1993 Honda Civic Stereo Wiring
Constant 12V+ ---White/Blue
Switched 12V+ ---Yellow/Red
Ground ---Black
Illumination ---Red/Black
Dimmer ---n/a
Antenna ---Driver's Pillar
Front Speakers ---6 1/2" Doors
Left Front (+) ---Blue/Green
Left Front (-) ---Gray/Black
Right Front (+) ---Red/Green
Right Front (-) ---Brown/Black
Rear Speakers ---5 1/4" Rear Deck
Left Rear (+) ---Blue/Yellow
Left Rear (-) ---Gray/White
Right Rear (+) ---Red/Yellow
Right Rear (-) ---Brown/White

You should have all these wires, if not there is something missing you need to find.