What are the brown wires in the stereo wiring harness?

In a stereo wiring harness, brown wires are typically used for the illumination or dimming of the stereo display, allowing the brightness to adjust based on the vehicle's lighting conditions. They may also be used for other functions depending on the specific wiring setup of the vehicle. Always refer to the vehicle's manual or the stereo's installation guide for precise information related to the wiring harness.