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

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

The 77960-TEA-Z820-M4 acts as the airbag control unit that controls the restraint system (SRS) in Honda. Sensors report impact and acceleration values, and the control unit decides from these which airbags and seatbelt pretensioners are triggered in an accident.

The unit works continuously and reports faults via the airbag warning light. After an accident it stores crash data and locks itself. The lock is only lifted by the repair.

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

Crash data stored after an accident is the most common cause, even if no airbag has deployed. It cannot be removed with a standard diagnostic tool. Further triggers are aged components on the circuit board, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

The crash data remains stored until Airbag24 deletes it during the repair. This is possible, just not with a usual tool.

The remaining triggers can only be narrowed down by a precise examination.

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

A defect shows up through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. In addition, fault messages appear in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

This means airbags and seatbelt pretensioners may possibly not deploy in an emergency. Do not ignore this danger.

The warning light comes on as soon as the system notices the fault, and it is therefore the clearest hint of a defect.

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

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

The list below shows the vehicles one by one:

• Honda Civic 10th generation (2015-2022)

Comparing the part number on the label of the removed unit with this page only confirms that it is the correct unit. Have the fault memory read out first. Only then do you see whether the control unit is defective or a plug or cable is responsible.

For the same vehicles, we also repair control units with the part numbers 77960-SMG-G014-M1, 77960-TBA-A01, 77960-TBA-A02, 77960-TBA-A03, 77960-TBA-A04, 77960-TBA-A05.

How does the repair of the 77960-TEA-Z820-M4 work?

First have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit. Afterwards create a repair order online.

Then pack the unit well and send it in. Airbag24 checks it on the test bench, replaces defective components, deletes the crash data and carries out a function test. After that your own unit is returned to you.

Processing at Airbag24 usually takes 3–4 working days. This period covers only testing, repairing and function checking. 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-TEA-Z820-M4 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends it back to you by UPS.

Enclose the printed repair order and pack the control unit shock-proof.