Airbag control unit with part number 77960-T2A-H712-M1

What does the airbag control unit 77960-T2A-H712-M1 do?

The airbag control unit 77960-T2A-H712-M1 is the SRS control unit for Honda and thus the central unit of the restraint system. It evaluates the signals from the crash sensors, decides in a collision within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the system permanently. After a crash it stores crash data and locks itself.

The evaluation runs in the background as soon as the system has power. The unit checks the sensors, the wiring and its own circuits.

If a deviation is found, the unit reports it via the airbag warning light. This tells the driver that the restraint system needs to be checked.

Why does the control unit 77960-T2A-H712-M1 fail?

The most frequent cause is crash data stored after a crash, even if no airbag deployed; a normal diagnostic tool cannot delete it. Airbag24 deletes the crash data during the repair. Other causes include aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Crash data is the cause that occurs most often in practice. It is stored after a crash even if the airbag was not deployed. For that reason, a diagnostic tool from the trade cannot simply remove it.

The other causes lie inside the technology. Electronics age, solder joints can go cold, and moisture or corrosion affects the plug connections. Voltage spikes, for example from a weak battery or from starting with an external power source, also do damage.

How can you tell that the 77960-T2A-H712-M1 is defective?

A defect shows up on the airbag warning light in the instrument cluster, which lights up permanently or intermittently. An error message in the instrument cluster likewise indicates this, and a diagnostic tool finds no connection to the control unit. In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

The warning light is the first sign you will notice. If it stays on or lights up only intermittently, a prompt check is advisable, even if the vehicle still drives without problems.

A fault memory that cannot be cleared is a further indication. Together with the warning light, this is a clear sign that the system is not in order.

Which vehicles is the 77960-T2A-H712-M1 fitted in?

Whether your vehicle fits can be quickly clarified with the model list. The 77960-T2A-H712-M1 is fitted at Honda in these vehicles: Honda CR-V 4 RM (2012-2018).

Here are the vehicles in which this control unit has been recorded:

• Honda CR-V 4 RM (2012-2018)

Compare the part number on the label of the removed unit with this page so you know it is the correct unit. However, this says nothing about whether the unit is defective. Therefore have the fault memory read out beforehand, because only that result shows whether the control unit or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-T0A-3070-M4, 77960-T0A-A012-M1, 77960-T0A-A013-M1, 77960-T0A-A210-M1, 77960-T0A-A212-M1, 77960-T0A-A230-M1.

How does the repair of the 77960-T2A-H712-M1 work?

First have the fault memory read out and the log attached, then disconnect the battery and remove the control unit. Then create a repair order online and send the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, deletes the stored crash data and carries out a function test. This time applies only to checking, repairing and testing at Airbag24.

Afterwards your own unit goes back 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-T2A-H712-M1 get to Airbag24?

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

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