Airbag control unit with part number 77960-T7S-M810-M2

What does the airbag control unit 77960-T7S-M810-M2 do?

The airbag control unit 77960-T7S-M810-M2 is the control unit of the restraint system (SRS) for Honda. It evaluates the signals from the crash sensors and, in the event of an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered. It also checks the system continuously and reports faults via the airbag warning light.

The control runs constantly in the background and compares sensor values with target values. In this way the system stays ready for an emergency.

After an accident the unit stores crash data and locks itself. This function is part of the design of the system.

Why does the control unit 77960-T7S-M810-M2 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Other possible causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be removed with an ordinary diagnostic tool. At Airbag24 it is erased during the repair, so the unit works without these entries afterwards.

The other faults concern the electronics and their connections. Solder joints can age, moisture attacks the contacts, and voltage spikes, for example from a weak battery, put strain on the circuit.

How can you tell that the 77960-T7S-M810-M2 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. In addition, a diagnostic tool cannot connect to the control unit, and the fault memory cannot be cleared.

Such signs point to a fault in the restraint system. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

A prompt check will bring clarity.

Which vehicles is the 77960-T7S-M810-M2 fitted in?

The 77960-T7S-M810-M2 is fitted in these vehicles: Honda HR-V 2nd generation (2015-2022).

The following list shows the vehicles to which this part number is assigned:

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

Comparing the part number on the label of the removed unit with this page only confirms the identity of the unit. Whether the control unit itself is defective, or a plug or cable is causing the fault, only becomes clear once the fault memory has been read out before removal.

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-M810-M2 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the 77960-T7S-M810-M2. Next, create a repair order online; at Airbag24, checking, repairing and testing usually take 3–4 working days.

Pack the unit carefully and send it in. Airbag24 examines it on the test bench, repairs defective components, erases the stored crash data and carries out a function test. Afterwards your own unit is returned to you.

The sequence must be observed for safety reasons.

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-M810-M2 get to Airbag24?

You send the unit as a parcel or, for an extra charge, book a UPS collection. Put the printed repair order into the parcel and pack the unit shockproof.

After the repair, UPS delivers the unit back to you.