How do you replace a brake light switch on 2007 Cadillac CTS?

To replace the brake light switch on a 2007 Cadillac CTS, first disconnect the negative battery terminal to ensure safety. Locate the brake light switch, which is typically found above the brake pedal. Remove the wiring harness from the switch and then unbolt or unclip the switch from its mounting position. Install the new switch by reversing the removal process, reattach the wiring, and reconnect the battery before testing the brake lights.