Airbag control unit with part number 77960-TLA-F040-M4

What does the airbag control unit 77960-TLA-F040-M4 do?

The airbag control unit 77960-TLA-F040-M4 is the control unit of the restraint system (SRS) for Honda. It processes the signals from the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

Faults that are found are shown by the control unit via the airbag warning light in the instrument cluster. The light thus connects the system with the driver.

After an accident the unit stores crash data and locks itself.

Why does the control unit 77960-TLA-F040-M4 fail?

Crash data stored after an accident are the most common cause with the 77960-TLA-F040-M4, even if no airbag has triggered. Aged electronics, cold solder joints, moisture and corrosion at plug connectors and voltage spikes also belong to the causes.

A normal diagnostic tool cannot erase the crash data. Airbag24 takes care of that during the repair.

Weak batteries and jump-starting can create voltage spikes that damage the unit. Moisture and corrosion at plugs also belong to this.

How can you tell that the 77960-TLA-F040-M4 is defective?

On the 77960-TLA-F040-M4, the airbag warning light in the instrument cluster lights up permanently or intermittently. At the same time the instrument cluster shows an error message, the diagnostic tool cannot reach the control unit, and the fault memory cannot be erased. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The light is the first sign you will notice. The system thus displays a fault and does not hide it.

Reading out the fault memory helps narrow down the cause.

Which vehicles is the 77960-TLA-F040-M4 fitted in?

The control unit 77960-TLA-F040-M4 is designed for Honda and is fitted in these vehicles: Honda CR-V 5 (2018-2023).

These models are summarised in the list:

• Honda CR-V 5 (2018-2023)

Comparing the part number on the label with this page shows whether you have removed the right unit. The comparison says nothing more. Whether the control unit is defective or a plug or cable causes the fault is shown only by the fault memory, which you have read out.

For the same vehicles, we also repair control units with the part numbers 5WK43782, 77960-SWA-G212-M4, 77960-SWA-G214-M4, 77960-SWAA-213-M1.

How does the repair of the 77960-TLA-F040-M4 work?

First read out the fault memory, attach the log and disconnect the battery. Processing at Airbag24, meaning inspection, repair and testing, usually takes 3–4 working days.

Only then remove the control unit 77960-TLA-F040-M4, create a repair order online and send the unit in well packed.

At Airbag24 the unit goes on the test bench. Defective components are replaced where needed, the crash data are erased, and a function test follows at the end.

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-TLA-F040-M4 get to Airbag24?

Your way to Airbag24 is by parcel or by UPS collection, which you book for an extra charge. Airbag24 handles the return by UPS.

The printed repair order goes into the parcel, and the control unit 77960-TLA-F040-M4 is packed shock-proof.