Airbag control unit with part number 77960-S84-A84-M1

What does the airbag control unit 77960-S84-A84-M1 do?

The airbag control unit 77960-S84-A84-M1 runs the restraint system (SRS) of Honda. It reads the signals from the crash sensors and determines within milliseconds in a collision which airbags and seatbelt pretensioners to trigger.

Outside of an accident, it checks the system continuously. If it detects a fault, it shows this via the airbag warning light in the instrument cluster.

After an accident, the control unit records crash data and locks itself.

Why does the control unit 77960-S84-A84-M1 fail?

Crash data stored after an accident is the most common cause, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other causes include ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from weak batteries or jump-starting.

The crash data remains in the unit until Airbag24 removes it during the repair. For many workshops, this is therefore the starting point of the fault search.

The other causes are more likely to lie in the electronics themselves or in their surroundings. Components age, solder joints can be cold, and plug connections suffer from moisture. Voltage spikes from the vehicle's electrical system are also possible.

How can you tell that the 77960-S84-A84-M1 is defective?

Signs include an airbag warning light in the instrument cluster that lights up permanently or intermittently, a fault message in the instrument cluster, a diagnostic tool with no connection to the control unit, and a fault memory that cannot be cleared.

In such a case, airbags and seatbelt pretensioners may not be able to deploy in an emergency. The warning deserves attention, even if the vehicle otherwise works normally.

The warning light is the most direct information the system gives you. If you heed it, you have a clear pointer for the next steps.

Which vehicles is the 77960-S84-A84-M1 fitted in?

The control unit 77960-S84-A84-M1 is fitted in these vehicles: Honda Accord 6th generation (1998-2002). Confirm whether your car is affected by checking the label on the removed unit.

The vehicles in detail:

• Honda Accord 6th generation (1998-2002)

Compare the part number on the removed control unit with this page. This helps you make sure it is the right unit. Also have the fault memory read out, because only this log shows whether the control unit itself is defective or whether a cable or connector is the cause.

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

How does the repair of the 77960-S84-A84-M1 work?

First have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit. Next, create a repair order online and send the unit in packaging. Checking, repairing and testing at Airbag24 usually takes 3–4 working days.

Pay attention to the sequence, because the control unit may only be removed once the battery has been disconnected.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a functional test. 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-S84-A84-M1 get to Airbag24?

You send the control unit 77960-S84-A84-M1 as a parcel or book a UPS collection for an extra charge. After the repair, it is returned to you by UPS.

Put the printed repair order in the parcel. Pack the unit shock-proof so that it arrives safely.