modus not turning off?

Have a 2004 Renault modus,the batt was flat and I stupidly put the jump leads on the wrong way.now it has seemed to cause all sorts of problems 1. The car turns on as normal but will not turn off when I take the key out so have to stall it to stop the engine.I can hear a rely clicking like made in the engine bay? Any ideas? 2. Airbag lights are on.got it connected to machine and they couldnt turn them off,says it mite need a airbag ecu module?