Airbag control unit with part number 77960-T2A-P810-M4

What does the airbag control unit 77960-T2A-P810-M4 do?

The airbag control unit 77960-T2A-P810-M4 forms the central control unit of the restraint system (SRS) for Honda. It processes the signals from the crash sensors and decides within milliseconds in a crash which airbags and seatbelt pretensioners to trigger.

In addition, it monitors all components of the system and reports faults via the airbag warning light.

After an accident the unit stores crash data and locks itself. The next section explains the role the crash data plays.

Why does the control unit 77960-T2A-P810-M4 fail?

Most often the cause is crash data stored after an accident, even if no airbag has deployed. This cannot be cleared with an ordinary diagnostic tool. Other possible causes are ageing electronics, cold solder joints, moisture, corrosion at plug connections and voltage spikes.

The crash data stays stored regardless of whether an airbag has deployed. It remains in the memory until the repair removes it.

The other causes affect the electronics and their contacts. Solder joints can go cold, components age, and moisture attacks plug connections.

Voltage spikes, for example with a weak battery or when starting with external power, additionally stress the circuit.

How can you tell that the 77960-T2A-P810-M4 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, and an error message appears in the instrument cluster. In addition there is no connection to the diagnostic tool and a fault memory that cannot be cleared.

The light is the signal to pay attention to. As long as it stays on, the airbags and seatbelt pretensioners may not deploy in an emergency.

Have the system checked promptly, even if the vehicle otherwise drives normally.

Which vehicles is the 77960-T2A-P810-M4 fitted in?

The 77960-T2A-P810-M4 is fitted in these vehicles: Honda Accord 9th generation (2012-2019).

The suitable models for this part number are listed here:

• Honda Accord 9th generation (2012-2019)

Hold the part number on the label of the removed unit next to this page. That way you can see whether you have the right unit in front of you. Whether the control unit itself is defective or a plug or cable is the cause only shows the fault memory you read out beforehand.

For the same vehicles, we also repair control units with the part numbers 77960-SEA-G815-M1, 77960-T3L-A012-M1, C0W6K4VDA.

How does the repair of the 77960-T2A-P810-M4 work?

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

At Airbag24 it is examined on the test bench, defective components are replaced where needed, and the crash data is cleared. A function test completes the work. Testing, repairing and checking take 3–4 working days as a rule.

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-T2A-P810-M4 get to Airbag24?

Send the unit in as a parcel or arrange a UPS collection for an extra charge. Airbag24 sends it back to you by UPS after the repair. Pack the control unit shock-resistant and include the printed repair order.

A well-padded carton protects the unit on its way.