Airbag control unit with part number 77960-TF0-H621-M3

What does the airbag control unit 77960-TF0-H621-M3 do?

The central control unit of the restraint system (SRS) in Honda is the airbag control unit 77960-TF0-H621-M3. It evaluates the sensors and, in a crash, decides within milliseconds which airbags and seatbelt pretensioners to fire, while continuously monitoring the system.

During operation it checks the connected components and stores any faults it finds in the fault memory. The airbag warning light comes on when necessary.

In a crash the unit stores crash data and locks itself, and only repair releases the lock again.

Why does the control unit 77960-TF0-H621-M3 fail?

Stored crash data from an accident is considered the most common cause with 77960-TF0-H621-M3, even if no airbag has fired. Other causes are aged electronics, cold solder joints, moisture and corrosion on plug connections, and voltage spikes, for example from weak batteries or jump-starting.

A standard diagnostic tool cannot remove this crash data. Airbag24 takes care of the erasure as part of the repair.

Which trigger applies in an individual case only testing will show. A cable or a contact with corrosion can cause faults just as a defective component can.

How can you tell that the 77960-TF0-H621-M3 is defective?

A defect on the 77960-TF0-H621-M3 shows when the airbag warning light in the instrument cluster lights up, sometimes permanently, sometimes intermittently, a fault message appears in the display, or the diagnostic tool cannot establish a connection. The fault memory then cannot be emptied. In this state, airbags and seatbelt pretensioners may not trigger in an emergency.

Typical signs at a glance:

• Airbag warning light coming on, sometimes permanently, sometimes intermittently
• Fault message in the instrument cluster
• No connection between diagnostic tool and control unit
• Fault memory that cannot be cleared

The light shows the finding in the instrument cluster itself, so it must be taken seriously.

Which vehicles is the 77960-TF0-H621-M3 fitted in?

The airbag control unit 77960-TF0-H621-M3 is fitted in these vehicles: Honda Jazz GE (2008-2015).

The list of vehicles for this part number follows below.

• Honda Jazz GE (2008-2015)

A label comparison on the removed unit shows whether it is the right one. Whether the control unit itself is defective is shown only by the fault memory, which you have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 5WK43461, 77960-TF0-E820-M3, 77960-TF0-E821-M3, 77960-TF0-E832-M3, 77960-TF0-E840-M3, 77960-TF0-G820-M3.

How does the repair of the 77960-TF0-H621-M3 work?

You have the fault memory of the 77960-TF0-H621-M3 read first and enclose the log with the unit. Then you disconnect the battery, remove the control unit and send it in well packed after creating the repair order online. Processing at Airbag24 usually takes 3–4 working days.

The unit goes through the test bench check at Airbag24: defective components are replaced, crash data erased. A function test concludes the work, then your own unit is returned.

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-H621-M3 get to Airbag24?

Either you send the control unit 77960-TF0-H621-M3 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

You put the printed repair order into the parcel, and you pack the unit shock-proof.