Hello and welcome to Just Answer!
Could you try this? Start vehicle, let run for 2 minutes and then disconnect the VTSS module and leave running for 2 minutes. Turn vehicle off and leave VTSS module unplugged. Then restart vehicle and PCM will not recognize theft.
This should disable the security system.
The security module is located near the glove box and here is how to remove it.
-Remove ash tray.
-Remove 6 center bezel screws and center bezel.
-Remove 2 screws holding dash pad located behind top of center bezel. Pry defroster
bezel from dash pad and disconnect sensor wires (if equipped) and set defroster bezel aside.
-Remove 4 in defroster duct opening holding dash pad. Remove 3 screws above instrument panel cluster holding dash pad.
-Open glove box and remove 2 screws holding dash pad. Remove dash pad prying gently on
each end to unsnap end clips. Remove 8 screws from top and bottom of glove box bezel.
-Remove right side bezel lower retaining screw next to ash tray opening. Remove side window demister boot from glove box bezel and right side bezel from instrument panel.
-Disconnect glove box light and switch connector. Remove VTA module and disconnect connector
I hope this helps, let me know!