Airbag control unit with part number 77960-S84-A72-M2

What does the airbag control unit 77960-S84-A72-M2 do?

The airbag control unit 77960-S84-A72-M2 is the central control unit of the restraint system of Honda. It receives the reports from the crash sensors, decides in an accident which airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The unit shows faults in the system via the airbag warning light. After an accident it stores crash data and locks itself. Only the repair lifts the lock.

Because the system must react without hesitation in an emergency, the electronics remain on standby at all times.

Why does the control unit 77960-S84-A72-M2 fail?

The most common cause for the 77960-S84-A72-M2 is crash data from an accident, even if no airbag deployed; a normal diagnostic tool cannot delete it. In addition, there are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

The crash data is stored in the control unit itself and is independent of whether the airbags triggered. That is why this point is relevant even when no airbag has fired.

Aged components lose reliability over the years. Cold solder joints can lose contact, and moisture with corrosion damages the plug connections. Voltage spikes, for example from a jump start or a weak battery, can place additional stress on the electronics.

How can you tell that the 77960-S84-A72-M2 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently when there is a defect on the 77960-S84-A72-M2. Accompanying this, a fault message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In that case airbags and seatbelt pretensioners may not trigger in an emergency.

The warning light reports the fault itself and is therefore the most reliable sign the vehicle offers. It does not light up without reason.

A diagnostic tool that makes no contact points to a fault in the control unit or in its connection. A check will establish where exactly the fault lies.

Which vehicles is the 77960-S84-A72-M2 fitted in?

The following information is based on the part number. The control unit 77960-S84-A72-M2 is fitted in the following vehicles: Honda Accord 6th generation (1998-2002).

The assignment in detail:

• Honda Accord 6th generation (1998-2002)

Comparing the part number with the label on the removed unit only confirms that it is the right unit. Whether the control unit is defective, or whether a plug or cable is the cause, is shown only by the fault memory, which must be read out before removal.

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-A72-M2 work?

First have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit 77960-S84-A72-M2. Afterwards create a repair order online and pack the unit well before sending it. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench and replaces defective components. Stored crash data is deleted, and a function test concludes the work. Only then does your own unit go back 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-A72-M2 get to Airbag24?

You can send the control unit 77960-S84-A72-M2 as a parcel, or book a UPS collection for an extra charge. Airbag24 sends it back to you by UPS after the repair.

Put the printed repair order into the parcel. Pack the unit shock-proof so that it survives the journey undamaged.