Airbag control unit with part number 77960-TF0-H640-M3

What does the airbag control unit 77960-TF0-H640-M3 do?

Within the restraint system (SRS) of Honda, the airbag control unit 77960-TF0-H640-M3 forms the central evaluation unit. Using the crash sensors it determines in an accident which airbags and which seatbelt pretensioners are triggered, within milliseconds.

While driving it monitors the system permanently. It passes on any faults it finds to the driver via the airbag warning light.

After an accident it writes crash data to memory and locks itself.

Why does the control unit 77960-TF0-H640-M3 fail?

The most common cause is a stored crash data record from an accident, which need not have led to any airbag triggering. In addition, aged components, cold solder joints, wetness at the plugs and voltage spikes may be considered.

Crash data remains in the unit and cannot be removed with a normal diagnostic tool.

Aged components and cold solder joints are typical weak points of electronics. Wetness at the plugs promotes corrosion, and voltage spikes occur, for example, with a weak battery or when starting with an external power source.

Which of these causes is actually present is only shown by reading out the fault memory.

How can you tell that the 77960-TF0-H640-M3 is defective?

A defect shows itself through an airbag warning light that stays on permanently or intermittently, through a fault message in the instrument cluster, through a missing connection to the diagnostic tool and through a fault memory that cannot be cleared.

The warning light is a sign that must be taken seriously. As long as the fault persists, airbags and seatbelt pretensioners may not trigger in an emergency.

Whether the control unit itself or the wiring is affected can only be determined by an examination.

Which vehicles is the 77960-TF0-H640-M3 fitted in?

The 77960-TF0-H640-M3 is fitted in these vehicles: Honda Jazz GE (2008-2015).

The vehicles at a glance:

• Honda Jazz GE (2008-2015)

Comparing the part number on the label with this page only confirms that you have removed the correct unit. Having the fault memory read out remains separately important, because only this result shows whether the control unit is defective 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-H640-M3 work?

Have the fault memory read out and enclose the log. Then disconnect the battery and remove the control unit. Next create a repair order online and send in the well-packed unit.

Airbag24 checks the unit on the test bench, repairs defective components, deletes the crash data and carries out a function test. Airbag24 typically plans 3–4 working days for checking, repairing and testing.

Afterwards your own 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-H640-M3 get to Airbag24?

You send the unit as a parcel or take up the UPS collection service for an extra charge. After the repair UPS brings the unit back to you.

The printed repair order belongs in the parcel. Pack the control unit shock-proof.