77960-T7S-D810-M2 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears, the diagnostic tool gets no contact with the control unit, and the fault memory cannot be cleared.

This warning light tells you directly about the fault. While it is lit, airbags and seatbelt pretensioners may not deploy in an emergency.

A check is therefore sensible in the near future, even if the car can still be driven normally day to day.

Which vehicles is the 77960-T7S-D810-M2 fitted in?

The 77960-T7S-D810-M2 can be assigned to these vehicles: Honda HR-V 2nd generation (2015-2022).

The assignment in detail is shown in this list:

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

If the part number on the label matches this page, you have the correct unit. This comparison says nothing about its condition.

Have the fault memory read out before you remove the unit. Only the result shows whether the control unit is defective or whether a plug or cable is causing the failure.

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-T7S-D810-M2 work?

First have the fault memory read out and attach the log. Then disconnect the battery, remove the control unit and create the repair order online. Pack the unit well and send it in. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit is examined on the test bench, defective components are repaired, crash data is erased and a functional test is carried out.

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-T7S-D810-M2 get to Airbag24?

The unit reaches Airbag24 either as a parcel that you send yourself, or via a UPS collection booked for an extra charge. The return is made by UPS.

Pack the unit shock-proof and place the printed repair order in the parcel.