Airbag control unit with part number 77960-TGG-Z810-M4

What does the airbag control unit 77960-TGG-Z810-M4 do?

The airbag control unit 77960-TGG-Z810-M4 is the control centre of the restraint system (SRS) at Honda. It evaluates the signals from the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the entire system. After an accident it stores crash data and locks itself.

In everyday use the unit works unobtrusively in the background. As soon as it detects a fault, it reports this via the airbag warning light in the instrument cluster.

The restraint system is only reliable if the electronics work without fault.

Why does the control unit 77960-TGG-Z810-M4 fail?

The most common cause is crash data stored after an accident, even without a triggered airbag; a normal diagnostic tool cannot delete it. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

The following further causes come into consideration:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connectors
• voltage spikes, for example from a weak battery or a jump start

The crash data remains in the memory even if no airbag has triggered.

How can you tell that the 77960-TGG-Z810-M4 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message may appear in the instrument cluster. The diagnostic tool then finds no connection to the control unit, and the fault memory remains. In an emergency airbags and seatbelt pretensioners may possibly not trigger.

The light is therefore the primary indicator.

The indication is no trifle but a signal that the system explicitly gives, and it calls for attention.

Which vehicles is the 77960-TGG-Z810-M4 fitted in?

The control unit 77960-TGG-Z810-M4 is fitted in these vehicles: Honda Civic 10th generation (2015-2022). The assignment belongs to the part number and does not exempt you from a check.

The list for this part number:

• Honda Civic 10th generation (2015-2022)

You compare the label on the removed unit with the part number on this page to be sure you have the right unit. Having the fault memory read out beforehand shows, by contrast, 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 77960-3A2-A810-M2, 77960-3A2-A820-M2, 77960-3A2-A830-M2, 77960-TBA-A01, 77960-TBA-A02, 77960-TBA-A03.

How does the repair of the 77960-TGG-Z810-M4 work?

First have the fault memory read out and attach the log, then disconnect the battery and remove the control unit. Create a repair order online and send in the well-packed unit. Testing, repair and function test at Airbag24 take 3–4 working days as a rule.

At Airbag24 the unit goes on the test bench. Defective components are repaired, stored crash data is deleted, and a function test is carried out. Afterwards your own unit goes 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-TGG-Z810-M4 get to Airbag24?

You send the unit as a parcel; alternatively, you book a UPS collection for an extra charge. After the repair Airbag24 returns it by UPS.

The printed repair order goes into the parcel, and the unit is packed shock-resistant.