Airbag control unit with part number 77960-3D5-A820-M2

What does the airbag control unit 77960-3D5-A820-M2 do?

As an airbag control unit, 77960-3D5-A820-M2 controls the restraint system (SRS) in Honda vehicles. It reads out the crash sensors, decides within a fraction of a second in a crash which airbags and seatbelt pretensioners fire, and monitors the system continuously. It reports faults to the airbag warning light.

In the background, the electronics check whether the connections to sensors, seatbelt pretensioners and airbags are intact, so deviations are spotted early.

After a crash, the unit stores crash data and locks itself.

Why does the control unit 77960-3D5-A820-M2 fail?

Crash data is the most common cause: it is created after an accident, even if no airbag has deployed, and a standard diagnostic tool cannot erase it. Other causes include aged components, cold solder joints, moisture and corrosion on connectors, and voltage spikes, for example from a weak battery or a jump start.

Crash data is erased during the repair at Airbag24, so you do not need to take any steps of your own for it.

The other causes cannot be reliably identified from the outside. Only the check on the test bench shows which component is affected.

How can you tell that the 77960-3D5-A820-M2 is defective?

A fault shows when the airbag warning light in the instrument cluster lights up permanently or intermittently, when an error message appears in the instrument cluster, when the diagnostic tool cannot connect to the control unit, or when the fault memory cannot be cleared. In that case, airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light is the most important signal, because it passes the finding directly to the driver.

If you see any of these indications, do not wait; have the system checked promptly.

Which vehicles is the 77960-3D5-A820-M2 fitted in?

The 77960-3D5-A820-M2 is fitted in these vehicles: Honda CR-V 6 (from 2022). This information refers to exactly this part number.

The vehicles are compiled in a list:

• Honda CR-V 6 (from 2022)

Compare the part number on the label of the removed unit with this page. This only shows you that it is the matching unit. Before removal, you should also have the fault memory read out, because only that result shows whether the control unit itself is defective or whether a connector or cable is the cause.

How does the repair of the 77960-3D5-A820-M2 work?

First have the fault memory read out and enclose the log, then disconnect the battery and then remove the control unit. Online you create the repair order, then pack the unit well and send it in. Airbag24 tests the unit on the test bench, replaces defective components, erases crash data and runs a function test.

The sequence is fixed for safety reasons.

Processing at Airbag24 usually takes 3–4 working days, counting only the testing, repairing and testing carried out there.

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 77960-3D5-A820-M2 get to Airbag24?

You send the control unit 77960-3D5-A820-M2 either yourself as a parcel to Airbag24, or you book a UPS collection for an extra charge. The return after the repair is made by UPS.

Enclose the printed repair order with the parcel; pack the unit shockproof.