Airbag control unit with part number 77960-T7A-J420-M2

What does the airbag control unit 77960-T7A-J420-M2 do?

The airbag control unit 77960-T7A-J420-M2 coordinates all airbags and seatbelt pretensioners in the restraint system (SRS) of Honda. In an emergency it evaluates the impact signals and triggers the appropriate components within milliseconds. If a fault is detected, the airbag warning light shows it.

Monitoring runs continuously in the background.

After a crash, the unit creates crash data and switches into a locked state.

Why does the control unit 77960-T7A-J420-M2 fail?

The most common cause is crash data from an accident, because it stays stored in the unit even if no airbag has deployed. A normal diagnostic tool cannot erase it. Other possible causes are ageing components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

Ageing electronic components, cold solder joints and moisture are among the other causes, as is corrosion on plug connections.

Voltage spikes, for example from a weak battery or a jump start, can also stress the unit. Airbag24 erases the crash data during the repair; which cause applies only becomes clear during the inspection.

How can you tell that the 77960-T7A-J420-M2 is defective?

A fault in the 77960-T7A-J420-M2 shows mainly through the airbag warning light, fault messages in the instrument cluster, a lack of connection to the diagnostic tool, or a fault memory that cannot be cleared. In that case, airbags and seatbelt pretensioners may not deploy in an emergency.

If the warning light stays on permanently or intermittently, it is a clear sign that you should not ignore. A fault memory that cannot be cleared also points to a finding that needs to be resolved.

Which vehicles is the 77960-T7A-J420-M2 fitted in?

The 77960-T7A-J420-M2 is fitted in these vehicles: Honda HR-V 2nd generation (2015-2022).

The list shows the vehicles recorded for this part number.

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

Comparing the label number of the removed unit with this page ensures that it is the correct unit, nothing more. In addition, have the fault memory read out, because only that 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-T7A-J420-M2 work?

First have the fault memory read out and attach the log. Then disconnect the battery, and only then remove the control unit. Create the repair order online before sending the unit off, well packed. Testing, repairing and checking at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit is inspected, defective components are repaired or replaced, stored crash data is erased and a function test follows. Your own unit is then returned 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-T7A-J420-M2 get to Airbag24?

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

Enclose the printed repair order with the parcel, and pack the unit so that it is shock-resistant.