Radio displays "WAIT-2 Hr."
 

Hi everybody
I have a Chrysler Stratus 2,5 convertible 1997, frame number: 1C3ELB5H0VT555886 with original radio.
I have the code number for the Radio, but have keyed in the wrong number, so now the display in the radio says "WAIT"
I can't key in the wright number, and have tried to disconnect the battery, byt the display still says "WAIT"

What shall I do to be able to have the radio to display "CODE" in order to key in the wright code??
Thanks in advance for your help please
All the best Peter