Airbag control unit with part number 77960-T2A-K012-M4

What does the airbag control unit 77960-T2A-K012-M4 do?

The airbag control unit 77960-T2A-K012-M4 evaluates the signals from the crash sensors and controls the restraint system (SRS) of Honda in a crash. It decides within milliseconds which airbags and seatbelt pretensioners are triggered.

During operation, it monitors the system and indicates faults via the airbag warning light.

After a crash, the unit stores crash data and locks itself.

Why does the control unit 77960-T2A-K012-M4 fail?

The most common cause in the 77960-T2A-K012-M4 is crash data stored after an accident, even if no airbag has deployed. Other causes include ageing components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Such crash data cannot be erased with an ordinary diagnostic tool. Airbag24 removes it during the repair.

The other causes concern the electronics and their power supply. Ageing components and cold solder joints lead to unreliable connections, while moisture, corrosion and voltage spikes put additional strain on the electronics.

How can you tell that the 77960-T2A-K012-M4 is defective?

A defect in the 77960-T2A-K012-M4 shows up as a glowing airbag warning light, an error message, a missing connection to the diagnostic tool or a fault memory that cannot be cleared, even after an attempt to clear it.

The airbag warning light in the instrument cluster either stays on permanently or lights up only intermittently. An error message in the instrument cluster may appear alongside it.

If the diagnostic tool has no connection to the control unit, or the fault memory remains despite an attempt to clear it, this is also a sign of a fault. Airbags and seatbelt pretensioners may then fail to trigger in an emergency, so a prompt check is advisable.

Which vehicles is the 77960-T2A-K012-M4 fitted in?

The 77960-T2A-K012-M4 is fitted in these vehicles: Honda Accord 9th generation (2012-2019).

These vehicles are on record 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 the identity of the unit.

Before removal, it is worth having the fault memory read out. Only that reveals whether the control unit is defective or whether a plug or 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-T2A-K012-M4 work?

First, have the fault memory read out and enclose the printout. Then disconnect the battery and only then remove the 77960-T2A-K012-M4. Create the repair order online and pack the unit well. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24, the unit goes onto the test bench, defective components are replaced, the crash data is erased and a function test is run. Afterwards, your own unit goes back to you.

The 3–4 working days cover only checking, repairing and testing at Airbag24.

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-K012-M4 get to Airbag24?

You send the 77960-T2A-K012-M4 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit by UPS.

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