Airbag control unit with part number 77960-SWA-E231-M4

What does the airbag control unit 77960-SWA-E231-M4 do?

The 77960-SWA-E231-M4 is the central control unit of the SRS for Honda. It evaluates the crash sensors, decides within milliseconds in the event of an impact which airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The control unit detects faults itself and reports them via the airbag warning light. After an accident it stores crash data and locks itself.

Why does the control unit 77960-SWA-E231-M4 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Further causes in the 77960-SWA-E231-M4 are aged components, cold solder joints, moisture and voltage spikes.

Crash data cannot be deleted with an ordinary diagnostic tool. At Airbag24 it is erased during the repair, so that a complete check is possible afterwards.

In addition, these causes may apply:

• ageing electronics
• solder joints with cold contact
• wetness and corrosion in plugs
• voltage spikes with a weak battery or during a jump start

How can you tell that the 77960-SWA-E231-M4 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently. This is accompanied by a fault message in the instrument cluster, a lost contact with the diagnostic tool, or a fault memory that cannot be cleared.

Such signs mean that airbags and seatbelt pretensioners may not deploy in an emergency. The light is therefore not a mere symbol but an indication that something is wrong with the restraint system.

Which vehicles is the 77960-SWA-E231-M4 fitted in?

The 77960-SWA-E231-M4 is fitted in these vehicles: Honda CR-V 3 RE (2006-2012).

The overview of the vehicles for this part number is shown here:

• Honda CR-V 3 RE (2006-2012)

Comparing the part number on the label of the removed unit with this page only confirms that it is the correct unit. Separately, reading out the fault memory is important, because only this result shows whether the control unit itself is defective or whether a plug or cable is the cause.

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-E231-M4 work?

First have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit. Next, create a repair order online and send the unit well packed. At Airbag24, checking, repairing and testing usually take 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components and deletes the stored crash data. A function test follows, and your own unit is then sent back to you.

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-E231-M4 get to Airbag24?

The 77960-SWA-E231-M4 reaches Airbag24 either as a parcel or via a UPS collection booked for an extra charge. After the repair you receive the unit back by UPS.

Pack the control unit shock-proof and enclose the printed repair order.