The only battery back-up is within the siren, (unless they have had a full battery back-up kit fitted, which is very rare). Either way, having a battery back-up will never cause the remotes to not operate.
If you have a Clifford Concept 600 on your car, theoretically, you shouldn't be able to drive the car without deactivating the immobiliser either via a remote or by using the valet code.
The sirens have a 1 year warranty regardless of how long the battery has been disconnected. How do the batteries cope before installation!
The batteries usually last for about 3 years.
The siren itself will still work. Only the battery back-up part is buggered. Change the siren and it will all work again.
That's not the turbo timer function. The turbo timer function can only last up to 8 minutes max. Usually set to about 2 minutes.
If your car is a manual, doing the procedure you describe IS for the Intallistarts 'manual start enable'
If you press the side button, then the bottom button, then remove the keys, the engine should still run. Exit the car and close the doors, then arm the alarm. The car should shut down. To restart by Intellistart push the star on the Icon remote or the right button on the old style master. You should get two indicator flashes and the car should start.
Thats crap. Some dealers really piss me off with their money grabbing tactics. All they need to do is access the main unit and the programming plug will be accessible.
They can re-program most things simply by using your valet code.