Airbag control unit with part number 77960-TS0-B412-M1

What does the airbag control unit 77960-TS0-B412-M1 do?

The control unit 77960-TS0-B412-M1 is the central component of the restraint system (SRS) for Honda. It checks the signals from the sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system permanently. It reports detected faults via the airbag warning light.

In the background it checks continuously whether the sensor values are plausible, so that deviations are noticed immediately.

After an accident, the control unit stores crash data and locks itself.

Why does the control unit 77960-TS0-B412-M1 fail?

Stored crash data is the most common cause, even when no airbag was deployed. It cannot be removed with an ordinary diagnostic tool. Other possible causes include aged electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes, for example from a weak battery or a jump start.

Crash data is the control unit's record of the accident. It remains in the memory even if nothing is visibly wrong with the vehicle.

The other causes lie mainly in the electronics and their connections. Components age, solder joints can develop hairline cracks, and moisture attacks plugs. Voltage spikes additionally act on the circuits.

How can you tell that the 77960-TS0-B412-M1 is defective?

A defect shows up through the airbag warning light in the instrument cluster, through error messages and through connection problems with the diagnostic tool. Then airbags and seatbelt pretensioners may possibly fail to trigger in an emergency.

• The airbag warning light lights up permanently or intermittently.
• An error message appears in the instrument cluster.
• The diagnostic tool gets no connection to the control unit.
• The fault memory cannot be cleared.

Any single one of these signs is a reason to have the vehicle checked. No all-clear follows from this, because only the read-out shows the cause.

Which vehicles is the 77960-TS0-B412-M1 fitted in?

The control unit 77960-TS0-B412-M1 is fitted in these vehicles: Honda Civic 9th generation (2011-2017). What matters is that the part number is recorded for the respective vehicle.

The list below shows the vehicles on record.

• Honda Civic 9th generation (2011-2017)

Before removal, a comparison helps: matching the part number on the label of the unit with this page only confirms that you have the right unit. By contrast, have the fault memory read out, because only the result shows whether the control unit is defective or a plug or cable is causing the fault.

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-TS0-B412-M1 work?

First have the fault memory read out and enclose the log. Then disconnect the battery; only then remove the control unit. Only afterwards create a repair order online and send the unit in well packed.

You carry out the removal only after disconnecting the battery, and you pack the unit carefully before it is on its way.

At Airbag24, the team checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a functional test. Processing usually takes 3–4 working days. Afterwards, your own, repaired unit goes back 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-TS0-B412-M1 get to Airbag24?

Shipping is either by a parcel that you send yourself or by a UPS collection for an extra charge. The unit returns to you by UPS once Airbag24 has completed the repair.

Print the repair order and put it into the package; you pack the unit itself to withstand shocks.