Airbag control unit with part number 77960-TF0-Q840-M3

What does the airbag control unit 77960-TF0-Q840-M3 do?

The airbag control unit 77960-TF0-Q840-M3 is the central control unit of the restraint system (SRS) of Honda. It evaluates the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The unit signals faults via the airbag warning light in the instrument cluster, so that a malfunction becomes visible to you.

After an accident the control unit stores crash data and locks itself. Only the repair of the unit lifts this lock.

Why does the control unit 77960-TF0-Q840-M3 fail?

The most common cause is stored crash data: even without a deployed airbag, it remains in the unit after an accident, and a normal diagnostic tool cannot remove it. Other causes include aged components, cold solder joints, moisture at plug connections and voltage spikes.

The crash data are the result of an impact recorded by the control unit. On their own they do not fully explain the failure, which is why the fault memory must always be considered as well.

Electronic components age over a long period, and solder joints can give way with the years. Moisture, in turn, attacks the contacts and causes corrosion that disturbs the signal flow.

Voltage spikes, on the other hand, occur suddenly, for example when the battery is weak or a vehicle is started with jump leads. They load the electronics directly.

How can you tell that the 77960-TF0-Q840-M3 is defective?

A defect shows up as an airbag warning light that stays on permanently or intermittently, as a fault message in the instrument cluster, or as a diagnostic tool that cannot establish a connection to the control unit. A fault memory that cannot be cleared also belongs here. In an emergency, airbags and seatbelt pretensioners may then possibly not deploy.

The signs are unambiguous and need no interpretation. If one of them occurs, have the system examined.

Which vehicles is the 77960-TF0-Q840-M3 fitted in?

The control unit 77960-TF0-Q840-M3 is fitted in these vehicles: Honda Jazz GE (2008-2015).

Here you will find the vehicles known to us for this part number.

• Honda Jazz GE (2008-2015)

Compare the part number on the label of the removed unit with this page. This shows whether it is the correct unit. Then have the fault memory read out, because this result shows whether the control unit is defective or 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-Q840-M3 work?

First read out the fault memory and attach the log. Then disconnect the battery, and only then remove the control unit. Next, create a repair order online and send the well-packed unit in. Airbag24 checks it on the test bench, replaces defective components, deletes the crash data and carries out a function test.

Processing at Airbag24 usually takes 3–4 working days. This time covers only checking, repairing and testing in-house.

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-Q840-M3 get to Airbag24?

Send the control unit 77960-TF0-Q840-M3 to Airbag24 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit by UPS.

Enclose the printed repair order in the parcel and pack the unit shockproof.