Please check the information that came along with the owner's manual. It should be printed on a card that comes with those booklets. I assume you've already done that though. I've attached the procedure for entering the code below. Let me know if you have any trouble with it.
If the radio is disconnected from the power supply it is not ready for operation when reconnected. After switching on the ignition and the radio the word "CODE" appears on the display and the letter "C" flashes.
NOTE: The five-digit code number for this radio is printed on the CODE CARD which you were given.
Enter the code number with station buttons, e.g. number 1, station button 1.
After entering the first digit the word "CODE" disappears and the digit entered is displayed followed by 4 dashes. The next digit to be entered flashes. After all 5 digits are entered, the first digit flashes again. In this state the code number can be written over repeatedly. A correction can be made only by reentering the entire code number.
Confirming the code number: Press seek-UP/seek-DOWN or SCAN button. The radio switches on automatically and displays the station or frequency stored for station button 1.
If the wrong code number has been entered and confirmed, the word "CODE" appears on the display again. After the code has been entered three times incorrectly the word "WAIT" appears on the display and the radio is disabled for approx. 10 min .
NOTE: The waiting time continues to run only when the radio is switched on.
After expiration of the waiting time the word "CODE" appears on the display again and the correct code number can be entered. After 3 more incorrect entries the radio is again disabled for 10 min . After 3 more incorrect entries (a total of 9 incorrect entries) the waiting time is increased to 60 min . After 3 more incorrect entries the radio locks up again for 60 min . Certified Auto Service Repair for Audi BMW Greensboro Jaguar Land Rover...