An autopage alarm can be connected to your auto interior lights so you can turn your lights on remotely. This can be useful when approaching your vehicle at night and need help finding it or for safety reasons you would like the interior of the vehicle lit up. These lights are hooked up in different ways depending on the alarm system and the vehicle. In the majority of cases the white wire from the alarm wiring harness will be attached to the light control output wire. Check your installation manual for the proper wiring configuration. It is a good idea to have an alarm professionally installed unless you have experience working on cars.
For more info, see How to Install an Autopage Car Alarm