In the Underhood Fuseblock located in the Engine Compartment, just beside the Battery...
Based on the information in the question, the only answer we can suggest is that it broke.
check either end of the dash when you open the doors the fuse panel doors are the pull type
The fuse should be in the fusebox for it, look in your owners manual for it's position in the fusebox.
Radio has it's own fuse in the back of the radio
The radio fuse is used for the CD player on a 2003 Honda Accord. To reset the radio pulled the specified fuse out of the fuse box.
Under the hood beside the battier
The radio on a 2003 Chevy Impala can be typically be fixed by replacing the fuse. If the radio does not work when powered, it will need to be replaced with a new unit.
The radio is fused Not the speakers. If you have a problem then the radio is the culprit.
There is no fuse, it is directly connected and when it burns out it destroys the wire harness. Found this out the hard way on my 07 Impala.
under the hood of car on passenger side and it is a 20 amp yellow fuse
No
It's in the Passenger's Side Instrument Panel Fuse Block. Open the Passenger's door. On the side of the Panel, remove the Fuse Cover and locate the Fuse marked {RADIO}.....
Based on the information in the question, the only answer we can suggest is that it broke.
check either end of the dash when you open the doors the fuse panel doors are the pull type
In the fuse box next to the battery. There are two 30a fuses on both sides of the fan relays.
The side with the name of the CD goes face up.
It will tell you in your owners manual if you have it.