Airbag control unit with part number 77960-T0N-U910-M4

What does the airbag control unit 77960-T0N-U910-M4 do?

The airbag control unit 77960-T0N-U910-M4 is the central control unit of the restraint system (SRS) for Honda. It measures the signals from the crash sensors continuously, decides in a crash within fractions of a second whether airbags and seatbelt pretensioners are triggered, and monitors the entire system. Faults are shown on the airbag warning light.

The control unit works constantly in the background. It compares the measured values with stored specifications and checks whether the triggers can be addressed correctly. This is how the system detects deviations before they become relevant in an emergency.

After an accident, the unit stores crash data and locks itself. This state is part of every examination of the control unit.

Why does the control unit 77960-T0N-U910-M4 fail?

Most common cause: crash data stored after an accident, even if no airbag has deployed. These data cannot be erased with a normal diagnostic tool. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

The stored crash data is the reason why the unit cannot be reset with standard tools. The fault therefore remains even if the electronics themselves are working properly.

Aged components and cold solder joints may show up only under vibration or temperature changes. Moisture and corrosion at plug connections worsen the contact. Voltage spikes occur when the battery is weak or the vehicle is started with external power, and they stress the electronics directly.

How can you tell that the 77960-T0N-U910-M4 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently. In addition, a fault message appears in the instrument cluster, and the diagnostic tool gets no connection to the control unit. The fault memory also cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

The airbag warning light shows the defect, and you do not need to connect a tool to see it. If you ignore it for a long time, you miss the opportunity to clarify the cause early.

In everyday use, the message in the instrument cluster alone can be enough as a sign. Take this display seriously and have the fault memory read out as soon as it appears.

Which vehicles is the 77960-T0N-U910-M4 fitted in?

The control unit 77960-T0N-U910-M4 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018).

The overview below lists the vehicles that are stored in our data for this part number.

• Honda CR-V 4 RM (2012-2018)

On the one hand, compare the part number on the label of the removed unit with this page. This only tells you that it is the right unit, and no more. On the other hand, have the fault memory read out before removal. Only the 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-T0A-3070-M4, 77960-T0A-A012-M1, 77960-T0A-A013-M1, 77960-T0A-A210-M1, 77960-T0A-A212-M1, 77960-T0A-A230-M1.

How does the repair of the 77960-T0N-U910-M4 work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery and only now remove the control unit. Afterwards create a repair order online and send in the well-packed unit.

This sequence is followed for safety reasons and is therefore mandatory. Once the unit is removed, the next step is sending it to Airbag24.

Airbag24 tests the unit on the test bench, replaces defective components and erases stored crash data. A function test follows. Processing usually takes 3–4 working days, and this period applies only to checking, repairing and testing at Airbag24. 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-T0N-U910-M4 get to Airbag24?

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

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