No sound output from my Alpine cda-d852 in ...

I just installed an Alpine CDA-D852 into my 92 toyota camry (hard wired not factory plug in connectors). after connections were made according to the diagram on the back of the receiver it has no sound. The equalizer on the face plate of the unit is bouncing just like it should while playing but no output. The receiver worked fine in my old toyota truck. Are the speaker connections special or different than just + and -? Your help is appreciated. Could there be a connection I have missed that would let the stereo appear to work but have no output?