Airbag control unit with part number 77960-T73-H310-M4

What does the airbag control unit 77960-T73-H310-M4 do?

As the central control unit of the restraint system (SRS) of Honda, the airbag control unit 77960-T73-H310-M4 is responsible for triggering the airbags and seatbelt pretensioners. The decision is made in an accident within milliseconds, based on the crash sensors.

It also monitors the entire system. Faults appear on the airbag warning light in the instrument cluster.

After an accident, it stores crash data and locks itself.

Why does the control unit 77960-T73-H310-M4 fail?

The most common cause is crash data stored after an accident, even when no airbag was triggered. A normal diagnostic tool cannot delete it. Other causes are aged components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

The crash data remains in the memory until it is specifically removed. As long as it is there, the fault remains visible in the system.

Electronic components age, solder joints can go cold, and moisture or corrosion on plug connections impair the contact.

Voltage spikes arise, for example, from a weak battery or jump-starting.

How can you tell that the 77960-T73-H310-M4 is defective?

A defect shows up on the airbag warning light when it lights up permanently or only intermittently. A fault message appears in the instrument cluster, the diagnostic tool cannot reach the control unit, and a fault memory cannot be cleared.

In this condition, airbags and seatbelt pretensioners may possibly not trigger in an emergency. An inspection of the system is therefore indispensable.

The warning light reports a fault as soon as the system detects it.

Which vehicles is the 77960-T73-H310-M4 fitted in?

This control unit is installed at Honda in the following vehicles: Honda HR-V 2nd generation (2015-2022).

The list is attached here:

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

Before removal, compare the part number on the label with this page. That only ensures it is the right unit. The fault memory must be read out beforehand, because only the result shows whether the control unit is defective or whether a plug or a 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-T73-H310-M4 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. After that, create the repair order online and send the unit in, well packed.

Airbag24 checks the unit on the test bench, replaces defective components, deletes the stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days.

The unit then goes back to you.

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-H310-M4 get to Airbag24?

The unit is sent in as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

The printed repair order is in the parcel. Make sure the packaging is sturdy.