Airbag control unit with part number 77960-SZT-J811-M2

What does the airbag control unit 77960-SZT-J811-M2 do?

The 77960-SZT-J811-M2 is the airbag control unit of the restraint system in Honda vehicles. It processes the readings from the crash sensors, determines in an accident whether airbags and seatbelt pretensioners are triggered, and checks the system continuously.

It shows faults via the airbag warning light in the instrument cluster. After an accident it stores crash data and locks itself.

The control unit works permanently in the background.

Why does the control unit 77960-SZT-J811-M2 fail?

In the 77960-SZT-J811-M2, stored crash data is the main cause, even if no airbag was triggered in the accident; a normal diagnostic tool cannot remove it. Additional causes are aged components, cold solder joints, moisture with corrosion at plug connections, and voltage spikes from the vehicle electrical system.

Airbag24 erases the crash data during the repair, once the unit has been tested.

The other causes are mostly everyday wear of the electronics and environmental influences at the connectors. A weak battery or a jump-start can produce voltage spikes that damage the unit.

How can you tell that the 77960-SZT-J811-M2 is defective?

A defect in the 77960-SZT-J811-M2 shows up as the airbag warning light in the instrument cluster, in the fault memory and in a missing connection to the diagnostic tool.

These signs are typical:

• airbag warning light on permanently or intermittently
• error message in the instrument cluster
• diagnostic tool has no access to the control unit
• fault memory cannot be cleared

Such defects can mean that airbags and seatbelt pretensioners may not trigger in an emergency.

Which vehicles is the 77960-SZT-J811-M2 fitted in?

The control unit 77960-SZT-J811-M2 is fitted in these vehicles: Honda CR-Z ZF1 (2010-2016).

The vehicles to which this part number belongs are shown in the overview:

• Honda CR-Z ZF1 (2010-2016)

Comparing the part number on the label with this page only ensures that you have the right unit in front of you. Whether the control unit itself is defective is revealed only by the fault memory, which you should have read out before removal.

For the same vehicles, we also repair control units with the part numbers 77960-SZT-A011, 77960-SZT-A011-M2.

How does the repair of the 77960-SZT-J811-M2 work?

For the 77960-SZT-J811-M2, have the fault memory read out, enclose the log and disconnect the battery before removing the control unit. Then create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days, during which the unit is checked, repaired and tested.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data and carries out a function test.

The sequence at the start is mandatory for safety reasons. Afterwards your own device is returned 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-SZT-J811-M2 get to Airbag24?

The unit goes to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

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