Airbag control unit with part number 77960-SWA-F240-M4

What does the airbag control unit 77960-SWA-F240-M4 do?

The airbag control unit 77960-SWA-F240-M4 forms the control centre of the restraint system (SRS) for Honda. It processes the measurements from the crash sensors and determines in a crash, within milliseconds, which airbags and seatbelt pretensioners are triggered.

While driving, it checks all connected components without interruption. If it finds a fault, the airbag warning light in the instrument cluster lights up.

After a crash, the control unit creates crash data and locks itself.

Why does the control unit 77960-SWA-F240-M4 fail?

For the control unit 77960-SWA-F240-M4, the most common cause after an accident is stored crash data, even if no airbag has deployed. Other causes include ageing components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Stored crash data cannot be removed with an ordinary diagnostic tool. Airbag24 erases it during the repair.

The other causes affect the electronics and their power supply: components age, solder joints become brittle, moisture attacks contacts, and voltage spikes occur, for example with a weak battery or a jump start.

How can you tell that the 77960-SWA-F240-M4 is defective?

On the 77960-SWA-F240-M4, you can recognise a defect by the airbag warning light, error messages, a missing connection to the diagnostic tool or a fault memory that cannot be emptied.

These signs point to a fault:

• Airbag warning light in the instrument cluster on permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool does not establish a connection to the control unit
• Fault memory cannot be cleared

Airbags and seatbelt pretensioners may then fail to trigger in an emergency. A prompt check is therefore advisable.

Which vehicles is the 77960-SWA-F240-M4 fitted in?

The 77960-SWA-F240-M4 is fitted in these vehicles: Honda CR-V 3 RE (2006-2012).

The following vehicles are recorded for this part number:

• Honda CR-V 3 RE (2006-2012)

Compare the part number on the label of the removed unit with this page. This only confirms that you have the right unit.

Have the fault memory read out beforehand. Only this result shows whether the control unit 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-F240-M4 work?

First, have the fault memory read out and enclose the printout. Then disconnect the battery and only then remove the 77960-SWA-F240-M4. Create the repair order online and pack the unit well. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24, the unit is measured on the test bench, defective components are replaced, the crash data is erased and a function test is run. The unit then goes back to you.

The time frame of 3–4 working days applies only to testing, repairing and checking 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-SWA-F240-M4 get to Airbag24?

You send the control unit 77960-SWA-F240-M4 as a parcel or book a UPS collection for an extra charge. UPS handles the return shipment after the repair.

Include the printed repair order in the parcel. The unit must be packed shockproof.