This is FAR from the first time it was posted on the internet how this is done, it's been well known, especially by thieves for nearly two decades. That's why they target them. Quite a few other vehicles of that era had the same vulnerability. Of course you shouldn't post it if it was some deep, dark secret, but it's not. My purpose in explaining it was so that victims or potential victims could understand how the thieves do it in order to be better able to protect against it.This is why I get ......... I want to talk about how this is a COMPLETE lack of street smarts to post something like this. Isn't this about the same time when all the hyundai and kia thefts started too. I also don't think this is how, I think I know how, and I'm not going to say how.
Personally, the best way to prevent theft is to wire in a kill switch.
Disconnect your battery, pull up the fuse panel, and pull out either the: injection or fuel pump connector pin off the panel. Wire a switch in line, and feed it into the cab. Route your wire hidden and install whatever switch that can't be seen. You could wiire it flush to the kick panel, under the seat to where you can only feel for it, under the center console, under the dash, heck wire it up the a-pillar and replace a map light. You could even swap make it the onstar button. Could even do a small push button above the pedals that you step on, kinda like the old high beam truck switches. It could also be completely under the carpet lets say next to the seat, where it's completely hidden even if looking right at it, and won't get accidentally kicked, and can be engaged with, where your passenger wouldn't even notice. (I THINK IT'S BEST NOT SAY EXACTLY WHERE TO PUT IT). Wire it back up and connect it in. If you can find a hidden spot, you could even just splice it in in-line.
If you really want to be slick about it, you could even (go pull if you need to, and) use old wiring so it blends in on both sides of the firewall.