Airbag control unit with part number 77960-TR0-K621-M1

What does the airbag control unit 77960-TR0-K621-M1 do?

The airbag control unit 77960-TR0-K621-M1 coordinates the restraint system (SRS) for Honda. It continuously checks the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners to trigger.

In addition, it monitors the entire system without interruption and reports faults via the airbag warning light. After an accident it stores crash data and locks itself. The lock is lifted only by the repair.

Why does the control unit 77960-TR0-K621-M1 fail?

The most common cause on the 77960-TR0-K621-M1 is crash data stored after an accident, even if no airbag has deployed. Other causes include ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be erased with a standard diagnostic tool. Airbag24 erases them during the repair.

The remaining causes mainly concern the electronics and their connections. Ageing, solder joints and corrosion change the signal behaviour, and voltage spikes place additional strain on the components.

How can you tell that the 77960-TR0-K621-M1 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently on the 77960-TR0-K621-M1, and a fault message appears in the instrument cluster. The diagnostic tool cannot establish a connection, and the fault memory cannot be cleared.

A defect is therefore indicated by the warning light. If these signs occur, airbags and seatbelt pretensioners may possibly not deploy in an emergency.

Whether the control unit itself is affected or the wiring is the problem is clarified by reading out the fault memory.

Which vehicles is the 77960-TR0-K621-M1 fitted in?

The control unit 77960-TR0-K621-M1 is fitted in these vehicles: Honda Civic 9th generation (2011-2017). Whether your car is included is shown by comparing the part number on the label of the removed unit with this page.

The assignment of this part number to the following vehicles is known to us:

• Honda Civic 9th generation (2011-2017)

The label comparison only confirms the unit, not the cause. Whether the control unit is defective or a plug or cable is the cause only becomes clear from the fault memory. Therefore have it read out beforehand.

For the same vehicles, we also repair control units with the part numbers 77960-TS4-U411-M1, 77960-TS4-U811-M2, 77960-TS4-Z611-M1, 77960-TS6-H711-M1, 77960-TT0-T011-M1, 77960-TT0-Y610-M2.

How does the repair of the 77960-TR0-K621-M1 work?

You first have the fault memory read out and attach the log, then disconnect the battery. Only then do you remove the control unit 77960-TR0-K621-M1, and afterwards you create a repair order online and send in the unit.

This sequence serves safety and is binding. Please keep to it exactly.

Airbag24 checks the submitted unit on the test bench and repairs defective components. Airbag24 then carries out a function test, after which your unit goes back. Checking, repairing and testing usually take 3–4 working days.

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-TR0-K621-M1 get to Airbag24?

You send the control unit 77960-TR0-K621-M1 as a parcel or book a UPS collection for an extra charge. Airbag24 returns the unit to you by UPS after the repair.

Put the printed repair order into the parcel. Pack the unit shock-proof before it sets off.