The system does not lock the doors and not allow the key to operate the lock. The only possibility I can think of is that while the battery was draining away, the actuators got stuck and froze and this would not allow you to use the keys to unlock the doors.
The possibility of this occurring to all the doors is rather slim and when you use the unlock button, you mentioned a diffrent noise, that could indicate the actuators were stuck and the noise indicates they had been worked loose.
Anyway glad to know you have fixed the problem and this is something new we have learnt.
Friday, January 13th, 2012 AT 1:43 PM