Airbag control unit with part number 77960-TLA-A240-M4

What does the airbag control unit 77960-TLA-A240-M4 do?

The airbag control unit 77960-TLA-A240-M4 forms the switching centre of the SRS in Honda vehicles. It checks the signals from the crash sensors, decides within milliseconds in an impact whether airbags and seatbelt pretensioners fire, and monitors the system permanently. It shows detected faults via the airbag warning light.

During operation, the unit checks the ignition circuits, the sensor connections and the power supply. Monitoring runs without interruption for as long as the ignition is on.

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

Why does the control unit 77960-TLA-A240-M4 fail?

Stored crash data is the most common cause with the 77960-TLA-A240-M4, even if no airbag has deployed. Other causes include aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes, for example from a weak battery or a jump start.

A normal diagnostic tool cannot erase these data. Airbag24 handles this during the repair.

The other causes lie in the electronics. Components age, and solder joints can turn cold. Moisture and corrosion impair the contact at the plugs, and voltage spikes stress the circuit.

How can you tell that the 77960-TLA-A240-M4 is defective?

The airbag warning light lights up permanently or intermittently, an error message appears in the instrument cluster, and the diagnostic tool gets no connection to the control unit. The fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not be triggered.

The warning light is the most important sign. If it does not go out after the ignition is switched on, have the system checked promptly.

Which vehicles is the 77960-TLA-A240-M4 fitted in?

The control unit 77960-TLA-A240-M4 is fitted in these vehicles: Honda CR-V 5 (2018-2023).

The vehicles to which Airbag24 assigns this control unit are listed here.

• Honda CR-V 5 (2018-2023)

Compare the part number on the label of the removed unit with this page; this only ensures that it is the right unit. Whether the control unit is defective or a plug or cable is the cause is shown only by the fault memory read out beforehand.

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-A240-M4 work?

First have the fault memory read out for the 77960-TLA-A240-M4 and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Next, create a repair order online and send the unit in. At Airbag24, checking, repairing and testing usually take 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards, your own unit goes back 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-TLA-A240-M4 get to Airbag24?

You send the 77960-TLA-A240-M4 off as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

The printed repair order belongs in the parcel, and the control unit is packed shock-proof.