Airbag control unit with part number 77960-T5A-X420-M1

What does the airbag control unit 77960-T5A-X420-M1 do?

The control unit 77960-T5A-X420-M1 coordinates the restraint system (SRS) for Honda. It processes the messages from the crash sensors, selects within fractions of a second in an accident which airbags and seatbelt pretensioners are to trigger, and checks the system constantly. If it detects a fault, the airbag warning light in the instrument cluster lights up.

The check works throughout the entire journey, and individual signals are checked continuously during it.

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

Why does the control unit 77960-T5A-X420-M1 fail?

The most common cause is crash data from an earlier accident, even if no airbag was triggered in it; an ordinary diagnostic tool cannot reach it. Further causes are aged electronic components, cold solder joints, moisture and corrosion on plugs, and voltage spikes, for example from a weak battery or a jump start.

The crash data remains stored even if nothing conspicuous was visible on the vehicle.

The other causes relate to the electronics and their connections. Solder joints can go cold, plug connections corrode over time, and voltage spikes additionally stress the unit.

How can you tell that the 77960-T5A-X420-M1 is defective?

A defect shows itself through the airbag warning light, through error messages in the instrument cluster, through a missing connection between the diagnostic tool and the control unit, and through a fault memory that cannot be cleared. In this case, airbags and seatbelt pretensioners may possibly fail to trigger in an emergency.

• The airbag warning light is lit permanently.
• It lights up only intermittently.
• An error message appears in the instrument cluster.
• The diagnostic tool cannot establish a connection to the control unit.
• The fault memory cannot be cleared.

The signs only describe what becomes visible on the vehicle. The cause cannot be read from them; that requires reading out the fault memory.

Any single one of these signs is already reason enough for a check.

Which vehicles is the 77960-T5A-X420-M1 fitted in?

The control unit 77960-T5A-X420-M1 is fitted in these vehicles: Honda Jazz GK (2013-2023). What counts is that the part number is recorded for the respective vehicle.

The following list shows the vehicles on record.

• Honda Jazz GK (2013-2023)

Compare the part number on the label of the removed unit with this page; this only ensures that it is the right unit. Also have the fault memory read out beforehand, because 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 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-X420-M1 work?

First have the fault memory read out and enclose the log with the unit. Then disconnect the battery, and only then remove the control unit. Then create a repair order online and send the unit in well packed.

Start removal only after the battery has been disconnected. Then pack the unit so that it is shock-resistant before it is sent.

At Airbag24, the unit is checked on the test bench, and Airbag24 replaces defective components. Airbag24 erases stored crash data and then carries out a functional test. Processing at Airbag24 usually takes 3–4 working days, after which your own unit returns 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-X420-M1 get to Airbag24?

The unit reaches Airbag24 either as a parcel or through a UPS collection for an extra charge. The return is by UPS, once the repair at Airbag24 is complete.

Do not forget the printed repair order, and pack the unit shock-resistant.