Airbag control unit with part number 77960-SWA-L210-M4

What does the airbag control unit 77960-SWA-L210-M4 do?

The airbag control unit 77960-SWA-L210-M4 controls the restraint system in Honda vehicles. It processes the readings from the crash sensors, decides within milliseconds in an accident on airbags and seatbelt pretensioners, and monitors the condition of the system continuously.

The unit reports faults in the system via the airbag warning light. These include faults in sensors, firing circuits and wiring, which are recorded in the fault memory.

After an accident, the unit stores crash data and locks itself.

Why does the control unit 77960-SWA-L210-M4 fail?

Stored crash data can lead to failure, because it remains in the unit after an accident even if no airbag was triggered. A normal diagnostic tool cannot erase this data.

The owner may notice nothing, because the vehicle drives inconspicuously in everyday use and the incident may lie far in the past. Only when the unit is connected to the diagnostic tool does it become apparent that the memory is occupied.

In addition, there are general causes: components age, solder joints go cold over time, moisture and corrosion attack plug connections, and voltage spikes, for example from a weak battery or a jump start, stress the electronics.

How can you tell that the 77960-SWA-L210-M4 is defective?

You can recognise a defect on the 77960-SWA-L210-M4 mainly by the airbag warning light in the instrument cluster. It lights up permanently or intermittently, accompanied by a fault message, and the diagnostic tool no longer finds the control unit.

In addition, the fault memory cannot be cleared, even when you try to do so with the tool. This is a clear sign that something is wrong in the control unit.

In an emergency, airbags and seatbelt pretensioners may then fail to trigger, so the warning must be taken seriously.

Which vehicles is the 77960-SWA-L210-M4 fitted in?

The part number 77960-SWA-L210-M4 belongs to vehicles in which the control unit is fitted: Honda CR-V 3 RE (2006-2012).

The overview lists the vehicles recorded so far for this part number.

• Honda CR-V 3 RE (2006-2012)

Reading out the fault memory before removal clarifies whether the control unit is really defective or whether plugs or cables are the cause. Afterwards, it is worth comparing the part number on the label of the removed unit with this page.

For the same vehicles, we also repair control units with the part numbers 77960-SWA-G214-M4, 77960-SWA-S21, 77960-SWA-S214-M4, 77960-T0AA-110-M1, 77960-TA0-A031, 77960-TLA-A25.

How does the repair of the 77960-SWA-L210-M4 work?

First read out the fault memory and attach the log. Then disconnect the battery, remove the control unit, create a repair order online and send it in, well packed. For testing, repairing and inspecting at Airbag24, normally 3–4 working days are planned.

Airbag24 inspects the unit on the test bench, repairs the defects in the affected components, erases stored crash data and carries out a function test. The own unit is then returned.

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-SWA-L210-M4 get to Airbag24?

You send the control unit 77960-SWA-L210-M4 to Airbag24 as a parcel or book a UPS collection. After the repair, Airbag24 sends it back to you by UPS.

Pack the printed repair order in with the unit and pack the control unit shock-resistant.