Airbag control unit with part number 77960-TF0-U640-M3

What does the airbag control unit 77960-TF0-U640-M3 do?

The 77960-TF0-U640-M3 is the control unit of the airbag system in Honda vehicles. It checks the signals from the crash sensors and decides in an accident which airbags and seatbelt pretensioners are triggered.

The evaluation takes place within milliseconds, and the system is monitored throughout.

Faults appear via the airbag warning light. In an accident the unit stores crash data and locks itself.

Why does the control unit 77960-TF0-U640-M3 fail?

Stored crash data is the most common cause of the control unit 77960-TF0-U640-M3 failing, even without a triggered airbag. A normal diagnostic tool cannot remove it. In addition, aged components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes can cause the failure.

The crash data remains in the unit after the accident, and ordinary diagnostics cannot remove it.

The other causes lie in the electronics and the connections. Moisture and corrosion damage contacts, and voltage spikes, for example from a weak battery or a jump start, put strain on the unit.

How can you tell that the 77960-TF0-U640-M3 is defective?

The airbag warning light in the instrument cluster reports a defect on the 77960-TF0-U640-M3 when it lights up permanently or intermittently. Added to this are a fault message, no connection to the diagnostic tool, or a fault memory that cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then not deploy.

The warning light is therefore a clear sign that the system must be checked.

Which vehicles is the 77960-TF0-U640-M3 fitted in?

The 77960-TF0-U640-M3 is fitted in these vehicles: Honda Jazz GE (2008-2015).

Here are the vehicles to which this part number is assigned:

• Honda Jazz GE (2008-2015)

Compare the part number on the label of your removed unit with this page; this only confirms that you have the correct unit. Have the fault memory read out beforehand. Only this finding shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 5WK43461, 77960-SAA-G821-M1, 77960-SEG-G821-M1, 77960-TF0-G820-M3, 77960-TF0-G821.

How does the repair of the 77960-TF0-U640-M3 work?

You read out the fault memory first, disconnect the battery and only then remove the 77960-TF0-U640-M3. At Airbag24, inspection, repair and function test normally take 3–4 working days.

Then create a repair order online, pack the unit and send it in.

Airbag24 checks the unit on the test bench, replaces defective components, erases the 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-TF0-U640-M3 get to Airbag24?

The control unit 77960-TF0-U640-M3 reaches Airbag24 as a parcel or through a UPS collection, which is booked for an extra charge.

After the repair, Airbag24 returns the unit by UPS. The printed repair order goes into the parcel, and the unit must be packed shockproof.