Quote Originally Posted by 1BADC10 View Post
Any chance that key has a chip in it that has lost it's link with the 'Kon?

A lost association will yield what you're talking about. I only say this b/c you said you switched keys, and it started right up. Has it always happened ONLY when using her keys, or both?

Just another angle to look into.
I'm not sure. That isnt something I have paid attention to before now. It may have been a coincidence that it cranked with the other key but I dont think so. I have done some searching and heres what I have found so far:
The main possibilities are: 1. Bad lock cylinder. 2. Bad ignition switch. 3. Bad IPC. 4. Bad ECM. 5. Wiring problem to either of these components.
Im still not sure about the security system. How does this thing work? What triggers it?