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you need to buy the wiring harness that is for your car then you can just hook the harness to your deck and plug it in to the car,unless your wires in your dash are all cut up,in that case you need a tester light.ground the light on somthing and look for the wire that lights up when the car is turned off,this is your battery back-up it goes to yellow on the deck,next look for a wire that has power with your ihgnition and loses power when ignition is off,this one goes to the red on the deck,look for a ground they are usually black but test it for power cause that would blow your fuse,or make your own by drilling a hole somewhere in the chassis and attach to black wire on deck,as for speakers you will prob need to remove front speakers,look at the colors and these are the same as colors youll see where deck is,then check back speaker wire colorwhich also runs to your dash
Im guessing you have an amplifier if not check the cd player ground " AMP GRD" means amp ground is faulty. In the event that you do have an amplifier check that ground wire as it's most likely the problem.
the message you are getting is "amp guard". This is the mesage it will display when a short in a speaker wire or speaker with low impedence is hooked to the internal amp and sends it into protect mode, shutting down the amplifier section while the rest of the unit continues to work.
Check your Factory speaker locations for blown speakers or bare wires to metal.