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Free wiring diagrams here http://www.bbbind.com/free_tsb.html
Enter the vehicle info. then under system click on lighting , under subsystem click on exterior lighting . Click the search button , then on the blue link's one at a time !
You may have a bcm problem? The bcm controls both the brakes and turn signals. Any applicable trouble codes? Click on the link, part of wiring for brake lamps, you can check the fuse and relay. Also, check the fuse circuit for voltage, use a test light.
Use a voltmeter and see which wires in the loom show power when (1) tail lights are on, (2) brake lights are on, (3) each turn signal is on, and (4) which shows continuity with vehicle ground/earth. Match these up with the appropriate wires in the trailer harness.
If your brake lights and turn signals are the same bulb on the towing vehicle, you're all set. If they are different bulbs, you'll need an adapter to get both brake lights and turn signals to work on the trailer.
The brake light switch, located on the brake padal assembly, is and input to the cruise control module. When the switch fails keeping the lights on is makes the cruise control module think you are applying the brakes when infact you are not. Chek the switch wiring for damage and if ok replace the switch making sure you adjust it properly.
I have the same problem, found that when it rains heavy or I wash the Saturn Sky; water runs down over the computer under the hood on the driverside. There is a drain port just above the computer so water runs down through the drain port onto the computer wiring shorting out this computer, when the wiring dries out the electrical problems are fixed. but the water can do damage to the computer which comtrols the radio and many other electronics inthe Saturn Sky. I know this because this happened to me. after washing my Sky all the electronics went crazy, found the water on my computer wiring. after a couple of times of the wiring shorting out the radio started comming on by its self while the car was shut off causing the battery to die over night. What a crazy place to put a drain port over top of a computer and its wiring. A cover needs to be made and placed over the top of the computer to prevent this from happening again. If you are having a problem getting GM to fix the problem; wash the car using a garden hose and let alot of water run down over the window on the driverside so the water can run down the water port under the hood onto the computer and wiring, this should create the same problem then take it back to the GM dealer and show them the water problem. They can then refuse to correct the problem. Good Luck. O yes one other problem you need to know about, if you don't have mud flaps on the front wheels the paint will chip real bad on the rear lower quater pannels and it will cost you a good dollar to have it repainted.
I had the same problem, the brake light circuit runs through the column and through the turn signal switch and the contacts are most likelycorroded. You will have to take the steering wheel off but be sure to disconnect the battery and let the car sit for 5min before taking the air bag out. Once you get the steering wheel off you will take the screws out of the signal switch assembly, once done you will see two torks screws holding the switch cover on inside are the contacts. Clean the contacts with emory clothe and contact cleaner. The Cutlass series are notorious for this problem, you will need a friend to put the steering wheel locking plate back on because of the heavy spring load. I hope this fixes anybody with the same problem.