Many times this is caused by the alarm siren shorting out (leaking batteries) and causing battery drain in the car. Try pulling fuse #9 and see if your battery hold a charge. The only negative is you will need to lock and unlock manually while the fuse in removed. If the siren turns out to be the problem remove the front cowl, in front of the windshield, and unplug or replace the siren and re install the fuse. Type in siren in the search and get lots of info.