High Beam and Flash-to-Pass
WARNING: This page is about a different car, the 2012 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
The SCCM monitors the multifunction switch for a flash-to-pass and high beam request. When the multifunction switch is in the FLASH-TO-PASS or HIGH BEAM position, the SCCM sends a message to the BCM to indicate the request.
When the BCM receives a request for high beams (the low beams must be on), the BCM supplies voltage to the high beams.
When the flash-to-pass is requested, the high beams are illuminated as long as the multifunction switch is held in the FLASH-TO-PASS position (regardless if the low beams are on or off).