Airbag control unit with part number 77960-T70-B310-M4

What does the airbag control unit 77960-T70-B310-M4 do?

The airbag control unit 77960-T70-B310-M4 is the central control unit of the restraint system (SRS) of Honda. It evaluates the crash sensors, decides in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and reports faults via the airbag warning light.

In the background, the unit checks the entire system continuously, so that it works in an emergency. This includes the sensors, the wiring and the output stages.

After an accident, the control unit stores crash data and locks itself. The lock is lifted only during the repair.

Why does the control unit 77960-T70-B310-M4 fail?

Stored crash data after an accident is the most common cause of the 77960-T70-B310-M4, even if no airbag was triggered. These data cannot be erased with a normal diagnostic tool. Further causes are aged electronics, cold solder joints, moisture and corrosion, as well as voltage spikes.

Airbag24 deletes the crash data during the repair, so you do not have to remove anything yourself. The other causes concern the electronics and the plug connections. Over time, components age, solder joints can go cold, and moisture attacks contacts.

Voltage spikes arise, for example, from a weak battery or a jump-start. Which cause is actually present is shown by the examination on the test bench.

How can you tell that the 77960-T70-B310-M4 is defective?

The airbag warning light in the instrument cluster indicates a defect on the 77960-T70-B310-M4 by lighting up permanently or intermittently. An error message also appears in the instrument cluster, and the diagnostic tool finds no control unit.

If the fault memory also cannot be cleared, that is a further sign. Airbags and seatbelt pretensioners may then fail to trigger in an emergency, which is why the warning light must not be ignored.

Which vehicles is the 77960-T70-B310-M4 fitted in?

The 77960-T70-B310-M4 is fitted in these vehicles: Honda HR-V 2nd generation (2015-2022).

The following list shows the vehicles that are assigned to this control unit.

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

Compare the number on the label of the removed unit with 77960-T70-B310-M4 on this page, to make sure it is the right unit. Also have the fault memory read. Only this log shows whether the control unit is defective or whether a connector 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-B310-M4 work?

First you read out the fault memory and enclose the log. Then you disconnect the battery and only then remove the control unit. Next, you create a repair order online and send the well-packed unit in.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data and carries out a function test. Processing usually takes 3–4 working days. After that, the unit 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-T70-B310-M4 get to Airbag24?

You send the control unit 77960-T70-B310-M4 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-resistant.