Airbag control unit with part number 77960-TLA-C410-M4

What does the airbag control unit 77960-TLA-C410-M4 do?

The airbag control unit 77960-TLA-C410-M4 forms the switching centre of the restraint system (SRS) of Honda. It processes the messages from the crash sensors, selects within milliseconds in a collision which airbags and seatbelt pretensioners should fire, and keeps the entire system under observation.

If the unit detects a fault, it alerts the driver via the airbag warning light in the instrument cluster. This light is therefore the most important warning sign of the system.

After an accident the control unit stores crash data and locks itself. Only the repair lifts this lock.

Why does the control unit 77960-TLA-C410-M4 fail?

The most common cause is crash data stored after an accident, even if no airbag has fired. A normal diagnostic tool cannot erase it, so the fault remains.

At Airbag24 this crash data is erased during the repair. You therefore do not need to take care of this step yourself.

Other causes can be everyday ageing and moisture problems. Electronic components age over time, solder joints can go cold, and moisture together with corrosion impairs plug connections. Voltage spikes, for example from a weak battery or when a jump start is connected, can also damage the unit.

How can you tell that the 77960-TLA-C410-M4 is defective?

A defect is mainly revealed by the airbag warning light in the instrument cluster that is permanently or intermittently on, by a fault message in the instrument cluster, by a diagnostic tool without connection to the control unit, and by a fault memory that cannot be cleared.

• airbag warning light that stays on permanently or intermittently
• fault message in the instrument cluster
• diagnostic tool cannot connect to the control unit
• fault memory cannot be cleared

Signs like these are a reason to have the restraint system examined promptly. Airbags and seatbelt pretensioners may possibly not deploy in an emergency, even if the vehicle seems normal in everyday driving.

The fault memory helps narrow down the cause, because it shows which message the system has stored.

Which vehicles is the 77960-TLA-C410-M4 fitted in?

Control unit 77960-TLA-C410-M4 is fitted in these vehicles: Honda CR-V 5 (2018-2023).

The list shows the vehicles that Airbag24 has assigned to this part number. Nevertheless, check your own vehicle against the assignment before acting.

• Honda CR-V 5 (2018-2023)

The part number on the label of the removed unit should match the one listed here. Have the fault memory read out beforehand, so that you know for certain that the control unit is defective and not a connector or a cable.

For the same vehicles, we also repair control units with the part numbers 5WK43782, 77960-SWA-G212-M4, 77960-SWA-G214-M4, 77960-SWAA-213-M1.

How does the repair of the 77960-TLA-C410-M4 work?

First read out the fault memory, disconnect the battery and remove the control unit. Then create a repair order online and send in the well-packed unit.

The log of the fault memory and the unit should be packed so that transport delivers the parcel undamaged.

At Airbag24 the unit is checked on the test bench, defective components are replaced, stored crash data is erased and a function test is carried out. Processing usually takes 3–4 working days. This period refers solely to checking, repairing and testing at Airbag24.

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-TLA-C410-M4 get to Airbag24?

You send the unit as a parcel to Airbag24 or book a UPS collection for an extra charge. After the repair, control unit 77960-TLA-C410-M4 comes back to you by UPS.

Put the printed repair order in the parcel and pack the control unit shock-proof.