Airbag control unit with part number 77960-TS8-A120-M4

What does the airbag control unit 77960-TS8-A120-M4 do?

The control unit 77960-TS8-A120-M4 is the SRS control unit for Honda and evaluates the signals from the crash sensors. In an accident, it decides within milliseconds which airbags and seatbelt pretensioners are triggered. It also monitors the system continuously.

The unit passes on detected faults via the airbag warning light in the instrument cluster. The monitoring runs in the background, so you notice nothing of it in everyday use.

After an accident, the unit stores crash data and locks itself. The repair lifts the lock.

Why does the control unit 77960-TS8-A120-M4 fail?

The most common cause of a fault in the 77960-TS8-A120-M4 is crash data from an earlier accident, even if no airbag was triggered. A normal diagnostic tool cannot remove it. Other causes are aged components, cold solder joints, moisture on plugs and voltage spikes.

• aged components
• cold solder joints
• moisture and corrosion on plugs
• voltage spikes, for example from a weak battery or a jump start

If no airbag has triggered, this does not mean that no crash data was created. This is therefore important when looking for the fault.

The other causes all act on the electronics or their connections.

At Airbag24, crash data is erased during the repair.

How can you tell that the 77960-TS8-A120-M4 is defective?

The airbag warning light in the instrument cluster lights up on the 77960-TS8-A120-M4 permanently or intermittently. A fault message appears in the instrument cluster, the diagnostic tool gets no connection to the control unit. In addition, there is a fault memory that cannot be cleared; airbags and seatbelt pretensioners may then possibly not trigger in an emergency.

Take this warning seriously even if the vehicle continues to drive. A prompt inspection is then advisable.

Whether the control unit itself is defective or a cable is behind it can only be determined by reading out the fault memory.

Which vehicles is the 77960-TS8-A120-M4 fitted in?

The 77960-TS8-A120-M4 is fitted in these vehicles: Honda Civic 9th generation (2011-2017).

The following list shows the vehicles recorded for this part number:

• Honda Civic 9th generation (2011-2017)

Check the part number on the label of the unit and compare it with this page. This only confirms the unit. The cause is not confirmed. Have the fault memory read out beforehand, because it shows whether the control unit 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-TS8-A120-M4 work?

Airbag24 needs 3–4 working days for the inspection and repair as a rule. First, have the fault memory read out and enclose the log. Then disconnect the battery and remove the control unit 77960-TS8-A120-M4. Finally, send it in packed with a repair order created online.

At Airbag24, the unit goes onto the test bench. Defective components are repaired, stored crash data is removed and a function test is carried out. After that, your own unit returns 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-TS8-A120-M4 get to Airbag24?

You send the control unit 77960-TS8-A120-M4 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back by UPS.

The printed repair order goes into the parcel. Pack the control unit shock-proof, so that it arrives undamaged.