Brake pedal
WARNING: This page is about a different car, the 2006 Volvo S80 and 2005 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
The value indicates the status of the brake light switch. The engine control module (ECM) sends a signal on the controller area network (CAN) about the position of the brake light switch: activated or not activated.
Active = Stop lamp switch on.
Not active = Stop lamp switch off.