MEMS3 and airbag (Temic or AB Autoliv) both use the same pin on the diagnostic socket.
Therefore if your pscan can talk to the MEMS3 then there is no problem with the pscan.
Most likely there is no power to the airbag ECU or it has completely died.
Pscan is not able to reconfigure airbag ECUs, therefore if you get replacement it's best to get one from a car with a similar configuration.
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