Airbag control unit with part number 77960-TGG-J320-M4

What does the airbag control unit 77960-TGG-J320-M4 do?

The airbag control unit 77960-TGG-J320-M4 forms the central control of the restraint system for Honda. It evaluates the signals from the crash sensors, decides within milliseconds in an accident on triggering airbags and seatbelt pretensioners, and monitors the entire system. After an accident it stores crash data and locks itself.

The unit passes on any faults it finds via the airbag warning light in the instrument cluster, so that the condition is visible on the dashboard.

In everyday life the unit goes unnoticed; it works in the background.

Why does the control unit 77960-TGG-J320-M4 fail?

The most common cause with the 77960-TGG-J320-M4 is crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it, and the control unit therefore reports faults. The other causes are aged electronics, moisture at plugs and voltage spikes.

Aged electronics lose reliability over time, and cold solder joints connect poorly at intervals.

Moisture and corrosion attack plug connections. Voltage spikes, for example from a weak battery or a jump start, load the electronics additionally.

How can you tell that the 77960-TGG-J320-M4 is defective?

On the 77960-TGG-J320-M4, the airbag warning light in the instrument cluster shows that it is lit permanently or intermittently, and a fault message appears in the instrument cluster. In addition there is a lack of connection between the diagnostic tool and the control unit, or a fault memory that cannot be cleared; then airbags and seatbelt pretensioners may possibly not trigger in an emergency.

The warning light is the most direct indication the vehicle gives, and it shows the fault as soon as the unit detects it.

A disrupted connection to the diagnostic tool can also be due to a plug or a cable. On its own it therefore does not prove that the control unit itself is affected.

Which vehicles is the 77960-TGG-J320-M4 fitted in?

The control unit 77960-TGG-J320-M4 is fitted in these vehicles: Honda Civic 10th generation (2015-2022).

The listing shows which models and equipment variants belong to this unit.

• Honda Civic 10th generation (2015-2022)

Comparing the part number on the label of the removed unit with this page ensures that you have the correct unit in front of you. Have the fault memory read out beforehand, because only this log shows whether the control unit is defective or whether a plug or a 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-J320-M4 work?

You have the fault memory read out and enclose the log. Then you disconnect the battery, only afterwards remove the control unit and create a repair order online. Send in the well-packed unit; processing at Airbag24 usually takes 3–4 working days.

This sequence is prescribed for safety reasons.

At Airbag24 the unit is first examined on the test bench. Afterwards defective components are repaired, crash data erased and a function test carried out.

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-J320-M4 get to Airbag24?

You send the control unit 77960-TGG-J320-M4 as a parcel or arrange a UPS collection for an extra charge. Airbag24 sends the unit back to you by UPS after the repair.

The printed repair order goes into the parcel. Shock-resistant packaging protects the unit.