Where is the brake light switch located on 2003 Oldsmobile Alero?

The brake light switch on a 2003 Oldsmobile Alero is located on the brake pedal assembly itself. It's a small cylindrical switch, usually near the top of the brake pedal, where the pedal connects to the brake mechanism. You'll likely need to look up under the dash, above the brake pedal, to locate it. It's often accessed from under the dashboard, requiring some maneuvering and possibly removal of some plastic trim pieces for easier access.