It will function just like it did before the factory lock went bad. All you're doing is sending someone alongside to help it do it's job. The piggyback actuator will lock the door, the alarm will sense they're all locked and will arm like it's supposed to. (assuming your alarm is OK).
Thank you code58,
one more thing I saw a set of 4 actuators in ebay for $21.00 including shipping, will those work or it has to be the one from the link at the start of the tread?
Thanks a lot for your help and to all the guys who do and contribute to the DIY, awesome, great, great, great help.
MIAGARE