Installed Double Din car stereo in 2009 Jeep Liberty Limited and get no sound

Help! installing a double din car stereo in wife's '09 Jeep Liberty and it all turns on, but no sound from radio. Will play a USB stick but still no sound.
Already had an aftermarket JVC radio that worked fine but now when I wire the old radio in still no sound. There is a Stinger radio adapter also was wired in. The +12v accessory red wire from the adapter is wired to the new radio which turns on the radio when the ignition is switched on. That is the only wire from the adapter I hooked up. On the radio side there is the key 1, key 2, ant, illumination and back wire left unused. The only wire labeled on the adapter was the +12v accessory wire. The radio comes on okay, but I get no sound emitted. Anybody got any ideas on which wire to attach key1 & key 2 from the radio to the Stinger adapter? Thanks for your help. There was no steering wheel wheel module installed in the vehicle.
Thanks for any suggestions.

FYI-I figured it out. I stripped the ends of the additional wires, turned on the device and touched the key 1 and key two wires and Walla! Sound! The wire marked key2 connected to blue wire with white stripe turned on a switch in the device I suppose. Now I got to wire the backup camera.