Airbag control unit with part number 77960-TMM-F030-M4

What does the airbag control unit 77960-TMM-F030-M4 do?

As the central unit, the airbag control unit 77960-TMM-F030-M4 controls the restraint system (SRS) for Honda. It measures the signals from the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the entire system. It reports any faults via the airbag warning light.

After an accident the unit stores crash data and then locks itself. The fault memory is kept in the control unit, and it is read out using the diagnostic tool.

Why does the control unit 77960-TMM-F030-M4 fail?

The most common cause on the 77960-TMM-F030-M4 is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Further points follow, briefly summarised.

• Aged electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from jump-starting

Stored crash data only becomes visible when it is read out. This also works when no airbag has deployed.

How can you tell that the 77960-TMM-F030-M4 is defective?

A defect on the 77960-TMM-F030-M4 can be recognised by the airbag warning light in the instrument cluster, which lights up permanently or intermittently, and by a fault message in the instrument cluster.

In addition, the diagnostic tool does not establish a connection to the control unit, and the fault memory cannot be erased. In that case airbags and seatbelt pretensioners may not deploy in an emergency.

A warning light that goes out after a short time is no proof that everything is in order again, so a check is worthwhile.

Which vehicles is the 77960-TMM-F030-M4 fitted in?

The control unit 77960-TMM-F030-M4 is listed for the brand Honda. It is fitted in these vehicles: Honda CR-V 5 (2018-2023).

Next follows the list of vehicles recorded for this part number with us:

• Honda CR-V 5 (2018-2023)

Take the part number on the label of the unit and compare it with this page, so that it is clear the unit matches. Whether the control unit itself is defective is answered only by the fault memory read out, because a plug or a cable can also be the cause.

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-TMM-F030-M4 work?

First have the fault memory read out on the 77960-TMM-F030-M4 and attach the log to the unit. Then disconnect the battery and remove the control unit 77960-TMM-F030-M4; afterwards create a repair order online. Processing at Airbag24 usually takes 3–4 working days.

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

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-TMM-F030-M4 get to Airbag24?

You send the control unit 77960-TMM-F030-M4 to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, UPS brings the unit back to you.

Enclose the printed repair order in the parcel and pad the unit shock-proof.