Airbag control unit with part number 77960-T0A-P830-M4

What does the airbag control unit 77960-T0A-P830-M4 do?

The 77960-T0A-P830-M4 is the airbag control unit of the restraint system (SRS) at Honda. It processes the measurements from the crash sensors, decides in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the entire system. It indicates faults via the airbag warning light.

The decision is made in an instant, leaving no time for queries.

After an accident the unit writes crash data to its memory and then locks itself.

Why does the control unit 77960-T0A-P830-M4 fail?

On the 77960-T0A-P830-M4 the most common cause is an entry with crash data from an accident, even if no airbag was triggered; a standard diagnostic tool cannot remove it. Other causes are aged components, cold solder joints, moisture and corrosion on contacts, and voltage spikes from jump starts or a weak battery.

The data is created in the unit itself, and Airbag24 removes it during the repair.

The other causes concern the electronics and their environment. Aged components, cold solder joints and corrosion on plugs impair the signal flow, while voltage spikes load the circuits.

How can you tell that the 77960-T0A-P830-M4 is defective?

On the 77960-T0A-P830-M4 the defect first appears as an indication: the airbag warning light in the instrument cluster lights up constantly or intermittently. Added to this are an error message, a diagnostic tool without connection, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

The airbag warning light in the instrument cluster is the first signal you should heed, because it reports the fault itself.

If the diagnostic tool does not connect to the control unit, or the fault memory cannot be emptied, this points to a problem in the safety system that has to be checked.

Which vehicles is the 77960-T0A-P830-M4 fitted in?

This control unit was fitted in several Honda models. The 77960-T0A-P830-M4 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018).

The stored vehicles are listed here:

• Honda CR-V 4 RM (2012-2018)

On the one hand, compare the part number on the removed label with this page; this only confirms the correct unit. On the other hand, it is worth having the fault memory read out before removal, because it shows whether the control unit itself or a plug or cable is the problem.

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-P830-M4 work?

First have the fault memory read out and the log enclosed. Then disconnect the battery and only afterwards remove the 77960-T0A-P830-M4; the repair order follows online before you send the unit in. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the control unit is checked, defective components are replaced, and stored crash data is deleted. Then the function test and the return of your own unit follow.

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-P830-M4 get to Airbag24?

You send the 77960-T0A-P830-M4 to Airbag24 as a parcel, or book a UPS collection for an extra charge. The return after the repair is also made by UPS.

The printed repair order belongs in the parcel. Pack the unit shock-proof so that it arrives undamaged.