Airbag control unit with part number 77960-SWA-S212-M4

What does the airbag control unit 77960-SWA-S212-M4 do?

The airbag control unit 77960-SWA-S212-M4 belongs to the restraint system (SRS) of Honda. It evaluates the signals from the crash sensors, decides in an accident within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously.

Faults that occur are stored in the fault memory and shown via the airbag warning light in the instrument cluster. This way you learn early about a malfunction.

After an accident the unit stores crash data and locks itself. The lock is only lifted by the repair.

Why does the control unit 77960-SWA-S212-M4 fail?

Stored crash data after an accident is the most common cause, even if no airbag has deployed. A standard diagnostic tool cannot remove it. In addition, aged electronics, cold solder joints, corrosion at plug connections and voltage spikes come into consideration.

Crash data remains stored in the unit until it is removed during a repair. That is why the fault can persist even though the vehicle drives normally afterwards.

The other causes are more of a technical nature: electronic components age, solder joints can go cold, moisture attacks plug connections, and voltage spikes from the on-board network stress the control unit. Which of these applies is shown by the inspection.

How can you tell that the 77960-SWA-S212-M4 is defective?

A defect shows itself at this airbag warning light, in fault messages in the instrument cluster, in a missing connection to the diagnostic tool and in a fault memory that cannot be cleared.

• Airbag warning light is on continuously or intermittently
• Fault message in the instrument cluster
• Diagnostic tool does not find the control unit
• Fault memory cannot be cleared

With these signs, airbags and seatbelt pretensioners may not be able to deploy in an emergency.

Take the warning light seriously and have the fault checked promptly.

Which vehicles is the 77960-SWA-S212-M4 fitted in?

The 77960-SWA-S212-M4 is fitted in these vehicles: Honda CR-V 3 RE (2006-2012).

The part number is recorded for the following vehicles:

• Honda CR-V 3 RE (2006-2012)

Compare the part number on the label of the removed unit with this page, so that you can be sure you have the right unit. Also have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether a plug or a 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-S212-M4 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and afterwards remove the control unit. Then create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Keep to this order, because the control unit may only be removed after the battery has been disconnected. The log goes with the unit.

Airbag24 checks the unit on the test bench, replaces defective components, clears the stored crash data and carries out a function test.

The unit you own, once repaired, is then returned 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-S212-M4 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order into the parcel, and pack the unit shock-proof.