Airbag control unit with part number 77960-T0A-S812-M1

What does the airbag control unit 77960-T0A-S812-M1 do?

The airbag control unit 77960-T0A-S812-M1 belongs to the restraint system (SRS) of Honda and controls it. It evaluates the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system without interruption. After an accident it stores crash data and locks itself.

Fault messages appear via the airbag warning light. Monitoring runs in the background as soon as the ignition is on.

Why does the control unit 77960-T0A-S812-M1 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. A standard diagnostic tool cannot delete it. Aged components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes are also possible.

Crash data is created in the control unit itself. Reading it out displays it but does not remove it, which is why a simple reset does not help.

The other triggers are ageing of the electronics and environmental influences at the contacts. A weak battery or a jump start can additionally cause voltage spikes that load the unit.

How can you tell that the 77960-T0A-S812-M1 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently, a message appears in the instrument cluster, the diagnostic tool cannot reach the control unit, or the fault memory cannot be cleared. In that case airbags and seatbelt pretensioners may not trigger in an emergency.

The warning light is the sign you will notice first. It indicates the fault as soon as the system recognises it, and it should go out again after the ignition is switched on.

If a display stays on, have the restraint system checked before you continue to drive with the fault.

Which vehicles is the 77960-T0A-S812-M1 fitted in?

The airbag control unit 77960-T0A-S812-M1 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018).

The assignment at a glance:

• 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 it is the correct unit. Also have the fault memory read out beforehand, because only the 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-S812-M1 work?

You first read out the fault memory and enclose the log, then disconnect the battery and only then remove the control unit. Online you create the repair order and send the unit in well packed. Airbag24 checks it, replaces defective components, deletes crash data and tests the function; processing usually takes 3–4 working days.

The order at the start protects you during removal, because the system must be de-energised beforehand.

After the check, the repair and 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-S812-M1 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS, and the printed repair order goes into the parcel.

Pack the control unit shock-proof so that it passes the journey undamaged.