Airbag control unit with part number 77960-TR0-Y620-M2

What does the airbag control unit 77960-TR0-Y620-M2 do?

The airbag control unit 77960-TR0-Y620-M2 coordinates the restraint system (SRS) in the Honda vehicle. It evaluates the signals from the crash sensors, decides within milliseconds in an accident about triggering the airbags and seatbelt pretensioners, and monitors the system. It indicates faults via the airbag warning light; after an accident it stores crash data and locks itself.

If there is no time to think in an accident, the decision runs in the unit without any action by the driver.

The control unit works together with sensors and triggers in the bodywork and the interior.

Why does the control unit 77960-TR0-Y620-M2 fail?

On the 77960-TR0-Y620-M2, the most common cause is crash data from an earlier 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 from weak batteries or jump-starting.

Crash data remains stored in the unit, because an ordinary diagnostic tool cannot erase it.

The other causes have to do with age and environment: components wear, solder joints can go cold, and moisture attacks contact surfaces.

How can you tell that the 77960-TR0-Y620-M2 is defective?

On the 77960-TR0-Y620-M2, you can recognise a defect mainly by the airbag warning light in the instrument cluster staying on permanently or intermittently. Further signs also confirm the finding. In that case, airbags and seatbelt pretensioners may fail to deploy in an emergency.

• Error message in the instrument cluster
• No connection between diagnostic tool and control unit
• Fault memory cannot be cleared

Since the vehicle reports the defect itself, it is worth clarifying it promptly.

Which vehicles is the 77960-TR0-Y620-M2 fitted in?

The 77960-TR0-Y620-M2 is fitted in these vehicles: Honda Civic 9th generation (2011-2017). Checking the label on the removed unit is worthwhile before you send it in.

Here is the overview of the models:

• Honda Civic 9th generation (2011-2017)

Checking the label only serves to identify the right unit. Whether the control unit itself is defective is revealed only by reading out the fault memory, which you should therefore have done before removal.

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-Y620-M2 work?

On the 77960-TR0-Y620-M2, have the fault memory read out and the log enclosed, then disconnect the battery and remove the control unit. Then create the repair order online and send in the unit, well packed. Checking, repairing and testing at Airbag24 usually takes 3–4 working days.

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

Keep to the sequence, because it protects you when working on the restraint system.

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-Y620-M2 get to Airbag24?

The 77960-TR0-Y620-M2 comes to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Put the printed repair order into the parcel and pack the unit shockproof.