Airbag control unit with part number 77960-S84-A83-M3

What does the airbag control unit 77960-S84-A83-M3 do?

The airbag control unit 77960-S84-A83-M3 controls the restraint system (SRS) of Honda. It evaluates the signals from the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and reports faults via the airbag warning light.

The unit monitors the entire system continuously, even when the vehicle is simply standing still. After an accident it stores crash data and then locks itself.

In everyday use the electronics remain invisible. You only notice them when the warning light in the instrument cluster shows something.

Why does the control unit 77960-S84-A83-M3 fail?

For the airbag control unit 77960-S84-A83-M3, the most common cause is crash data stored after an accident, even if no airbag has triggered. A normal diagnostic tool cannot erase it. Further causes are aged electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

Crash data stays in the control unit even if the vehicle drives normally again afterwards. It cannot be removed with usual tools; Airbag24 erases it during the repair.

The other causes tend to act over time: electronic components age, solder joints lose their firmness, and moisture or rust settle on plug connectors. Voltage spikes, for example from a weak battery or a jump start, also put additional strain on the unit.

How can you tell that the 77960-S84-A83-M3 is defective?

On the 77960-S84-A83-M3, a defect shows through the airbag warning light in the instrument cluster, which lights up permanently or intermittently; through fault messages in the instrument cluster; through the diagnostic tool having no connection to the control unit; and through a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

Typical signs are:

• The airbag warning light in the instrument cluster stays on permanently or lights up intermittently.
• A fault message on the airbag system appears in the instrument cluster.
• The diagnostic tool cannot establish a connection to the control unit.
• The fault memory cannot be cleared.

The warning light indicates the fault. It is a signal from the control unit itself and not a minor matter that can be ignored.

Which vehicles is the 77960-S84-A83-M3 fitted in?

The airbag control unit 77960-S84-A83-M3 is fitted in these vehicles: Honda Accord 6th generation (1998-2002).

The assigned vehicles are listed here:

• Honda Accord 6th generation (1998-2002)

Comparing the part number on the label of the removed unit with this page only ensures that you have the right unit. Have the fault memory read out beforehand: only this result shows whether the control unit is defective or whether a plug or cable is causing the problem.

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-A83-M3 work?

For the 77960-S84-A83-M3, first read out the fault memory and enclose the log, then disconnect the battery and only then remove the control unit; afterwards create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench and replaces defective components where necessary. Afterwards the stored crash data is erased and a functional test shows whether the unit works correctly again. Then your own unit is 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-A83-M3 get to Airbag24?

You send the 77960-S84-A83-M3 in as a parcel or book a UPS collection for an extra charge; after the repair, Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.