Exterior Lighting

WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

The headlamp switch is integrated into the Front Lighting Control Module (FLM). The FLM monitors the headlamp switch position and sends a message over the High Speed Controller Area Network (HS-CAN) to the Body Control Module (BCM) to indicate the headlamp switch status (position or a fault with the headlamp switch).

If the BCM detects a fault from the headlamp switch or loses communication with the FLM , the BCM turns the parking lamps and headlamps on and keeps them on until the battery saver feature times out.

Refer to EXTERIOR LIGHTING for information regarding the battery saver feature.

If either situation occurs, the BCM cannot be ruled immediately as being at fault. This is normal behavior of the BCM design as a fault has been detected with the inputs from the headlamp switch.

When the BCM receives input requesting the headlamps on, it supplies voltage to the headlamp bulbs (halogen headlamps) or the ballasts (High Intensity Discharge (HID)) within each headlamp assembly.