I have 2 Lexus'. In my LS400 , I can be 125 feet away and the built in remote will work both of my doors. On the other hand, sometimes I have to be within 15 feet for the remote on my GS300 to work the doors. ANy ideas as to how to lengthen the "reach" by my GS300? I feel sort of goofy having to drive up and stop waiting for my garage door to open up