Airbag control unit with part number 77960-T2F-D020-M4

What does the airbag control unit 77960-T2F-D020-M4 do?

The airbag control unit 77960-T2F-D020-M4 is the control unit of the restraint system in Honda. Using the crash sensors, it detects an accident and determines which airbags and seatbelt pretensioners fire. It also checks the system continuously and displays faults via the airbag warning light.

After an accident, the unit stores crash data and locks itself, and this data remains preserved in the control unit.

Why does the control unit 77960-T2F-D020-M4 fail?

The most common cause is stored crash data, even when no airbag has deployed. This data cannot be erased with a normal diagnostic tool. Ageing components, dry solder joints, moisture and corrosion on plug connectors, and voltage spikes also play a role.

Crash data is created in the control unit itself. From outside, nothing can be seen in the electronics.

The other causes tend to develop gradually. Electronic components age, solder joints go dry, and moisture causes plug connectors to corrode.

Voltage spikes, by contrast, are sudden, for example when the battery is weak or a jump start is connected.

How can you tell that the 77960-T2F-D020-M4 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and the instrument cluster shows a fault message. In addition, there is no connection to the diagnostic tool, and the fault memory cannot be cleared. In that case, airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light is a signal from the system itself. Trust that it does not light up for no reason, and have the fault memory read out.

A fault in the control unit can show itself in different ways, and not every sign is unambiguous. That is why the fault memory counts for more than any assumption.

Which vehicles is the 77960-T2F-D020-M4 fitted in?

The vehicles in which the airbag control unit 77960-T2F-D020-M4 is fitted are: Honda Accord 9th generation (2012-2019).

The overview is as follows:

• Honda Accord 9th generation (2012-2019)

Comparing the part number on the label of the removed unit with this page is done on the removed unit, and it only confirms that this is the correct unit. Have the fault memory read out beforehand, because the 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 77960-SEA-G815-M1, 77960-T3L-A012-M1, C0W6K4VDA.

How does the repair of the 77960-T2F-D020-M4 work?

First have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit 77960-T2F-D020-M4. Then create a repair order online and send the unit in well packed. Airbag24 checks, repairs and tests it, erases the crash data and returns your own unit to you.

The order of steps is fixed for safety reasons.

At Airbag24, processing usually takes 3–4 working days. This period covers checking, repairing and testing at Airbag24 alone.

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-T2F-D020-M4 get to Airbag24?

You send the control unit 77960-T2F-D020-M4 as a parcel to Airbag24, or you book a UPS collection for an extra charge. UPS handles the return after the repair.

Do not forget the printed repair order, and pack the unit shock-resistant.