Airbag control unit with part number 77960-T2A-S730-M1

What does the airbag control unit 77960-T2A-S730-M1 do?

The airbag control unit 77960-T2A-S730-M1 coordinates the restraint system (SRS) of Honda. From the signals of the crash sensors it calculates within milliseconds in an accident which airbags and seatbelt pretensioners are triggered; at the same time it monitors all components of the system. After an accident, it stores crash data and locks itself.

If a fault is detected, the unit switches on the airbag warning light in the instrument cluster. This tells you that something is wrong with the system.

Why does the control unit 77960-T2A-S730-M1 fail?

The most common cause is crash data stored after an accident, even without a deployed airbag; a normal diagnostic tool cannot erase it. Added to this are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

The electronics themselves can also be the cause. Ageing components, cold solder joints and moisture at the plug connections are among the typical reasons.

Voltage spikes affect the electronics throughout the vehicle, for example when the battery is weak or a jump start is connected.

How can you tell that the 77960-T2A-S730-M1 is defective?

A defect shows itself through an airbag warning light that stays on constantly or only intermittently, an error message in the instrument cluster, a lack of connection to the diagnostic tool, or a fault memory that cannot be cleared. Then airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light in particular gives a clear signal that is hard to overlook.

A connection that the diagnostic tool cannot establish means that the control unit cannot be read out; a fault memory that cannot be cleared is likewise a reason to have the finding checked.

Which vehicles is the 77960-T2A-S730-M1 fitted in?

The control unit 77960-T2A-S730-M1 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018). Whether your vehicle is affected too can only be roughly estimated from the list.

The vehicles recorded for this number are listed below:

• Honda CR-V 4 RM (2012-2018)

Compare the part number on the label of the removed unit with this page; this only confirms that the correct unit is at hand. Have the fault memory read out; only this log shows whether the control unit is defective or whether a connector or a 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-S730-M1 work?

First you have the fault memory read out and enclose the log. Then you disconnect the battery, remove the control unit and create a repair order online. Afterwards you pack the unit well and send it in; Airbag24 then checks it on the test bench, replaces defective components, erases stored crash data and carries out a function test, after which your own unit is returned.

The sequence is dictated by safety: the battery is disconnected only after the fault memory has been read out, and the control unit leaves the vehicle only afterwards.

At Airbag24, checking, repairing and testing usually takes 3–4 working days.

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-S730-M1 get to Airbag24?

You send the unit as a normal parcel, or you book a UPS collection for an extra charge. Airbag24 returns it to you by UPS after the repair. Put the printed repair order into the parcel before you close it.

The control unit should be packed shock-proof, for example in a sturdy box with padding material.