Where is brake light relay on Volvo 850?

In the Volvo 850, the brake light relay is typically located in the central electronics module (CEM), which is situated under the dashboard on the driver's side. You may need to remove the plastic cover beneath the steering column to access it. Additionally, the brake light switch itself, which can also affect brake light operation, is located above the brake pedal. Always consult the vehicle's service manual for precise locations and diagrams.