High Beams

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

The SCCM monitors the LH steering column multifunction switch for a high beam request. When the LH steering column 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 ignition is in ON, the BCM supplies voltage to the LED control module attached to each headlamp assembly through the high beam headlamp circuit. This LED control module is used to control the high beam LED.

When the BCM receives a message requesting the high beams, it sends a high beam message over the HS-CAN1 to the HCM. The HCM sends the high beam message over the LIN circuit to the LED control module attached to each headlamp assembly to illuminate the high beam LED in addition to the low beam LED. This changes the headlamp beam brightness 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 .