Please can someone help. I have a c180 copue on a 2002 plate and my smart key has all of a sudden stopped working. I have had my windows tinted about 6 months ago and everything was working as it should with no issues. I use the car daily and the keys have never let me down. I have tried both keys and none of them work. I used the car the other night and locked it with my smart key when I went to it in the morning it was not working. I have tried to open the windows with the smart key using the IR feature but this is not working either. the car starts and drives perfectly I have checked all the fuses and there is no blown fuses. pls can someone help as I really dont want to have to pay the dealer prices