Our 6CD Radio indicates all the CD Slots are full and there are no CD's in it. It will not "load", just says "CD Error". I purchased another USED radio same exact Model # and it does the same thing. Do I have (2) bad radio's which do the exact same thing? Or is there something else in the vehicle which would make the radio's indicate this? Like rear controls?

 

Here's something to play with.




Speaker Walk-Around Test

NOTE: To enter the speaker walk-around test or audio unit self-diagnostic mode, the audio unit must be turned on and in tuner mode (AM/FM).

To enter the speaker walk-around test, simultaneously press the audio unit preset buttons 3 and 6.
The speaker walk-around test stops at each speaker and applies sound to each speaker for about one to two seconds. Each speaker is tested and displayed on the audio unit in the following sequence: RF, LF, LR, RR.
The speaker walk-around test automatically continues and tests for a speaker short and CD/DJ. If a speaker short exists, SPKR SHORT will be displayed. If the vehicle is not equipped with CD/DJ or if the CD/DJ is not responding, NO DJ will be displayed.

Audio Unit Self-Diagnostic Mode

NOTE: To enter the speaker walk-around test or audio unit self-diagnostic mode, the audio unit must be turned on and be in tuner mode (AM/FM).

To enter the following tests, depress the desired preset button while in the speaker walk-around test or while in the audio unit self-diagnostic mode.
To exit the audio unit self-diagnostic mode, turn the ignition switch or the audio unit off.
If the concern remains and the fault is not detected, proceed to the Symptom Chart to continue diagnostics.
The audio unit self-diagnostic mode has six tests available:
Preset button 1 = Audio internal/external SELF TEST. This test is an on-demand self-test. If SELF FAIL is displayed, press TUNE > to scroll view the DTCs stored. Refer to the audio unit Diagnostic Trouble Code (DTC) Index. If the system is OK, SELF PASS will be displayed.
Preset button 2 = View/Clear continuous DTCs. NO DTCS is displayed if no DTCs are retrieved. If DTCS FOUND is displayed, press TUNE > to view the DTCs retrieved. Refer to the audio unit Diagnostic Trouble Code (DTC) Index. To clear all DTCs, press the EJECT button. DTCS CLEAR will be displayed.
Preset button 3 = SIGNAL TEST. This test measures the average strength at the current tuner setting.
Preset button 4 = Software configuration level. This test queries each audio unit system controller for its software configuration level. SOFT LEVELS will be displayed upon completion of the query. Press TUNE > to scroll view the software configuration version level.
Preset button 5 = DISPLAY TEST. This test will light all the audio unit display segments for five seconds. When the test is complete, DISPLAY TEST is displayed on the bezel.
Preset button 6 = RAM CONTENTS READOUT. To enter these tests, depress preset button 1 while in the speaker walk-around test, then the desired preset button.
NOTE: Always document, clear and carry out the audio unit on-demand self-test again.

 

I performed the Tests as you indicated. What do the DTCS mean?
Test #1 - U2008 PHONE, U2003 CDDJ, TEST FAIL
Test #2 - B2406CD Plus the same codes as test #1.

 

CD/DJ - Compact Disk / Disk Jockey and is the mechanism for the cd changer - which is driven from logic of the player.

Here's the rest of the section. I doubt if it will help, if it's not a bad circuit it says send the unit in for repair. It might be time for a new one.