Cdx-f5710 my cdx-fx5710 turns on and plays cds, but my buttons wont work.

SOURCE: want to use ipod on cdx-f5710, how to fix it

use the aux lite input on the rear of the reciever. If it is a 3.5mm plug, you will need an extension with both ends male. One end in the aux port, on your head unit, the other end in the headphone jack of the ipod.
If it is RCA Aux lite, you need an rca-to-3.5mm adapter. Either item should be relatively cheap. $4-$5 USD

SOURCE: SONY CDX-F5710

http://esupport.sony.com/US/perl/model-documents.pl?mdl=CDXF5710&region_id=1

Download the manual from here

SOURCE: whats the wire colors for a sony cdx-f5710

Sony head units use either a 9 pin connection or a 16 pin connection. Here is a link to both, respectfully.
http://www.kb.sony.com/selfservice/documentLink.do?externalId=C285614
http://www.kb.sony.com/selfservice/documentLink.do?externalId=C217600
And here are the installation instructions for your CDX-F5710.
http://www.docs.sony.com/release/CDXF5710install.pdf
And finally, your operating instructions.
http://www.docs.sony.com/release/CDXF5710.pdf

SOURCE: what are the light blue

Looking at the installation guide, I do not see a pink wire. The light blue one looks like it is for the antenna.

See the installation manual here:

http://www.docs.sony.com/release/CDXF5710install.pdf