You will need the five digit security code to input via the numbers on the stereo panel. When you turn on the radio you will be prompted to enter the numbers. If you don't have them contact a dealer and they can retrieve them for you.
Some stereo systems coming with Camry have auto-theft protection code, it means if you disconnect battery or the stereo itself, you will have enter a code when you power it on. If you do not that code you might have some hard times unblocking the stereo. Also some people have problems with fuses after battery change. Thus the fuse boxes.
The stereo system is secured with a password so that if it is stolen, it can't be used. When you change your battery, power to the stereo is disconnected so it behaves as though it has been removed. once you enter the password, the stero will function again.
You may have to disconnect and recharge your car battery for your car stereo to work again.
connect the positive and negative to the stereo
I never knew there was a 2001 element!!!
No.
yes, it is possible
A basic electrical circuit needs a voltage supply (battery or household outlet), wiring to carry electrons to and from the voltage supply to the load, and a load (motor, light, heat element, stereo, blender, whatever).
The batteries may not be in correctly.
power from the battery
Yes it can.
It depends on the capacity of the battery and the power used by the stereo. To roughly calculate the time, divide the amount of charge in the battery (amps hours) by the amount of current (amps) used by the stereo. If you don't know the current, divide the power of the stereo (watts) by 12. That would give you the current at max power output (max volume).