Airbag control unit with part number 77960-T2A-B912-M1

What does the airbag control unit 77960-T2A-B912-M1 do?

The airbag control unit 77960-T2A-B912-M1 controls the restraint system of Honda. It evaluates the signals from the crash sensors, decides in the event of an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the entire system during operation. After an accident it stores crash data and locks itself.

During normal operation the unit checks the connected components continuously for faults. A detected fault is stored in the fault memory and shown via the airbag warning light in the instrument cluster.

The crash data describe the course of the event and remain stored in the control unit.

Why does the control unit 77960-T2A-B912-M1 fail?

The most common cause is crash data stored after an accident, even if no airbag has triggered; a normal diagnostic tool cannot erase them. Further causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, as well as voltage spikes, for example from a weak battery or jump-starting.

Crash data arises as soon as the control unit records an accident event. A normal diagnostic tool cannot remove it, and the fault remains even though the car drives normally again.

The other causes concern the electronics over time. Aged components, cold solder joints and moisture at plug connections are among them, as are voltage spikes from the vehicle electrical system.

How can you tell that the 77960-T2A-B912-M1 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. The diagnostic tool cannot find the control unit, and a fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The airbag warning light in the instrument cluster indicates that the control unit has detected a fault. It can light up permanently or only intermittently, and in both cases action is needed.

A fault message in the instrument cluster and a diagnostic tool with no connection to the control unit are further signs. A fault memory that cannot be cleared confirms the suspicion.

Which vehicles is the 77960-T2A-B912-M1 fitted in?

The airbag control unit 77960-T2A-B912-M1 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018). The part number only tells you which unit it is, not whether it is defective.

Here are the vehicles recorded for this part number. Use the list to check whether your car is among them.

• Honda CR-V 4 RM (2012-2018)

Compare the part number on the label of the removed unit with this page. This only shows that it is the correct unit. Have the fault memory read out beforehand, because only the log shows 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-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-B912-M1 work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit. Then create a repair order online and send the unit in well packed. Airbag24 examines it, repairs defective components, erases stored crash data and carries out a function test.

You keep to the order: the readout first, then the battery, and the removal last. The log is enclosed with the order.

Create the repair order online, and pack the unit well before sending it in.

At Airbag24 the unit is examined on the test bench and defective components are repaired. Stored crash data is erased, then the function test follows. Processing at Airbag24 usually takes 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-T2A-B912-M1 get to Airbag24?

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

Place the printed repair order in the parcel and pack the control unit shockproof.