Airbag control unit with part number 77960-T2A-M550-M1

What does the airbag control unit 77960-T2A-M550-M1 do?

The 77960-T2A-M550-M1 is the airbag control unit that controls the airbags and seatbelt pretensioners in the restraint system (SRS) of Honda. It processes sensor signals, decides within milliseconds in the event of a crash and monitors the system continuously. It shows faults via the airbag warning light.

The sensor data is received continuously by the control unit.

After an accident, crash data is stored and the unit locks itself.

Why does the control unit 77960-T2A-M550-M1 fail?

Crash data is the most common cause for the 77960-T2A-M550-M1: it arises after an accident, even if no airbag has deployed, and a normal diagnostic tool cannot erase it. Other causes include ageing electronics, cold solder joints, moisture and corrosion on plug connections, and voltage spikes, for example from jump-starting.

The crash data is the starting point if the unit has been involved in an accident in its history.

Ageing components and cold solder joints can only show under load; this is exactly where they differ from a fault that appears immediately.

Moisture and corrosion attack the plug connections, and voltage spikes additionally affect the electronics.

How can you tell that the 77960-T2A-M550-M1 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently if something is wrong with the 77960-T2A-M550-M1. In addition there may be an error message, a diagnostic tool with no connection and a fault memory that cannot be cleared. In this state, airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light shows the fault directly and should be taken seriously.

If the light stays on permanently or an error message appears, have the system checked promptly.

Which vehicles is the 77960-T2A-M550-M1 fitted in?

The 77960-T2A-M550-M1 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018). Compare your model with this information before you remove anything.

These models are assigned to this part number:

• Honda CR-V 4 RM (2012-2018)

Comparing the label with this page shows whether you have the right unit, nothing more. Whether the control unit is defective or whether plugs or cables are the cause is revealed by the fault memory read out beforehand.

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-M550-M1 work?

For the 77960-T2A-M550-M1, first have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Next, create a repair order online; processing at Airbag24 usually takes 3–4 working days.

Airbag24 examines the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. Your own unit is then returned to you.

The stated time applies only to checking, repairing and testing at Airbag24. 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-M550-M1 get to Airbag24?

You send the control unit 77960-T2A-M550-M1 as a parcel or book UPS collection for an extra charge. After the repair, UPS takes care of the return shipment.

Put the printed repair order into the parcel, and pack the unit securely against impact.