On this website you find fuse box diagram and description for Cadillac CTS (2008)
https://www.carknowledge.info/cadillac-cts-2008-fuse-box-diagram
SOURCE: My brake lights went out
If all the brake light went out at the same time, then i would look at the brake switch. this is located along the brake pedal somewhere. remove it and play with it and see if will get them going again. if you do get the lights to start working, replace the switch. good luck.
SOURCE: have a 2008 cadillac cts. i have no low beams only
Most common cause is bad dimmer switch (lever used to flip between hi/lo beams) very common problem - plastic parts
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