Airbag control unit with part number 77960-TF0-Q821-M3

What does the airbag control unit 77960-TF0-Q821-M3 do?

As the central unit of the SRS for Honda, the airbag control unit 77960-TF0-Q821-M3 evaluates the signals from the crash sensors. In an emergency it decides within milliseconds which airbags and seatbelt pretensioners are triggered, and it monitors the entire system constantly.

The unit reports a fault via the airbag warning light in the instrument cluster. If an accident has occurred, it stores crash data and then locks itself. You will find more on this in the question about the causes.

Why does the control unit 77960-TF0-Q821-M3 fail?

The most common cause in the 77960-TF0-Q821-M3 is crash data stored after an accident, even if no airbag was triggered. Added to this are aged components, cold solder joints, moisture or corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

An ordinary diagnostic tool does not remove crash data from the memory. At Airbag24, the data is erased during the repair.

Electronic components age, even on the control unit itself. Solder joints can loosen over time, and moisture or corrosion at plugs leads to contact problems.

How can you tell that the 77960-TF0-Q821-M3 is defective?

The airbag warning light in the instrument cluster indicates a defect on the 77960-TF0-Q821-M3 by lighting up permanently or intermittently. This is accompanied by an error message in the instrument cluster, a missing connection from the diagnostic tool to the control unit, and a fault memory that cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may not be triggered in the event of such a defect. A timely check helps to narrow down the problem.

The warning light is therefore the signal you must take seriously.

Which vehicles is the 77960-TF0-Q821-M3 fitted in?

The overview below shows which models belong to the part number. The control unit 77960-TF0-Q821-M3 is fitted in these vehicles: Honda Jazz GE (2008-2015).

The list of vehicles looks like this:

• Honda Jazz GE (2008-2015)

First compare the part number on the label of the removed unit with this page, so that you can see whether it is the right unit. The fault memory should also be read out beforehand, because only it shows whether the control unit is defective or whether a plug or a 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-Q821-M3 work?

Have the fault memory read out first and enclose the log with the unit; then disconnect the battery and only then remove the control unit 77960-TF0-Q821-M3. Create the repair order online and send in the well-packed unit. At Airbag24, processing usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, deletes the crash data and carries out a function test. Then the 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-Q821-M3 get to Airbag24?

The 77960-TF0-Q821-M3 reaches Airbag24 as a parcel, or you book a UPS collection for an extra charge. The return after the repair is made by UPS.

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