What you need to do is press the internal central locking switch on the roof panel (in front of the rear view mirror) for about 10 seconds until you hear 2 very distinct clunks in the doors. Then...
Type your answer here..it could be the switch that oprerates the fans,located on left hand side of radiator,about half way down the rad
What you can do is use a credit card. That's what I use.
http://www.bba-reman.com/content.aspx?content=Test_for_Renault_Key_Immobiliser_failures_emergency_recode
Check the fuses, same thing happened to me. i had a blown fuse.