Installed head unit - Tuner works fine, but no sound for CD player or AUX??

Are you running a 4 channel amp for all of your highs...or do you have a factory amplified system that needs to have the internal ampifier to play music....basically what it sounds like to me is that you attached the blue wire from the new players harness to the amp turn on and not the blue/white wire. The strait blue wire is power antenna and will shoot 12v when your listening to the FM radio, that 12v will turn your amps on...but only for radio, you need remote turn on (blue/white) which sends 12v when the headunit comes on...giving you sweet sound on any source....this might not be it, but seen it to many times

What kind of vehicle is it? and year

Does it have the premium sound system from the factory?

i agree you likely used the blue wire for factory amp turn-on and should have used the blue/white wire. the factory amp should be under the driver's seat.

this car requires a GMOS adapter for the Class II Data Bus. I assume you installed one?

^^^

no no, you want the blue/white from the sony connected to the amp turn on wire in the harness. do not connect the blue wire from the Sony - blue is power antenna. blue/white is amp turn-on. blue only has voltage when the radio is selected. blue/white has voltage whenever the head unit is on.

thanks for coming and asking the question, we're glad to help. luckily for us, it's a common problem. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Haha bud I wouldnt have known that if I hadn't done it once myself