Airbag control unit with part number 77960-T0A-H920-M4

What does the airbag control unit 77960-T0A-H920-M4 do?

The control unit 77960-T0A-H920-M4 belongs to the restraint system (SRS) of Honda and is its central control unit. It evaluates the signals from the crash sensors and decides in an accident which airbags and seatbelt pretensioners are triggered.

The evaluation takes only fractions of a second. In addition, it monitors the system continuously.

If it detects a fault, it reports this via the airbag warning light in the instrument cluster. After an accident it stores crash data and locks itself.

Why does the control unit 77960-T0A-H920-M4 fail?

Stored crash data is the most common cause, even if no airbag has deployed. Other causes are ageing electronics, cold solder joints, moisture at plug connections and voltage spikes.

The crash data remains stored in the unit, and a standard diagnostic tool cannot remove it.

Ageing electronic components and cold solder joints affect the function because contacts become unreliable. Moisture and corrosion at plug connections have the same effect.

Voltage spikes, for example from a weak battery or jump-starting, damage the electronics.

How can you tell that the 77960-T0A-H920-M4 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently as soon as a fault is present in the 77960-T0A-H920-M4. At the same time a fault message appears, and the diagnostic tool finds no connection to the control unit.

The fault memory also cannot be cleared, which strengthens the suspicion of a defect. Please take these signs seriously.

As long as the fault persists, airbags and seatbelt pretensioners may not trigger in an emergency.

Which vehicles is the 77960-T0A-H920-M4 fitted in?

The list belongs to the part number 77960-T0A-H920-M4. The control unit is fitted in these vehicles: Honda CR-V 4 RM (2012-2018).

The individual vehicles are listed here:

• Honda CR-V 4 RM (2012-2018)

Compare the part number on the label of the removed unit with this page to make sure it is the correct unit. Have the fault memory read out beforehand. Only this 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 5WK43782, 77960-SWA-G212-M4, 77960-SWA-G214-M4, 77960-T1G-G920-M4.

How does the repair of the 77960-T0A-H920-M4 work?

At Airbag24, testing, repair and function test usually take 3–4 working days. During this time Airbag24 replaces defective components and deletes the stored crash data.

You read out the fault memory and enclose the log. Then you disconnect the battery and remove the control unit.

Next you create the repair order online and send the unit well packed. After the function test, your own unit is returned 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-T0A-H920-M4 get to Airbag24?

You send the control unit 77960-T0A-H920-M4 as a parcel or book a UPS collection for an extra charge. The return of the repaired unit is made by UPS.

Place the printed repair order in the parcel. Pack the unit shock-proof, and it will arrive undamaged.