Immobilizer failure Both keys used. The car unlocks but when you put a key in the ignition before you turn the key it states immobiliser failure, tried both keys both does the same, tried disconnecting the battery that doesnt work, tried the key in ignition press unlock that does nothing at all, the key will still turn but obviously doesnt start due to the immobiliser failure. Im out of any ideas. The key when locks flashes on the dash by the windscreen but notice when unlocked nothing is flashing on the dash.

SOURCE: Immobiliser light flashing and car

Hello, do you know what the locksmith did to get the code on your key? Did anything else flash on the screen when the car would not start. My car is doing the same thing, and my Jaguar dealer is 200 miles away. My screen is showing [Engine Fault, Transmission Fault and DSC Fault]. Any help would be greatly appreciated..

SOURCE: Smart for two X on dash, locks not responding.

Most probably you have a synchronization problem between key and the car.As signal is received since the signals are flashing , but security is not responding.
First , if you have a spare key , try it and see if that works. If not you need to reprogram the keys again. You can do that at any authorized Smart service center and it should not take much time to do it. Good luck

SOURCE: my renault laguna 1999 rt remote key fob wont work?

IF YOU TYPE 1999 RENAULT LAGUNA REPROGRAMME KEY INTO A GOOGLE SEARCH, YOU WILL BE ABLE TO PRINTOFF INSTRUCTIONS TO REPROGRAMME THE KEY TO THE KEY READER.THE IGNITION NEEDS TO BE OFF TO DO THIS

SOURCE: Key fob / immobilizer not unlocking door

sounds like the security part of the system went bad
take the key fob to the dealer and have it reflashed
if that fails replace the security computer or you can disconnect it from the car you won't have the system but the hazards won't come on unless you turn them on

SOURCE: 2007 hhr. Battery was drained. Mother left lights

your alarm system has been tripped when the battery went dead, to get the information on how to reset the alarm is to call the car manufacture to get the procedure, and should not cost you anything.