Okay, your radio is an Alpine model CM5901J. You have a couple of options:-
1. Call your dealer and see if they will look up the code on their database for your car, or
2. Use an online radio code recovery service to recover the code from the model and serial number. (They usually charge around $20).
3. Try posting an inquiry on the ecoustics dot com forums - a member may take pity on you and give you the code.
I have some radio code recovery software, but unfortunately the only ones I have for Alpine radios are for Mercedes vehicles or from reading the placement of links on the circuit board of a different model to yours (which I have never tried).
The code should be a 5 or 6 digit number - it may have been written somewhere in the original owners handbook, written on a sticker on the inside of your glove compartment or pencilled onto the outside of the radio case if it has been removed previously.
Sorry I cannot help you further.
Last edited by David Mc; 01-30-2014 at 04:00 PM.