If it's for the stock alarm then the wires before the harness connector will be violet with red stripe and the other white with a black stripe. If not then it's not a stock component. I can tell you that the location where it's route through is not a location for any stock wiring. I suspect that it's either a hood sensor for an aftermarket alarm/remote start system or a DIY fix for the stock alarm.
If your stock alarm doesn't arm when the car is locked (the stock system didn't have a wireless remote, it is armed and disarmed by locking/unlocking the car door with the key) then you may want to try taping the switch in a closed position and try to arm the stock alarm. The "Security" light on the dash will light up once armed.
__________________
If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum.
If you're so inclined I'm always more than happy to accept tips via PayPal. 
Tip Jar ---> 
|