When using as a stereo interface, it's not playing loudly

It's not the receiver, it's the interface. If you recently had this unit installed with a door chime or, some other type of LAN data interface to replace the door chimes, the adjustment is off. The interface/door chime needs to accessed to turn the volume down.
The interface is neccessary because when you remove the factory stereo from a newer GM vehicle you lose the door chimes, accessory 12 volt power source, ON Star, etc. The LAN data interface replaces these features when adding an aftermarket stereo.

the interface will probably only work with the phillips software, but many of those stereos support playing from a flash drive.

If there is no auxiliary port on the front of the stereo, then you will have to try and find an iPod interface cable that you can wire into the factory stereo. You can use the FM modulator type of iPod adapters, but the sound isn't as good as when it is hard wired. You can look for the iPod interface kits online at a lot of car audio stores. Try www.sonicelectronix.com
Hope this helps. Good luck!

the changer plays through the fm on the radio, you need to find out what station it is tuned to. should be between 88 and 95 or so. you could just try seeking until the changer is picked up.

SEEMS LIKE YOU ARE TRYING TO PLUG INTO THE HEADPHONES JACK AT THE FRONT ! NO GOOD . YOU NEED TO HAVE STEREO ON. AND USE AUX. TO DO THIS pLUG IN YOUR MP3 PLAYER WITH 3.5 STEREO JACK OTHER END BACK OF STEREO INTO AUX. RED AND WHITE RCA PLUGS.
THIS LEAD COSTS LESS THAN $7.00 AND THE SOUND IS VERY LOUD THEN. !
I DID IT MYSELF AND AM HAPPY WITH IT .

It will fit, but the parts are expensive and it is not plug and play.

Parts needed:

Dash kit- Metra 99-3305 About $15-$20

Antenna adapter- Metra 40-CR10 (Chrysler antenna adapter) Yes GM uses Chrysler parts. About $10-$15

Wire harness/Interface- GMOS-LAN-01 (non bose or onstar) About $100
GMOS-LAN-02 (bose/onstar) About $120

The reason for the pricey harness is to retain data features on the vehicle and to interface with Onstar (GMOS02).

This is the right way so don't cut corners because it can cause issues on your brand new vehicle.

All of your safety chimes run through the stereo and not using the correct interface can cause issues with your gauges

www.metraonline.com or www.scosche.com are good sources for install parts info

where did you plug this behind the radio ? or at the cd changer cable ?, the interface needs to be plug into the radio not the cd changer cable

you need an upscaler for the vision sound will be dolby stereo 2

i have alpine stereo's in all my vehicles and i have had this problem. if you run a 10-14 gauge constant wire from the stereo directly to the battery the stereo will not shut down in protection mode. it is not the cd it is the stereo going into protection mode because of lack of current not voltage. i hope this helps after i did this i could play the stereo as loud as it can go until my battery died

That particular stereo system have self powered speakers. The speakers amplify themselves. You may have one of the speakers amp go out.