Airbag control unit with part number 77960-T5A-J512-M2

What does the airbag control unit 77960-T5A-J512-M2 do?

The 77960-T5A-J512-M2 is the airbag control unit for the restraint system (SRS) of Honda. It processes the signals from the crash sensors, determines the deployment of airbags and seatbelt pretensioners within fractions of a second in the event of an accident, and monitors the system continuously. It reports faults via the airbag warning light; after an accident it stores crash data and locks itself.

In normal driving the device works unnoticed in the background. Its role only becomes apparent in an emergency, and then the decision must be right.

For this reason it is one of the components where a fault has to be taken seriously.

Why does the control unit 77960-T5A-J512-M2 fail?

The most common cause is crash data stored on the 77960-T5A-J512-M2 after an accident, even if no airbag was deployed; a normal diagnostic tool cannot erase them. Aged electronic components, cold solder joints, moisture and corrosion on plugs, and voltage spikes also play a part.

Crash data are the traces of an accident in the control unit. They remain stored after the accident, which is why it is likely that an accident lies far back and still has consequences.

The other causes concern the electronics in everyday use. Components age, solder joints can become weak, and moisture travels through plugs to the contacts.

Voltage spikes arise, for example, from a weak battery or when starting with external power, and put additional strain on the electronics.

How can you tell that the 77960-T5A-J512-M2 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, an error message appears in the instrument cluster, the diagnostic tool cannot find the control unit, or the fault memory cannot be cleared. In these cases the airbags and seatbelt pretensioners may not be able to deploy in an emergency. This applies to the 77960-T5A-J512-M2 in the same way.

The airbag warning light is the first sign you notice. It lights up briefly when you switch on and then goes out; if it stays on or comes back while driving, there is a fault.

A missing connection to the diagnostic tool is another sign that matches the warning light. Here too the control unit itself need not be the cause, because wires and plugs are also possible.

Which vehicles is the 77960-T5A-J512-M2 fitted in?

The control unit 77960-T5A-J512-M2 is fitted in these vehicles: Honda Jazz GK (2013-2023).

The list of vehicles follows here:

• Honda Jazz GK (2013-2023)

Compare the part number on the label of the removed unit with this page; this only ensures that you have the right unit. Have the fault memory read out before removal, because only this result shows whether the control unit is defective or whether a plug or cable is the cause. The label comparison does not clarify the cause.

For the same vehicles, we also repair control units with the part numbers 77960-T5A-A212-M1, 77960-T5A-E010-M1, 77960-T5A-E011-M1, 77960-T5A-E020-M1, 77960-T5A-F010-M1, 77960-T5A-F011-M1.

How does the repair of the 77960-T5A-J512-M2 work?

The process for the 77960-T5A-J512-M2 begins with you: have the fault memory read out and the log attached, disconnect the battery, and only then remove the control unit. Then create a repair order online and send the unit well packed. At Airbag24, processing usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components and carries out a function test.

You then receive your own unit 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-T5A-J512-M2 get to Airbag24?

You send the control unit 77960-T5A-J512-M2 as a parcel or arrange a UPS collection for an extra charge. Airbag24 returns it by UPS after the repair.

Put the printed repair order in the parcel and pack the unit shock-proof.