1993 Cadillac Deville Sedan Car Radio Wiring Guide Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger Wire: Pink
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 4″ x 6″
Car Audio Front Speakers Location: Dash
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: 6″ x 9″
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue
Taken from http://www.modifiedlife.com/1993-Cadillac-deville-sedan-car-radio-wiring-guide/
And yes I know there are two other wires, I don't know where they go, but they are not needed in a new system as far as I know. Also, the dimmer wire may not be brown, but may not matter as most aftermarket systems don't use it anyway.
You can go to a local autozone and use their haynes manual. In the back of the manual you will see in fine print underneath the correct diagram, stereo wiring diagram.
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