Airbag control unit with part number 77960-TMC-Q030-M4

What does the airbag control unit 77960-TMC-Q030-M4 do?

In Honda, the airbag control unit 77960-TMC-Q030-M4 is the central control unit of the restraint system (SRS). It collects the signals from the crash sensors, determines in an accident which airbags and seatbelt pretensioners fire, and monitors the system continuously. It reports faults via the airbag warning light.

A functioning control unit is therefore essential for the entire system. Monitoring ensures that faults become visible.

After an accident, it stores crash data and locks itself.

Why does the control unit 77960-TMC-Q030-M4 fail?

Crash data stored after an accident is the most common cause, even if no airbag has deployed. A normal diagnostic tool cannot erase it. In addition, aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are possible.

The crash data are held in the memory of the unit. Aged components, cold solder joints and moisture at plug connections can also affect the unit, regardless of an accident.

Voltage spikes arise, for example, from a weak battery or jump-starting.

How can you tell that the 77960-TMC-Q030-M4 is defective?

A defect in the 77960-TMC-Q030-M4 shows up mainly as the airbag warning light in the instrument cluster and as error messages. A lost connection to the diagnostic tool, or a fault memory that cannot be cleared, also points to a problem.

The signs in detail:

• airbag warning light, permanently or intermittently
• error message in the instrument cluster
• no connection between the diagnostic tool and the control unit
• fault memory that cannot be cleared

In an emergency, airbags and seatbelt pretensioners may not deploy as a result, so every one of these signs deserves a check.

Which vehicles is the 77960-TMC-Q030-M4 fitted in?

The control unit 77960-TMC-Q030-M4 is fitted in vehicles from Honda: Honda CR-V 5 (2018-2023).

A list of them:

• Honda CR-V 5 (2018-2023)

You compare the part number on the label of the removed unit with this page, so you know you have the right unit. Have the fault memory read out beforehand, because only it shows whether the control unit itself is defective or a plug or cable is 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-TMC-Q030-M4 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Online, you create the repair order, and you send in the well-packed unit.

Airbag24 tests the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards, your own unit goes back to you.

Processing at Airbag24 usually takes 3–4 working days; this refers solely to the inspection, repair and testing. 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-Q030-M4 get to Airbag24?

You send the 77960-TMC-Q030-M4 in as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

You put the printed repair order into the parcel and pack the unit shockproof.