Brake Switch

WARNING: This page is about a different car, the 2018 Ford Fiesta. However, it is still accessible from the selected car via links, so may be relevant.

The stoplamp switch and the cruise control deactivator switch are electrical inputs controlling the cruise control system. The stoplamp switch is a normally open switch that is hard-wired to the PCM. When the brake pedal is applied, the switch closes and applies a voltage signal to the PCM, deactivating the cruise control. The cruise control deactivator switch is a normally closed switch that is hard-wired to the IPC. When the brake pedal is applied, the switch opens and removes ground signal from the IPC. The IPC sends a HS-CAN message to the PCM to signal the brake pedal is applied. The PCM compares the inputs from the stoplamp switch and the cruise control deactivator switch. If a deviation occurs, the PCM sets a DTC and the cruise control system is deactivated.