My car won't start or unlock (remote), what's the problem (read for more info)?

BP35

New Member
It's a 2005 Honda Accord.

I have a smartkey for it. When I press the unlock button, the car does not unlock. That small red light on the key/remote goes on but the car does not unlock. I can get in by manually unlocking it however, when I attempt to turn the car on nothing happens. No sound, no nothing. What could be the problem? It's not the remote battery either because I changed that.
Nothing works either. Lights, windows, doors, etc...

I don't understand how the battery can die out that quickly. A new one was put in just 2 months ago. And it never gave any warning either.
 
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