Airbag control unit with part number 77960-TGG-Z820-M4

What does the airbag control unit 77960-TGG-Z820-M4 do?

The airbag control unit 77960-TGG-Z820-M4 is the control centre of the restraint system (SRS) in Honda vehicles. It evaluates the sensors, determines in an accident which airbags and seatbelt pretensioners are triggered, and indicates faults via the airbag warning light.

Monitoring runs continuously in the background, while the decision in a crash takes only milliseconds.

After an accident, the unit stores crash data and locks itself.

Why does the control unit 77960-TGG-Z820-M4 fail?

On the control unit 77960-TGG-Z820-M4, stored crash data from an accident is the most common cause, even if no airbag was triggered. Aged electronics, cold solder joints, moisture and corrosion, and voltage spikes can also lead to failure.

A normal diagnostic tool cannot erase this data. Airbag24 erases it in the course of the repair.

Voltage spikes arise, for example, from a weak battery or from jump-starting, and they put additional strain on the electronics.

How can you tell that the 77960-TGG-Z820-M4 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently. In addition, a fault message may appear, the diagnostic tool gets no connection to the control unit, or the fault memory cannot be erased. These signs point to a defect in the 77960-TGG-Z820-M4.

As long as the fault persists, airbags and seatbelt pretensioners may fail to trigger in an emergency. A warning light that does not go out therefore calls for a prompt check.

Whether the control unit itself or only a line is affected is shown by the fault memory that you have read out with a diagnostic tool.

Which vehicles is the 77960-TGG-Z820-M4 fitted in?

The control unit 77960-TGG-Z820-M4 is fitted in these vehicles: Honda Civic 10th generation (2015-2022).

For this control unit we record the following vehicle details:

• Honda Civic 10th generation (2015-2022)

A comparison of the part number on the label of the removed unit with this page only confirms that you have the right unit. The fault memory, on the other hand, shows whether the control unit is defective or whether a plug or cable is the cause; so have it read out beforehand.

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-Z820-M4 work?

In the repair of the 77960-TGG-Z820-M4, first have the fault memory read out and attach the log. Then disconnect the battery before you remove the control unit. Next, create a repair order online and send the unit in well packed; processing at Airbag24 usually takes 3–4 working days.

At the test bench, Airbag24 examines the unit, repairs components with a defect, erases stored crash data and carries out a function test. 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-Z820-M4 get to Airbag24?

You send the control unit 77960-TGG-Z820-M4 as a parcel or book a collection by UPS for an extra charge. Airbag24 sends it back to you by UPS after the repair.

Put the printed repair order into the parcel and pack the control unit shock-resistant.