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From the Hayes "Cadillac CTS and CTS-V '03 thru '12" manual (the writers state that their collection of wiring diagrams is not complete and only includes the diagrams that they believe are most often needed):
-- Hayes Manual pg. 12-45: License plate lamps: purple wire from left position lamp circuit, rear fuse block mini-fuse 15 (10A). Pulling this fuse should disable license plate lamps, left-side front parking and side marker lamp, left-side tail lamp, and left-side brake and turn signal lamp.
-- Hayes Manual pg. 12-61: Trunk light: called rear compartment courtesy lamp, powered by orange wire from Body Control Module, which is powered by underhood fuse block Body Control Module 2 mini-fuse 36 (15A), and underhood fuse block Body Control Module 7 mini-fuse 69 (10A). Pulling these fuses should disable all courtesy lights (with the possible exception of front door lamps), reading lamps, sunshade lamps, and trunk latch.
Be careful. Check that the circuits are dead after you pull the fuses. The after-market manuals often have mistakes, especially presenting information from the wrong year car. Hopefully computers will not be damaged.
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