Airbag control unit with part number 77960-TR0-P422-M1

What does the airbag control unit 77960-TR0-P422-M1 do?

The airbag control unit 77960-TR0-P422-M1 is the central control of the restraint system (SRS) in Honda. It processes the messages from the crash sensors, triggers the suitable airbags and seatbelt pretensioners within a few milliseconds in a crash, and monitors the system continuously. It indicates detected faults via the airbag warning light.

Triggering in a crash is only one of its tasks. In everyday use it checks wiring, sensors and firing circuits and stores detected faults in the fault memory.

If an accident occurs, the unit stores crash data and locks itself.

Why does the control unit 77960-TR0-P422-M1 fail?

Crash data stored after an accident is the most common cause, even if no airbag has deployed. It cannot be erased with a standard diagnostic tool. Aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes also play a role.

At Airbag24, the crash data is erased during the repair.

Voltage spikes arise, for example, from a weak battery or a jump start. Aged components and cold solder joints are hard to recognise from the outside.

How can you tell that the 77960-TR0-P422-M1 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition, the instrument cluster shows a fault message, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

If the warning light is on, airbags and seatbelt pretensioners may fail to deploy in an emergency. That is why a prompt check is important.

A defect can also be present when the warning light only lights up intermittently. Keeping an eye on the warning light is therefore worthwhile.

Which vehicles is the 77960-TR0-P422-M1 fitted in?

The 77960-TR0-P422-M1 is fitted in these vehicles: Honda Civic 9th generation (2011-2017).

Here is the list of vehicles:

• Honda Civic 9th generation (2011-2017)

Compare the part number on the label of the removed unit with this page, so that you know for certain that it is the correct control unit. Whether the control unit itself is defective or a plug or a cable is the cause is shown only by reading out the fault memory, which you should therefore arrange 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-P422-M1 work?

First have the fault memory read out and attach the log, then disconnect the battery and only afterwards remove 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.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Afterwards your own unit goes 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-TR0-P422-M1 get to Airbag24?

You send the control unit 77960-TR0-P422-M1 as a parcel or book a UPS collection for an extra charge. Airbag24 returns it by UPS after the repair.

Pack the control unit shockproof and attach the printed repair order.