I have a mercedes ML 2002 model. I recently changed the battery and the radio is asking me for a code. i got the code from www.radio-code.com (code: 23515) but my radio only has numbers 1 to 4 so i cannot enter the number 5. Do you know if this is the correct code and if so can you tell me how to enter the number 5 (i tried all buttons).My car number is WDC1631541A348416