Airbag control unit with part number 77960-TF0-H440-M3

What does the airbag control unit 77960-TF0-H440-M3 do?

The 77960-TF0-H440-M3 controls the airbags and seatbelt pretensioners in the vehicle of Honda. It evaluates the crash sensors, decides on triggering within milliseconds in a crash, and monitors the entire restraint system continuously. It shows faults via the airbag warning light.

Triggering is the most important task of the control unit. To do this, it combines the signals from several crash sensors and controls the airbags and seatbelt pretensioners that suit the situation. A fault in the system is recorded in the fault memory.

After an accident the control unit stores crash data and locks itself. The airbag warning light then draws attention to this state.

Why does the control unit 77960-TF0-H440-M3 fail?

The most common cause for the 77960-TF0-H440-M3 is crash data stored after an accident, even without a triggered airbag. In addition, aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting, can cause failure.

Crash data remains stored because a standard diagnostic tool cannot remove it. The fault then continues to show on the display, even if the other functions work. Airbag24 clears the crash data during the repair.

Load peaks in the vehicle electrical system, for example with a weak battery or after jump-starting, put strain on the electronics. Ageing, heat and moisture act slowly on solder joints and plug contacts. Only the fault memory shows which cause applies in the individual case.

How can you tell that the 77960-TF0-H440-M3 is defective?

You can recognise a defect in the 77960-TF0-H440-M3 by the airbag warning light in the instrument cluster when it stays on permanently or intermittently, by an error message in the instrument cluster, by a diagnostic tool without connection to the control unit, or by a fault memory that you cannot clear.

The warning light is the clearest sign, because it draws attention even when the vehicle feels normal. If an error message also appears in the instrument cluster, the fault is clearly identifiable. In that case the diagnostic tool cannot reach the control unit, or the fault memory stays in place even after you try to clear it.

Such a finding requires a prompt check. In an emergency, airbags and seatbelt pretensioners may fail to deploy.

Which vehicles is the 77960-TF0-H440-M3 fitted in?

The control unit 77960-TF0-H440-M3 is fitted in these vehicles: Honda Jazz GE (2008-2015).

The list shows the vehicles that Airbag24 assigns to this part number.

• Honda Jazz GE (2008-2015)

Comparing the part number on the label of the removed unit with this page ensures that you have the correct unit. Have the fault memory read out beforehand, because only this result shows whether the control unit 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-H440-M3 work?

You have the fault memory of the 77960-TF0-H440-M3 read out and enclose the log. Then disconnect the battery, remove the control unit and create a repair order online.

Pack the unit well and send it in. Only then does the processing begin at Airbag24. There the unit is examined on the test bench, defective components are replaced, the stored crash data is cleared and a function test follows.

Processing at Airbag24 usually takes 3–4 working days. Afterwards your own unit is returned 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-H440-M3 get to Airbag24?

You can send the control unit 77960-TF0-H440-M3 in as a package, or book a UPS collection for an extra charge. Airbag24 returns it by UPS after the repair.

Enclose the printed repair order with the package, and the unit should be packed shock-proof.