2003 Ford F-150, Door Pin Switches?

ok,i put a remote start on a f150 with pats system,all works well...........almost.it has a factory keyless,not sure if it has a factory alarm,it just has a flahing security light.everything works great,keyless and remote start and all.

problem is,when it sits for about 30 minutes,it just goes off ,i disarm it and it beeps 3 times telling me that a pinswitch was triggered.i know that fords are positive usually but the information i had told me they were negative.ive had this problem before when the wrong polarity was used.so is this the problem you think?

on a 2003 f 150,what wire do i need to hook to the pinswitchs,purple for positive or green for negative.im using diodes to isolate the pinswitchs from one another also.