Airbag control unit with part number 77960-TA0-L020-M4

What does the airbag control unit 77960-TA0-L020-M4 do?

The airbag control unit 77960-TA0-L020-M4 controls the restraint system (SRS) in Honda models. It processes the data from the crash sensors, decides within milliseconds in a collision which airbags and seatbelt pretensioners are triggered, and monitors the system in the background. Faults are reported via the airbag warning light.

The unit stores detected faults in the fault memory. Diagnostic tools read this memory.

After a collision it stores crash data and locks itself.

Why does the control unit 77960-TA0-L020-M4 fail?

Stored crash data is the most common cause, even when no airbag has deployed, and it cannot be erased with a normal diagnostic tool. In addition, aged components, cold solder joints, moisture and corrosion at connectors and voltage spikes play a role on the 77960-TA0-L020-M4.

The crash data remains stored after a collision until Airbag24 erases it during the repair.

The other causes mainly concern connections and components. Solder joints become brittle over time, moisture changes the contacts, and rust can impair plug connections. Voltage spikes place an additional load on the electronics.

How can you tell that the 77960-TA0-L020-M4 is defective?

The airbag warning light in the instrument cluster is the first sign: it lights up permanently or intermittently when something is wrong with the 77960-TA0-L020-M4. Fault messages in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be cleared may also occur. In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

The light is the direct signal from the control unit to you. A vehicle with a permanently lit warning should be checked promptly.

A diagnostic tool that cannot make a connection reinforces the suspicion.

Which vehicles is the 77960-TA0-L020-M4 fitted in?

The control unit 77960-TA0-L020-M4 is fitted in these vehicles: Honda Accord 8th generation (2008-2015). Comparing the part number on the label of the removed unit with this page confirms that it is the correct unit.

These vehicles are stored for the part number:

• Honda Accord 8th generation (2008-2015)

In addition: reading out the fault memory shows whether the control unit is defective or whether a plug or a cable is causing the fault.

For the same vehicles, we also repair control units with the part numbers 77960-S84-A86, 77960-TA0-A01, 77960-TA0-A011M4, 77960-TA0-A02, 77960-TA0-L02.

How does the repair of the 77960-TA0-L020-M4 work?

Your first step is reading out the fault memory, including the attached log. Then you disconnect the battery, and only after that is the 77960-TA0-L020-M4 removed. Next you create the repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

The sequence is fixed for safety reasons.

At Airbag24 the unit is checked, components are replaced where necessary and the crash data is erased. A function test follows before the 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-TA0-L020-M4 get to Airbag24?

Either you send the control unit 77960-TA0-L020-M4 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

The printed repair order goes in the parcel. Pack the unit shock-proof.