Airbag control unit with part number 77960-T2A-N030-M1

What does the airbag control unit 77960-T2A-N030-M1 do?

The airbag control unit 77960-T2A-N030-M1 is the central control unit of the restraint system (SRS) of Honda. It evaluates the signals from the crash sensors, decides within milliseconds in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It reports faults via the airbag warning light.

In operation, the control unit checks whether all connected components respond and whether their measured values are plausible. This self-check runs independently of the driver.

After an accident, the unit stores crash data and locks itself. Further details do not belong in the description of the function.

Why does the control unit 77960-T2A-N030-M1 fail?

Most common cause: crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase this crash data. 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.

Crash data is created when the unit registers an event. It stays in memory until it is specifically processed, and the normal diagnostic tool does not reach it.

The other causes include ageing of the electronics: over time, components lose precision. Cold solder joints can cause intermittent contacts. Moisture and corrosion at plug connections worsen the flow of current.

Voltage spikes occur above all when the battery is weak or the vehicle is started with external power. Such fluctuations noticeably stress the electronics.

How can you tell that the 77960-T2A-N030-M1 is defective?

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

The airbag warning light is the signal you should watch first. It indicates a detected fault as soon as the system notices it, and it stays on until the cause is removed.

Any one of these abnormalities justifies a check. You do not have to wait until several signs appear at the same time.

Which vehicles is the 77960-T2A-N030-M1 fitted in?

The control unit 77960-T2A-N030-M1 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018).

The overview here comes from our data for this part number and shows the vehicles stored there.

• 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 ensures that you have the right unit. On the other hand, have the fault memory read out before removal. Only this log 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-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-T2A-N030-M1 work?

First have the fault memory read out and enclose the log. Then disconnect the battery, and only then remove the control unit. Next, create a repair order online and send the unit in well packed.

This sequence must be followed for safety reasons and allows no shortcut. Removal begins only once the log and the disconnected battery are in place.

Airbag24 tests the unit on the test bench, replaces defective components and erases stored crash data. A function test concludes the work. Processing usually takes 3–4 working days, counted only for 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-T2A-N030-M1 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit by UPS.

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