Airbag control unit with part number 77960-S84-A74-M2

What does the airbag control unit 77960-S84-A74-M2 do?

The airbag control unit 77960-S84-A74-M2 forms the central control of the restraint system for Honda. It measures the load via the crash sensors, works out in a flash which airbags and seatbelt pretensioners are to be triggered, and monitors the state of the system continuously. After an accident it stores crash data and locks itself.

The unit records faults in the fault memory and reports them via the airbag warning light in the instrument cluster.

Why does the control unit 77960-S84-A74-M2 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered; a normal diagnostic tool cannot remove it. Further causes are aged electronics, cold solder joints, moisture and corrosion at plugs, and voltage spikes from a jump start or a weak battery.

Electronic components are subject to ageing, and contacts can corrode over time. Both can only become noticeable once the system is already faulty.

Voltage spikes arise, for example, from a jump start or when the battery is weakening.

How can you tell that the 77960-S84-A74-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 alongside it. In addition, the diagnostic tool has no connection to the control unit, and the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then be unable to deploy, which is why a check should not be postponed. The light indicates the fault as soon as it occurs.

Which vehicles is the 77960-S84-A74-M2 fitted in?

The control unit 77960-S84-A74-M2 is fitted in this vehicle: Honda Accord 6th generation (1998-2002). Whether your own car is affected is shown by comparing it with the list.

The list below shows the vehicles in which the unit was fitted.

• Honda Accord 6th generation (1998-2002)

Compare the part number on the label of the removed unit with this page. This ensures that you have the correct unit in front of you. Have the fault memory read beforehand, because only that shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-S1A-G81-M1, 77960-S1A-G93-M1, 77960-S1A-G94-M1, 77960-S84-A81-M1, 77960-S84-A83-M3, 77960-S84-A84-M1.

How does the repair of the 77960-S84-A74-M2 work?

First have the fault memory read and attach the log, then disconnect the battery and remove the control unit. Then create a repair order online and send the well-packed unit in. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, deletes stored crash data and runs a function test. Your own, repaired 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-A74-M2 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge, and after the repair Airbag24 returns it by UPS.

Place the printed repair order in the parcel and pack the control unit shockproof.