Airbag control unit with part number 77960-S84-A86-M1

What does the airbag control unit 77960-S84-A86-M1 do?

The airbag control unit 77960-S84-A86-M1 forms the central control unit of the SRS for vehicles of the Honda brand. It checks the crash sensors continuously, decides in a fraction of a second in an accident which airbags and seatbelt pretensioners fire, and reports faults via the airbag warning light.

After an accident the unit stores crash data and locks itself. The lock is lifted only by the repair.

Why does the control unit 77960-S84-A86-M1 fail?

Stored crash data is the most common cause of failure of the 77960-S84-A86-M1, even if no airbag has deployed after the accident. Aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes come on top of this.

A normal diagnostic tool cannot erase the crash data. Airbag24 erases it during the repair.

The other causes work over the course of everyday use: electronics age, solder joints can go cold, moisture attacks contacts, and a weak battery or a jump start creates voltage spikes.

How can you tell that the 77960-S84-A86-M1 is defective?

A defect in the 77960-S84-A86-M1 shows through the airbag warning light, fault messages in the instrument cluster, a missing connection to the diagnostic tool, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

• The airbag warning light lights up permanently or intermittently.
• The instrument cluster shows a fault message.
• The diagnostic tool does not find the control unit.
• The fault memory cannot be cleared.

The light reports the defect as soon as it occurs. Therefore have the system checked promptly and do not ignore the indication.

Which vehicles is the 77960-S84-A86-M1 fitted in?

The control unit 77960-S84-A86-M1 is fitted in these vehicles: Honda Accord 6th generation (1998-2002).

The following overview shows the vehicles known to us for this part number.

• Honda Accord 6th generation (1998-2002)

Compare the part number on the label of the removed unit with this page. This only establishes that you have the correct unit.

Have the fault memory read out as well. Only the result 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-SEA-G815-M1, C0W6K4VDA.

How does the repair of the 77960-S84-A86-M1 work?

First read out the fault memory at the 77960-S84-A86-M1 and enclose the log. Then disconnect the battery, and only after that remove the control unit. Next create a repair order online and send the unit in, well packed. Processing at Airbag24 itself usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components and erases the stored crash data. A function test follows, and then your own unit goes 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-A86-M1 get to Airbag24?

You send the control unit 77960-S84-A86-M1 as a parcel or book a UPS collection for an extra charge. The return after the repair is made by UPS.

Put the printed repair order in the parcel. Pack the unit shock-resistant so that it survives transport undamaged.