Airbag control unit with part number 77960-TG1-U411-M3

What does the airbag control unit 77960-TG1-U411-M3 do?

The airbag control unit 77960-TG1-U411-M3 controls the restraint system (SRS) of Honda. The signals of the crash sensors converge there, and in an accident the unit decides within milliseconds on the triggering of airbags and seatbelt pretensioners.

It continuously checks all components of the system. If it finds a deviation, it switches on the airbag warning light in the instrument cluster.

After an accident it stores crash data and locks itself. Only the repair lifts this lock.

Why does the control unit 77960-TG1-U411-M3 fail?

For the control unit 77960-TG1-U411-M3, the most common cause lies in crash data stored after an accident, even if no airbag was triggered. Further triggers are aged components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

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

The other causes tend to develop gradually. Electronic components age, solder joints can be cold, and moisture attacks plug connectors. Voltage spikes arise, for example, from a weak battery or when connecting jump leads.

How can you tell that the 77960-TG1-U411-M3 is defective?

A defect on the 77960-TG1-U411-M3 shows itself through the airbag warning light in the instrument cluster, which lights up constantly or intermittently, and through an error message in the instrument cluster.

Typical signs are also:

• The diagnostic tool gets no connection to the control unit.
• The fault memory cannot be cleared.

With these signs, airbags and seatbelt pretensioners may possibly not deploy in an emergency. Anyone who sees the warning light should have the cause checked promptly.

Which vehicles is the 77960-TG1-U411-M3 fitted in?

The control unit 77960-TG1-U411-M3 is fitted in these vehicles: Honda City 6th generation (2008-2013).

The following overview shows the vehicles for which this unit is listed.

• Honda City 6th generation (2008-2013)

You can compare the part number on the label with the unit you removed yourself. It confirms that it is the correct unit. Have the fault memory read out first, because it shows whether the control unit or a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77810-T9DT81ZA, 77960-T00-Y810-M2.

How does the repair of the 77960-TG1-U411-M3 work?

First have the fault memory read out, then disconnect the battery and only then remove the control unit. Afterwards create a repair order online and send in the well-packed unit. At Airbag24, inspection, repair and function test take 3–4 working days.

Attach the read-out log to the parcel. Airbag24 checks the unit on the test bench, renews defective components, deletes the crash data and carries out a function test. Afterwards your own, repaired 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-TG1-U411-M3 get to Airbag24?

You send the control unit 77960-TG1-U411-M3 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back via UPS.

The unit must be packed shock-proof, and the printed repair order goes into the parcel.