Airbag control unit with part number 77960-T70-H020-M1

What does the airbag control unit 77960-T70-H020-M1 do?

The airbag control unit 77960-T70-H020-M1 is the central control unit of the restraint system (SRS) for Honda. It evaluates the crash sensors and decides in a crash, within milliseconds, which airbags and seatbelt pretensioners are triggered. The system is monitored continuously and faults are shown via the airbag warning light.

While driving, the control unit checks whether the connected components deliver plausible values. An outlier is recorded in the fault memory.

After an accident the control unit stores crash data and locks itself. This happens within the unit itself.

Why does the control unit 77960-T70-H020-M1 fail?

Start with the stored crash data, because it is the most common cause: it remains after an accident, even when no airbag has triggered, and a normal diagnostic tool cannot erase it. Further causes are aged electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

That crash data is stored in the unit is not visible from the vehicle. A diagnostic tool can reach it, but it cannot eliminate it.

The other causes develop over time. Electronic components age, solder joints give way with temperature changes, and moisture or corrosion weaken the contact at plug connectors.

How can you tell that the 77960-T70-H020-M1 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

The airbag warning light is the clearest sign. It shows that the restraint system has detected a fault, and it must not be ignored.

The fault message in the instrument cluster describes the finding but not the cause. Only the fault memory shows whether the control unit is affected.

Which vehicles is the 77960-T70-H020-M1 fitted in?

The 77960-T70-H020-M1 is fitted in these vehicles: Honda HR-V 2nd generation (2015-2022).

The following list shows the vehicles for which this part number is stored at Airbag24.

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

Compare the part number on the label of the removed unit with this page. That only confirms that you have the correct unit. Also have the fault memory read out beforehand, because the log 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-T70-H020-M1 work?

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

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Then the unit goes back to you.

Those steps take priority because they protect your safety. The 3–4 working days relate only to 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-H020-M1 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

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