Airbag control unit with part number 77960-TEG-J310-M4

What does the airbag control unit 77960-TEG-J310-M4 do?

The airbag control unit 77960-TEG-J310-M4 is the central switching point of the restraint system (SRS) in Honda. It processes the measured values of the crash sensors and decides in an impact within milliseconds whether airbags and seatbelt pretensioners are triggered. After an accident, it stores crash data and locks itself.

The unit also checks the entire system during operation, that is, the sensors, firing circuits and connections. If it finds a fault, it reports this via the airbag warning light in the instrument cluster.

Only a repair lifts the lock, nothing else.

Why does the control unit 77960-TEG-J310-M4 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. This data cannot be erased with a normal diagnostic tool. Aged components, dry solder joints, moisture and corrosion at plugs, and voltage spikes also play a role.

The crash data remains in the memory, regardless of whether the vehicle was driven on normally afterwards. This connection is easily overlooked, because nothing may be visible on the vehicle from outside.

The other causes lie in the electrical area. Electronics can age, dry solder joints can form, moisture and corrosion attack plug connections, and voltage spikes stress the circuit, for example with a weak battery or a jump start.

How can you tell that the 77960-TEG-J310-M4 is defective?

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

• Airbag warning light in the instrument cluster lights up permanently or intermittently
• Fault message in the instrument cluster
• No connection between the diagnostic tool and the control unit
• Fault memory cannot be cleared

In that case, airbags and seatbelt pretensioners may not trigger in an emergency. The message should therefore be taken seriously.

A defect does not stay hidden, because the light shows it. Anyone who sees the light should have the system checked promptly.

Which vehicles is the 77960-TEG-J310-M4 fitted in?

The 77960-TEG-J310-M4 is fitted in these vehicles: Honda Civic 10th generation (2015-2022).

The vehicles are recorded in this overview:

• Honda Civic 10th generation (2015-2022)

Compare the part number on the label of the removed unit with this page. That way you can be sure that you have the correct unit. This comparison does not say anything about the cause. For that, have the fault memory read out beforehand, because only the result shows 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-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-TEG-J310-M4 work?

Processing at Airbag24 typically takes 3–4 working days. First you read out the fault memory and enclose the log with the unit; then you disconnect the battery. Only after that do you remove the control unit 77960-TEG-J310-M4, create a repair order online and send it in well packed.

Airbag24 checks the unit on the test bench and replaces defective components. Afterwards stored crash data is erased and a function test shows that the unit works. Only then does the unit go 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-TEG-J310-M4 get to Airbag24?

Either you send in the control unit 77960-TEG-J310-M4 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

The printed repair order belongs in the parcel. Pack the unit in a shock-resistant way so that it survives the shipment undamaged.