Airbag control unit with part number 77960-SWA-S211-M4

What does the airbag control unit 77960-SWA-S211-M4 do?

The airbag control unit 77960-SWA-S211-M4 controls the SRS restraint system in Honda vehicles. In an impact, it decides within milliseconds on the triggering of airbags and seatbelt pretensioners and monitors the system continuously. After an accident it stores crash data and locks itself.

The unit shows any faults found via the airbag warning light. The light is in the instrument cluster and is the first indication that something in the system is not right.

The unit works as an independent evaluation point, and its faults can affect the entire system.

Why does the control unit 77960-SWA-S211-M4 fail?

Stored crash data is the most common cause in the 77960-SWA-S211-M4: it arises after an accident, even if no airbag was triggered, and it cannot be removed with a standard diagnostic tool.

Airbag24 erases this crash data during the repair. The data is therefore no sign of a plug or cable fault, but points to the unit itself.

Other causes are also possible, such as ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

How can you tell that the 77960-SWA-S211-M4 is defective?

A defect on the 77960-SWA-S211-M4 shows up on the airbag warning light in the instrument cluster, which stays on permanently or intermittently. In addition, a fault message appears, the diagnostic tool cannot find the control unit, and the fault memory cannot be cleared.

Take such signs seriously. In an emergency, airbags and seatbelt pretensioners may fail to trigger, even if the car drives completely normally in everyday use.

You should have the system checked even if the light appears only intermittently.

Which vehicles is the 77960-SWA-S211-M4 fitted in?

The part number 77960-SWA-S211-M4 is intended for Honda vehicles. It is fitted in these vehicles: Honda CR-V 3 RE (2006-2012).

The assignment can be seen in this overview:

• Honda CR-V 3 RE (2006-2012)

Before removal, have the fault memory read out. This shows whether the control unit itself is at fault or a plug or cable is the cause. Then compare the part number on the label of the unit with 77960-SWA-S211-M4.

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-S211-M4 work?

First have the fault memory read out and attach the log to the order. Then disconnect the battery, remove the control unit 77960-SWA-S211-M4 and create a repair order online. Only then pack the unit and send it in.

At Airbag24, the unit is checked on the test bench, defective components are repaired, the crash data is erased and a function test is carried out. Your own unit is then returned to you.

Airbag24 usually plans 3–4 working days for this work. 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-S211-M4 get to Airbag24?

You send the unit as a parcel, or arrange a UPS collection for an extra charge. After the repair, Airbag24 sends your own unit back to you by UPS.

Put the printed repair order into the parcel, and pack the unit shockproof.