Airbag control unit with part number 77960-TV0-E920-M4

What does the airbag control unit 77960-TV0-E920-M4 do?

The airbag control unit 77960-TV0-E920-M4 forms the central control unit of the SRS system for Honda. It evaluates the crash sensors, decides on the deployment of airbags and seatbelt pretensioners within milliseconds in the event of an accident, and monitors the system continuously. It indicates faults via the airbag warning light; after an accident it stores crash data and locks itself.

Monitoring takes place constantly, that is, even when nothing is happening. The control unit compares the measured values continuously with its specifications.

Because a device of this kind is safety-relevant, every fault must be taken seriously.

Why does the control unit 77960-TV0-E920-M4 fail?

The most common cause on the 77960-TV0-E920-M4 is crash data stored after an accident, even if no airbag was deployed; a normal diagnostic tool cannot erase them. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data arise from the accident itself, not from the condition of the control unit. They remain in the device and stand in the way of a normal diagnosis.

Without an accident, a fault can develop through aging. Electronics change over time, and moisture finds its way to the contacts. Voltage spikes arise, for example, when the battery is weak or external power is connected.

How can you tell that the 77960-TV0-E920-M4 is defective?

A fault on the 77960-TV0-E920-M4 shows up as an airbag warning light in the instrument cluster that stays on permanently or intermittently, as an error message in the instrument cluster, as a diagnostic tool that cannot establish a connection, or as a fault memory that cannot be cleared. In that case the airbags and seatbelt pretensioners may not be able to deploy in an emergency.

The warning light is the most obvious sign. It shows permanently or repeatedly that something is wrong with the restraint system, and that is exactly where you should look.

A missing connection to the diagnostic tool does not necessarily lie with the control unit. Wires or plugs can also be the cause, which is why only the read-out brings clarity.

Which vehicles is the 77960-TV0-E920-M4 fitted in?

The control unit 77960-TV0-E920-M4 is fitted in these vehicles: Honda Civic 9th generation (2011-2017).

The list is compiled here for you:

• Honda Civic 9th generation (2011-2017)

Compare the part number on the label of the removed unit with this page to make sure the unit is the right one. The comparison only confirms the unit, not the fault. Have the fault memory read out beforehand, because the log shows whether the control unit is defective or whether a plug or cable is affected.

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-TV0-E920-M4 work?

For the repair of the 77960-TV0-E920-M4, you first take the steps before sending: have the fault memory read out, attach the log, disconnect the battery and only then remove the control unit. Then create a repair order online and send the unit well packed. Airbag24 needs 3–4 working days for checking, repairing and testing as a rule.

At Airbag24 the unit is checked on the test bench, defective components are repaired, stored crash data are erased and a function test is carried out.

You then receive your own unit back.

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-TV0-E920-M4 get to Airbag24?

You send the control unit 77960-TV0-E920-M4 as a parcel or arrange a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

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