Airbag control unit with part number 77960-SWA-H812-M4

What does the airbag control unit 77960-SWA-H812-M4 do?

The 77960-SWA-H812-M4 is the airbag control unit of the SRS restraint system of Honda. It evaluates the crash sensors and decides in a crash within milliseconds which airbags and seatbelt pretensioners are triggered.

Outside of an accident, it constantly checks the circuits of the system. If it detects a fault, the airbag warning light comes on.

In an accident it stores crash data and then locks itself.

Why does the control unit 77960-SWA-H812-M4 fail?

Stored crash data accounts for the largest share of causes for the 77960-SWA-H812-M4, even if no airbag has deployed. Further causes in brief:

• aged electronic components
• cold solder joints
• moisture and corrosion on plug connections
• voltage spikes, for example with a weak battery or a jump start

The crash data remains in place with a normal diagnostic tool. Airbag24 erases it during the repair.

How can you tell that the 77960-SWA-H812-M4 is defective?

A defect on the 77960-SWA-H812-M4 can be recognised by these signs, which can also occur together:

• airbag warning light in the instrument cluster lights up permanently or intermittently
• error message in the instrument cluster
• diagnostic tool gets no connection to the control unit
• fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may therefore not trigger. The warning light is thus a clear hint and not a minor matter.

Which vehicles is the 77960-SWA-H812-M4 fitted in?

The 77960-SWA-H812-M4 is fitted in these vehicles: Honda CR-V 3 RE (2006-2012).

The vehicles that our data associates with this control unit are listed below.

• Honda CR-V 3 RE (2006-2012)

Compare the part number on the label of the removed unit with this page. This confirms the unit is the right one, but says nothing about its condition. Have the fault memory read out, because 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-H812-M4 work?

First have the fault memory read out and enclose the log. Then disconnect the battery, and only after that remove the 77960-SWA-H812-M4. Afterwards create a repair order online and send the unit in. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components where necessary, erases the crash data and carries out a function test. After that, the 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-H812-M4 get to Airbag24?

You send the 77960-SWA-H812-M4 as a parcel or book a UPS collection for an extra charge. After the repair, UPS delivers the unit from Airbag24 back to you.

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