Airbag control unit with part number 77960-T73-B310-M4

What does the airbag control unit 77960-T73-B310-M4 do?

The airbag control unit 77960-T73-B310-M4 controls the restraint system (SRS) in vehicles of the make Honda. It evaluates the crash sensors, decides within milliseconds in a crash whether airbags and seatbelt pretensioners are triggered, and keeps the system under control.

It shows detected faults via the airbag warning light. After a crash it writes crash data and locks itself.

Why does the control unit 77960-T73-B310-M4 fail?

The most common cause is crash data stored in the unit after an accident, even without an airbag deployment. A standard diagnostic tool does not erase it. Other causes are ageing, moisture, weak contacts and voltage spikes.

Only a repair removes such entries.

• Ageing of the components
• soldered joints with contact problems
• moisture and rust on connectors
• voltage spikes caused by battery problems or jump-starting

How can you tell that the 77960-T73-B310-M4 is defective?

The airbag warning light glows permanently or intermittently as soon as the system reports something. The diagnostic tool then cannot address the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may not deploy.

• Airbag system warning light is on
• Fault message in the instrument cluster
• Diagnostic tool cannot reach the control unit
• Fault memory remains

A readout is the only way to establish where the fault lies.

Which vehicles is the 77960-T73-B310-M4 fitted in?

The details refer to exactly this number. The control unit 77960-T73-B310-M4 was fitted by Honda in these vehicles: Honda HR-V 2nd generation (2015-2022).

The assigned vehicles are shown in this list:

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

The label on the removed unit gives the number, which you compare with this page. That confirms you have the right unit. Having the fault memory read out comes before all further steps, because only the log shows whether the control unit itself is defective or a plug or cable is.

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-B310-M4 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. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit comes to the test bench. Defective components are replaced, stored crash data is erased, and the functional test comes last. Afterwards your own unit goes back to you.

In the vehicle the sequence is not negotiable, because it serves safety.

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-B310-M4 get to Airbag24?

You can send in the control unit 77960-T73-B310-M4 as a parcel, or UPS will collect it for an extra charge. Airbag24 sends your own unit back to you by UPS after the repair.

The printed repair order and shock-proof protection for the unit go into the parcel.