Airbag control unit with part number 77960-SWA-S212-M1

What does the airbag control unit 77960-SWA-S212-M1 do?

The airbag control unit 77960-SWA-S212-M1 coordinates the restraint system (SRS) in Honda. It processes the readings from the crash sensors, decides in a collision within fractions of a second which airbags and seatbelt pretensioners are triggered, and reports faults via the airbag warning light.

In the background, it continuously checks its own connections and the components connected to it. This means a fault is noticed as soon as it occurs.

After an accident, the control unit writes crash data and locks itself. This data forms the starting point for every later check on the unit.

Why does the control unit 77960-SWA-S212-M1 fail?

Crash data that remains stored in the unit after an accident is the most common cause, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Other causes include aged components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

Crash data is therefore the most obvious reason to start troubleshooting before other causes are checked.

Aged electronics and connection problems can hardly be told apart from the outside. Only reading out the fault memory and testing the unit will show which cause is present.

How can you tell that the 77960-SWA-S212-M1 is defective?

If the airbag warning light in the instrument cluster comes on, either permanently or intermittently, that is a warning sign. A fault message in the instrument cluster, no contact with the diagnostic tool or a fault memory that cannot be emptied also count as signs. In such cases, airbags and seatbelt pretensioners may not trigger in an emergency.

The light is a warning signal, not a cosmetic flaw that can be ignored. It makes the fault visible and calls for an inspection.

Which cause lies behind it remains open at first and only shows up when the fault memory is read out.

Which vehicles is the 77960-SWA-S212-M1 fitted in?

A control unit 77960-SWA-S212-M1 belongs to Honda. It was fitted in these vehicles: Honda CR-V 3 RE (2006-2012).

The assignment of vehicles is shown in this overview:

• Honda CR-V 3 RE (2006-2012)

Compare the part number on the label of the removed unit with this page. This only establishes that it is the correct unit. Have the fault memory read out beforehand, because only the log shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-SWA-G214-M4, 77960-SWA-S21, 77960-SWA-S214-M4, 77960-T0AA-110-M1, 77960-TA0-A031, 77960-TLA-A25.

How does the repair of the 77960-SWA-S212-M1 work?

Processing at Airbag24 usually takes 3–4 working days. Before removal, have the fault memory read out and enclose the log. Then disconnect the battery, remove the control unit and create a repair order online.

Airbag24 checks the unit you sent in, repairs defective components, erases the stored crash data and carries out a function test. After that, 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-SWA-S212-M1 get to Airbag24?

You send the unit in as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back via UPS.

Put the printed repair order in the parcel and pack the unit shock-resistant.