Cabriolet airbag ecu replacment

[curleyder]

Hi everyone,
I have a Cabriolet 04 1.6 with an airbag problem.
I have had diagnostics done and saying drivers airbag.
I changed coilspring from a working car and didn't cure the problem
Changed pretensiners also ,soldered under seat wiring same story
light still on,brought it back to have codes removed and light, to same place diagnostics
were done.no joy.running out of options.
Can someone confirm if a airbag ecu from a 4 door megane 06 would be compatable to fit to
cabrio.does it have the same number of pretensioners .
thanks for any help on this