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

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

The unit 77960-TGH-Z810-M4 controls the restraint system (SRS) at Honda as an airbag control unit. Using the crash sensors, it works out in an accident which airbags and seatbelt pretensioners are triggered. It reports faults via the airbag warning light.

While driving, it checks the system continuously so that the technology is available in an emergency.

After an accident, the control unit stores crash data and locks itself. This section deliberately leaves out further detail.

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

The most common cause is crash data stored after an accident, even if no airbag has fired, and a normal diagnostic tool cannot delete this data. Other causes include ageing electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data stays in the control unit until Airbag24 deletes it during the repair. Airbag24 takes on this deletion as part of the repair.

The remaining causes concern everyday electronics. Components age, solder joints can be cold, and moisture or corrosion affects plug connections.

Voltage spikes, for example from a weakened battery or jump-starting, can also damage the electronics. Only the test shows which cause is actually present.

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

You recognise a fault mainly by the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Further signs may also point to it. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The signs at a glance:

• airbag warning light on permanently or intermittently
• fault message in the instrument cluster
• no connection between diagnostic tool and control unit
• fault memory cannot be cleared

Take the light seriously, because it is the warning from the restraint system. It shows that a fault exists rather than merely suspecting one.

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

The part number 77960-TGH-Z810-M4 belongs to Honda. This control unit is fitted in these vehicles: Honda Civic 10th generation (2015-2022).

The list below shows the vehicles to which the unit is assigned.

• Honda Civic 10th generation (2015-2022)

Comparing the part number on the label with this page only confirms that it is the right unit. Whether it is itself defective is shown only by the fault memory, which you should have read before removal.

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-TGH-Z810-M4 work?

The process begins with reading the fault memory, whose log you enclose. Only then is the battery disconnected and the control unit removed. You create the repair order online. Airbag24 usually takes 3–4 working days to process it.

Airbag24 then tests the unit on the test bench, repairs defective components, deletes crash data and carries out a function test before it is returned.

The fixed sequence protects the vehicle's electrical system during the work.

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-TGH-Z810-M4 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the work, Airbag24 returns the repaired unit by UPS.

Pack the printed repair order into the parcel and pack the unit shock-proof.