Airbag control unit with part number 77960-TNY-G220-M4

What does the airbag control unit 77960-TNY-G220-M4 do?

In the Honda vehicle the unit 77960-TNY-G220-M4 controls the restraint system (SRS). It monitors the crash sensors continuously and decides in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered.

It evaluates the signals from the crash sensors and indicates faults via the airbag warning light in the instrument cluster.

After an accident the unit stores crash data and locks itself. The lock is lifted only by the repair.

Why does the control unit 77960-TNY-G220-M4 fail?

Stored crash data after an accident are the most common cause for the 77960-TNY-G220-M4, even without a triggered airbag. Ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes can likewise lead to failure.

Erasing the crash data does not succeed with a standard diagnostic tool. Airbag24 erases them during the repair.

The other causes relate to ageing and moisture in the unit. A weak battery and jump-starting are examples of voltage spikes.

How can you tell that the 77960-TNY-G220-M4 is defective?

An airbag warning light that lights up permanently or intermittently in the instrument cluster indicates a defect on the 77960-TNY-G220-M4. In addition there are fault messages in the instrument cluster, a diagnostic tool with no connection to the control unit, and a fault memory that cannot be cleared.

The display is therefore the indication to watch. In an emergency, airbags and seatbelt pretensioners may possibly not deploy.

Whether the control unit itself is defective is shown by reading out the fault memory.

Which vehicles is the 77960-TNY-G220-M4 fitted in?

The airbag control unit 77960-TNY-G220-M4 is fitted in these vehicles: Honda CR-V 5 (2018-2023). A comparison of the part number on the label of the removed unit with this page shows whether it is the correct unit.

The vehicles for which this part number is known are listed below:

• Honda CR-V 5 (2018-2023)

The label comparison only confirms the number, not the cause. Please have the fault memory read out before sending the unit in. Only then does it show whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-TLA-A240-M4, 77960-TLA-A250-M4, 77960-TLA-A310-M4, 77960-TLA-A320-M4, 77960-TLA-A410-M4, 77960-TLA-A420-M4.

How does the repair of the 77960-TNY-G220-M4 work?

First have the fault memory read out and attach the log, then disconnect the battery; only then remove the control unit 77960-TNY-G220-M4. Finally create a repair order online and send in the unit well packed.

This sequence serves safety and is binding.

Airbag24 checks the submitted unit on the test bench, repairs defective components and erases stored crash data. A function test follows. Checking, repairing and testing usually take 3–4 working days.

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-TNY-G220-M4 get to Airbag24?

You send the control unit 77960-TNY-G220-M4 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 with the parcel and pack the unit shock-proof.