Airbag control unit with part number 77960-T2A-S721-M1

What does the airbag control unit 77960-T2A-S721-M1 do?

The 77960-T2A-S721-M1 is the central control unit of the airbag system in Honda. It processes the signals from the crash sensors, determines which airbags and seatbelt pretensioners are to be deployed in an accident, and monitors the entire system in the background.

If a fault is detected, the unit informs you via the airbag warning light. After an accident, it also stores crash data and locks itself.

Why does the control unit 77960-T2A-S721-M1 fail?

Stored crash data is the most common cause, even when no airbag has deployed. A standard diagnostic tool cannot delete it; Airbag24 takes care of it during the repair. Other possible causes are ageing components, cold solder joints, moisture and corrosion on connectors, and voltage spikes.

After an accident, the control unit creates the crash data itself. The data stays stored in the unit until the repair deletes it.

The remaining causes are rather general in nature: electronic components age, solder joints can go cold, and moisture attacks plug connections.

A weak battery or a jump start can generate voltage spikes that damage the electronics.

How can you tell that the 77960-T2A-S721-M1 is defective?

A defect in the 77960-T2A-S721-M1 shows up as the airbag warning light in the instrument cluster lighting up permanently or intermittently. In addition, an error message may appear, the diagnostic tool may find no connection to the control unit, and the fault memory cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

The warning light shows the fault directly, so you do not have to search for it first. Take the signal seriously and have what lies behind it checked promptly.

Which vehicles is the 77960-T2A-S721-M1 fitted in?

The 77960-T2A-S721-M1 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018). The part number on the unit helps you classify your car, but the details alone do not prove a defect.

The vehicle list in detail:

• Honda CR-V 4 RM (2012-2018)

Compare the part number on the label of the removed unit with this page. This ensures that you have the right unit in front of you. Before that, have the fault memory read out, as this shows whether the control unit itself is defective or a plug or 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-S721-M1 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and send the 77960-T2A-S721-M1 in well packed. Airbag24 generally needs 3–4 working days for this work.

On the test bench, Airbag24 examines the unit, repairs defective components, deletes stored crash data and carries out a function test. Your own, repaired unit then comes back 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-T2A-S721-M1 get to Airbag24?

You send the 77960-T2A-S721-M1 as a parcel, or arrange a UPS collection for an extra charge. The return after the repair is also made by UPS.

Put the printed repair order into the parcel. Pack the control unit shockproof so that it survives transport undamaged.