Airbag control unit with part number 77960-3D4-A910-M2

What does the airbag control unit 77960-3D4-A910-M2 do?

The airbag control unit 77960-3D4-A910-M2 is the central control unit of the restraint system (SRS) for Honda. It evaluates the signals from the crash sensors and decides within milliseconds in an emergency which airbags and seatbelt pretensioners are triggered.

The control unit monitors the system continuously. If it detects a fault, it shows it via the airbag warning light in the instrument cluster.

After an accident the unit stores crash data and locks itself. How this shows up in everyday use and what to do then is explained in the following sections.

Why does the control unit 77960-3D4-A910-M2 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered; a normal diagnostic tool cannot delete it. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump starting.

The entry stays in the memory until it is erased. A commercial reader cannot do this, which is why the fault persists even when the vehicle has long been driven again.

The remaining causes concern the electronics in general. Components age, solder joints can go cold, and moisture attacks plug contacts. Only the inspection on the test bench shows which cause applies.

How can you tell that the 77960-3D4-A910-M2 is defective?

A defect in control unit 77960-3D4-A910-M2 can be recognised by several signs: by the airbag warning light in the instrument cluster, by an error message in the instrument cluster, and by a diagnostic tool without a connection to the control unit. In addition, the fault memory cannot then be cleared.

The warning light may burn constantly or only intermittently; both are serious. Airbags and seatbelt pretensioners may not be able to deploy in an emergency, so have the control unit checked promptly.

A diagnostic tool without a connection may point to the control unit, but need not. Only reading the memory shows what the cause is.

Which vehicles is the 77960-3D4-A910-M2 fitted in?

Control unit 77960-3D4-A910-M2 is fitted in these vehicles: Honda CR-V 6 (from 2022).

The following list shows the vehicles that are recorded in our data for this part number.

• Honda CR-V 6 (from 2022)

Firstly, compare the part number on the label of the removed unit with this page. This only confirms that you have the right unit. Secondly, have the fault memory read beforehand. Only this result shows whether the control unit itself is defective or whether a plug or a cable is the cause.

How does the repair of the 77960-3D4-A910-M2 work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove control unit 77960-3D4-A910-M2. Then create a repair order online and send the well-packed unit in. Airbag24 tests it on the test bench, replaces defective components, erases stored crash data and carries out a functional test; after that your own unit goes back to you.

For inspection, repair and testing at Airbag24, 3–4 working days are generally planned.

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 77960-3D4-A910-M2 get to Airbag24?

You send control unit 77960-3D4-A910-M2 as a parcel or arrange a UPS collection for an extra charge. After the repair, Airbag24 returns the unit by UPS.

Enclose the printed repair order in the parcel and pack the unit shock-proof.