Airbag control unit with part number 77960-SWA-E212-M4

What does the airbag control unit 77960-SWA-E212-M4 do?

The airbag control unit 77960-SWA-E212-M4 forms the control centre of the restraint system in the Honda vehicle. In a crash it evaluates the crash sensors, determines within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the entire system continuously.

The sensor readings are evaluated together, not from a single measured value. This is how the unit decides which airbags suit the situation. Even during normal driving it checks connections and components, and faults appear on the airbag warning light.

If an accident occurs, the unit stores crash data and is locked afterwards.

Why does the control unit 77960-SWA-E212-M4 fail?

On the 77960-SWA-E212-M4, stored crash data from an accident is the most common cause, even if no airbag has deployed. Other causes include ageing components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

This data remains in the unit as long as an ordinary diagnostic tool does not delete it. That is why the fault persists despite reading out the fault memory. Airbag24 clears the crash data during the repair.

Ageing components, cold solder joints and moisture at plug connections act over a long period. Voltage spikes when starting, for example with a weak battery or a jump start, can add further stress. The fault memory shows the specific cause.

How can you tell that the 77960-SWA-E212-M4 is defective?

A defect in the 77960-SWA-E212-M4 shows up as the airbag warning light in the instrument cluster, which lights up permanently or intermittently, as an error message there, as a diagnostic tool with no connection to the control unit, or as a fault memory entry that cannot be cleared.

The airbag warning light in the instrument cluster is the most important signal, because it reports faults in the restraint system immediately. If an error message appears alongside it, the finding is clear. Then have the system checked.

If there is no connection to the control unit, airbags and seatbelt pretensioners may not be able to deploy in an emergency. Please have the finding clarified promptly.

Which vehicles is the 77960-SWA-E212-M4 fitted in?

The airbag control unit 77960-SWA-E212-M4 is fitted in these vehicles: Honda CR-V 3 RE (2006-2012).

The list below shows the vehicles assigned to this part number.

• Honda CR-V 3 RE (2006-2012)

Comparing the part number on the label of the removed unit with this page only confirms that you have the correct unit in front of you. Whether the control unit is defective or a plug or cable is the cause only becomes clear from the fault memory read out beforehand.

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-E212-M4 work?

First have the fault memory of the 77960-SWA-E212-M4 read out and enclose the log, then disconnect the battery and only then remove the control unit. At Airbag24, checking, repairing and testing the 77960-SWA-E212-M4 usually take 3–4 working days.

Then create a repair order online and send the unit in well packed. Airbag24 checks it on the test bench, replaces defective components, clears stored crash data and carries out a function test.

Afterwards 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-E212-M4 get to Airbag24?

You send the control unit 77960-SWA-E212-M4 as a parcel to Airbag24, or book a UPS collection for an extra charge. It is returned by UPS after the repair.

Please place the printed repair order in the parcel, and pack the unit so that it is shock-resistant.