hi,
i am having one vehicle tracking system which i want to install in my
car which is having center lock system (operation with remote).

now the tracking unit i have is having three wires comming out ("COM",
"NC" , "NO").
if "com" connected to (+12dc) the "NC" give the +12v output while "no"
act as grd. when the unit is given command "no" gives +12v and "nc"
grd.

i want this to connect to door lock which have 2 wires to the motor one
+12v one (grd), when remote triggerd the polarity changes and the lock
opens and close.

how can i connect these two,?
will it be any short circuit if the commands entered from both (remote
and tracking unit).?