My 2003 Explorer radio display reads CALL the radio,clock,tape and cd player wont work when this is displayed the message comes and goes.

 

See if the radio will do/enter the diagnostic self test.. It may give you a 'B' diagnostic trouble code, but would probably require service...

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 in radio tuner mode (AM/FM).
[ol][*]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.[/ol]
[*]To exit the audio unit self-diagnostic mode, turn the ignition switch or the audio unit off.[/ol]
[*]If the concern remains and the fault is not detected, proceed to the Symptom Chart to continue diagnostics.[/ol]
[*]The self-diagnostic mode has six manual tests available:
[*]Preset button 1 = ENTER DIAGNOSTICS. This test enters diagnostics from the speaker walk-around test. Metrics are available with SEL and ON buttons indicating time played in AM/FM, media, number of buttons pressed, etc.[/ul]
[*]Preset button 2 = EEPROM BLOCK STATUS. This test shows validity of memory to calibrate clock and seek sensitivity.[/ul]
[*]Preset button 3 = EXIT DIAGNOSTICS.[/ul]
[*]Preset button 4 = Software configuration level. This test queries each radio system controller for its software configuration level.[/ul]
[*]Preset button 5 = DISPLAY TEST. This test lights all the display segments for five seconds and then turns all segments off.[/ul]
[*]Preset button 6 = RAM CONTENTS READOUT. To enter these tests, press preset button 1 while in the speaker walk-around test, then the desired preset button.[/ul][/ol]
[*]To exit the self-diagnostic mode, turn the ignition switch off or the audio unit off.[/ol]

 

Not able to peform tests