Airbag control unit with part number 77960-TMC-Q110-M4

What does the airbag control unit 77960-TMC-Q110-M4 do?

The 77960-TMC-Q110-M4 works as the airbag control unit in the restraint system (SRS) of Honda. It continuously checks the crash sensors and, in a crash, decides within a fraction of a second which airbags and seatbelt pretensioners are triggered.

The airbag warning light in the instrument cluster makes faults visible as soon as the unit detects them. The control unit is therefore the component that monitors the function of the entire system.

After an accident it stores crash data and locks itself. A repair lifts the lock.

Why does the control unit 77960-TMC-Q110-M4 fail?

Crash data from an earlier accident is the most common cause, even if no airbag was deployed in it. Other causes are aged components, cold solder joints, corrosion at plugs, moisture and voltage spikes in the vehicle electrical system.

The crash data remains in the memory until it is specifically erased. A normal diagnostic tool does not reach it. Airbag24 erases it during the repair.

Apart from that, electronic components age over time, solder joints can stay cold, and plug connections suffer from moisture and corrosion. A weak battery or connecting a jump start can produce voltage spikes that damage the control unit.

How can you tell that the 77960-TMC-Q110-M4 is defective?

A defect shows itself when the airbag warning light in the instrument cluster lights up permanently or intermittently, when an error message appears, when the diagnostic tool cannot establish a connection, or when the fault memory cannot be cleared. In that case airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light is the first indication. Take it seriously and have the system checked promptly. A defect does not stay hidden, because the light shows it for as long as the unit detects it.

Error messages in the instrument cluster are also among the signs you should heed, regardless of how well the vehicle runs in everyday use.

Which vehicles is the 77960-TMC-Q110-M4 fitted in?

The 77960-TMC-Q110-M4 is fitted in these vehicles: Honda CR-V 5 (2018-2023).

Here follows the list of the vehicles for which this part number is recorded.

• Honda CR-V 5 (2018-2023)

Compare the part number on the label of the removed unit with this page. That way you can see that it is the correct unit. Whether the control unit is defective or a plug or cable causes the fault is shown only by the fault memory, which you have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 77960-TLA-A240-M4, 77960-TLA-A250-M4, 77960-TLA-A310-M4, 77960-TLA-A320-M4, 77960-TLA-A410-M4, 77960-TLA-A420-M4.

How does the repair of the 77960-TMC-Q110-M4 work?

First read out the fault memory and attach the record, then remove the control unit after disconnecting the battery. Airbag24 checks the unit, repairs it and carries out a function test; this takes 3–4 working days as a rule.

Afterwards create a repair order online and send in the unit well packed. Airbag24 repairs defective components and erases stored crash data before the unit makes its way 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-TMC-Q110-M4 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you via UPS.

Place the printed repair order in the parcel. Pack the unit so that it is shock-resistant.