Airbag control unit with part number 77960-SWA-Q812-M4

What does the airbag control unit 77960-SWA-Q812-M4 do?

The airbag control unit 77960-SWA-Q812-M4 is responsible for triggering within the restraint system (SRS) of Honda. In an accident, it evaluates the signals from the crash sensors and decides within milliseconds which airbags and seatbelt pretensioners are activated.

In addition, it checks the system continuously during operation. Faults found are stored in the memory and shown via the airbag warning light.

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

Why does the control unit 77960-SWA-Q812-M4 fail?

The most common cause on the 77960-SWA-Q812-M4 is crash data from an earlier accident, even if no airbag was triggered. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

Crash data cannot be erased with a normal diagnostic tool. It remains in the memory until Airbag24 removes it during the repair.

The following further causes are also possible:

• Aged electronic components
• Cold solder joints
• Moisture and corrosion at plug connectors
• Voltage spikes, for example from a weak battery or a jump start

How can you tell that the 77960-SWA-Q812-M4 is defective?

On the 77960-SWA-Q812-M4, the airbag warning light in the instrument cluster stays on permanently or intermittently, and an error message also appears in the instrument cluster. Furthermore, the diagnostic tool then gets no connection to the control unit, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The warning light is the direct feedback from the control unit to you at the steering wheel.

Whether the cause lies in the control unit itself only becomes clear when the fault memory is read out. Until then it is not checked whether the restraint system works fully.

Which vehicles is the 77960-SWA-Q812-M4 fitted in?

The 77960-SWA-Q812-M4 is fitted in these vehicles: Honda CR-V 3 RE (2006-2012).

At Airbag24, the following vehicles are assigned to this part number:

• 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 right unit. Have the fault memory read out beforehand: only that 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-Q812-M4 work?

First read out the fault memory and enclose the log. Then disconnect the battery, remove the 77960-SWA-Q812-M4 and create the repair order online. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases the crash data and carries out a function test. Afterwards your own unit goes 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-Q812-M4 get to Airbag24?

The control unit 77960-SWA-Q812-M4 is sent in as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns your unit by UPS.

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