Airbag control unit with part number 77960-T2A-Y611-M4

What does the airbag control unit 77960-T2A-Y611-M4 do?

The airbag control unit 77960-T2A-Y611-M4 controls the restraint system (SRS) for Honda. It evaluates the crash sensors, decides within milliseconds in a crash which airbags and seatbelt pretensioners to trigger, and monitors the system continuously.

The control unit issues faults via the airbag warning light in the instrument cluster. After an accident it stores crash data and locks itself.

The electronics work together with sensors, wiring and trigger modules. A fault may therefore also lie in the wiring or the sensors.

Why does the control unit 77960-T2A-Y611-M4 fail?

The most common cause of 77960-T2A-Y611-M4 failing is crash data stored after an accident, even if no airbag has triggered. Aged components, cold solder joints, moisture and corrosion at plugs, as well as voltage spikes, are also possible causes.

Crash data cannot be deleted with a normal diagnostic tool. Airbag24 removes it during the repair.

Aged electronics, solder joints that have gone cold, and moisture at the plug connections disrupt the signals. Voltage spikes, for example with a weak battery or when jump-starting, additionally stress the components.

How can you tell that the 77960-T2A-Y611-M4 is defective?

A defect in 77960-T2A-Y611-M4 is recognised by the airbag warning light in the instrument cluster, a fault message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared.

If the warning light stays on constantly or only intermittently, that is a clear signal. The message in the instrument cluster accompanies the display and points to the affected area.

If no connection to the control unit can be established or the fault memory cannot be cleared, the system must be checked. Until then, airbags and seatbelt pretensioners may possibly not trigger in an emergency.

Which vehicles is the 77960-T2A-Y611-M4 fitted in?

The control unit 77960-T2A-Y611-M4 matches the stored models of Honda. It is fitted in these vehicles: Honda Accord 9th generation (2012-2019).

The known vehicles for this part number are compiled in the list below.

• Honda Accord 9th generation (2012-2019)

Comparing the part number on the label of the removed unit with this page ensures only that you have the correct unit. Whether the control unit is defective or a plug or cable is the cause is clarified by the fault memory, which you have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 77960-SEA-G815-M1, 77960-T3L-A012-M1, C0W6K4VDA.

How does the repair of the 77960-T2A-Y611-M4 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and remove the control unit 77960-T2A-Y611-M4; afterwards create the repair order online and send in the unit well packed. At Airbag24, testing, repairing and checking usually take 3–4 working days.

The sequence is mandatory for safety reasons, so the control unit is only removed after the battery has been disconnected.

At Airbag24 the unit is examined on the test bench, defective components are replaced, the crash data is deleted and a function test is carried out.

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-Y611-M4 get to Airbag24?

You send the control unit 77960-T2A-Y611-M4 in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Print the repair order, put it in the box and pad the unit shock-resistant.