Martin wrote: "An off-the-shelf remote central locking unit will interface directly with the stock lock module (as long as you trust it - I modified mine with new relays). I have remote locking and remote starting (meant for a 5-speed)and alarm system all on the one fob and it has cost me less than $100" I agree with Martin, the stock lock module is completely trustworthy with minor upgrades and almost any aftermarket keyless entry system will interface with it. I have remote starting, keyless entry, full alarm, and one or both door launchers on a four button FOB for about $150 total cost (I did the install) The engineering wasn't that difficult and all the functions are integrated into a single off the shelf box made by a well known alarm company.