Airbag control unit with part number 77960-T3X-H910-M4

What does the airbag control unit 77960-T3X-H910-M4 do?

The 77960-T3X-H910-M4 is the central control unit of the restraint system (SRS) for Honda. It evaluates the crash sensors, decides within milliseconds in an accident whether to trigger the airbags and seatbelt pretensioners, and monitors the entire system. After an accident it stores crash data and locks itself.

While driving, the unit checks its components continuously. If it detects a fault, the airbag warning light in the instrument cluster comes on.

The crash data stays in the unit even if the vehicle drives normally again afterwards. In everyday use you will not notice anything of this.

Why does the control unit 77960-T3X-H910-M4 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other causes are ageing electronic components, cold solder joints, moisture and voltage spikes.

Ageing electronic components show weaknesses over time, and cold solder joints can likewise lead to faults. Which cause applies in an individual case only becomes clear when the fault memory is read out.

Moisture and corrosion mainly affect the plug connections. Voltage spikes, for example from a weak battery or from jump-starting, put additional strain on the electronics.

How can you tell that the 77960-T3X-H910-M4 is defective?

A defect shows up as the airbag warning light in the instrument cluster lighting up permanently or intermittently, as a fault message in the instrument cluster, as the diagnostic tool having no connection to the control unit, or as a fault memory that cannot be cleared. In that case, airbags and seatbelt pretensioners may not be able to deploy in an emergency.

The warning light is the most important warning sign of this unit. Even if the vehicle runs unremarkably in everyday use, it shows the finding in the system.

A missing connection to the diagnostic tool can also be due to the wiring. Only reading out the fault memory shows whether the control unit itself is affected.

Which vehicles is the 77960-T3X-H910-M4 fitted in?

The 77960-T3X-H910-M4 is fitted in these vehicles: Honda Accord 9th generation (2012-2019).

The following list shows the vehicles stored for this part number.

• Honda Accord 9th generation (2012-2019)

Comparing the part number on the label of the removed unit with this page only confirms that it is the right unit. Separately, the fault memory reading shows whether the control unit is defective or whether a plug or cable is the cause. You should do both before removal.

For the same vehicles, we also repair control units with the part numbers 77960-T2A-A013-M4, 77960-T2A-A020-M4, 77960-T2A-A021-M4, 77960-T2A-A030-M4, 77960-T2A-D011-M4, 77960-T2A-D020-M4.

How does the repair of the 77960-T3X-H910-M4 work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit. Then create a repair order online and send in the unit. At Airbag24, processing usually takes 3–4 working days.

The order of these steps is for safety: the unit is only removed after reading out and disconnecting.

At Airbag24 the team checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. Afterwards your own unit is returned 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-T3X-H910-M4 get to Airbag24?

You send the 77960-T3X-H910-M4 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Put the printed repair order into the parcel and pack the unit shockproof.