Replaced battery in my 97 - SL500 and cannot get the radio to reprogram. When radio is turned on the word "CODE" appears. I enter the 5 digit code and push the "SC" button and the word "WAIT" shows. Ignition is not left on for more than 30 minutes at a time and "WAIT" still shows. After four or five times doing this "CODE" appears again with the "C" flashing. I enter the code, push "SC' and the process starts all over again. What am I doing wrong?

Don't know if the radio instructions on my "99 SL500 are the same as on your '97 SL500. On my '99 after you enter the five digit code on the alpha -numeric keypad you confirm same by pressing the "OK" key. If an incorrect code is entered three times,"WAIT" will appear on the display and the radio will be locked out for about 10 minutes.Note: The lock out time will only count down if the radio is left switched on.