Airbag control unit with part number 77960-TR3-X811-M1

What does the airbag control unit 77960-TR3-X811-M1 do?

The airbag control unit 77960-TR3-X811-M1 coordinates the restraint system (SRS) in vehicles of Honda. It processes the messages from the crash sensors, decides in an accident within milliseconds on the triggering of airbags and seatbelt pretensioners, and reports faults via the airbag warning light.

While driving, the monitoring runs continuously in the background. The unit has no function that you would notice in everyday use.

After an accident the unit stores crash data and locks itself. The further sections of this page describe how this state affects diagnosis and repair.

Why does the control unit 77960-TR3-X811-M1 fail?

The most common cause for the 77960-TR3-X811-M1 is crash data stored after an accident, even if no airbag was triggered. A standard diagnostic tool cannot erase them. Besides the crash data, ageing components, cold solder joints and moisture also come into question.

Stored crash data therefore remain in the control unit, even when little appears to be wrong with the airbag system from outside. The diagnostic tool then finds no way to remove them.

Ageing electronic components, cold solder joints, and moisture and corrosion at plug connections can likewise lead to failure. Voltage spikes, for example from a weak battery or jump-starting, additionally stress the electronics.

How can you tell that the 77960-TR3-X811-M1 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently in the event of a defect in the 77960-TR3-X811-M1. In addition, a fault message in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be cleared can occur. In this case airbags and seatbelt pretensioners may not be able to deploy in an emergency.

The light is the warning signal to watch first. It shows the state of the restraint system, even if the vehicle continues to drive normally.

If you notice any of these signs, have the fault memory read out as soon as possible. Only the log shows which entries the control unit has stored.

Which vehicles is the 77960-TR3-X811-M1 fitted in?

The control unit 77960-TR3-X811-M1 is fitted in these vehicles: Honda Civic 9th generation (2011-2017). Our assignment of this part number is decisive.

The following list shows the vehicles known to us for this part number.

• Honda Civic 9th generation (2011-2017)

Compare the part number on the label of the removed unit with this page. That only confirms that it is the correct unit. Also have the fault memory read out beforehand, because only the log shows whether the control unit is defective or whether 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-TR3-X811-M1 work?

You first have the fault memory read out and attach the log. Then you disconnect the battery and remove the control unit 77960-TR3-X811-M1. Only afterwards do you create a repair order online and send in the well-packed unit.

At Airbag24 the control unit is first examined on the test bench. Defective components are replaced, stored crash data are erased, and finally a function test is carried out before your own unit is returned. Checking, repairing and testing at Airbag24 usually takes 3–4 working days.

These steps must be carried out in exactly this order 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-TR3-X811-M1 get to Airbag24?

You send the control unit 77960-TR3-X811-M1 as a parcel, or book a UPS collection for an extra charge. Airbag24 sends the unit back to you by UPS after the repair.

Include the printed repair order in the parcel, and pack the unit shockproof.