High Beams
WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.
The SCCM monitors the high beam button for a high beam request. When the LH steering column multifunction switch is pushed, the SCCM sends a message over the HS-CAN2 to the GWM, then the GWM sends the message to the BCM over the HS-CAN1.
When the low beams are on and the BCM receives a request for high beams, the low beam bulbs remain illuminated and the high beam bulbs are also illuminated. This changes the headlamp beam pattern to illuminate a greater distance.
The BCM also provides Field Effect Transistor (FET) protection of the high beam output circuits. When an excessive current draw is detected, the BCM disables the affected circuit driver. Refer to: Module Controlled Functions - System Operation and Component Description .