when I lock or open my c220 1996 ,the red and green lights on my rear view mirror and on my door handle flashes for about a minute at the same time .
It use to flash red for close and green for open .
Can someone please tell me what to do or what is wrong ???

I had the same problem and fixed it by replacing the batteries in the remote (the flashing lights are an indicator according to the owners manual on my 1996 E320. Hope that's all it is.

AS most 1996 cars have DAS (drivers auth system) anit-theft system, the lights flash to show a problem. As previous post said it could be as simple as weak batteries in infra-red sending unit.

What does it mean when the red and green light flash alternately? Here's my prob...the other night while my mother in law is driving the car home from the hospital with my 2 kids (our third had just been born) the car starts to slow and then stops. Now the car won't start. It's definitely not the battery b/c the car turns fine, it just doesn't fire and start. I read in the manual about the start lock and thought the sensor, b/c it's flashing red then green, red then green, etc, might not be sending the signal to the starter to go ahead and start the thing. I also read a ton about the OVP...maybe that's it? The thing just won't start. 120k miles. Thanks for the help.