Airbag control unit with part number 77960-T0A-Q910-M4

What does the airbag control unit 77960-T0A-Q910-M4 do?

The airbag control unit 77960-T0A-Q910-M4 is the central control unit of the restraint system (SRS) in Honda. It evaluates the crash sensors and decides in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered.

Outside of an accident the unit monitors the entire system continuously. If it detects a fault, it stores it in the fault memory and shows it via the airbag warning light in the instrument cluster.

After an accident the control unit stores crash data and locks itself. A failure therefore directly affects the protective effect of the airbags and seatbelt pretensioners.

Why does the control unit 77960-T0A-Q910-M4 fail?

The most common cause for 77960-T0A-Q910-M4 is crash data stored after an accident, even when no airbag has deployed. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Stored crash data cannot be erased with a normal diagnostic tool. Airbag24 removes it during the repair.

Ageing electronic components and cold solder joints lead to faults in the same way as moisture and corrosion on the plugs.

Voltage spikes, for example from a weak battery or when jump-starting, are a further cause.

How can you tell that the 77960-T0A-Q910-M4 is defective?

A defect in the 77960-T0A-Q910-M4 can be recognised by the airbag warning light in the instrument cluster, which lights up permanently or intermittently. A fault message, a missing connection to the diagnostic tool and a fault memory that cannot be cleared are further signs.

The warning light shows the defect. As long as it is lit, airbags and seatbelt pretensioners may not deploy in an emergency. A check should not be postponed, because the system does not work reliably in this state.

Which vehicles is the 77960-T0A-Q910-M4 fitted in?

The control unit 77960-T0A-Q910-M4 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018).

The list of assigned vehicles follows here:

• Honda CR-V 4 RM (2012-2018)

Compare the part number on the label of the removed unit with this page; this only ensures that you have the correct unit. Also have the fault memory read out beforehand, because only this result 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 5WK43782, 77960-SWA-G212-M4, 77960-SWA-G214-M4, 77960-T1G-G920-M4.

How does the repair of the 77960-T0A-Q910-M4 work?

For 77960-T0A-Q910-M4, have the fault memory read out, remove the control unit after disconnecting the battery, and send it in with an online repair order. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases the crash data and carries out a function test. Afterwards your own unit goes back to you.

The order of the steps is binding for safety reasons. 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-Q910-M4 get to Airbag24?

You send the control unit 77960-T0A-Q910-M4 as a parcel or have it collected by UPS for an extra charge. Airbag24 sends the repaired unit back by UPS afterwards.

The printed repair order goes into the parcel, and the unit is packed shockproof.