Airbag control unit with part number 77960-TF0-U620-M3

What does the airbag control unit 77960-TF0-U620-M3 do?

The airbag control unit 77960-TF0-U620-M3 controls the restraint system (SRS) for Honda and is its central unit. It receives the values from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners respond.

Outside an accident it continuously checks whether all components of the system are working. It reports faults found via the airbag warning light in the instrument cluster.

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

Why does the control unit 77960-TF0-U620-M3 fail?

The most common cause is stored crash data, even if no airbag has triggered. A normal diagnostic tool does not remove it from the 77960-TF0-U620-M3. Other triggers are aged components, cold solder joints, moisture at plug connections and voltage spikes.

The other causes can be summarised as follows:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

Airbag24 erases the crash data during the repair.

How can you tell that the 77960-TF0-U620-M3 is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, and through an error message in the instrument cluster. In addition the diagnostic tool finds no connection to the control unit 77960-TF0-U620-M3, and the fault memory remains.

The warning light is the first sign you will notice. A fault memory that cannot be cleared also belongs among the signs and calls for clarification.

In an emergency, airbags and seatbelt pretensioners may then not trigger. Therefore arrange a check as soon as one of these signs appears.

Which vehicles is the 77960-TF0-U620-M3 fitted in?

The 77960-TF0-U620-M3 is fitted in these vehicles: Honda Jazz GE (2008-2015). The assignment results from the part number of the unit.

This overview lists the assigned vehicles:

• Honda Jazz GE (2008-2015)

Comparing the part number on the label of the removed unit with this page only ensures that it is the right unit. Also have the fault memory read out beforehand, because only that shows whether the control unit is defective or whether a connector 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-U620-M3 work?

At the start the fault memory is read out, and the log is part of it. Then you disconnect the battery and only then remove the control unit 77960-TF0-U620-M3. Airbag24 usually needs 3–4 working days for the testing, the repair and the functional test.

Then create the repair order online and pack the unit well before sending it to Airbag24.

Airbag24 examines the unit on the test bench, renews defective components, erases the stored crash data and tests the function. Afterwards your own unit goes back. 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-U620-M3 get to Airbag24?

You send the control unit 77960-TF0-U620-M3 to Airbag24 as a parcel, or alternatively book a UPS collection for an extra charge. The return to you after the repair is made by UPS.

The printed repair order belongs in the parcel, and the unit should be packed shockproof.