Are you sure it's 5 beeps??
5 honks/beeps means the remote start is sensing the key is in the ignition. My guess would be the SecuriLock/PATS unit is at fault.

For future reference.
2 honks = Hood is open or brake is depressed
3 honks = One of the doors is open
4 honks = Tach is not programmed
5 honks = Key is in ignition
6 honks = System is in Service/Valet mode



Matt