Airbag control unit with part number 77960-T5A-X820-M1

What does the airbag control unit 77960-T5A-X820-M1 do?

In Honda vehicles, the airbag control unit 77960-T5A-X820-M1 is the central switching unit of the restraint system (SRS). It registers an impact via the crash sensors, decides in a flash on airbags and seatbelt pretensioners, and indicates faults via the airbag warning light.

It runs in the background and constantly checks the sensors and actuators of the system. If a fault is detected, it stores it and reports it to the driver.

After an accident, the control unit stores crash data and locks itself.

Why does the control unit 77960-T5A-X820-M1 fail?

The most likely cause of the 77960-T5A-X820-M1 failing is crash data that remained stored after an accident, even if no airbag has deployed. Ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example with a weak battery or a jump start, are also possible.

Such crash data cannot be removed with a standard diagnostic tool. At Airbag24, it is deleted during the repair.

The other causes mainly concern the electronics and the plugs. Moisture and corrosion impair the contact, and aged components can fail.

How can you tell that the 77960-T5A-X820-M1 is defective?

Signs of a defect in the 77960-T5A-X820-M1 are the airbag warning light, error messages in the instrument cluster, and a diagnostic tool that cannot establish contact.

These signs are:

• The airbag warning light stays on permanently or intermittently.
• An error message appears in the instrument cluster.
• The diagnostic tool does not get a connection to the control unit.
• The fault memory cannot be cleared.

If one of these findings is present, airbags and seatbelt pretensioners may not trigger in an emergency. Such a warning should therefore be checked promptly.

Which vehicles is the 77960-T5A-X820-M1 fitted in?

The 77960-T5A-X820-M1 unit is fitted in these vehicles: Honda Jazz GK (2013-2023).

The vehicle list for comparison follows below.

• Honda Jazz GK (2013-2023)

Comparing the part number on the removed unit with this page only confirms that it is the right part. Whether the control unit is defective or a plug or cable is the cause is only shown by the fault memory, which you have read out beforehand.

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-X820-M1 work?

First have the fault memory read out, and enclose the log with the parcel. Then disconnect the battery; only after that remove the 77960-T5A-X820-M1. Afterwards create a repair order online and send in the unit, packed well.

At Airbag24, the unit is examined on the test bench and defective components are repaired. Stored crash data is deleted by Airbag24, followed by a function test. Processing usually takes 3–4 working days.

Finally, the return follows. 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-X820-M1 get to Airbag24?

You can ship the 77960-T5A-X820-M1 control unit as a parcel, or alternatively book a UPS collection for an extra charge. After the repair, UPS brings it back to you.

Put the printed repair order into the parcel, and cushion the control unit shock-proof.