"Check Airbag" message

Last week a "Check Airbag" warning message started showing on the dash of my Clio RS 197. At first it came and went, but has been permanently there for a couple of days now.

Any suggestions for a quick fix before I take it in to Renault dealer?
 
Connection under the seat. Mine comes on if I move the seat backward and forward again (ie if somebody getting into the back seats). Try sliding the seat each way or squeezing the connector below the seat together. Always sorts it on mine.

It's a common issue if you have the recaro seats fitted.