Airbag control unit with part number 77960-T5A-J820-M1

What does the airbag control unit 77960-T5A-J820-M1 do?

The airbag control unit 77960-T5A-J820-M1 is the central control unit of the restraint system (SRS) for Honda. It evaluates the signals from the crash sensors, decides in an accident whether airbags and seatbelt pretensioners trigger, and locks itself after an accident.

The crash sensors detect an impact, and their measured values arrive in the control unit. There, the decision about which restraint devices deploy is made within milliseconds. Between events, the unit monitors the entire system continuously and reports faults via the airbag warning light in the instrument cluster.

After an accident, the control unit records crash data and then remains locked. For the safety of the occupants it is therefore a central component, even though it works unnoticed in everyday use.

Why does the control unit 77960-T5A-J820-M1 fail?

The most common cause on the control unit 77960-T5A-J820-M1 is crash data from an accident, even if no airbag has deployed. Ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also possible.

Crash data cannot be removed with a standard diagnostic tool. Airbag24 removes it as part of the repair, so this point is taken care of during processing.

The other causes concern the electronics themselves. Components age, solder joints can go cold, and moisture together with corrosion attacks plug connections. Voltage spikes, for example from a weak battery or when a jump start is connected, can also affect the unit.

How can you tell that the 77960-T5A-J820-M1 is defective?

A defect in the 77960-T5A-J820-M1 shows up as the airbag warning light in the instrument cluster, which stays on permanently or intermittently, and as an error message there. The diagnostic tool then cannot establish a connection to the control unit, and the fault memory cannot be cleared. In this state, airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light is the most visible sign. It can burn continuously or come on and go out again intermittently; both call for a check.

A diagnostic tool that cannot connect to the control unit is another sign. Anyone who sees one of these messages needs the system checked.

Which vehicles is the 77960-T5A-J820-M1 fitted in?

The control unit 77960-T5A-J820-M1 is fitted in these vehicles: Honda Jazz GK (2013-2023).

The affected vehicles at a glance:

• Honda Jazz GK (2013-2023)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the right unit. Also have the fault memory read out beforehand, because only this log shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-SAA-F911-M1, 77960-SAA-G821-M1.

How does the repair of the 77960-T5A-J820-M1 work?

For the 77960-T5A-J820-M1, first have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Next, create the repair order online and send the unit in, well packed.

At Airbag24 the unit is first examined on the test bench. Defective components are repaired, stored crash data is erased, and a function test follows. Processing at Airbag24 usually takes 3–4 working days; afterwards your own unit comes 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-T5A-J820-M1 get to Airbag24?

You send the control unit 77960-T5A-J820-M1 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Enclose the printed repair order in the parcel and pack the control unit in a shock-proof way.