I changed the battery and now the CD player won't work. It indicates "no disc". The CD player currently has 6 discs in it. However, I cannot play those not eject them.

Hi there:

From Hyundai Owners Manual: Er6 - DISC ERROR - CHECK IF THE DISC IS INSERTED CORRECTLY IN THE CD PLAYER.
MAKE SURE THE DISC IS NOT SCRATCHED OR DAMAGED.

Error 6 means your laser isn't reading disc... needs replaced pick up laser. I would try first to insert a clean up CD and test your CD Player with an original CD, if the problem persist, you have to go to fix it to a specialist.

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You listed this in the auto section, so I'm not sure just where you have the problem. When you receive an error like this and you've tried several disks with the same result it means your CD player is bad and must be replaced.

Before connecting any cables you must set the dip switch box to the position listed for your vehicle. If you set the dip-switches after you have connected cables to the box, you must disconnect and reconnect them for the changer to operate. All 1992-2004 Honda's are compatible with the Neo Changer except the 2003 and 2004 Honda Accord and all Honda Element vehicles. Some radio models require pressing "Seek >" once to start playing after changing CD or after startup. The radios display will not show the proper disc number after disc six. You can use all 10 discs in the magazine, but the readout will be wrong. This is not a technical problem; the car stereo was designed for no more than six discs. *Due to the direct access disc system, you will not be able to directly access discs 7-10. To access these discs you will have to go to the last track on disc 6 and let it play until it loads disc #7. ( you can fast forward the track, but you must let it play the last 5 seconds of the track, for it to change to disc # 7 Switch to the Neo Changer by pressing the "CD" button. To change discs press "Disc -" and "Disc +" To change tracks simply press "Seek <" or "Seek >" S E T T I N G S F O R H O N D A 1 2 3 4 5 6 7 8 ON OFF OFF ON OFF OFF ON OFF

Remove battery -ve cable for 10 to 15 min then refix it and on ing switch press eject knob on unit. i think it will work

The following is the owner's manual for your 2004 Dodge Neon:

http://www.dodge.com/en/owners/manuals/index.html?year=2004&nameplate=Neon

P.99 describes how to load discs:

1. Select and press any numbered button without an illuminated light above it.
2. Insert the CD while the light above the chosen button is flashing and the two lights on either side of the slot are illuminated.
3. Upon insertion, the CD will begin to play, and both the button light and the lights in the corner of the loading slot will illuminate.
4. Repeat the process for loading any additional CDs. The CD playe rwill stop while additional CDs are loaded.

Playing Discs
The radio will show the CD number, the CD track number, and the Track Time Elapsed while the radio is in the CD mode. IF more than one CD is loaded in the changer, the changer will automatically play the next disc after playing the last track of the current disc.

Wow, that's a lot of typing.
I didn't know the 2004 Dodge Neon had such a nice changer.
Good luck.

unplug the power to the cd player for about 10 minutes or so. usually that reqiures unhooking the car battery. if that radio is of the anti-theft variety make sure you know the code and how to enter it before you remove power

Have you tried running a cleaning device through it? The case may be that the laser that actually read the disc is either stuck in place or it has burnt out on it. That's if the cleaning doesn't work.

yes its the same plugs but you wont have the steering weal control

From Tiburon owners manual: Er6 - DISC ERROR - CHECK IF THE DISC IS INSERTED CORRECTLY IN THE CD PLAYER.
MAKE SURE THE DISC IS NOT SCRATCHED OR DAMAGED.

Cd mechanism issue, may be a broken gear.
It would not be able to read discs or load them, or throw them out.