High Beams

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

The SCCM monitors the LH multifunction switch for a high beam request. When the LH multifunction switch is in the HIGH BEAMS position, 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 High Intensity Discharge (HID) bulbs remains powered on and the shutter within each headlamp are activated. This changes the headlamp beam pattern to illuminate a greater distance.

The BCM supplies a high current switched voltage to the headlamp assemblies to supply the necessary current to operate the high beam shutters. The BCM provides a low current voltage signal to the headlamp assemblies to activate the high beam shutters.

The BCM also provides an Field Effect Transistor (FET) protection of the exterior lamps switched voltage and 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 .