Airbag control unit with part number 77960-T7S-W410-M2

What does the airbag control unit 77960-T7S-W410-M2 do?

The control unit 77960-T7S-W410-M2 coordinates the restraint system (SRS) of Honda. In a crash it processes the signals from the crash sensors and decides which airbags and seatbelt pretensioners trigger. At the same time it monitors the system and shows faults via the airbag warning light.

The evaluation happens in a moment for which there is no time to ask back. That is why the unit processes the data independently.

After an accident the control unit stores crash data and locks itself. This process is part of the system's design.

Why does the control unit 77960-T7S-W410-M2 fail?

The most common cause with the 77960-T7S-W410-M2 is crash data stored after an accident, even if no airbag fired; a normal diagnostic tool cannot delete it. Further causes are aged components, cold solder joints, moisture and corrosion at plugs, and voltage spikes from the vehicle electrical system.

Crash data stays in the memory, regardless of whether the airbag actually triggered. The fault memory shows these entries, but a diagnostic tool cannot remove them.

Electronic components age over time, and cold solder joints lead to unstable contacts.

Moisture and corrosion at the plug connections disturb the connection between unit and vehicle. Voltage spikes, for example with a weak battery or jump starting, add further strain to the unit.

How can you tell that the 77960-T7S-W410-M2 is defective?

A defect on the 77960-T7S-W410-M2 shows itself through the airbag warning light in the instrument cluster when it stays on permanently or intermittently. Added to this are an error message, a missing connection to the diagnostic tool and a fault memory that cannot be cleared.

• Airbag warning light stays on permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

As long as these signs exist, airbags and seatbelt pretensioners may possibly not trigger in an emergency. Therefore have the system checked promptly.

Which vehicles is the 77960-T7S-W410-M2 fitted in?

The control unit 77960-T7S-W410-M2 is fitted in these vehicles: Honda HR-V 2nd generation (2015-2022).

This list names the vehicles for this part number:

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

If the part number on the label matches this page, you have the right unit. That does not clarify whether it is defective, though. For that, have the fault memory read out beforehand, because the log shows whether the control unit or a connector or cable is affected.

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-T7S-W410-M2 work?

First have the fault memory read out, then disconnect the battery and only then remove the control unit. Online you create the repair order and send in the unit. At Airbag24 processing of the 77960-T7S-W410-M2 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, removes the stored crash data and carries out a function test. Afterwards your own 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-T7S-W410-M2 get to Airbag24?

You send the 77960-T7S-W410-M2 as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends the unit back to you by UPS. The printed repair order goes into the parcel, and the unit is packed shock-proof.

A sturdy box with enough padding protects the unit from damage in transit.