did it affect your factory alarm system in anyway? The reason I ask is on my 1988 560sel if you lock the driver's door with the key and try to unlock the passenger door with the key - the alarm goes off. I then have to lock the passenger door and run around and unlock the driver's door with the key to disable the alarm. I was just curious if releasing the locks from the trunk will trigger the alarm or if you lock the doors with the keyless remote will the alarm even be activated? I have heard that there is a mechanical mechanism in the driver's door that is used by the key to arm the alarm. Is your alarm disabled when you lock doors with keyless unit? Thanks. If everything is good, I will definately install one in my car.