Airbag control unit with part number 77960-T7A-J811-M2

What does the airbag control unit 77960-T7A-J811-M2 do?

The airbag control unit 77960-T7A-J811-M2 is the central control unit of the restraint system (SRS) for Honda. It evaluates the signals from the crash sensors, decides in an accident within milliseconds about triggering airbags and seatbelt pretensioners, and monitors the system continuously. It reports faults via the airbag warning light.

During normal operation the control unit works unobtrusively. It constantly checks the connected components, so that every airbag and every seatbelt pretensioner is available in an accident.

After an accident the unit stores crash data and then locks itself. Only a repair releases this lock.

Why does the control unit 77960-T7A-J811-M2 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot delete it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes from a weak battery or jump-starting.

The crash data keeps the unit in the fault state, even if the electronics show no recognisable damage. It is the main reason why a fault persists after an incident.

The other causes can develop gradually. Contacts that have been exposed to moisture lose quality over time, and voltage spikes can weaken components without causing an immediate failure.

• Aged electronic components
• Cold solder joints
• Moisture and corrosion at plug connectors
• Voltage spikes from a weak battery or jump-starting

How can you tell that the 77960-T7A-J811-M2 is defective?

A defect shows itself through an airbag warning light that stays on permanently or intermittently, an error message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared.

With these signs, airbags and seatbelt pretensioners may not deploy in an emergency. Even a vehicle that otherwise drives completely normally can have such a fault. The warning light should therefore be taken seriously.

The warning light reports the fault immediately. A separate search is not required for this.

Which vehicles is the 77960-T7A-J811-M2 fitted in?

The control unit 77960-T7A-J811-M2 is fitted in these vehicles: Honda HR-V 2nd generation (2015-2022).

The vehicles assigned to the unit are listed here:

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

Check the part number on the label of the removed unit against this page. This only ensures that it is the right unit. Also have the fault memory read out before you remove the unit. Only the log shows whether the control unit is defective or whether a plug or cable is behind the problem.

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-J811-M2 work?

You first read out the fault memory and enclose the log. Then disconnect the battery and only then remove the control unit. Next create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

The order serves safety, because the system must be de-energised during removal. Each step depends on the previous one.

At Airbag24 the unit is examined on the test bench. Defective components are repaired, stored crash data is deleted and a function test is carried out. Afterwards your own unit goes back to you. The 3–4 working days apply only to this check and repair.

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-J811-M2 get to Airbag24?

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

Pack the control unit shockproof and enclose the printed repair order.