[dunsantos]

I had this same problem over the weekend. So I take out my soldering iron and go to town. After I was done I went outside and tried it out. No deal, still won't open my doors. Oh well...

So later that day I get in the car and try to start it up. The engine starts then immediately shuts off. I try it again and the alarm starts going off. I couldn't turn the damn alarm off so I went and grabbed my spare key and it turns right off.

So apparently, there's some unpowered circuitry that is necessary to even start the car or shut the alarm off and I burned it right the f**k off the board. Nice huh?

Just wanted to share this with you. I later soldered my spare key _carefully_ and had no problems. It's tiny so you gotta take your time. This is a great thread though and I was happy to find it when my key went bad, thanks DESIREE.