Airbag control unit with part number 77960-TS4-C411-M1

What does the airbag control unit 77960-TS4-C411-M1 do?

In the Honda the airbag control unit 77960-TS4-C411-M1 works as the central control unit of the restraint system (SRS). It analyses the signals from the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

The control unit is active outside accidents too. It checks wiring, power supply and firing circuits, and any faults found are stored in the memory.

You will not notice the lock after an accident while driving. It only shows when a diagnostic tool cannot address the control unit.

Why does the control unit 77960-TS4-C411-M1 fail?

Most often the cause is crash data from an accident, which remains stored even without an airbag deployment; a normal diagnostic tool cannot erase it. Other causes are aged electronics, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

A control unit records that an accident took place. This record remains, regardless of whether the seatbelt pretensioner or an airbag fired.

Aged electronics push components to their limits. Cold solder joints can lose contact once the unit warms up and cools down again.

Moisture and corrosion attack the plug connections and disturb the transmission. Voltage spikes, which occur for example with a weak battery or when starting with outside help, can additionally damage the electronics.

How can you tell that the 77960-TS4-C411-M1 is defective?

A defect is indicated by the airbag warning light in the instrument cluster staying on permanently or intermittently, a fault message in the instrument cluster, a lack of connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared.

Typical signs at a glance:

• Airbag warning light stays on permanently or intermittently
• Message in the instrument cluster
• Diagnostic tool cannot find the control unit
• Fault memory remains after an erase attempt

With these signs, airbags and seatbelt pretensioners may not deploy in an emergency. Please have the system checked promptly.

Which vehicles is the 77960-TS4-C411-M1 fitted in?

The control unit 77960-TS4-C411-M1 is fitted in these vehicles: Honda Civic 9th generation (2011-2017). Compare this information with your vehicle.

The vehicles are listed here:

• Honda Civic 9th generation (2011-2017)

First check the number on the label of the removed unit against this page. This confirms that you have the right unit. Also have the fault memory read out before removal. Only this log shows whether the control unit is defective or whether a connector or a 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-TS4-C411-M1 work?

First read out the fault memory and attach the log. Then disconnect the battery and remove the control unit. Afterwards create the repair order online. At Airbag24 processing usually takes 3–4 working days.

Your steps begin at the vehicle: read out the fault memory, attach the log, disconnect the battery and only then remove the control unit. Create the repair order online afterwards and pack the unit well.

At Airbag24 we test the unit on the test bench, replace defective components and erase stored crash data. A function test follows before your own unit is returned.

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-TS4-C411-M1 get to Airbag24?

You send the control unit to us as a parcel or book a UPS collection for an extra charge. After the repair the return is made by UPS.

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