Airbag control unit with part number 77960-TR0-Y820-M2

What does the airbag control unit 77960-TR0-Y820-M2 do?

The airbag control unit 77960-TR0-Y820-M2 is the central control unit of the SRS for Honda. It checks the signals from the crash sensors, decides within milliseconds in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

Faults are displayed via the airbag warning light. After an accident it stores crash data and locks itself.

Why does the control unit 77960-TR0-Y820-M2 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it, but Airbag24 erases it during the repair. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

Ageing components lose reliability over time. Cold solder joints can in turn interrupt connections and so disrupt function.

Moisture and corrosion at plug connectors lead to transition resistance. Voltage spikes, for example from a weak battery or jump-starting, place additional strain on the electronics.

How can you tell that the 77960-TR0-Y820-M2 is defective?

A defect shows itself through an airbag warning light that stays on permanently or intermittently, through an error message, or through the diagnostic tool being unable to connect. A fault memory that cannot be cleared also indicates a defect. The airbags and seatbelt pretensioners may then fail to deploy in an emergency.

Typical signs:

• Airbag warning light in the instrument cluster stays on permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

The warning light reports the fault. Arrange an inspection without delay.

Which vehicles is the 77960-TR0-Y820-M2 fitted in?

Our allocation to Honda contains this control unit. The control unit 77960-TR0-Y820-M2 is fitted in these vehicles: Honda Civic 9th generation (2011-2017).

The vehicles from our allocation at a glance:

• Honda Civic 9th generation (2011-2017)

Compare the part number on the label of the removed unit with this page. That only confirms you have the right unit. Have the fault memory read out, because only the log shows whether the control unit is defective or a plug or cable is the cause.

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-Y820-M2 work?

Have the fault memory read out, attach the log, disconnect the battery and only then remove the control unit. Then create a repair order online and send the unit in well packed. Airbag24 needs 3–4 working days for inspection, repair and function test.

Make sure the battery is disconnected before removal. Only then pack the unit.

At Airbag24 the unit is checked on the test bench, defective components are repaired, stored crash data is erased and a function test is carried out. The unit then 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-Y820-M2 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends it back by UPS.

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