Airbag control unit with part number 77960-TR0-S811-M2

What does the airbag control unit 77960-TR0-S811-M2 do?

The control unit 77960-TR0-S811-M2 is the switching centre of the restraint system (SRS) at Honda. It evaluates signals from the crash sensors, determines within milliseconds in an accident the triggering of airbags and seatbelt pretensioners, and monitors the entire system continuously. Faults that occur are indicated via the airbag warning light.

The evaluation happens in fractions of a second.

After an accident it stores crash data and locks itself.

Why does the control unit 77960-TR0-S811-M2 fail?

Crash data stored in the unit 77960-TR0-S811-M2 after an accident is the most common cause of a failure, even if no airbag has deployed. A usual diagnostic tester cannot remove it. Other possible causes are ageing electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

A deployed airbag is not a prerequisite, because the data is created independently of it.

The other causes sit in the electronics themselves or at the contacts. Components age, solder joints can go cold, and moisture attacks plug connections. Voltage spikes arise, for example, with a weak battery or jump-starting.

How can you tell that the 77960-TR0-S811-M2 is defective?

If you suspect a defect on the 77960-TR0-S811-M2, look first at the airbag warning light: it lights up permanently or intermittently. The picture is completed by a fault message in the instrument cluster, by a diagnostic tool without connection, and by a fault memory that cannot be erased.

The warning light is a clear signal that the system is disturbed. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

Have the fault checked promptly.

Which vehicles is the 77960-TR0-S811-M2 fitted in?

The fitting of the control unit 77960-TR0-S811-M2 concerns these vehicles: Honda Civic 9th generation (2011-2017).

Here is the allocation at a glance:

• Honda Civic 9th generation (2011-2017)

Comparing the label on the removed unit with this page only confirms the right unit. Only reading out the fault memory beforehand shows whether the control unit is defective or whether the fault lies in a plug or a cable.

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-S811-M2 work?

For the repair of the 77960-TR0-S811-M2, you first have the fault memory read out and add the log. Then disconnect the battery and only afterwards remove the control unit. Next you create the repair order online and send the unit off well packed. Airbag24 checks the control unit, repairs defective components, erases crash data and tests the function; processing usually takes 3–4 working days.

The sequence must be observed for safety reasons.

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-S811-M2 get to Airbag24?

You send the control unit 77960-TR0-S811-M2 as a parcel or book a UPS collection for an extra charge. Airbag24 sends it back to you by UPS after the repair. Enclose the printed repair order in the parcel, and pack the unit shock-resistant.

A suitable box with padding prevents the control unit from taking shocks during transport.