Airbag control unit with part number 77960-T70-B110-M4

What does the airbag control unit 77960-T70-B110-M4 do?

The airbag control unit 77960-T70-B110-M4 is the central component of the SRS in Honda vehicles. It processes the signals of the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

It reports faults via the airbag warning light in the instrument cluster.

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

Why does the control unit 77960-T70-B110-M4 fail?

The most common cause for the 77960-T70-B110-M4 is crash data stored after an accident, even if no airbag was triggered. Further causes are aged electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

An ordinary diagnostic tool cannot erase crash data. Airbag24 erases it during the repair.

Aged electronic components and cold solder joints can impair function.

Moisture and corrosion on plug connectors lead to poor contact, and voltage spikes, for example from jump-starting or a weak battery, additionally affect the electronics.

How can you tell that the 77960-T70-B110-M4 is defective?

An airbag warning light that stays on permanently or intermittently indicates a defect on the 77960-T70-B110-M4. Added to this are fault messages in the instrument cluster, no connection of the diagnostic tool to the control unit, and a fault memory that cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The fault memory provides the basis for the further check.

Which vehicles is the 77960-T70-B110-M4 fitted in?

The airbag control unit 77960-T70-B110-M4 is installed in these vehicles: Honda HR-V 2nd generation (2015-2022).

The list shows the vehicles for which this part number is recorded.

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

Compare the part number on the label of the removed unit with this page; this makes sure it is the right unit. Have the fault memory read out beforehand, because only the result shows whether the control unit is defective or 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-T70-B110-M4 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit 77960-T70-B110-M4. Then create a repair order online and send the unit in well packed.

At Airbag24 the unit is checked on the test bench, defective components are repaired, crash data is erased and a functional test is carried out. Afterwards you receive your own unit back. Processing usually takes 3–4 working days and covers only this work at Airbag24.

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-M4 get to Airbag24?

You send the control unit 77960-T70-B110-M4 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

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