The speakers on my 2009 elantra radio cut out intermittently. I banged on the dash and now they are out completely fuses are good

Push in the connectors at the back of the radio. They could have come loose Most units have two.

Check all cables to battery especially the ground negative cable.

I would start by having someone who has a little electric knowledge to look for a loose wire. I would start with the ground wire. maybe it just never got tightened down right at the factory or over the years electricity can build up some erosion.

check your fuse for radio or auxilary

check fuse pannel under hood it might be in there rather than in under the dash

First check to see if the radio is coming on. Does the light work and can you change stations. If it appears that the radio is working visually, either your speaker plug in at the back of the radio for the speakers is loose, or you have an internal problem in the output section of the radio. However, first I would check my fuse panel & make sure that the fuse that powers the radio is good. Rick

Check out this link , has goos description on removal of Dash & Audio.

http://www.carspace.com/guides/2001-06-Hyundai-Elantra-Audio-Guide

More than likely with a 2003, the speakers that cut out are in the door or doors. Do they cut out of both speakers?

If they cut out of one, then you may have an intermittent speaker ( the wire to the cone becomes partially connected)

If both speakers turn off at the same time and you hear NOTHING on all speakers, then you more than likely have an intermittent connection on the radio itself and probably replacement is probably cheaper than fixing the radio.

One more thing
Factory radios sometimes have an amplifier in them. Sounds funny but they call the Radio in the dash the Head Unit and the amplifier is buried in the dash. You could have a bad amplifier or a loose power connection to it, but that is very unlikely.

Hope this helps.

E
E

did u know that they make a harness for your car that plugs into your factory harness and then adapts to your aftermarket radio? for the lights, you have blown the interior light fuse, it may be the same fuse as the cigar lighter.Below is your radio wire colors and what they do.
1990 Toyota Corolla Car Stereo Radio Wiring Diagram.
Radio Constant 12V+ Wire: Blue/Yellow
Radio Switched 12V+ Wire: Gray
Radio Ground Wire: Brown
Radio Illumination Wire: Green
Radio Dimmer Wire: N/A
Radio Antenna Trigger Wire: N/A
Radio Amp Trigger Wire: N/A
Front Speakers Size: 4′
Front Speakers Location: Dash
Left Front Speaker Wire (+): Pink
Left Front Speaker Wire (-): Purple
Right Front Speaker Wire (+): Purple
Right Front Speaker Wire (-): Light Green
Rear Speakers Size: 4′
Rear Speakers Location: Rear Deck
Left Rear Speaker Wire (+): Black
Left Rear Speaker Wire (-): Yellow
Right Rear Speaker Wire (+): Red
Right Rear Speaker Wire (-): White
-->

Battery LIGHT GREEN (+) RADIO HARNESS
Accesory BROWN (+) RADIO HARNESS
Ground BLACK (-) RADIO HARNESS
Illumination DARK GREEN/WHITE (+) RADIO HARNESS
Dimmer DARK GREEN/BLACK (+) RADIO HARNESS
LF Speaker (+) GREEN/RED
LF Speaker (-) LIGHT GREEN/WHITE
RF Speaker (+) RED/BLUE
RF Speaker (-) LIGHT GREEN/BLACK
LR Speaker (+) YELLOW/WHITE
LR Speaker (-) YELLOW/BLUE
RR Speaker (+) GREEN
RR Speaker (-) GREEN/BLUE
Radio Security YES