Airbag control unit with part number 77960-T0A-N410-M3

What does the airbag control unit 77960-T0A-N410-M3 do?

The airbag control unit 77960-T0A-N410-M3 is the central computer of the restraint system (SRS) in Honda. It processes the signals from the crash sensors, decides in a crash on the airbags and seatbelt pretensioners, and monitors the system continuously.

The decision is made within a fraction of a second. To do this, the unit assesses acceleration and deceleration and then triggers the appropriate firing circuits.

It stores faults it finds and displays them via the airbag warning light in the instrument cluster. After a crash it records crash data and locks itself. Only the repair lifts the lock.

Why does the control unit 77960-T0A-N410-M3 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 does not erase it. Other causes include aged components, moisture and voltage spikes.

The crash data remains in the unit, even when the airbags show nothing outwardly. Airbag24 erases it during the repair.

Electronics, solder joints and plug connections are the areas where the other causes take effect. Which cause applies in your case only becomes clear during the inspection.

How can you tell that the 77960-T0A-N410-M3 is defective?

A defect shows up through the airbag warning light, which lights up permanently or intermittently, through fault messages in the instrument cluster, through a diagnostic tool without connection to the control unit, and through a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The signs are as follows:

• warning light in the instrument cluster lights up
• message in the instrument cluster
• diagnostic tool cannot reach the control unit
• fault memory cannot be cleared

The warning light is a clear indication. Do not ignore it; have the fault memory read out instead.

Which vehicles is the 77960-T0A-N410-M3 fitted in?

The 77960-T0A-N410-M3 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018).

This list shows the vehicles recorded for this part number:

• Honda CR-V 4 RM (2012-2018)

First, compare the part number on the label of the removed unit with this page; this only ensures that you have the right unit. Also have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 5WK43782, 77960-SWA-G212-M4, 77960-SWA-G214-M4, 77960-T1G-G920-M4.

How does the repair of the 77960-T0A-N410-M3 work?

First have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit. Next, create a repair order online and send the unit in, well packed. Airbag24 tests the unit, then the work is completed and your own unit is returned.

Airbag24 examines the unit on the test bench, repairs defective components, erases the crash data and carries out a function test. The unit then goes back to you.

Processing at Airbag24 usually takes 3–4 working days. This period applies only to the work done at Airbag24.

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-T0A-N410-M3 get to Airbag24?

You send the control unit as a parcel or book a UPS collection for an extra charge. Airbag24 returns it by UPS after the repair.

The printed repair order goes into the parcel, and the unit is packed shock-proof.