06 Chrysler sebring,bought car with no remotes for doors,had an add on remote entry installed. no problem for three yrs. Now when the temp. is under 35 or so degrees when you unlock doors the horn sounds,its a steady sound,not short bursts. the add on didnt sound the horn when locking-unlocking,only lights blinked..only happens when its cold.any ideas???

 

Have you asked the people who sold you the add-on system? I am positive they will have much more information about the system and what they did to install it than anyone here.