I think its a combination of both, the car and Ikey are communicating or attempting to communicate with each other 24/7 or so I've heard. Even while you're sleeping the car is still sending signals to the fob. When you hit the button on the door handle, the car pretty much does what Ormand illustrated in his post.
When you hit a button on the fob I think its more like Fob: "hey car its me, open up". If the fob is asking from to far of a distance than the car rejects the signal and won't open.
I think this is the reason they die so fast compared to a normal key fob's battery.
I always thought that red flashing light was the immobilizer however.
2004 2.5S 10/24/2006 -10/20/2007
2007 3.5SE 6-speed 10/20/2007~
Mods: Fujita WAI | DDM Tuning Slim 35W 6000K H11's | Nismo Catback exhaust | Racingline Y-pipe
Current track data: 60' 2.332 1/4 mile 14.276@100mph
252fwhp & 230lb-ft torque
- more accurate
Last edited by Dexion; 11-26-2008 at 02:49 AM.