Airbag control unit with part number 77960-SZW-N410-M3

What does the airbag control unit 77960-SZW-N410-M3 do?

The control unit 77960-SZW-N410-M3 is the switching centre of the airbag system in Honda. It processes what the crash sensors report and determines within milliseconds which airbags and seatbelt pretensioners are triggered. It also monitors all components of the restraint system and reports faults to the airbag warning light.

After an accident the unit writes crash data into its memory and locks itself. You can think of this data as a log that stays in the control unit.

Why does the control unit 77960-SZW-N410-M3 fail?

Stored crash data is the most common cause, even if no airbag has fired. It cannot be deleted with a normal diagnostic tool. Aged electronics, cold solder joints, moisture and corrosion, as well as voltage spikes, also play a role.

That an accident without a deployed airbag still leaves traces in the control unit surprises many keepers and drivers. Nothing about the vehicle reveals this.

Aged components and cold solder joints impair the function gradually. Moisture and corrosion attack the plug connections in particular.

Voltage spikes, on the other hand, occur suddenly, for example with a weak battery or when a jump start is connected, and can likewise cause damage.

How can you tell that the 77960-SZW-N410-M3 is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which stays on permanently or intermittently, and through an error message in the instrument cluster. The diagnostic tool then finds no connection, and the fault memory cannot be emptied. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The light is a direct signal from the system. Therefore do not wait to see whether it goes out on its own.

A fault memory that cannot be emptied suggests that the problem lies deeper than a brief malfunction. Have the finding checked.

Which vehicles is the 77960-SZW-N410-M3 fitted in?

The airbag control unit 77960-SZW-N410-M3 is found in these vehicles: Honda Stepwgn 3rd generation (2005-2009).

The overview names the vehicles to which this unit is assigned.

• Honda Stepwgn 3rd generation (2005-2009)

Comparing the part number on the label of the removed unit with this page only confirms that you have the correct unit. Have the fault memory read out beforehand as well. Only then does it become clear whether the control unit is defective or whether a plug or cable is the cause.

How does the repair of the 77960-SZW-N410-M3 work?

First have the fault memory read out and enclose the log. Then disconnect the battery, remove the control unit 77960-SZW-N410-M3 and create a repair order online. Processing at Airbag24 generally takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, deletes the crash data and carries out a function test. Only after that does your own unit go back to you.

The order of the steps is binding for safety reasons. Deviations are not provided for.

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-SZW-N410-M3 get to Airbag24?

You send the control unit 77960-SZW-N410-M3 as a parcel or book a UPS collection for an extra charge. The return after the repair is made by UPS.

The printed repair order belongs in the parcel, and the unit must be packed shock-resistant.