Airbag control unit with part number 77960-TR0-A22

What does the airbag control unit 77960-TR0-A22 do?

Control unit 77960-TR0-A22 is the central unit of the restraint system (SRS) for Honda. It evaluates the crash sensors, decides in a crash within milliseconds about airbags and seatbelt pretensioners, and monitors the system continuously. If it reports a fault, the airbag warning light comes on.

In the background the unit constantly checks sensors, wiring and trigger electronics. It records deviations in the fault memory.

After an accident the unit stores crash data and locks itself. The lock is lifted only by the repair.

Why does the control unit 77960-TR0-A22 fail?

Crash data from an earlier accident is the most common cause: it remains stored even when no airbag was triggered. Other causes of the 77960-TR0-A22 lie in aging components, cold solder joints, moisture at plug connections and voltage spikes.

A normal diagnostic tool cannot erase this crash data. At Airbag24, erasing it is part of the repair.

Aging components lose reliability over time, and cold solder joints form through faulty connections during manufacturing or later through stress. Moisture and corrosion attack plug connections.

Voltage spikes, for example with a weak battery or after a jump start, can additionally stress the electronics.

How can you tell that the 77960-TR0-A22 is defective?

A defect in the 77960-TR0-A22 shows up as the airbag warning light, which lights up permanently or intermittently, and as fault messages. The diagnostic tool may also fail to connect to the control unit, or the fault memory cannot be emptied. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The signs at a glance:

• airbag warning light lights up permanently or intermittently
• fault message in the instrument cluster
• no connection from the diagnostic tool to the control unit
• fault memory cannot be cleared

If you notice any of these signs, have the vehicle checked promptly before you rely on the restraint system.

Which vehicles is the 77960-TR0-A22 fitted in?

Control unit 77960-TR0-A22 is installed in these vehicles: Honda Civic 9th generation (2011-2017). The details are based on our database for this unit.

The list in detail:

• Honda Civic 9th generation (2011-2017)

First compare the part number on the label of the removed unit with this page, so you have the correct unit in front of you. Also have the fault memory read out beforehand, because only this result shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-TR0-3050-M4, 77960-TR0-A012-M1, 77960-TR0-A013-M1, 77960-TR0-A014-M1, 77960-TR0-A210-M1, 77960-TR0-A212-M1.

How does the repair of the 77960-TR0-A22 work?

First read out the fault memory and attach the log. Then disconnect the battery and only afterwards remove the control unit. Next, create a repair order online and send the unit well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a functional test. Afterwards your own unit 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-TR0-A22 get to Airbag24?

You send the unit as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends control unit 77960-TR0-A22 back by UPS.

The printed repair order goes into the parcel. Pack the unit shockproof.