Keith's answer below works perefectly...Thank you Keith;
This was almost right for my laguna mk1 estate,
I have had this problem after management system was reset after repair (Alt/powersteering pump delt snapped)
Step 1 Ign off, leave drivers door open!!
Step 2 Press Central door locking button for more than 5 secs, doors will lock/unlock and then dash light will stay on!! (not flashing)
Step 3 Press and hold each key fob button until flashing light on key fob goes out (Important!!) Doors will lock and unlock,
Step 4 Get out car, shut door, try key fobs, they should work!!
Keith.
Russ, October 2010