You can find a wiring diagram for a 93 Saturn in the vehicle's owner's manual. You can also check with local auto part stores.
Pick up a Haynes repair manual for the vehicle. They have wiring schematics in them.
Here's the one I used http://carstereohelp.net/wireharness_Delco3.htm
Get Haynes Repair Manual for the Saturn S-series 1991 thru 2002 (Haynes series 87010) available at Advance Auto Parts and other auto parts stores. It has wiring diagrams in the back.
are you sure the pioneer isn't after market? if it is here is the Saturn sl wiring diagram
saturnfans.com
where can i get a free electric fuel pump wiring diagram for a 1997 Saturn swi
You can get the wiring diagram in the Haynes Manual for 2002-2007 Saturn Vue at any parts store that sells Haynes. Price $19.99
1993 Saturn sl2
When working on a car it is important to have a visual aid to help. A maintenance manual to this car will have a wiring diagram.
See the Related Links for "radio diagram" to the left for the answer.
You have a short somewhere. Find what the fuse is for and check/replace the wiring
try looking for a wiring diagram